Patent Description:
For convenience of carrying or cost saving, a size of a communications device (especially a terminal) such as a mobile phone, a tablet computer, or a base station is designed to be smaller with smaller internal space for installing an antenna. It has become a trend to design the antenna structure to be a low-profile structure and package the antenna structure in a circuit board. However, because a thickness of the circuit board is relatively small, when the antenna structure is packaged in the circuit board with the relatively small thickness, a thickness of the antenna structure needs to be made quite small. It is common sense that a smaller thickness (that is, a smaller profile) of the antenna structure indicates a narrower bandwidth. Therefore, how to expand a bandwidth of the antenna structure with a low profile becomes an urgent problem to be resolved.

For example, <FIG> is a low-profile antenna structure in a conventional technology. As shown in <FIG>, the antenna structure includes a signal reference ground <NUM>, a radiation patch <NUM>, and a feed probe <NUM>. The radiation patch <NUM> and the signal reference ground <NUM> are stacked and spaced apart. An air cavity <NUM> is formed between the radiation patch <NUM> and the signal reference ground <NUM>. One end of the feed probe <NUM> is a signal input end, and the other end extends into the air cavity <NUM>. A part of the feed probe <NUM> that extends into the air cavity <NUM> can feed the radiation patch <NUM> in a coupled feeding manner. The air cavity <NUM> is filled with air, and the air has a dielectric constant approaching <NUM>, which is smaller than that of other filling mediums. Therefore, the bandwidth can be expanded to a certain extent. However, it is rather difficult to arrange the air cavity in the circuit board. Further, it is tested by experiments that under a condition that a relative bandwidth is greater than <NUM>% in the antenna structure, the thickness of the antenna structure shown in <FIG> is <NUM> times a wavelength. Because the thickness of the circuit board generally does not exceed <NUM> times the wavelength, the antenna structure cannot be packaged in a circuit board. <CIT> discloses a printed-circuit antenna element which is capacitively coupled to a feedline and which produces linear or circular polarization over a wide frequency band. <CIT> discloses a patch antenna suitable for portable radiotelephones. <CIT> discloses a polarized antenna including more than two feeding parts. <CIT> discloses an oscillator made by integrating an antenna with a gain medium. <CIT> discloses a dual polarized microstrip patch antenna based on L-type probe feed. <NPL> discloses a feeding structure for patch antennas.

Embodiments of this application provide an antenna structure, a circuit board with an antenna structure, and a communications device, to lower a profile of the antenna structure while meeting a bandwidth of the antenna structure, so that the antenna structure can be packaged in a circuit board in the communications device.

According to a first aspect, some embodiments of this application provide an antenna structure. The antenna structure includes a signal reference ground, a first radiation patch, a second radiation patch, and at least one feed probe. The first radiation patch and the signal reference ground are stacked and spaced apart. The second radiation patch is located on a side that is of the first radiation patch and that is away from the signal reference ground, and the second radiation patch and the first radiation patch are stacked and spaced apart. The at least one feed probe is located between the first radiation patch and the signal reference ground. Each feed probe includes a first end and a second end that are opposite to each other. The first end is a signal input end, and a projection position of the first end on a plane on which the signal reference ground is located is outside a projection area of the first radiation patch on the plane on which the signal reference ground is located. A projection position of the second end on the plane on which the signal reference ground is located is inside the projection area of the first radiation patch on the plane on which the signal reference ground is located, and the second end is electrically connected to the signal reference ground. A part that is of each feed probe and that is face-to-face with the first radiation patch is capable of feeding the first radiation patch and the second radiation patch in a coupled feeding manner. A length of the part that is of each feed probe and that is face-to-face with the first radiation patch is <NUM> to <NUM> times a wavelength. When the length of the part that is of the feed probe and that is face-to-face with the first radiation patch falls within this range, the antenna structure has a relatively large bandwidth and a relatively low profile.

The antenna structure provided in embodiments of this application includes the signal reference ground, the first radiation patch, the second radiation patch, and the at least one feed probe. The first radiation patch and the signal reference ground are stacked and spaced apart. The second radiation patch is located on the side that is of the first radiation patch and that is away from the signal reference ground, and the second radiation patch and the first radiation patch are stacked and spaced apart. The at least one feed probe is located between the first radiation patch and the signal reference ground. Each feed probe includes the first end and the second end that are opposite to each other. The projection position of the first end on the plane on which the signal reference ground is located is outside the projection area of the first radiation patch on the plane on which the signal reference ground is located. The projection position of the second end on the plane on which the signal reference ground is located is inside the projection area of the first radiation patch on the plane on which the signal reference ground is located. The part that is of each feed probe and that is face-to-face with the first radiation patch is capable of feeding the first radiation patch and the second radiation patch in a coupled feeding manner. Therefore, when one feed probe performs feeding, the two radiation patches (namely, the first radiation patch and the second radiation patch) are passed, generating two resonances. Further, because the second end of the feed probe is electrically connected to the signal reference ground, impedance matching performance between the two resonances can be improved, thereby increasing an impedance bandwidth. In other words, a profile of the antenna structure can be lowered while a same relative bandwidth is met, so that the antenna structure can be packaged in a circuit board in the communications device.

Optionally, the projection area of the first radiation patch on the plane on which the signal reference ground is located is a first projection area; a projection area of the second radiation patch on the plane on which the signal reference ground is located is a second projection area; and a center of the first projection area coincides with a center of the second projection area. As a result, a distance between an edge of the first projection area and an edge of the second projection area is relatively short, and a length of a part that is of the feed probe and that is used to feed the first radiation patch is approximately equal to a length of a part that is of the feed probe and that is used to feed the second radiation patch.

Optionally, the at least one feed probe includes two feed probes. A projection area, on the plane on which the signal reference ground is located, of a part that is of one of the two feed probes and that is face-to-face with the first radiation patch is a third projection area. The third projection area is perpendicular to a first axis that passes through the center of the first projection area and that is on the plane on which the signal reference ground is located, and the third projection area is axially symmetrical with respect to the first axis. A projection area, on the plane on which the signal reference ground is located, of a part that is of the other one of the two feed probes and that is face-to-face with the first radiation patch is a fourth projection area. The fourth projection area is perpendicular to a second axis that passes through the center of the first projection area and that is on the plane on which the signal reference ground is located, and the fourth projection area is axially symmetrical with respect to the second axis. The first axis is perpendicular to the second axis. In this way, dual polarization of the antenna structure may be implemented by using the two feed probes, so that the antenna structure can simultaneously transmit or receive two signals, thereby increasing transmitting and receiving capacities of the antenna structure, ensuring relatively high isolation between two polarization directions, and avoiding cross interference.

Optionally, both the first radiation patch and the second radiation patch are in the shape of a square. In this way, when the antenna structures form an array, cross interference between two adjacent antenna structures is relatively weak.

According to a second aspect, some embodiments of this application provide a circuit board with an antenna structure, where the circuit board with an antenna structure includes a circuit board and at least one antenna structure disposed on the circuit board, and the antenna structure is the antenna structure according to any one of the foregoing technical solutions.

The antenna structure in the circuit board with an antenna structure provided in embodiments of this application is the same as an antenna structure provided in the embodiment of the antenna structure according to any one of the foregoing technical solutions. Therefore, the two antenna structures can resolve a same technical problem and achieve a same expected effect.

Optionally, the antenna structure is fabricated on a surface of the circuit board.

Optionally, the circuit board includes a first dielectric layer, a second dielectric layer, and a third dielectric layer that are sequentially stacked. A signal reference ground is a metal layer disposed on a surface that is of the first dielectric layer and that is away from the second dielectric layer. At least one feed probe is a metal layer disposed on a surface that is of the first dielectric layer and that faces the second dielectric layer, or the at least one feed probe is a metal layer disposed on a surface that is of the second dielectric layer and that faces the first dielectric layer. A first radiation patch is a metal layer disposed on a surface that is of the second dielectric layer and that is away from the first dielectric layer. A second radiation patch is a metal layer disposed on a surface that is of the third dielectric layer and that is away from the second dielectric layer. In this way, the antenna structure is packaged in the circuit board by using the existing dielectric layers in the circuit board, and the antenna structure does not need to occupy an external space of the circuit board. This facilitates a miniaturized design for a communications device. In addition, because surface precision of the dielectric layer is relatively high, using the dielectric layer as a bearing medium helps improve size precision of each structure in the antenna structure.

Optionally, the first dielectric layer, the second dielectric layer, and the third dielectric layer are press-fitted by using a thermo compression process.

Optionally, the at least one feed probe is a metal layer disposed on a surface that is of the first dielectric layer and that faces the second dielectric layer, a metallized via hole is provided at a location of the first dielectric plate layer corresponding to a second end of each feed probe, the metallized via hole penetrates the first dielectric layer, and the second end of the feed probe is electrically connected to the signal reference ground through the metallized via hole. Providing the metallized via hole on the dielectric layer has relatively high precision, low costs, and is easy to implement.

Optionally, the at least one antenna structure includes a plurality of antenna structures, and an array of the plurality of antenna structures is disposed on the circuit board. In this way, a relatively large antenna gain can be obtained by using the array of the antenna structures.

According to a third aspect, some embodiments of this application provide a communications device. The communications device includes a housing and a circuit board disposed in the housing. The circuit board is the circuit board with an antenna structure according to any one of the foregoing technical solutions.

The circuit board in the communications device provided in this embodiment of this application is the same as a circuit board with an antenna structure provided in the embodiment of the circuit board with an antenna structure according to any one of the foregoing technical solutions. Therefore, the two circuit boards can resolve a same technical problem and achieve a same expected effect.

Optionally, the communications device is a terminal.

<NUM>: signal reference ground; <NUM>: radiation patch; <NUM>: feed probe; <NUM>: air cavity; <NUM>: housing; <NUM>: circuit board with an antenna structure; <NUM>: circuit board; <NUM>: first dielectric layer; <NUM>: second dielectric layer; <NUM>: third dielectric layer; <NUM>: antenna structure; <NUM>: signal reference ground; <NUM>: first radiation patch; <NUM>: second radiation patch; <NUM>: feed probe; <NUM>: first end of the feed probe; <NUM>: second end of the feed probe; <NUM>: metallized via hole.

The terms "first" and "second" in embodiments of this application are merely intended for a purpose of description, and shall not be understood as an indication or implication of relative importance or 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 features.

For convenience of carrying or cost saving, a size of a communications device such as a mobile phone, a tablet computer, or a base station, especially a terminal such as a mobile phone or a tablet computer is designed to be smaller with smaller internal space for installing an antenna. It has become a trend to design the antenna structure to be a low-profile structure and package the antenna structure in a circuit board. However, because a thickness of the circuit board is relatively small, when the antenna structure is packaged in the circuit board with a relatively small thickness, a profile of the antenna structure needs to be made quite small. However, a smaller profile of the antenna structure indicates a narrower bandwidth. Therefore, how to expand a bandwidth of the antenna structure with a low profile while lowering the profile of the antenna structure becomes an urgent problem to be resolved.

To resolve the foregoing problem, <FIG> is provided, which is a schematic diagram of a structure of a communications device according to some embodiments of this application. As shown in <FIG>, the communications device includes a housing <NUM> and a circuit board <NUM> disposed in the housing <NUM>, and the circuit board <NUM> is a circuit board with an antenna structure. The communications device includes but is not limited to a terminal or a base station. In some embodiments, the communications device is a terminal such as a mobile phone or a tablet computer.

<FIG> is a schematic diagram of a structure of a circuit board <NUM> with an antenna structure according to some embodiments of this application. As shown in <FIG>, the circuit board <NUM> with an antenna structure includes a circuit board <NUM> and at least one antenna structure <NUM> disposed on the circuit board <NUM>.

<FIG> are schematic diagrams of a structure of an antenna structure <NUM> according to some embodiments of this application. As shown in <FIG>, the antenna structure <NUM> includes a signal reference ground <NUM>, a first radiation patch <NUM>, a second radiation patch <NUM>, and at least one feed probe <NUM>. The first radiation patch <NUM> and the signal reference ground <NUM> are stacked and spaced apart. The second radiation patch <NUM> is located on a side that is of the first radiation patch <NUM> and that is away from the signal reference ground <NUM>, and the second radiation patch <NUM> and the first radiation patch <NUM> are stacked and spaced apart. The at least one feed probe <NUM> is located between the first radiation patch <NUM> and the signal reference ground <NUM>. As shown in <FIG>, each feed probe <NUM> includes a first end <NUM> and a second end <NUM> that are opposite to each other. The first end <NUM> is a signal input end. As shown in <FIG>, a projection position a of the first end <NUM> on a plane on which the signal reference ground <NUM> is located is outside a projection area A of the first radiation patch <NUM> on the plane on which the signal reference ground <NUM> is located. A projection position b of the second end <NUM> on the plane on which the signal reference ground <NUM> is located is inside the projection area A of the first radiation patch <NUM> on the plane on which the signal reference ground <NUM> is located. As shown in <FIG>, the second end <NUM> is electrically connected to the signal reference ground <NUM>. A part 224a that is of each feed probe <NUM> and that is face-to-face with the first radiation patch <NUM> is capable of feeding the first radiation patch <NUM> and the second radiation patch <NUM> in a coupled feeding manner.

It should be noted that the part 224a that is of the feed probe <NUM> and that is face-to-face with the first radiation patch <NUM> is a part that is of a projection area of the feed probe <NUM> on the plane on which the signal reference ground <NUM> is located and that is within the projection area A of the first radiation patch <NUM> on the plane on which the signal reference ground <NUM> is located.

The antenna structure <NUM> provided in embodiments of this application, as shown in <FIG>, includes the signal reference ground <NUM>, the first radiation patch <NUM>, the second radiation patch <NUM>, and the at least one feed probe <NUM>. The first radiation patch <NUM> and the signal reference ground <NUM> are stacked and spaced apart. The second radiation patch <NUM> is located on the side that is of the first radiation patch <NUM> and that is away from the signal reference ground <NUM>, and the second radiation patch <NUM> and the first radiation patch <NUM> are stacked and spaced apart. The at least one feed probe <NUM> is located between the first radiation patch <NUM> and the signal reference ground <NUM>. As shown in <FIG>, each feed probe <NUM> includes the first end <NUM> and the second end <NUM> that are opposite to each other. The first end <NUM> is a signal input end. As shown in <FIG>, the projection position a of the first end <NUM> on the plane on which the signal reference ground <NUM> is located is outside the projection area A of the first radiation patch <NUM> on the plane on which the signal reference ground <NUM> is located. The projection position b of the second end <NUM> on the plane on which the signal reference ground <NUM> is located is inside the projection area A of the first radiation patch <NUM> on the plane on which the signal reference ground <NUM> is located. As shown in <FIG>, a part that is of each feed probe <NUM> and that is face-to-face with the first radiation patch <NUM> is capable of feeding the first radiation patch <NUM> and the second radiation patch <NUM> in a coupled feeding manner. When one feed probe <NUM> performs feeding, the two radiation patches (namely, the first radiation patch <NUM> and the second radiation patch <NUM>) are passed, generating two resonances. Further, because the second end <NUM> of the feed probe is electrically connected to the signal reference ground <NUM> (as shown in <FIG>), impedance matching performance between the two resonances can be improved, thereby increasing an impedance bandwidth. In other words, a profile of the antenna structure <NUM> can be lowered while a same relative bandwidth is met, so that the antenna structure <NUM> can be packaged in a circuit board in a communications device.

The antenna structure <NUM> in the circuit board <NUM> with an antenna structure provided in this embodiment of this application is the same as an antenna structure provided in the embodiment of the antenna structure <NUM>. Therefore, the two antenna structures can resolve a same technical problem and achieve a same expected effect.

The circuit board <NUM> in the communications device provided in this embodiment of this application is the same as a circuit board with an antenna structure provided in the embodiment of the circuit board <NUM> with an antenna structure. Therefore, the two circuit boards can resolve a same technical problem and achieve a same expected effect.

The antenna structure <NUM> may be fabricated on a surface of the circuit board <NUM>, or may be packaged in the circuit board <NUM>. This is not specifically limited herein.

In some embodiments, <FIG> is a schematic diagram of a structure of a circuit board with an antenna structure according to some other embodiments of this application. As shown in <FIG>, the circuit board <NUM> includes a first dielectric layer <NUM>, a second dielectric layer <NUM>, and a third dielectric layer <NUM> that are sequentially stacked. A signal reference ground <NUM> is a metal layer disposed on a surface that is of the first dielectric layer <NUM> and that is away from the second dielectric layer <NUM>. At least one feed probe <NUM> is a metal layer disposed on a surface that is of the first dielectric layer <NUM> and that faces the second dielectric layer <NUM>, or the at least one feed probe <NUM> is a metal layer disposed on a surface that is of the second dielectric layer <NUM> and that faces the first dielectric layer <NUM>. A first radiation patch <NUM> is a metal layer disposed on a surface that is of the second dielectric layer <NUM> and that is away from the first dielectric layer <NUM>. A second radiation patch <NUM> is a metal layer disposed on a surface that is of the third dielectric layer <NUM> and that is away from the second dielectric layer <NUM>. In this way, the antenna structure <NUM> is packaged in the circuit board <NUM> by using the existing dielectric layers in the circuit board <NUM>, and the antenna structure <NUM> does not need to occupy an external space of the circuit board <NUM>. This facilitates a miniaturized design for a communications device. In addition, because surface precision of the dielectric layer is relatively high, using the dielectric layer as a bearing medium helps improve size precision of each structure in the antenna structure <NUM>.

In the foregoing embodiment, the first dielectric layer <NUM>, the second dielectric layer <NUM>, and the third dielectric layer <NUM> are press-fitted by using a thermo compression process.

In addition to the first dielectric layer <NUM>, the second dielectric layer <NUM>, and the third dielectric layer <NUM>, the circuit board may further include another dielectric layer. This is not specifically limited herein.

To implement electrical connection between the second end <NUM> of the feed probe <NUM> and the signal reference ground <NUM>, in some embodiments, as shown in <FIG>, the at least one feed probe <NUM> is a metal layer disposed on a surface that is of the first dielectric layer <NUM> and that faces the second dielectric layer <NUM>, and a metallized via hole <NUM> is provided at a location of the first dielectric plate layer <NUM> corresponding to the second end <NUM> of each feed probe <NUM>. The metallized via hole <NUM> penetrates the first dielectric layer <NUM>. The second end <NUM> of the feed probe <NUM> is electrically connected to the signal reference ground <NUM> through the metallized via hole <NUM>. Providing the metallized via hole <NUM> on the dielectric layer has relatively high precision, low costs, and is easy to implement.

To obtain a relatively large antenna bandwidth, in some embodiments, as shown in <FIG>, a length d of the part that is of each feed probe <NUM> and that is face-to-face with the first radiation patch <NUM> is <NUM> to <NUM> times a wavelength. When the length of the part that is of the feed probe <NUM> and that is face-to-face with the first radiation patch <NUM> falls within this range, the antenna structure <NUM> has a relatively large bandwidth and a relatively low profile.

The part that is of the feed probe <NUM> and that is face-to-face with the first radiation patch <NUM> is a part that is of the feed probe <NUM> and that is used to feed the first radiation patch <NUM>. A part that is of the feed probe <NUM> and that is face-to-face with the second radiation patch <NUM> is a part that is of the feed probe <NUM> and that is used to feed the second radiation patch <NUM>. To ensure that a length of the part that is of the feed probe <NUM> and that is used to feed the first radiation patch <NUM> is approximately equal to a length of the part that is of the feed probe <NUM> and that is used to feed the second radiation patch <NUM>, in some embodiments, as shown in <FIG> and <FIG>, a projection area of the first radiation patch <NUM> on the plane on which the signal reference ground <NUM> is located is the first projection area A, and a projection area of the second radiation patch <NUM> on the plane on which the signal reference ground <NUM> is located is the second projection area B. The center O of the first projection area A coincides with the center O of the second projection area B. As a result, a distance between an edge of the first projection area A and an edge of the second projection area B is relatively short, and the length of the part that is of the feed probe <NUM> and that is used to feed the first radiation patch <NUM> is approximately equal to the length of the part that is of the feed probe <NUM> and that is used to feed the second radiation patch <NUM>.

To increase transmitting and receiving capacities of the antenna structure <NUM>, according to the invention, as shown in <FIG> and <FIG>, the at least one feed probe <NUM> includes two feed probes <NUM>. A projection area, on the plane on which the signal reference ground <NUM> is located, of a part 224a that is of one of the two feed probes <NUM> and that is face-to-face with the first radiation patch <NUM> is a third projection area C1. The third projection area C1 is perpendicular to a first axis l<NUM> that passes through the center O of the first projection area A and that is on the plane on which the signal reference ground <NUM> is located, and the third projection area C1 is axially symmetrical with respect to the first axis l<NUM>. A projection area, on the plane on which the signal reference ground <NUM> is located, of a part 224a that is of the other one of the two feed probes <NUM> and that is face-to-face with the first radiation patch <NUM> is a fourth projection area C2. The fourth projection area C2 is perpendicular to a second axis l<NUM> that passes through the center O of the first projection area A and that is on the plane on which the signal reference ground <NUM> is located, and the fourth projection area C2 is axially symmetrical with respect to the second axis l<NUM>. The first axis l<NUM> is perpendicular to the second axis l<NUM>. In this way, dual polarization of the antenna structure <NUM> may be implemented by using the two feed probes <NUM>, so that the antenna structure <NUM> can simultaneously transmit or receive two signals, thereby increasing transmitting and receiving capacities of the antenna structure <NUM>, ensuring relatively high isolation between two polarization directions, and avoiding cross interference.

Optionally, both the first radiation patch <NUM> and the second radiation patch <NUM> are in the shape of a square. In this way, when the antenna structures <NUM> form an array, cross interference between two adjacent antenna structures <NUM> is relatively weak.

To verify practicability of the dual-polarized antenna structure shown in <FIG>, the following operations are performed: Only a port <NUM> (namely, a first end of one feed probe <NUM>) in <FIG> is excited; for an obtained input return loss curve, refer to S11 in <FIG>; for electric field distribution on the first radiation patch <NUM> at a frequency of <NUM>, refer to <FIG>; for electric field distribution on the second radiation patch <NUM> at a frequency of <NUM>, refer to <FIG>. Only a port <NUM> (namely, a first end of the other feed probe <NUM>) in <FIG> is excited; for an obtained input return loss curve, refer to S22 in <FIG>; for obtained isolation between the port <NUM> and the port <NUM>, refer to S12 in <FIG>. It can be learned from <FIG>, <FIG>, and <FIG> that, when feeding is performed through any one of the feed probes <NUM>, the two radiation patches (that is, the first radiation patch <NUM> and the second radiation patch <NUM>) can both generate two resonances. In addition, when a return relative bandwidth is <NUM>%, isolation between the port <NUM> and the port <NUM> is below -<NUM> dB. In other words, the bandwidth is relatively large and the isolation is relatively good. Therefore, the dual-polarized antenna structure can be used.

To obtain a relatively large antenna gain, in some embodiments, as shown in <FIG>, at least one antenna structure <NUM> on a circuit board includes a plurality of antenna structures <NUM>, and an array of the plurality of antenna structures <NUM> is disposed on the circuit board. In this way, a relatively large antenna gain can be obtained by using the array of the antenna structures <NUM>.

To verify practicability of the antenna structure array shown in <FIG> in which a distance between two adjacent antenna structures <NUM> is shown as <NUM>, the following operations are performed: Only a port <NUM> in <FIG> is excited; for an obtained input return loss curve, refer to S11 in <FIG>; for obtained isolation between the port <NUM> and a port <NUM>, refer to S12 in <FIG>; for obtained isolation between the port <NUM> and a port <NUM>, refer to S13 in <FIG>. It can be learned from <FIG> that, in an array including the antenna structures <NUM>, a return relative bandwidth greater than <NUM>% i, isolation of adjacent co-polarized ports (that is, S13) is below -<NUM> dB; isolation of heteropolar ports (that is, S12) is below -<NUM> dB. In other words, the bandwidth is relatively large and the isolation is relatively good. Therefore, the array including the antenna structures can be used.

In the descriptions of this specification, the specific features, structures, materials, or characteristics may be combined in an appropriate manner in any one or more of the embodiments or examples.

Claim 1:
An antenna structure, comprising:
a signal reference ground (<NUM>);
a first radiation patch (<NUM>), wherein the first radiation patch and the signal reference ground are stacked and spaced apart;
a second radiation patch (<NUM>), wherein the second radiation patch is located on a side that is of the first radiation patch and that is away from the signal reference ground, and the second radiation patch and the first radiation patch are stacked and spaced apart; and
at least one feed probe (<NUM>), wherein the at least one feed probe is located between the first radiation patch and the signal reference ground, each feed probe comprises a first end (<NUM>) and a second end (<NUM>) that are opposite to each other, the first end is a signal input end, a projection position of the first end on a plane on which the signal reference ground is located is outside a projection area of the first radiation patch on the plane on which the signal reference ground is located, a projection position of the second end on the plane on which the signal reference ground is located is inside the projection area of the first radiation patch on the plane on which the signal reference ground is located, the second end is electrically connected to the signal reference ground, and a part that is of each feed probe and that is face-to-face with the first radiation patch is capable of feeding the first radiation patch and the second radiation patch in a coupled feeding manner, wherein a length of the part that is of each feed probe and that is face-to-face with the first radiation patch is <NUM> to <NUM> times a wavelength of the antenna structure.