Patent Description:
With development of communications technologies and electronic devices, especially with a fifth-generation mobile communications technology (<NUM>) era coming, electronic devices need to support more antennas and frequency bands, to implement a high transmission rate required by <NUM>. For example, a multiple-input multiple-output (multiple-input multiple-output, MIMO) technology is used in an electronic device, and a space diversity gain can effectively improve channel reliability, to reduce a channel bit error rate, and finally increase a data rate. However, in a MIMO antenna structure, a quantity of antennas is in direct proportion to space occupied by the antennas. Therefore, excessively-limited space inside the electronic device limits both a frequency band that can be covered and performance of a MIMO antenna. <CIT> discloses a MIMO antenna comprising two grounded L-shaped radiating elements disposed at the edge of a printed circuit board and parasitic elements, wherein the parasitic elements are not disposed on the printed circuit board.

To resolve the foregoing problem, in the conventional technology, two different antenna modes can be excited on a same antenna, to form dual antennas with a specific isolation. However, each antenna mode can cover only one frequency band, and consequently, a bandwidth of the foregoing antenna is limited.

Embodiments of this application provide an antenna apparatus and an electronic device, to resolve a problem that an antenna bandwidth is limited because a small quantity of excitation modes are generated when an antenna is excited by one excitation end.

To achieve the foregoing objective, this application uses the following technical solutions.

According to one aspect of embodiments of this application, an antenna apparatus is provided. The antenna apparatus includes a circuit board and an antenna body. The circuit board includes a first surface and a first side edge. The antenna body includes a first radiator and a second radiator. The first radiator includes a first stub and a second stub. A first end of the first stub and a first end of the second stub are opposite to, but do not touch each other, and a first gap is configured between the first end of the first stub and the first end of the second stub. The first stub and the second stub are located on the first side edge of the circuit board. A second gap is configured between the first stub and the first side edge of the circuit board, and the second gap is configured between the second stub and the first side edge. The second radiator is located on the circuit board, a third gap is configured between the second radiator and the first surface of the circuit board, and a vertical projection of the second radiator is located on the first surface of the circuit board. A second end of the first stub and a second end of the second stub are electrically connected to reference ground of the circuit board separately. The first radiator is indirectly coupled to the second radiator. Because the first radiator and the second radiator are indirectly coupled, when one excitation end is used to excite the first radiator to generate one radiation mode, a current generated on the first radiator may be coupled to the second radiator, so that the second radiator can generate another radiation mode. In this way, a same excitation end may excite the antenna body to generate two radiation modes. In this case, when a quantity of excitation ends is increased, a quantity of radiation modes is also increased. Therefore, compared with a solution in which only two different antenna modes can be excited on a same antenna, the solution provided in this embodiment of this application can help the antenna body obtain a wider bandwidth.

Optionally, there is a distance D between the first radiator and the second radiator, where D ≤ <NUM>. In this way, the distance between the first radiator and the second radiator is short, so that a current on the first radiator can be easily coupled to the second radiator.

Optionally, the antenna apparatus further includes a first feed circuit and a second feed circuit. The first feed circuit is electrically connected to the first stub and the second stub. The first feed circuit is configured to: transmit equal-amplitude out-of-phase excitation signals to the first stub and the second stub respectively, and excite the antenna body as a first antenna to generate a first radiation mode and a second radiation mode. A main radiator in the first radiation mode is the first radiator. A main radiator in the second radiation mode is the second radiator. The second feed circuit is electrically connected to the first stub and the second stub. The second feed circuit is configured to: transmit a same excitation signal to the first stub and the second stub, and excite the antenna body as a second antenna to generate a third radiation mode. A main radiator in the third radiation mode is the first radiator. In conclusion, in the antenna structure provided in this embodiment of this application, the first feed circuit can excite the antenna body as the first antenna to generate the first radiation mode and the second radiation mode. In addition, the second feed circuit can excite the antenna body as the second antenna to generate the third radiation mode, to form dual antennas. In this way, the antenna body may simultaneously work in at least three radiation modes as dual antennas, to transmit more data. Therefore, compared with a solution in which only two different antenna modes can be excited on a same antenna, the solution provided in this embodiment of this application can help the antenna body obtain a wider bandwidth.

Optionally, the circuit board includes a first excitation end. The first feed circuit includes a signal conversion circuit and a first configuration circuit. The signal conversion circuit has an input end, a first output end, and a second output end. The input end is electrically connected to the first excitation end, the first output end is electrically connected to the first stub, and the second output end is electrically connected to the second stub. The signal conversion circuit is configured to: convert a signal provided by the first excitation end into a first excitation signal and a second excitation signal that are equal-amplitude out-of-phase, transmit the first excitation signal to the first stub through the first output end, and transmit the second excitation signal to the second stub through the second output end. The signal conversion circuit may be a balun chip. The balun chip has a small packaging size, in the antenna structure, so that a single-end signal provided by the first excitation end can be converted into two equal-amplitude out-of-phase signals by using the balun chip with a small packaging size, and a size of the antenna structure can be reduced. In addition, a first output end and a second output end of the balun chip have a high balance degree, so that the first excitation signal and the second excitation signal can meet an equal-amplitude out-of-phase requirement, to effectively excite the antenna body to generate the first radiation mode and the second radiation mode. In addition, a first configuration circuit is electrically connected between the first output end and the second output end of the signal conversion circuit, and configured to tune a resonance frequency and a bandwidth of the first radiator in the first radiation mode, so that a resonance frequency and a bandwidth of the antenna body can be tuned based on a requirement.

Optionally, the first configuration circuit includes a first capacitor and a second capacitor. A first end of the first capacitor is electrically connected to the first output end of the signal conversion circuit, and a second end of the first capacitor is electrically connected to the first stub. A first end of the second capacitor is electrically connected to the second output end of the signal conversion circuit, and a second end of the second capacitor is electrically connected to the second stub. The first capacitor and the second capacitor are configured to perform feeding matching. When capacitance values of the first capacitor and the second capacitor are larger, a resonance frequency of the antenna body is lower when the first feed circuit excites the antenna body to generate the first radiation mode; or when capacitance values of the first capacitor and the second capacitor are smaller, a resonance frequency of the antenna body is higher.

Optionally, the first configuration circuit further includes at least two first tuning components. The first tuning component is electrically connected between a second end of the first capacitor (or the first stub) and a second end of the second capacitor (or the second stub). The first tuning component includes a first inductor and a first radio frequency switch that are connected in series. In this way, a quantity of first inductors connected in parallel in the first configuration circuit may be controlled by controlling a quantity of first radio frequency switches. When the quantity of first inductors connected in parallel in the first configuration circuit is larger, inductive reactance between the first stub and the second stub is lower, and a resonance frequency of the antenna body in the first radiation mode is higher; or when the quantity of first inductors connected in parallel in the first configuration circuit is smaller, inductive reactance between the first stub and the second stub is higher, and a resonance frequency of the antenna body in the first radiation mode is lower.

Optionally, the antenna apparatus further includes a second configuration circuit. The second configuration circuit is electrically connected to a center of the second radiator and the reference ground of the circuit board, the second feed circuit is further configured to excite the antenna body to generate a fourth radiation mode, and a main radiator in the fourth radiation mode is the second radiator. The second configuration circuit is configured to tune a resonance frequency and bandwidth of the second radiator in the fourth radiation mode. The second configuration circuit includes at least two second tuning components. The second tuning component is electrically connected between the center of the second radiator and the reference ground of the circuit board. Each second tuning component includes a second inductor and a second radio frequency switch that are connected in series. In this way, a quantity of second inductors connected in parallel in the second configuration circuit may be controlled by controlling a quantity of second radio frequency switches. When the quantity of second inductors connected in parallel in the second configuration circuit is larger, inductive reactance between the second radiator and the reference ground of the PCB is lower, and the resonance frequency of the antenna body in the fourth radiation mode is higher; or when the quantity of second inductors connected in parallel in the second configuration circuit is smaller, inductive reactance between the second radiator and the reference ground of the PCB is higher, and the resonance frequency of the antenna body in the fourth radiation mode is lower.

Optionally, the first configuration circuit includes a third capacitor and a fourth capacitor. A first end of the third capacitor is electrically connected to the first output end of the signal conversion circuit, and a second end of the third capacitor is electrically connected to the first stub. A first end of the fourth capacitor is electrically connected to the second output end of the signal conversion circuit, and a second end of the fourth capacitor is electrically connected to the second stub. When capacitance values of the third capacitor and the fourth capacitor are higher, the resonance frequency of the antenna body in the first radiation mode is lower; or when capacitance values of the third capacitor and the fourth capacitor are smaller, the resonance frequency of the antenna body in the first radiation mode is higher.

Optionally, the antenna apparatus further includes a second configuration circuit. The second configuration circuit is electrically connected to the center of the second radiator and the reference ground of the circuit board, the second feed circuit is further configured to excite the antenna body to generate a fourth radiation mode, and a main radiator in the fourth radiation mode is the second radiator. The second configuration circuit is configured to tune a resonance frequency and a bandwidth of the second radiator in the fourth radiation mode. The second configuration circuit includes a fifth capacitor and/or a third inductor. A first end of the fifth capacitor is electrically connected to the center of the second radiator, and a second end of the fifth capacitor is grounded to the reference ground of the circuit board. A first end of the third inductor is electrically connected to the center of the second radiator, and a second end of the third inductor is grounded to the reference ground of the circuit board. In a case the antenna body works in the fourth radiation mode, when a capacitance value of the fifth capacitor or an inductance value of the third inductor is larger, the resonance frequency of the antenna body in the fourth radiation mode is lower; or when a capacitance value of the fifth capacitor or an inductance value of the third inductor is smaller, the resonance frequency of the antenna body in the fourth radiation mode is higher.

Optionally, the first stub and the second stub are both L-shaped, and the first stub and the second stub are disposed symmetrically with respect to a center of the first gap. In this case, when the antenna body is in the third radiation mode, in the first radiator that is used as a main radiator, a current distributed on the first stub and a current distributed on the second stub have flow directions opposite to each other, and are symmetrically distributed with respect to the center of the first gap. This helps improve isolation of dual antennas.

Optionally, the second radiator is strip-shaped, and the first stub and the second stub are symmetrically disposed with respect to the center of the second radiator. This helps improve isolation of dual antennas.

Optionally, a current on the antenna body in the first radiation mode is orthogonal to currents on the antenna body in the third radiation mode and the fourth radiation mode; and a radio wave on the antenna body in the first radiation mode is orthogonal to radio waves on the antenna body in the third radiation mode and the fourth radiation mode. Therefore, isolation between an antenna in the first radiation mode and an antenna in the third radiation mode and the fourth radiation mode is high. A current on the antenna body in the second radiation mode is orthogonal to currents on the antenna body in the third radiation mode and the fourth radiation mode; and a radio wave on the antenna body in the second radiation mode is orthogonal to radio waves on the antenna body in the third radiation mode and the fourth radiation mode. Therefore, isolation between an antenna in the second radiation mode and an antenna in the third radiation mode and the fourth radiation mode is high.

Optionally, in the first radiation mode, a flow direction of a current distributed on the first stub is the same as a flow direction of a current distributed on the second stub. In the second radiation mode, flow directions of currents distributed on the second radiator are the same. In the third radiation mode, a flow direction of a current distributed on the first stub is opposite to a flow direction of a current distributed on the second stub relative to the first gap. In the fourth radiation mode, flow directions of currents distributed on the second radiator are opposite to each other relative to the center of the second radiator. Therefore, isolation between the first antenna in the first radiation mode and the second antenna in the third radiation mode and the fourth radiation mode is high. In addition, isolation between the first antenna in the second radiation mode and the second antenna in the third radiation mode and the fourth radiation mode is high, so that dual antennas with high isolation are formed.

Optionally, a frequency range covered by the first radiation mode, a frequency range covered by the second radiation mode, a frequency range covered by the third radiation mode, and a frequency range covered by the fourth radiation mode are at least partially different from each other. In this way, when the antenna body works in the four radiation modes at the same time, because frequency ranges covered by the four radiation modes may be different, the antenna body can obtain a wider bandwidth, to transmit more data.

Optionally, the antenna apparatus further includes an antenna chassis. The antenna chassis is disposed on the first surface of the circuit board. A height of the antenna chassis is the same as the third gap. The second radiator is disposed on a surface of a side that is of the antenna chassis and that is away from the first surface of the circuit board. A height direction of the antenna chassis is perpendicular to the first surface of the circuit board. A material of the antenna chassis includes an insulation material. The antenna chassis is configured to support the second radiator, so that the third gap is configured between the second radiator and the PCB.

According to another aspect of embodiments of this application, an electronic device is provided, including a metal rim and any antenna apparatus described above. The first radiator of the antenna apparatus is a part of the metal rim. The electronic device has a same technical effect as the antenna apparatus provided in the foregoing embodiment.

<NUM>-Electronic device; <NUM>-Display module; <NUM>-Middle frame; <NUM>-Metal rim; <NUM>-Bearing plate; <NUM>-PCB; <NUM>-Back cover; <NUM>-First radiator; <NUM>-First stub; <NUM>-Second stub; <NUM>-Second radiator; <NUM>-Antenna body; <NUM>-First feed circuit; <NUM>-Second feed circuit; <NUM>-Antenna chassis; <NUM>-Second configuration circuit; <NUM>-Signal conversion circuit; <NUM>-First configuration circuit; <NUM>-First tuning component; and <NUM>-Second tuning component.

The following describes the technical solutions in embodiments of this application with reference to the accompanying drawings in embodiments of this application. It is clear that the described embodiments are merely a part rather than all of embodiments of this application.

The following terms "first" and "second" are merely intended for a purpose of description, and shall not be understood as an indication or implication of relative importance or an implicit indication of a quantity of indicated technical features. Therefore, a feature limited by "first" or "second" may explicitly or implicitly include one or more of the features. In the descriptions of this application, unless otherwise stated, "a plurality of" means two or more than two.

In addition, in embodiments of this application, orientation terms such as "upper", "lower", "left", and "right" may be defined by, but are not limited to, orientations of components schematically placed in the accompanying drawings. It should be understood that these orientation terms may be relative concepts, are used for description and clarification of "relative to", and may be changed correspondingly based on changes in placement orientations of the components in the accompanying drawings.

In this application, it should be noted that the term "connection" should be understood in a broad sense unless otherwise expressly specified and limited. For example, the "connection" may be a fixed connection, may be a detachable connection, may be an integral connection; may be a direct connection, or may be an indirect connection implemented by using a medium. In addition, the term "electrical connection" may be a direct electrical connection, or may be an indirect electrical connection implemented by using a medium.

An embodiment of this application provides an electronic device. The electronic device may be applied to various communications systems or communications protocols, such as a global system for mobile communications (global system for mobile communications, GSM), a code division multiple access (code division multiple access, CDMA) system, a wideband code division multiple access (wideband code division multiple access, WCDMA), a general packet radio service (general packet radio service, GPRS), and long term evolution (long term evolution, LTE). The electronic device may include an electronic product that has a wireless signal receiving and sending function, such as a mobile phone (mobile phone), a tablet computer (pad), a television, an intelligent wearable product (for example, a smartwatch or a smart band), an internet of things (internet of things, IOT), a virtual reality (virtual reality, VR) terminal device, an augmented reality (augmented reality AR) terminal device, and an unmanned aerial vehicle. A specific form of the electronic device is not particularly limited in this embodiment of this application.

As shown in <FIG>, when the electronic device <NUM> has a display function, the electronic device <NUM> may include a display module <NUM>. The display module <NUM> includes a liquid crystal display (liquid crystal display, LCD) module and a back light unit (back light unit, BLU). Alternatively, in some other embodiments of this application, the display module <NUM> may be an organic light-emitting diode (organic light-emitting diode, OLED) display.

In addition, the electronic device <NUM> may further include a middle frame <NUM> and a back cover <NUM>. The middle frame <NUM> includes a bearing plate <NUM> and a metal rim <NUM> that wraps around the bearing plate <NUM>. Electronic components such as a printed circuit board (printed circuit board, PCB) <NUM>, a camera, and a battery may be disposed on a surface that is of the bearing plate <NUM> and that faces the back cover <NUM>. The camera and the battery are not shown in the figure. The back cover <NUM> is connected to the middle frame <NUM> to form an accommodating cavity configured to accommodate the electronic components such as the PCB <NUM>, the camera, and the battery. This can avoid impact on performance of the electronic device because of entering of water vapor and dust into the accommodating cavity.

The electronic device <NUM> further includes an antenna apparatus <NUM> shown in <FIG> used for communication. The antenna apparatus <NUM> may include an antenna body <NUM> configured to transmit an electromagnetic wave and receive an electromagnetic wave. The antenna body <NUM> includes a first radiator <NUM> and a second radiator <NUM>. The first radiator <NUM> includes a first stub <NUM> and a second stub <NUM>. The first stub <NUM> has a first end A1 and a second end A2. The second stub <NUM> has a first end B1 and a second end B2. The first end A1 of the first stub <NUM> and the first end B1 of the second stub <NUM> are opposite to, but do not touch each other. A first gap H1 is configured between the first end A1 of the first stub <NUM> and the first end B1 of the second stub <NUM>. The second end A2 of the first stub <NUM> and the second end B2 of the second stub <NUM> are electrically connected to reference ground GND of the PCB <NUM> separately.

The PCB <NUM> includes a first surface P1 and a first side edge P2. The first surface P1 of the PCB <NUM> faces the housing <NUM> in <FIG>, and is parallel to a display surface of the display module <NUM>. The first side edge P2 is disposed at an edge of the first surface P1. When the PCB <NUM> is rectangular, the PCB <NUM> may have four side edges that are sequentially connected head to tail. The first side edge P2 may be any one of the four side edges sequentially connected head to tail. The first stub <NUM> and the second stub <NUM> may be located on the first side edge P2 of the PCB <NUM>. In addition, a second gap H2 is configured between the first stub <NUM> and the first side edge P2 of the PCB <NUM>, and the second gap H2 is further configured between the second stub <NUM> and the first side edge P2 of the PCB <NUM>.

In some embodiments of this application, as shown in <FIG>, the first radiator <NUM> may be a part of the metal rim <NUM> in <FIG>. In a process of manufacturing the first radiator <NUM>, the metal rim <NUM> may be manufactured by using a die-casting process or a computerized numerical control (computerized numerical control, CNC) machining process, and then a slit is made on the metal rim <NUM>, to form the first gap H1. One end (for example, a left end) of the first gap H1 may be used as the first end A1 of the first stub <NUM>, and the other end (for example, a right end) may be used as the first end B1 of the second stub <NUM>.

In addition, a ground point disposed on one side (for example, a left side) of the first gap H1 may be used as the second end A2 of the first stub <NUM>, and the second end A2 of the first stub <NUM> is electrically connected to the reference ground GND of the PCB <NUM> through a metal cable, a spring, or a metal sheet. When the metal sheet and the first stub <NUM> are of an integrated structure, the first stub <NUM> may be in an L shape shown in <FIG>. In addition, a ground point disposed on the other side (for example, a right side) of the first gap H1 may be used as the second end B2 of the second stub <NUM>, and the second end B2 of the second stub <NUM> is electrically connected to the reference ground GND of the PCB <NUM> through a metal cable, a spring, or a metal sheet. When the metal sheet and the second stub <NUM> are of an integrated structure, the second stub <NUM> may be in an L shape shown in <FIG>. A control chip is usually disposed on the PCB <NUM>. To protect the control chip and reduce signal interference, a shielding cover shown in <FIG> is used to cover the control chip.

In addition, as shown in <FIG>, the second radiator <NUM> is located on the PCB <NUM>, a third gap H3 is configured between the second radiator <NUM> and the first surface P1 of the PCB <NUM>, and a vertical projection of the second radiator <NUM> is located on the first surface P1 of the PCB <NUM>. To form the third gap H3 between the second radiator <NUM> and the PCB <NUM>, the antenna apparatus <NUM> may further include an antenna chassis <NUM>. The antenna chassis <NUM> may be disposed on the first surface P1 of the PCB <NUM>. A height L (with a height direction perpendicular to the PCB <NUM>) of the antenna chassis is the same as the third gap H3. The second radiator <NUM> is disposed on a surface of a side that is of the antenna chassis and that is away from the first surface P1 of the PCB <NUM>. A material of the antenna chassis <NUM> may include an insulation material, for example, plastic.

In this case, in some embodiments of this application, in a process of manufacturing the second radiator <NUM>, a laser direct structuring (laser direct structuring, LDS) process may be performed on a surface of a side disposed on the PCB <NUM> that is of the antenna chassis <NUM> and that is away from the PCB <NUM>, to metallize the surface of the side that is of the antenna chassis <NUM> and that is away from the PCB <NUM>, to form the second radiator <NUM>. Alternatively, in some other embodiments of this application, a manufactured metal sheet used as the second radiator <NUM> is attached to a surface of a side that is of the antenna chassis <NUM> and that is away from the PCB <NUM>. A manner of manufacturing the second radiator <NUM> is not limited in this application.

In some embodiments of this application, to avoid impact on performance of the second radiator <NUM>, the third gap H3 between the second radiator <NUM> and the PCB <NUM> may meet a requirement that H3 ≥ <NUM>.

In addition, as shown in <FIG>, the antenna apparatus <NUM> may further include a first feed circuit <NUM> and a second feed circuit <NUM>. The first feed circuit <NUM> is electrically connected to the first stub <NUM> and the second stub <NUM>. The first feed circuit <NUM> is configured to transmit equal-amplitude out-of-phase excitation signals to the first stub <NUM> and the second stub <NUM> respectively. That is, a signal transmitted by the first feed circuit <NUM> to the first stub <NUM> and a signal transmitted by the first feed circuit <NUM> to the second stub <NUM> are equal-amplitude out-of-phase. In this application, a manner in which the first feed circuit <NUM> feeds the first stub <NUM> and the second stub <NUM> may be referred to as asymmetrical (asymmetrical) feeding.

To enable the first feed circuit <NUM> to transmit the equal-amplitude out-of-phase excitation signals to the first stub <NUM> and the second stub <NUM> respectively, in some embodiments of this application, the first feed circuit <NUM> may include a signal conversion circuit <NUM> shown in <FIG>. The signal conversion circuit <NUM> has a first output end ①, a second output end ②, and an input end ③. Based on this, a first excitation end O1 may be disposed on the PCB <NUM>, and the input end ③ may be electrically connected to the first excitation end O1. The first output end ① may be electrically connected to the first stub <NUM>, and the second output end ② may be electrically connected to the second stub <NUM>.

In this case, the signal conversion circuit <NUM> may be configured to convert a signal output by the first excitation end O1 into a first excitation signal and a second excitation signal that are equal-amplitude out-of-phase. Next, the signal conversion circuit <NUM> may transmit the first excitation signal to the first stub <NUM> through the first output end ①, and transmit the second excitation signal to the second stub <NUM> through the second output end ②.

In this way, the first excitation signal and the second excitation signal that are output by the signal conversion circuit <NUM> may excite the antenna body <NUM> to generate a first radiation mode (radiation mode, RM). In the first radiation mode RM1, as shown in <FIG>, currents (shown by arrows in <FIG>) are mainly distributed on the first radiator <NUM>, so that the first radiator <NUM> is used as a main radiation element. In addition, in the first radiator <NUM>, a flow direction of a current distributed on the first stub <NUM> is the same as a flow direction of a current distributed on the second stub <NUM>.

In addition, there is a distance D between the first radiator <NUM> and the second radiator <NUM> (as shown in <FIG> or <FIG>). The distance D meets D ≤ <NUM>. In this way, because the distance between the first radiator <NUM> and the second radiator <NUM> is short, the first radiator <NUM> is indirectly coupled to the second radiator <NUM>. Therefore, when the first radiator <NUM> generates a current under excitation by the first excitation signal and the second excitation signal, the current may be coupled to the second radiator <NUM>, to excite the antenna body <NUM> to generate a second radiation mode RM2.

It should be noted that, in embodiments of this application, direct coupling between two components means that the two components are in direct contact, or a component configured to electrically connect the two components is disposed between the two components. Therefore, that the first radiator <NUM> is indirectly coupled to the second radiator <NUM> means that the first radiator <NUM> is not in contact with the second radiator <NUM>, and no component that is configured to electrically connect the first radiator <NUM> and the second radiator <NUM> is disposed between the first radiator <NUM> and the second radiator <NUM>.

In addition, the accompanying drawings in this application are described by using an example in which the first stub <NUM> and the second stub <NUM> in the first radiator <NUM> and the second radiator <NUM> are all in shapes of long-striped rectangles, and the second radiator <NUM> is parallel to the first stub <NUM> and the second stub <NUM>. In this case, the distance D between the first radiator <NUM> and the second radiator <NUM> refers to a distance between an edge that is of the first stub <NUM> (or the second stub <NUM>) in the first radiator <NUM> and that is close to the second radiator <NUM> and an edge that is of the second radiator <NUM> and that is close to the first radiator <NUM>.

In some other embodiments of this application, edge shapes of the first stub <NUM>, the second stub <NUM>, and the second radiator <NUM> may be irregular, and the second radiator <NUM> is not disposed in parallel to the first stub <NUM> and the second stub <NUM>. In this case, the distance D between the first radiator <NUM> and the second radiator <NUM> refers to a shortest distance between any point on an edge that is of the first stub <NUM> (or the second stub <NUM>) in the first radiator <NUM> and that is close to the second radiator <NUM> and any point on an edge that is of the second radiator <NUM> and that is close to the first radiator <NUM>.

In the second radiation mode RM2, as shown in <FIG>, currents (shown by arrows in <FIG>) are mainly distributed on the second radiator <NUM>, so that the second radiator <NUM> is used as a main radiation element (referred to as a main radiation element below for short). In addition, the currents distributed on the second radiator <NUM> have a same flow direction. In this case, under excitation of the first excitation end O1, the antenna body <NUM> may be used as a first antenna, and has the first radiation mode RM1 and the second radiation mode RM2. For example, the signal conversion circuit <NUM> may include a balun chip. In this case, the input end ③ of the signal conversion circuit <NUM> may be referred to as an unbalanced (unbalanced) port of the balun chip, and the first output end ① and the second output end ② of the signal conversion circuit <NUM> may be referred to as balanced (balanced) ports. In addition, the balun chip further includes a reference ground end ④ configured to ground. In this way, the balun chip may convert an unbalanced signal at the input end ③, and output balanced signals that are equal-amplitude out-of-phase through the first output end ① and the second output end ② respectively.

The balun chip has a small packaging size, in the antenna structure <NUM>, so that a single-end signal provided by the first excitation end O1 can be converted into two equal-amplitude out-of-phase signals by using the balun chip with a small packaging size, and a size of the antenna structure <NUM> can be reduced. In addition, an amplitude difference between the first excitation signal and the second excitation signal that are output at the first output end ① and the second output end ② of the balun chip respectively may be within a range of <NUM> dB to <NUM> dB, and a phase difference between the first excitation signal and the second excitation signal is approximately <NUM>±<NUM>°. Therefore, the first output end ① and the second output end ② have a high balance degree, so that the first excitation signal and the second excitation signal can meet an equal-amplitude out-of-phase requirement, to effectively excite the antenna body <NUM> to generate the first radiation mode and the second radiation mode.

In addition, as shown in <FIG>, the second feed circuit <NUM> may be electrically connected to the first stub <NUM> and the second stub <NUM> in the first radiator <NUM>. The second feed circuit <NUM> may further be electrically connected to a second excitation end <NUM> disposed on the PCB <NUM>. The second feed circuit <NUM> may simultaneously transmit, to the first stub <NUM> and the second stub <NUM>, a signal output by the second excitation end <NUM>, and excite the antenna body <NUM> to generate a third radiation mode RM3. Therefore, the second feed circuit <NUM> transmits a same excitation signal to the first stub <NUM> and the second stub <NUM>. In this application, a manner in which the second feed circuit <NUM> feeds the first stub <NUM> and the second stub <NUM> may be referred to as symmetrical (symmetrical) feeding.

In the third radiation mode RM3, as shown in <FIG>, currents (shown by arrows in <FIG>) are mainly distributed on the first radiator <NUM>, so that the first radiator <NUM> is used as a main radiation element. In addition, in the first radiator <NUM>, a flow direction of a current distributed on the first stub <NUM> is opposite to that of a current distributed on the second stub <NUM> relative to the first gap H1.

It should be noted that signals output by the first excitation end O1 and the second excitation end <NUM> are not limited in this application, and may be the same or may be different. The first excitation end O1 and the second excitation end <NUM> may be disposed on a same surface of the PCB <NUM>, for example, the first surface P1, or may be disposed on two opposite surfaces of the PCB <NUM> respectively, for example, disposed on the first surface P1 of the PCB <NUM> and a surface opposite to the first surface P1 respectively.

In addition, in some embodiments of this application, the antenna apparatus <NUM> further includes a second configuration circuit <NUM> shown in <FIG>. The second configuration circuit <NUM> may be disposed between the second radiator <NUM> and the reference ground GND of the PCB <NUM>, and is electrically connected to a center of the second radiator <NUM> and the reference ground GND of the PCB <NUM>. Based on this, because a distance between the first radiator <NUM> and the second radiator <NUM> is short, for example, a distance D between the first radiator <NUM> and the second radiator <NUM> meets D ≤ <NUM>, when the first radiator <NUM> generates a current under excitation of the second feed circuit <NUM>, the current may be coupled to the second radiator <NUM>, to implement coupling between the first radiator <NUM> and the second radiator <NUM>, and excite the antenna body <NUM> to generate a fourth radiation mode RM4. The second configuration circuit <NUM> is configured to tune a resonance frequency and bandwidth of the second radiator <NUM> in the fourth radiation mode RM4. In this way, the second configuration circuit <NUM> may be configured based on a requirement, so that the resonance frequency and bandwidth of the second radiator <NUM> in the fourth radiation mode RM4 meet a requirement.

It should be noted that, that the second configuration circuit <NUM> is electrically connected to a center of the second radiator <NUM> means that, on a premise that when the antenna body <NUM> is in the second radiation mode RM2 and the fourth radiation mode RM4, a current on the first radiator <NUM> may be coupled to the second radiator <NUM>, so that the second radiator <NUM> is used as a main radiator, the center of the second radiator <NUM> may be a center of a geometric shape of the second radiator <NUM>, or the center of the second radiator <NUM> may be shifted by <NUM>% left or right from the center of the geometric shape of the second radiator <NUM> in a length direction of the strip-shaped second radiator <NUM>.

In the fourth radiation mode RM4, as shown in <FIG>, currents (shown by arrows in <FIG>) are mainly distributed on the second radiator <NUM>, so that the second radiator <NUM> is used as a main radiation element. In addition, flow directions of the currents distributed on the second radiator <NUM> are opposite to each other relative to the center of the second radiator <NUM>, that is, the flow directions of the currents distributed on the second radiator <NUM> are separately from two ends of the second radiator <NUM> to the center of the second radiator <NUM>. In this case, under excitation of the second excitation end <NUM>, the antenna body <NUM> may be used as a second antenna, and has the foregoing third radiation mode RM3 and the fourth radiation mode RM4. In this way, the antenna body <NUM> may be used as the first antenna under excitation of the first excitation end O1, or may be used as the second antenna under excitation of the second excitation end <NUM>, to form dual antennas.

The foregoing description is provided by using an example in which the second radiator <NUM> is electrically connected to the reference ground GND of the PCB <NUM> through the second configuration circuit <NUM>. In this case, the second feed circuit <NUM> may excite the antenna body <NUM> to generate the third radiation mode RM3 and the fourth radiation mode RM4. In some other embodiments of this application, the second radiator <NUM> may be a passive resonance structure, and the second radiator <NUM> is neither electrically connected to the reference ground nor to the excitation end. In this case, the second feed circuit <NUM> may excite the antenna body <NUM> to generate only the third radiation mode RM3. For ease of description, an example is used below in which the second configuration circuit <NUM> is disposed between the second radiator <NUM> and the reference ground GND of the PCB <NUM>, and the second feed circuit <NUM> excites the antenna body <NUM> to generate the third radiation mode RM3 and the fourth radiation mode RM4.

In conclusion, in the antenna structure <NUM> provided in this embodiment of this application, the first feed circuit <NUM> can excite the antenna body <NUM> as the first antenna to generate the first radiation mode RM1 shown in <FIG> and the second radiation mode RM2 shown in <FIG>. In addition, the second feed circuit <NUM> may excite the antenna body <NUM> as the second antenna to generate the third radiation mode RM3 shown in <FIG> and the fourth radiation mode RM4 shown in <FIG>. In this way, in one aspect, the first feed circuit <NUM> and the second feed circuit <NUM> may separately excite the antenna mode <NUM> to generate two radiation modes. In this case, the antenna structure <NUM> in this application may excite the foregoing four modes. In addition, a frequency range covered by the first radiation mode RM1, a frequency range covered by the second radiation mode RM2, a frequency range covered by the third radiation mode RM3, and a frequency range covered by the fourth radiation mode RM4 of the antenna body <NUM> may be at least partially different from each other. In this way, either of the first excitation end O1 (electrically connected to the first feed circuit <NUM>) and the second excitation end <NUM> (electrically connected to the second feed circuit <NUM>) can excite the antenna body <NUM> to generate two radiation modes. Therefore, the antenna body <NUM> can transmit more data. Compared with a solution in which one excitation end can excite only one antenna mode, the solution provided in this embodiment of this application can enable the antenna body <NUM> to obtain a wider bandwidth.

In some embodiments of this application, the antenna body <NUM> may be used as a transmit antenna (or a receive antenna) when operating in the first radiation mode RM1 and the second radiation mode RM2 that are generated through excitation of the first feed circuit <NUM>, and the antenna body <NUM> may be used as a receive antenna (or a transmit antenna) when operating in the third radiation mode RM3 and the fourth radiation mode RM4 that are generated through excitation of the second feed circuit <NUM>. Alternatively, in some other embodiments of this application, when operating in the foregoing four excitation modes (the first radiation mode RM1, the second radiation mode RM2, the third radiation mode RM3, and the fourth radiation mode RM4), the antenna body <NUM> may be used as only a transmit antenna or as only a receive antenna.

In addition, when the first radiator <NUM> is used as a main radiator, the antenna body <NUM> needs to satisfy specific symmetry, to balance two current signals respectively received on the first stub <NUM> and the second stub <NUM>, so as to improve isolation between different excitation ends, for example, the first excitation end O1 and the second excitation end <NUM> (or the first antenna and the second antenna). For example, the first stub <NUM> and the second stub <NUM> in the first radiator <NUM> may be disposed symmetrically with respect to a center of the first gap H1 (as shown in <FIG>). In this case, when the antenna body <NUM> is in the third radiation mode RM3, in the first radiator <NUM> that is used as a main radiator, a current distributed on the first stub <NUM> and a current distributed on the second stub <NUM> have flow directions opposite to each other relative to the first gap H1, and are symmetrically distributed with respect to the center of the first gap H1.

In addition, when the second radiator <NUM> is strip-shaped as shown in <FIG>, a center of the second radiator <NUM> and the center of the first gap H1 may be in a same straight line, so that the antenna body <NUM> can meet specific symmetry. In this case, when the antenna body <NUM> is in the fourth radiation mode RM4, in the second radiator <NUM> that is used as a main radiator, currents distributed on the second radiator <NUM> have flow directions opposite to each other relative to the center of the second radiator <NUM>, and are symmetrically distributed with respect to the center of the second radiator <NUM>.

It should be noted that, that the first stub <NUM> and the second stub <NUM> are disposed symmetrically with respect to the center of the first gap H1 means that, on the premise that a requirement on isolation between the first excitation end O1 and the second excitation end <NUM> (or the first antenna and the second antenna) is met, the first stub <NUM> and the second stub <NUM> may be approximately disposed symmetrically with respect to the center of the first gap H1, and the first stub <NUM> and the second stub <NUM> are not limited to be strictly disposed symmetrically with respect to the center of the first gap H1. In addition, that the center of the second radiator <NUM> and the center of the first gap H1 may be in a same straight line means that on a premise that a requirement on isolation between the first excitation end O1 and the second excitation end <NUM> (or the first antenna and the second antenna) is met, the center of the second radiator <NUM> and the center of the first gap H1 may be approximately in a same straight line, and the center of the second radiator <NUM> and the center of the first gap H1 are not limited to be strictly disposed in a same straight line.

Based on this, it can be learned from the foregoing description that, when the first feed circuit <NUM> excites the antenna body <NUM> to generate the first radiation mode RM1, and when the second feed circuit <NUM> excites the antenna body <NUM> to generate the third radiation mode RM3, the first radiator <NUM> is used as the main radiation element. However, in the first radiation mode RM1, as shown in <FIG>, in the first radiator <NUM>, the flow direction of the current distributed on the first stub <NUM> is the same as the flow direction of the current distributed on the second stub <NUM>. In the third radiation mode RM3, as shown in <FIG>, in the first radiator <NUM>, the flow direction of the current distributed on the first stub <NUM> is opposite to the flow direction of the current distributed on the second stub <NUM> relative to the first gap H1.

Therefore, when the antenna body <NUM> meets the foregoing symmetry, currents on the antenna body <NUM> (for example, the first radiator <NUM>) in the first radiation mode RM1 generated through excitation of the first excitation end O1 may be orthogonal to currents on the antenna body <NUM> in the third radiation mode RM3 and the fourth radiation mode RM4 generated through excitation of the second excitation end <NUM> (the currents are distributed on the first radiator <NUM> in the third radiation mode RM3, and the currents are distributed on the second radiator <NUM> in the fourth radiation mode RM4). In this case, radio waves on the antenna body <NUM> (for example, the first radiator <NUM>) in the first radiation mode RM1 may be orthogonal to radio waves on the antenna body <NUM> in the third radiation mode RM3 and the fourth radiation mode RM4 (in the third radiation mode RM3, the first radiator <NUM> mainly generates the radio waves, and in the fourth radiation mode RM4, the second radiator <NUM> mainly generates the radio waves). Therefore, under excitation of different excitation ends (for example, the first excitation end O1 and the second excitation end <NUM>), isolation between the first antenna and the second antenna separately formed by a same radiator in the antenna body <NUM>, for example, the first radiator <NUM>, is high.

Similarly, when the first feed circuit <NUM> electrically connected to the first excitation end O1 excites the antenna body <NUM> to generate the second radiation mode RM2, and when the second feed circuit <NUM> electrically connected to the second excitation end <NUM> excites the antenna body <NUM> to generate the fourth radiation mode RM4, the second radiator <NUM> is used as the main radiating element. However, in the second radiation mode RM2, as shown in <FIG>, the currents distributed on the second radiator <NUM> have a same flow direction. In the fourth radiation mode RM4, as shown in <FIG>, the currents distributed on the second radiator <NUM> have flow directions opposite to each other relative to the center of the second radiator <NUM>.

Therefore, when the antenna body <NUM> meets the foregoing symmetry, currents on the antenna body <NUM> (for example, the second radiator <NUM>) in the second radiation mode RM2 generated through excitation of the first excitation end O1 may be orthogonal to currents on the antenna body <NUM> in the third radiation mode RM3 and the fourth radiation mode RM4 generated through excitation of the second excitation end <NUM> (for example, the currents are distributed on the first radiator <NUM> in the third radiation mode RM3, and the currents are distributed on the second radiator <NUM> in the fourth radiation mode RM4). In this case, radio waves on the antenna body <NUM> (for example, the second radiator <NUM>) in the second radiation mode RM2 may be orthogonal to radio waves on the antenna body <NUM> in the third radiation mode RM3 and the fourth radiation mode RM4 (for example, in the third radiation mode RM3, the first radiator <NUM> mainly generates the radio waves, and in the fourth radiation mode RM4, the second radiator <NUM> mainly generates the radio waves). Therefore, under excitation of different excitation ends (for example, the first excitation end O1 and the second excitation end <NUM>), isolation between a first antenna and a second antenna separately formed by a same radiator in the antenna body <NUM>, for example, the second radiator <NUM>, is high.

In conclusion, under excitation of the first excitation end O1 and the second excitation end <NUM>, the first radiation mode RM1 is orthogonal to the third radiation mode RM3 and the fourth radiation mode RM4, and the second radiation mode RM2 is orthogonal to the third radiation mode RM3 and the fourth radiation mode RM4. Therefore, isolation between the first antenna and the second antenna separately formed by the antenna body <NUM> under the different excitation ends is high, so that dual antennas with high isolation can be implemented based on an increased bandwidth of the antenna body <NUM>.

In another aspect, it can be learned from the foregoing that, the first radiator <NUM> may be a part of the metal rim <NUM>, and the first gap H1 is formed by making a slit on the metal rim <NUM>, so that the first stub <NUM> and the second stub <NUM> in the first radiator <NUM> can be manufactured. In a process of manufacturing the first radiator <NUM>, only one slit, that is, the foregoing first gap H1, needs to be formed on the metal rim <NUM>. Therefore, there are fewer demands on slit making on the metal rim <NUM>, which helps improve an appearance effect of the electronic product.

In some embodiments of this application, radiation frequencies of the antenna body <NUM> in the foregoing four excitation modes may cover a low frequency band (for example, approximately <NUM> to <NUM>), a medium-high frequency band (for example, <NUM> to <NUM>), an N77 frequency band (<NUM> to <NUM>), or an N79 frequency band (<NUM> to <NUM>). In addition, frequency bands in which the antenna body <NUM> works in different excitation modes may overlap. For example, the antenna body <NUM> in the first radiation mode RM1 and the third radiation mode RM3 (or in the second radiation mode RM2 and the fourth radiation mode RM4) may be applied to intra-frequency Wi-Fi dual antennas and intra-frequency Bluetooth dual antennas. Alternatively, frequency bands in which the antenna body <NUM> works in the different excitation modes may not overlap. For example, the antenna body <NUM> in the first radiation mode RM1 and the third radiation mode RM3 (or in the second radiation mode RM2 and the fourth radiation mode RM4) may be applied to a Wi-Fi (<NUM>) and medium-high frequency dual antennas.

Based on this, to further tune the radiation frequencies and bandwidths of the antenna body <NUM>, the following describes in detail a structure of the antenna body <NUM> and a manner of disposing internal elements.

In some embodiments of this application, radiation frequencies of the antenna body <NUM> may cover a medium-high frequency band (for example, <NUM> to <NUM>). In this case, the antenna body <NUM> may include a first configuration circuit <NUM> shown in <FIG>. In some embodiments of this application, the first configuration circuit <NUM> may include a first capacitor C1 and a second capacitor C2 shown in <FIG>.

A first end of the first capacitor C1 is electrically connected to the first output end ① of the signal conversion circuit <NUM>, and a second end of the first capacitor C1 is electrically connected to the first stub <NUM>. A first end of the second capacitor C2 is electrically connected to the second output end ② of the signal conversion circuit <NUM>, and a second end of the second capacitor C2 is electrically connected to the second stub <NUM>.

The first capacitor C1 and the second capacitor C2 are used for feeding matching. For example, when capacitance values of the first capacitor C1 and the second capacitor C2 are larger, a resonance frequency of the antenna body <NUM> is lower when the first feed circuit <NUM> excites the antenna body <NUM> to generate the first radiation mode RM1; or when capacitance values of the first capacitor C1 and the second capacitor C2 are smaller, a resonance frequency of the antenna body <NUM> is higher when the first feed circuit <NUM> excites the antenna body <NUM> to generate the first radiation mode RM1.

In some other embodiments of this application, the first configuration circuit <NUM> may further include a fourth inductor L4. A first end of the fourth inductor L4 is electrically connected to the first end of the first capacitor C1, and a second end of the fourth inductor L4 is electrically connected to the first end of the second capacitor C2.

In this case, the fourth inductor L4 may tune a depth of an input return loss (S11) curve of the antenna body <NUM> (that is, an input return loss of the antenna body <NUM>) and a width of the resonance frequency when the first feed circuit <NUM> excites the antenna body <NUM> to generate the first radiation mode RM1. When an inductance value of the fourth inductor L4 is smaller, the depth of the input return loss (S11) curve of the antenna body <NUM> is greater (that is, the input return loss of the antenna body <NUM> is smaller), and the width of the resonance frequency is smaller; or when an inductance value of the fourth inductor L4 is larger, the depth of the S parameter curve is smaller, and the width of the resonance frequency is greater.

Based on this, when the first feed circuit <NUM> excites the antenna body <NUM> to generate the first radiation mode RM1, to tune the resonance frequency of the antenna body <NUM> based on a requirement, in some embodiments of this application, as shown in <FIG>, the first configuration circuit <NUM> may further include at least two first tuning components <NUM>.

The first tuning component <NUM> is electrically connected between the second end of the first capacitor C1 and the second end of the second capacitor C2. The first tuning component <NUM> may include a first inductor L1 and a first radio frequency switch Lsw1 that are connected in series. One end of the first inductor L1 is electrically connected to the second end of the first capacitor C1 and the first stub <NUM>, and the other end of the first inductor L1 is electrically connected to one end of the first radio frequency switch Lsw1. The other end of the first radio frequency switch Lsw1 is electrically connected to the second end of the second capacitor C2 and the second stub <NUM>. Inductance values of first inductors L1 in different first tuning components <NUM> may be the same or may be different.

In this way, a quantity of first inductors L1 connected in parallel in the first configuration circuit <NUM> can be controlled by controlling on and off states of first radio frequency switches Lsw1. When the quantity of first inductors L1 connected in parallel in the first configuration circuit <NUM> is larger, inductive reactance between the first stub <NUM> and the second stub <NUM> is lower, and a resonance frequency of the antenna body <NUM> in the first radiation mode RM1 is higher; or when the quantity of first inductors L1 connected in parallel in the first configuration circuit <NUM> is smaller, inductive reactance between the first stub <NUM> and the second stub <NUM> is higher, and a resonance frequency of the antenna body <NUM> in the first radiation mode RM1 is lower.

The following describes the first radiation mode RM1 and the second radiation mode RM2 that are generated when the first feed circuit <NUM> excites the antenna body <NUM> as the first antenna by setting a structure size of the antenna body <NUM> and parameters of elements in the first configuration circuit <NUM>.

For example, as shown in <FIG>, a length S1 of the first stub <NUM> (that is, a distance between the first end A1 and the second end A2 of the first stub <NUM>) and a length S2 of the second stub <NUM> (that is, a distance between the first end B1 and the second end B2 of the second stub <NUM>) may be approximately <NUM> ± <NUM>. The first gap H1 between the first stub <NUM> and the second stub <NUM> may be approximately <NUM> ± <NUM>.

A length S3 of the second radiator <NUM> may be approximately <NUM> ± <NUM>, and a width S4 of the second radiator <NUM> may be approximately <NUM> ± <NUM>. A material of the antenna chassis <NUM> (as shown in <FIG>) configured to support the second radiator <NUM> may be plastic. A dielectric constant of the plastic may be approximately <NUM>. In addition, the back cover <NUM> (as shown in <FIG>) of the electronic device <NUM> is located on a surface of a side that is of the second radiator <NUM> and that is away from the PCB <NUM>. A material of the back cover <NUM> may be glass, and a dielectric constant of the glass is approximately <NUM>. In addition, the parameters of the elements in the first configuration circuit <NUM> in <FIG> are shown in Table <NUM>.

Table <NUM> is described by using an example in which three groups of first tuning components <NUM> are disposed in the first configuration circuit <NUM>, and inductance values of first inductors (L1a, L1b, and L1c) in the first tuning components <NUM> are different. A quantity of first tuning components <NUM> in the first configuration circuit <NUM> and an inductance value of a first inductor in each first tuning component <NUM> are not limited in this application.

In this case, it can be learned from the foregoing that, when the antenna body <NUM> generates the first radiation mode RM1 under excitation of the first feed circuit <NUM>, as shown in <FIG>, currents are mainly distributed on the first stub <NUM> and the second stub <NUM> in the first radiator <NUM>, and the first configuration circuit <NUM> is disposed between the first stub <NUM> and the second stub <NUM>. Therefore, an inductance value of each first inductor is set, and on and off of the first radio frequency switch Lsw1 in each first tuning component <NUM> is controlled, so that when the antenna body <NUM> is in the first radiation mode RM1, the radiation frequency of the antenna body <NUM> may cover a frequency range of <NUM> to <NUM> (that is, a Band <NUM> frequency band), a frequency range of <NUM> to <NUM> (that is, a Band <NUM> frequency band), a frequency range of <NUM> to <NUM> (that is, a Band <NUM> frequency band), or a frequency range of <NUM> to <NUM> (that is, a Band <NUM> frequency band).

In addition, when the antenna body <NUM> generates the second radiation mode RM2 under excitation of the first feed circuit <NUM>, as shown in <FIG>, currents are mainly distributed on the second radiator <NUM>. In this case, by controlling the length S3 (as shown in <FIG>) of the second radiator <NUM>, a resonance frequency of the antenna body <NUM> in the second radiation mode RM2 may be fixed at approximately one resonance frequency. When the length S3 of the second radiator <NUM> is greater, a resonance frequency of the antenna body <NUM> in the second radiation mode RM2 is lower; or when the length S3 of the second radiator <NUM> is smaller, the resonance frequency of the antenna body <NUM> in the second radiation mode RM2 is higher.

For example, when the length S3 of the second radiator <NUM> is approximately <NUM> ± <NUM>, the resonance frequency of the antenna body <NUM> in the second radiation mode RM2 may be approximately <NUM> (<NUM> lower or higher).

In this case, as shown in <FIG>, an S parameter curve ① has two resonance frequencies, which are respectively near <NUM> and near <NUM>. <NUM> is in the foregoing Band <NUM> frequency band. An S parameter curve ② has two resonance frequencies, which are respectively near <NUM> and near <NUM>. <NUM> is in the foregoing Band <NUM> frequency band. An S parameter curve ③ has two resonance frequencies, which are respectively near <NUM> and near <NUM>. <NUM> is in the foregoing Band <NUM> frequency band. An S parameter curve ④ has two resonance frequencies, which are respectively near <NUM> and near <NUM>. <NUM> is in the foregoing Band <NUM> frequency band.

It can be learned from the foregoing description that, under excitation of the first feed circuit <NUM>, when the antenna body <NUM> works in the first radiation mode RM1, in the first configuration circuit <NUM>, the inductance value of the first inductor L1 and a quantity of a plurality of first inductors L1 connected in parallel may be adjusted based on a requirement, so that the resonance frequency of the antenna body <NUM> can be switched between the Band <NUM> frequency band, the Band <NUM> frequency band, the Band <NUM> frequency band, and the Band <NUM> frequency band. In this case, the antenna body <NUM> can cover a wide bandwidth.

It should be noted that, the foregoing description is provided by using an example in which the length S1 of the first stub <NUM> is the same as the length S2 of the second stub <NUM> in the first radiator <NUM>. In some other embodiments of this application, a structure of the antenna body <NUM> and the circuit structure do not need to be set to a centrosymmetric structure. For example, when the length S1 of the first stub <NUM> is different from the length S2 of the second stub <NUM>, the capacitance values of the first capacitor C1 and the second capacitor C2 in the first configuration circuit <NUM> may be adjusted, to reduce mutual impact between different radiation modes of the antenna body <NUM>, and improve isolation of antennas in the different radiation modes.

In addition, as shown in <FIG>, it can be seen from an antenna system efficiency curve ① of a resonance frequency of the antenna body <NUM> in the Band <NUM> frequency band that, the resonance frequency of the antenna body <NUM> is near <NUM>, and system efficiency of the antenna body <NUM> is higher than -<NUM> dB. It can be seen from an antenna system efficiency curve ② of a resonance frequency of the antenna body <NUM> in the Band <NUM> frequency band that, the resonance frequency of the antenna body <NUM> is near <NUM>, and system efficiency of the antenna body <NUM> is higher than -<NUM> dB. It can be seen from an antenna system efficiency curve ③ of a resonance frequency of the antenna body <NUM> in the Band <NUM> frequency band that, the resonance frequency of the antenna body <NUM> is near <NUM>, and system efficiency of the antenna body <NUM> is higher than -<NUM> dB. It can be seen from an antenna system efficiency curve ④ of a resonance frequency of the antenna body <NUM> in the Band <NUM> frequency band that, the resonance frequency of the antenna body <NUM> is near <NUM>, and system efficiency of the antenna body <NUM> is higher than -<NUM> dB. Therefore, in the first radiation mode RM1, when frequencies of signals radiated by the antenna body <NUM> are at the resonance frequencies in the frequency bands that can be covered by the antenna body <NUM>, system efficiency may be lower than -<NUM> dB, and system efficiency is high.

The foregoing describes setting and adjustment of resonance frequencies of the antenna body <NUM> in the first radiation mode RM1 and the second radiation mode RM2 under excitation of the first feed circuit <NUM>. In addition, it can be learned from the foregoing description that, under excitation of the second feed circuit <NUM>, the antenna body <NUM> may generate the third radiation mode RM3 shown in <FIG>. In this mode, although the first radiator <NUM> is used as a main radiator, in this case, a magnitude of inductive reactance of the first configuration circuit <NUM> (as shown in <FIG>) that is electrically connected between the first output end ① and the second output end ② of the signal conversion circuit <NUM> (or between the first stub <NUM> and the second stub <NUM>) basically does not affect a resonance frequency of the antenna body <NUM> in the third radiation mode RM3.

Therefore, in the third radiation mode RM3, the resonance frequency of the antenna body <NUM> cannot be tuned by using the first configuration circuit <NUM>. In this case, the length S1 of the first stub <NUM> and the length S2 of the second stub <NUM> in the first radiator <NUM> that are shown in <FIG> may be set, so that the resonance frequency of the antenna body <NUM> in the third radiation mode RM3 is fixed at approximately one resonance frequency. When the length S1 of the first stub <NUM> and the length S2 of the second stub <NUM> are greater, the resonance frequency of the antenna body <NUM> in the third radiation mode RM3 is lower; or when the length S1 of the first stub <NUM> and the length S2 of the second stub <NUM> are smaller, the resonance frequency of the antenna body <NUM> in the third radiation mode RM3 is higher. For example, if L1 = L2 = <NUM> ± <NUM>, the resonance frequency of the antenna body <NUM> in the third radiation mode RM3 may be fixed in the Band <NUM> frequency band (that is, a frequency range of <NUM> to <NUM>).

In addition, as shown in <FIG>, to enable the second feed circuit <NUM> to feed the first radiator <NUM>, a cable <NUM> may be formed on the PCB <NUM> (a material of the PCB <NUM> may be FR4). When the PCB <NUM> includes a plurality of layers of sub-circuit boards, a clearance height of the cable <NUM> on the PCB <NUM> may be a thickness of one layer of sub-circuit board. Based on this, in some embodiments of this application, a length S5 of the cable <NUM> may be approximately <NUM> ± <NUM>, and a width S6 of the cable may be approximately <NUM> ± <NUM>.

To enable a resonance frequency of the antenna body <NUM> in the fourth radiation mode RM4 to be tuned based on a requirement under excitation of the second feed circuit <NUM>, in some embodiments of this application, as shown in <FIG>, the second configuration circuit <NUM> configured to electrically connect the second radiator <NUM> to the reference ground GND of the PCB <NUM> may include at least two second tuning components <NUM>.

The second tuning component <NUM> is electrically connected between the center of the second radiator <NUM> and the reference ground GND of the PCB <NUM>. Each second tuning component <NUM> may include a second inductor L2 and a second radio frequency switch Lsw2 that are connected in series. One end of the second inductor L2 is electrically connected to the center of the second radiator <NUM>, and the other end of the second inductor L2 is electrically connected to one end of the second radio frequency switch Lsw2. The other end of the second radio frequency switch Lsw2 is electrically connected to the reference ground GND of the PCB <NUM>. Alternatively, in some other embodiments of this application, one end of the second radio frequency switch Lsw2 is electrically connected to the center of the second radiator <NUM>, the other end of the second radio frequency switch Lsw2 is electrically connected to one end of the second inductor L2, and the other end of the second inductor L2 is electrically connected to the reference ground GND of the PCB <NUM>.

In this way, a quantity of second inductors L2 connected in parallel in the second configuration circuit <NUM> can be controlled by controlling on and off states of second radio frequency switches Lsw2. When a quantity of second inductors L2 connected in parallel in the second configuration circuit <NUM> is larger, inductive reactance between the second radiator <NUM> and the reference ground GND of the PCB <NUM> is lower, and the resonance frequency of the antenna body <NUM> in the fourth radiation mode RM4 is higher; or when a quantity of second inductors L2 connected in parallel in the second configuration circuit <NUM> is smaller, inductive reactance between the second radiator <NUM> and the reference ground GND of the PCB <NUM> is higher, and the resonance frequency of the antenna body <NUM> in the fourth radiation mode RM4 is lower.

Inductance values of second inductors L2 in different second tuning components <NUM> in the second configuration circuit <NUM> are not limited in this application. Inductance values of the second inductors L2 in the different second tuning components <NUM> may be the same or may be different. In some embodiments of this application, an inductance value of each second inductor L2 may be set, and on and off of the second radio frequency switch Lsw2 in each second tuning component <NUM> may be controlled, so that when the antenna body <NUM> is in the fourth radiation mode RM4, the radiation frequency of the antenna body <NUM> may cover the Band <NUM> frequency band (that is, a frequency range of <NUM> to <NUM>), the Band <NUM> frequency band (that is, a frequency range of <NUM> to <NUM>), and/or the Band <NUM> frequency band (that is, a frequency range of <NUM> to <NUM>). The following describes the third radiation mode RM3 and the fourth radiation mode RM4 that are generated when the second feed circuit <NUM> excites the antenna body <NUM> as the second antenna.

In this case, as shown in <FIG>, a curve ① is an S parameter curve of the antenna body <NUM> under excitation of the second feed circuit <NUM>. In this case, the resonance frequency of the antenna body <NUM> in the fourth radiation mode RM4 is near <NUM>, that is, in the foregoing Band <NUM> frequency band. The resonance frequency of the antenna body <NUM> in the third radiation mode RM3 is near <NUM>, that is, in the foregoing Band <NUM> frequency band. Therefore, under the excitation of the second feed circuit <NUM>, a radiation mode of the antenna body <NUM> may cover the Band <NUM> frequency band (the fourth radiation mode RM4) and the Band <NUM> frequency band (the third radiation mode RM3). A curve ② is an S parameter curve of the antenna body <NUM> under excitation of the first feed circuit <NUM>. As shown in <FIG>, it can be seen from a radiation efficiency curve ① of the antenna body <NUM> that, when the antenna body <NUM> is in the Band <NUM> frequency band, a resonance frequency of the antenna body <NUM> is near <NUM>, and radiation efficiency is higher than -<NUM> dB. When the antenna body <NUM> is in the Band <NUM> frequency band, a resonance frequency of the antenna body <NUM> is near <NUM>, and radiation efficiency is near -<NUM> dB, which indicates high radiation efficiency. In addition, it can be seen from a system efficiency curve ② of the antenna body <NUM> that, when the antenna body is in the Band <NUM> frequency band, a resonance frequency of the antenna body <NUM> is near <NUM>, and system efficiency of the antenna body <NUM> is near -<NUM> dB. When the antenna body <NUM> is in the Band <NUM> frequency band, a resonance frequency of the antenna body <NUM> is near <NUM>, and system efficiency is near -<NUM> dB. Because under excitation of the second feed circuit <NUM>, the antenna body <NUM> may be mainly used as the second antenna to receive downlink data, when the antenna system efficiency is near -<NUM> dB, a requirement can also be met.

In addition, as shown in <FIG>, a curve ① is an S parameter curve of the antenna body <NUM> under excitation of the second feed circuit <NUM>. In this case, the resonance frequency of the antenna body <NUM> in the fourth radiation mode RM4 is near <NUM>, that is, in the foregoing Band <NUM> frequency band. The resonance frequency of the antenna body <NUM> in the third radiation mode RM3 is near <NUM>, that is, in the foregoing Band <NUM> frequency band. Therefore, under the excitation of the second feed circuit <NUM>, a radiation mode of the antenna body <NUM> may cover the Band <NUM> frequency band (the fourth radiation mode RM4) and the Band <NUM> frequency band (the third radiation mode RM3). A curve ② is an S parameter curve of the antenna body <NUM> under excitation of the first feed circuit <NUM>.

As shown in <FIG>, it can be seen from a radiation efficiency curve ① of the antenna body <NUM> that, when the antenna body <NUM> is in the Band <NUM> frequency band, a resonance frequency of the antenna body <NUM> is near <NUM>, and radiation efficiency is higher than -<NUM> dB. When the antenna body <NUM> is in the Band <NUM> frequency band, a resonance frequency of the antenna body <NUM> is near <NUM>, and radiation efficiency is higher than -<NUM> dB, which indicates high radiation efficiency. In addition, it can be seen from a system efficiency curve ② of the antenna body <NUM> that, when the antenna body is in the Band <NUM> frequency band, a resonance frequency of the antenna body <NUM> is near <NUM>, and system efficiency of the antenna body <NUM> is near -<NUM> dB. When the antenna body <NUM> is in the Band <NUM> frequency band, a resonance frequency of the antenna body <NUM> is near <NUM>, and system efficiency is higher than -<NUM> dB, which indicates high system efficiency.

In addition, as shown in <FIG>, a curve ① is an S parameter curve of the antenna body <NUM> under excitation of the second feed circuit <NUM>. In this case, the resonance frequency of the antenna body <NUM> in the fourth radiation mode RM4 is near <NUM>, that is, near the foregoing Band <NUM> frequency band. The resonance frequency of the antenna body <NUM> in the third radiation mode RM3 is near <NUM>, that is, in the foregoing Band <NUM> frequency band. Therefore, a radiation mode of the antenna body <NUM> under excitation of the second feed circuit <NUM> covers the Band <NUM> frequency band, so that a bandwidth can be increased. A curve ② is an S parameter curve of the antenna body <NUM> under excitation of the first feed circuit <NUM>. In addition, isolation between the formed second antenna and the first antenna is high under separate excitation of the second feed circuit <NUM> and the first feed circuit <NUM>. As shown by a thin solid line in <FIG>, the isolation may be approximately <NUM> dB.

As shown in <FIG>, it can be seen from a radiation efficiency curve ① of the antenna body <NUM> that, when the antenna body <NUM> is in the Band <NUM> frequency band and near the Band <NUM> frequency band, radiation efficiency is higher than -<NUM> dB. It can be seen from a system efficiency curve ② of the antenna body <NUM> that, when the antenna body <NUM> is in the Band <NUM> frequency band and near the Band <NUM> frequency band, system efficiency of the antenna body <NUM> is approximately -<NUM> dB, which indicates high system efficiency.

It can be learned from the foregoing description that, under excitation of the second feed circuit <NUM>, when the antenna body <NUM> works in the fourth radiation mode RM4, in the second configuration circuit <NUM>, the inductance value of the second inductor L2 and a quantity of second inductors L2 connected in parallel may be adjusted based on a requirement, so that the resonance frequency of the antenna body <NUM> can be switched between the Band <NUM> frequency band, the Band <NUM> frequency band, and the Band <NUM> frequency band. In this case, the antenna body <NUM> can cover a wide bandwidth.

It should be noted that, as shown in <FIG>, <FIG>, and <FIG>, when a parameter of a component in the second configuration circuit <NUM> is changed, and a resonance frequency of the second antenna (formed under excitation of the second feed circuit <NUM>) is tuned, a resonance frequency of the first antenna (formed under excitation of the first feed circuit <NUM>) does not change with a change of the parameter of the component in the second configuration circuit <NUM>. Similarly, when a parameter of a component in the first configuration circuit <NUM> is changed, and a resonance frequency of the first antenna is tuned, a resonance frequency of the second antenna does not change with a change of the parameter of the component in the first configuration circuit <NUM>. The two antennas can be tuned independently.

An example is used above to describe a structure of the antenna body <NUM> and a manner of setting an internal element, in which when the antenna body <NUM> is in the first radiation mode RM1 and when the antenna body <NUM> is excited by the first feed circuit <NUM>, the inductance value of the first inductor L1 and the quantity of first inductors L1 connected in parallel may be adjusted in the first configuration circuit <NUM>, to implement an adjustable resonance frequency, for example, switching between the Band <NUM> frequency band, the Band <NUM> frequency band, the Band <NUM> frequency band, and the Band <NUM> frequency band; and when the antenna body <NUM> is in the fourth radiation mode RM4 and when the antenna body <NUM> is excited by the second feed circuit <NUM>, the inductance value of the second inductor L2 and the quantity of second inductors L2 connected in parallel may be adjusted in the second configuration circuit <NUM>, to implement an adjustable resonance frequency, for example, switching between the Band <NUM> frequency band, the Band <NUM> frequency band, and the Band <NUM> frequency band.

In some other embodiments of this application, a structure and an internal element of the antenna body <NUM> may be set, so that a radiation frequency of the antenna body <NUM> may be fixed at an N41 frequency band (a frequency range of <NUM> to <NUM>) and an N78 frequency band (<NUM> to <NUM>). When the antenna body <NUM> includes the first configuration circuit <NUM> shown in <FIG>, the first configuration circuit <NUM> may include a third capacitor C3 and a fourth capacitor C4 shown in <FIG>. A first end of the third capacitor C3 is electrically connected to the first output end ① of the signal conversion circuit <NUM>, and a second end of the third capacitor C3 is electrically connected to the first stub <NUM>. A first end of the fourth capacitor C4 is electrically connected to the second output end ② of the signal conversion circuit <NUM>, and a second end of the fourth capacitor C4 is electrically connected to the second stub <NUM>.

It can be learned from the foregoing that, when the antenna body <NUM> works in the first radiation mode RM1 under excitation of the first feed circuit <NUM> (including a balun chip in <FIG>), the first radiator <NUM> (including the first stub <NUM> and the second stub <NUM> in <FIG>) is used as a main radiator. In this case, when capacitance values of the third capacitor C3 and the fourth capacitor C4 in the first configuration circuit <NUM> are larger and the length S1 of the first stub <NUM> and the length S2 of the second stub <NUM> are greater, a resonance frequency of the antenna body <NUM> in the first radiation mode RM1 is lower; or when capacitance values of the third capacitor C3 and the fourth capacitor C4 in the first configuration circuit <NUM> are smaller and the length S1 of the first stub <NUM> and the length S2 of the second stub <NUM> are smaller, a resonance frequency of the antenna body <NUM> in the first radiation mode RM1 is higher.

In addition, in some other embodiments of this application, the first configuration circuit <NUM> may include a sixth capacitor C6, a seventh capacitor C7, and a fifth inductor L5 shown in <FIG>. A first end of the sixth capacitor C6 is electrically connected to the first output end ① of the signal conversion circuit <NUM>, and a second end of the sixth capacitor C6 is electrically connected to the first end of the third capacitor C3. A first end of the seventh capacitor C7 is electrically connected to the second output end ② of the signal conversion circuit <NUM>, and a second end of the seventh capacitor C7 is electrically connected to the first end of the fourth capacitor C4. A first end of the fifth inductor L5 is electrically connected to the second end of the sixth capacitor C6, and a second end of the fifth inductor L5 is electrically connected to the second end of the seventh capacitor C7. The sixth capacitor C6, the seventh capacitor C7, and the fifth inductor L5 may be configured to tune a bandwidth of the antenna body <NUM>. For example, when capacitance values of the sixth capacitor C6 and the seventh capacitor C7 are smaller and an inductance value of the fifth inductor L5 is larger, the bandwidth of the antenna body <NUM> is wider; or when capacitance values of the sixth capacitor C6 and the seventh capacitor C7 are larger and an inductance value of the fifth inductor L5 is smaller, the bandwidth of the antenna body <NUM> is narrower.

In addition, in some embodiments of this application, the second configuration circuit <NUM> may include a fifth capacitor C5 shown in <FIG>. A first end of the fifth capacitor C5 is electrically connected to the center of the second radiator <NUM>, and a second end of the fifth capacitor C5 is grounded to the reference ground GND of the PCB <NUM>. Alternatively, in some embodiments of this application, the second configuration circuit <NUM> may include a third inductor L3 shown in <FIG>. A first end of the third inductor L3 is electrically connected to the center of the second radiator <NUM>, and a second end of the third inductor L3 is grounded to the reference ground GND of the PCB <NUM>. Alternatively, in some embodiments of this application, as shown in <FIG>, the second configuration circuit <NUM> may include the fifth capacitor C5 and the third inductor L3. For ease of description, an example is used below for description in which the second configuration circuit <NUM> includes the fifth capacitor C5.

When the antenna body <NUM> works in the second radiation mode RM2 under excitation by the first feed circuit <NUM>, the second radiator <NUM> is used as a main radiator. When the length S3 of the second radiator <NUM> is greater, a resonance frequency of the antenna body <NUM> in the second radiation mode RM2 is lower; or when the length S3 of the second radiator <NUM> is smaller, the resonance frequency of the antenna body <NUM> in the second radiation mode RM2 is higher.

When the first feed circuit <NUM> excites the antenna body <NUM>, a radiation frequency of the antenna body <NUM> in the first radiation mode RM1 is enabled to cover an N41 frequency band (a frequency range of <NUM> to <NUM>) and a first half (<NUM> to <NUM>) of an N78 frequency band, and a radiation frequency of the antenna body <NUM> in the second radiation mode RM2 may be enabled to cover a second half (<NUM> to <NUM>) of an N78 frequency band. Based on this, the following describes a manner of setting a structure size of the antenna body <NUM>.

For example, in <FIG>, the length S1 of the first stub <NUM> and the length S2 of the second stub <NUM> may be approximately <NUM> ± <NUM>. The first gap H1 between the first stub <NUM> and the second stub <NUM> may be approximately <NUM> ± <NUM>. A length S3 of the second radiator <NUM> may be approximately <NUM> ± <NUM>. A material of the antenna chassis <NUM> (as shown in <FIG>) configured to support the second radiator <NUM> may be plastic. A dielectric constant of the plastic may be approximately <NUM>. In addition, the back cover <NUM> (as shown in <FIG>) of the electronic device <NUM> is located on the surface of the side that is of the second radiator <NUM> and that is away from the PCB <NUM>. A material of the back cover <NUM> may be glass, and a dielectric constant of the glass is approximately <NUM>. In addition, the length S5 of the cable <NUM> configured to electrically connect the second feed circuit <NUM> to the first radiator <NUM> may be approximately <NUM> ± <NUM>, and the width S6 of the cable <NUM> may be approximately <NUM> ± <NUM>.

Based on this, in <FIG>, parameters of elements in the second configuration circuit <NUM> and the first configuration circuit <NUM> are shown in Table <NUM>.

In this case, as shown in <FIG>, a curve ① is an S parameter curve of the antenna body <NUM> under excitation of the first feed circuit <NUM>. It can be seen that, in the curve ①, a resonance frequency at a point a1 is approximately <NUM>, a resonance frequency at a point a2 is approximately <NUM>, and a resonance frequency at a point a3 is approximately <NUM>. Therefore, it may be noted that the radiation frequency of the antenna body <NUM> in the first radiation mode RM1 may cover the N41 frequency band (a frequency range of <NUM> to <NUM>) and a first half of the N78 frequency band (<NUM> to <NUM>).

In addition, a resonance frequency at a point a4 in the curve ① is approximately <NUM>. Therefore, it may be indicated that a radiation frequency of the antenna body <NUM> in the second radiation mode RM2 may cover a second half (<NUM> to <NUM>) of the N78 frequency band. Therefore, under excitation of the first feed circuit <NUM>, radiation frequencies of the antenna body <NUM> used as the first antenna in the first radiation mode RM1 and the second radiation mode RM2 may cover the N41 frequency band (a frequency range of <NUM> to <NUM>) and the N78 frequency band (<NUM> to <NUM>).

In addition, under excitation of the first feed circuit <NUM>, as shown in <FIG>, it can be seen from an antenna radiation efficiency curve ① of the antenna body <NUM> that radiation efficiency of the antenna body <NUM> is approximately -<NUM> dB in the N41 frequency band (a frequency range of <NUM> to <NUM>) and the N78 frequency band (<NUM> to <NUM>). Therefore, the antenna body <NUM> has high radiation efficiency. It can be seen from a system efficiency curve ② of the antenna body <NUM> that, when the antenna body <NUM> is in the N41 frequency band (a frequency range of <NUM> to <NUM>) and the N78 frequency band (<NUM> to <NUM>), system efficiency of the antenna body <NUM> is higher than -<NUM> dB, which indicates high system efficiency.

In addition, under excitation of the second feed circuit <NUM> shown in <FIG>, when the antenna body <NUM> works in the third radiation mode RM3, the first radiator <NUM> (including the first stub <NUM> and the second stub <NUM> in <FIG>) is used as a main radiator. In this case, when the length S1 of the first stub <NUM> and the length S2 of the second stub <NUM> are greater, a resonance frequency of the antenna body <NUM> in the third radiation mode RM3 is lower; or when the length S1 of the first stub <NUM> and the length S2 of the second stub <NUM> are smaller, a resonance frequency of the antenna body <NUM> in the third radiation mode RM3 is higher. Under excitation of the second feed circuit <NUM>, when the antenna body <NUM> works in the fourth radiation mode RM4, when a capacitance value of the fifth capacitor C5 (or an inductance value of the third inductor L3) is larger, a resonance frequency of the antenna body <NUM> in the fourth radiation mode RM4 is lower; or when a capacitance value of the fifth capacitor C5 (or an inductance value of the third inductor L3) is smaller, a resonance frequency of the antenna body <NUM> in the fourth radiation mode RM4 is higher.

Based on this, when the structure size of the antenna body <NUM> remains unchanged, and a capacitance value of the fifth capacitor C5 is set to approximately <NUM> pF ± <NUM> pF, when the second feed circuit <NUM> excites the antenna body <NUM>, radiation frequencies of the antenna body <NUM> used as the second antenna in the third radiation mode RM3 and the fourth radiation mode RM4 may cover the N78 frequency band (<NUM> to <NUM>).

For example, as shown in <FIG>, a curve ② is an S parameter curve of the antenna body <NUM> under excitation of the second feed circuit <NUM>. It can be learned that a resonance frequency at a point b1 in the curve ② is approximately <NUM>, and is in the N78 frequency band (<NUM> to <NUM>).

In conclusion, when structures of the second configuration circuit <NUM> and the first configuration circuit <NUM> in the antenna apparatus <NUM> are set in a manner shown in <FIG>, the structure size of the antenna body <NUM> and the parameters of elements in the second configuration circuit <NUM> and the first configuration circuit <NUM> may be set, so that when the antenna body <NUM> can be used as the first antenna under excitation of the first feed circuit <NUM>, the radiation frequency of the antenna in the first radiation mode RM1 may cover the N41 frequency band, and the first half of the N78 frequency band, and the radiation frequency in the second radiation mode RM2 may cover the second half of the N78 frequency band. In addition, when the antenna body <NUM> can be used as the second antenna under excitation of the second feed circuit <NUM>, the radiation frequencies in the third radiation mode RM3 and the fourth radiation mode RM4 can cover the N78 frequency band. Isolation between the first antenna and the second antenna is high, and as shown in <FIG>, the isolation may be <NUM> dB (a triangle location in the figure).

In addition, under excitation of the second feed circuit <NUM>, as shown in <FIG>, it can be seen from an antenna radiation efficiency curve ① of the antenna body <NUM> that radiation efficiency of the antenna body <NUM> is higher than -<NUM> dB in the N78 frequency band (<NUM> to <NUM>). Therefore, the antenna body <NUM> has high radiation efficiency. It can be seen from a system efficiency curve ② of the antenna body <NUM> that, when the antenna body <NUM> is in the N78 frequency band (<NUM> to <NUM>), system efficiency of the antenna body <NUM> may be higher than -<NUM> dB, which indicates high system efficiency.

Claim 1:
An antenna apparatus (<NUM>), comprising:
a circuit board (<NUM>), comprising a first surface (P1) and a first side edge (P2); and
an antenna body (<NUM>), comprising a first radiator (<NUM>) and a second radiator (<NUM>), wherein
the first radiator comprises a first stub (<NUM>) and a second stub (<NUM>), and the first stub comprises a first end (A1) and a second end (A2), the second stub comprises a first end (B1) and a second end (B2), the first end of the first stub and the first end of the second stub are opposite to, but do not touch each other, a first gap (H1) is configured between the first end of the first stub and the first end of the second stub, the first stub and the second stub are located on the first side edge of the circuit board, a second gap (H2) is configured between the first stub and the first side edge, and the second gap is configured between the second stub and the first side edge;
the second radiator is located on the circuit board, a third gap (H3) is configured between the second radiator and the first surface of the circuit board, a vertical projection of the second radiator is located on the first surface, and the second end of the first stub and the second end of the second stub are electrically connected to a reference ground of the circuit board separately; and
the first radiator is indirectly coupled to the second radiator.