Patent Description:
With developments of electronic technology, functions of electronic devices such as smart phones are becoming more and more abundant, and their appearance is gradually becoming thinner and lighter. In order to pursue high-quality appearance and touch, metal casings are widely used. <CIT> proposes an antenna device comprising a housing, an antenna element disposed in the housing, a conductive element facing the antenna element and electromagnetically coupled to the antenna element. <CIT> proposes a mobile wireless terminal comprising a housing, a cover removably attached to the housing, and an antenna device disposed inside the housing. <CIT> proposes a selectively metalized article comprising a substrate, and a conductive ink spray-applied to a non-planar region of the substrate, wherein the conductive ink is at least a portion of an antenna.

Embodiments of the present application provide an electronic device and a method for fabricating an antenna radiator. The electronic device can improve a radiation bandwidth and an efficiency of the antenna without increasing a thickness, the method for fabricating the antenna radiator is simple, and the antenna radiator has less requirements on a material of a substrate.

A first aspect of the present disclosure provides an electronic device according to claim <NUM>.

A second aspect of the present disclosure provides a method according to claim <NUM> for fabricating an electronic device.

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings to be used in the descriptions of the embodiments or the related art will be briefly introduced below. Obviously, the drawings described below only illustrate some embodiments of the present application, and other drawings can be obtained according to these drawings without any creative effort for those skilled in the art.

The embodiments illustrated in <FIG>, <FIG> and <FIG> are according to the present invention. The other embodiments are exemplary and useful for the understanding of the invention.

Embodiments of the present disclosure are described in detail below. Embodiments described below are exemplary, and are only used to explain the present disclosure, and should not be construed as limiting the present disclosure. Where specific techniques or conditions are not indicated in the examples, the procedures shall be carried out in accordance with the techniques or conditions described in the literature in the field or in accordance with the product specification.

An embodiment of the present application provides an electronic device <NUM>. The electronic device <NUM> can be a smart phone, a tablet computer, etc., and can also be a game device, an augmented reality (AR) device, a car device, a data storage device, an audio playback device, a video playback device, a notebook computer, a desktop computing device, etc..

Referring to <FIG>, <FIG> is a structural schematic diagram of an electronic device provided by an embodiment of this application, <FIG> is an exploded view of the electronic device shown in <FIG>, and <FIG> is the electronic device in <FIG> along a direction P1-P2, and <FIG> is a structural schematic diagram of a first antenna radiator shown in <FIG>. The electronic device <NUM> includes a display screen <NUM>, a cover <NUM>, a middle frame <NUM>, a circuit board <NUM>, a support <NUM>, a battery <NUM>, a back cover <NUM>, a first antenna radiator <NUM> and a second antenna radiator <NUM>.

The display screen <NUM> can be used to display information such as images and texts. The display screen <NUM> can be a liquid crystal display (LCD) or an organic light-emitting diode display (OLED).

Herein, the display screen <NUM> can be installed on the middle frame <NUM> and connected to the back cover <NUM> through the middle frame <NUM> to form a display surface of the electronic device <NUM>. The display screen <NUM> serves as a front casing of the electronic device <NUM>, and forms a housing of the electronic device <NUM> together with the back cover <NUM>, which is configured to accommodate other electronic elements of the electronic device <NUM>. For example, the housing may be configured to accommodate electronic elements such as a processor, a memory, one or more sensors, and a camera module of the electronic device <NUM>.

The display screen <NUM> may include a display area and a non-display area. Herein, the display area performs a display function of the display screen <NUM> and is configured to display information such as images and texts. No information is displayed in the non-display area. The non-display area can be configured to set up electronic elements such as camera modules and touch electrodes of the display screen.

The display screen <NUM> may be a full screen. At this time, the display screen <NUM> can display information in a full screen, so that the electronic device <NUM> has a larger screen-to-body ratio. The display screen <NUM> only includes a display area and does not include a non-display area, or an area of the non-display area is relatively small for the user. At this time, electronic elements such as cameras and proximity sensors in the electronic device <NUM> can be hidden under the display screen <NUM>, and the fingerprint recognition module of the electronic device <NUM> can be arranged on the back cover <NUM> of the electronic device <NUM>.

The cover <NUM> may be installed on the middle frame <NUM>, and the cover <NUM> covers the display screen <NUM> to protect the display screen <NUM> from being scratched or damaged by water. Herein, the cover <NUM> may be a transparent glass cover, so that a user can observe contents displayed on the display screen <NUM> through the cover <NUM>. The cover <NUM> may be a glass cover made of sapphire.

The middle frame <NUM> may have a thin plate or sheet-like structure, or a hollow frame structure. The middle frame <NUM> is configured to provide a supporting function for the electronic device or the electronic elements in the electronic device <NUM> so as to install the electronic device and the electronic elements in the electronic device <NUM> together. For example, electronic elements such as a camera, a receiver, a circuit board <NUM>, and a battery <NUM> of the electronic device <NUM> can all be mounted on the middle frame <NUM> for fixing.

The circuit board <NUM> may be installed on the middle frame <NUM>. The circuit board <NUM> may be the main board of the electronic device <NUM>. The circuit board <NUM> may include a signal source <NUM> and a grounding point <NUM>. The grounding point <NUM> may achieve grounding of the circuit board <NUM>. The signal source <NUM> may be electrically connected to a feeding terminal of the antenna radiator so that the antenna radiator can radiate wireless signals. The circuit board <NUM> can be integrated with one, two or more electronic elements such as a microphone, a speaker, a receiver, a headphone interface, a universal serial bus interface (USB interface), a camera assembly, a distance sensor, an ambient light sensor, a gyroscope, and a processor. At the same time, the display screen <NUM> may be electrically connected to the circuit board <NUM>.

Herein, the circuit board <NUM> is provided with a display control circuit. The display control circuit outputs electrical signals to the display screen <NUM> to control the display screen <NUM> to display information.

The support <NUM> is located between the circuit board <NUM> and the middle frame <NUM>. That is, the support <NUM> is located on a side of the circuit board <NUM> away from the display screen <NUM>. The support <NUM> covers the circuit board <NUM>, so the circuit board <NUM> is protected when the circuit board <NUM> is installed on the middle frame <NUM>.

The support <NUM> may be made of materials with insulating properties, such as insulating plastic, insulating ceramics, insulating glass, etc., to avoid interferences with electronic elements on the circuit board <NUM>.

The battery <NUM> may be installed on the middle frame <NUM>. At the same time, the battery <NUM> is electrically connected to the circuit board <NUM> so that the battery <NUM> can supply power to the electronic device <NUM>. Herein, the circuit board <NUM> may be provided with a power management circuit. The power management circuit is configured to distribute a voltage provided by the battery <NUM> to various electronic elements in the electronic device <NUM>.

Herein, the battery <NUM> may be a rechargeable battery. For example, the battery <NUM> may be a lithium-ion battery.

The back cover <NUM> is located on a side of the support <NUM> away from the circuit board <NUM>. That is, the back cover <NUM> is located at an outermost portion of the electronic device <NUM> and is configured to form an outer contour of the electronic device <NUM>. The back cover <NUM> may be integrally formed. During a formation process of the back cover <NUM>, a rear camera hole, a fingerprint recognition module mounting hole, and other structures may be formed on the back cover <NUM>.

The back cover <NUM> may be a metal shell, such as magnesium alloy, stainless steel and other metals. It should be noted that the material of the back cover <NUM> in the embodiment of the present application is not limited thereto, and other materials may also be used. For example, the back cover <NUM> may be a plastic shell. For example, the back cover <NUM> may be a ceramic case. For example, the back cover <NUM> may include a plastic portion and a metal portion, and the back cover <NUM> may be a shell structure in which cooperates metal with plastic. Specifically, the metal portion may be formed by, for example, first forming a magnesium alloy substrate by injection molding, and then injecting plastic on the magnesium alloy substrate to form a plastic substrate, thereby forming a complete shell structure.

The first antenna radiator <NUM> may be located on the support <NUM>. In addition, the first antenna radiator <NUM> may be provided with a feeding terminal <NUM> and a ground terminal <NUM>, and the ground terminal <NUM> is electrically connected to the ground point <NUM> on the circuit board <NUM> to form a ground connection of the first antenna radiator <NUM>. Specifically, the ground terminal <NUM> may be connected to the ground point <NUM> on the circuit board <NUM> through a ground wire, a ground spring sheet, or the like. The feeding terminal801 of the first antenna radiator <NUM> is electrically connected to the signal source <NUM> on the circuit board <NUM>, so that the first antenna radiator <NUM> is electrically connected with a radio frequency circuit on the circuit board <NUM>, thereby realizing functions of receiving and sending radio frequency signals of the first radiator <NUM> to radiate wireless signals of a first wavelength to an outside of the electronic device <NUM>. The first wavelength can be adjusted according to the frequency of the radio frequency circuit, so that the first antenna radiator <NUM> can radiate a wavelength that meets the communication requirements. The feeding terminal801 of the first antenna radiator <NUM> may be connected to the signal source <NUM> on the circuit board <NUM> through a feeding point spring sheet, a feeding wire, and the like. For example, one end of the feeding point spring sheet is connected to the feeding terminal801 of the first antenna radiator <NUM>, and the other end of the feeding point spring sheet is connected to the signal source <NUM> of the circuit board <NUM>. The feeding point spring sheet is configured to connect the first antenna radiator <NUM> and the circuit board <NUM>, and the elastic deformation performance of the feed point shrapnel can be configured to make the first antenna radiator <NUM> and the circuit board <NUM> difficult to separate and ensure the electrical properties between connections thereof.

Herein, the first antenna radiator <NUM> may have a sheet structure. That is, a thickness of the first antenna radiator <NUM> may be very thin. For example, the first antenna radiator <NUM> may be a flat panel structure, and the feeding terminal <NUM> and the ground terminal <NUM> are located on the surface of the first antenna radiator <NUM> of the flat panel structure.

Specifically, the feeding terminal <NUM> and the ground terminal <NUM> may be located on a surface of the first antenna radiator <NUM> facing the circuit board <NUM>, and the signal source <NUM> and the ground point <NUM> on the circuit board <NUM> may be connected with the feeding terminal <NUM> and the ground terminal <NUM> respectively through the through holes defined on the support <NUM>. The feeding terminal <NUM> and the grounding end <NUM> can also be located on the surface of the first antenna radiator <NUM> facing the back cover <NUM>, and the signal source <NUM> and the grounding point <NUM> on the circuit board <NUM> may be electrically connected to the feeding terminal801 and the grounding end <NUM> respectively through the through holes defined on the support <NUM> and the grooves defined on the first antenna radiator <NUM>.

Herein, the first antenna radiator <NUM> may include a first end <NUM> and a second end <NUM>, the ground terminal <NUM> may be located at the first end <NUM> of the first antenna radiator <NUM>, and the feed end <NUM> may be located between the first end <NUM> and the second end <NUM> of the body of the first antenna radiator <NUM>.

In the electronic device <NUM> of the embodiment of the present application, when the feeding terminal <NUM> of the first antenna radiator <NUM> is electrically connected to the signal source <NUM> of the circuit board <NUM> and forms a current loop, the current loop is able to form an oscillating electric field formed between the first end <NUM> and the second end <NUM> of the body of the first antenna radiator <NUM>. When the second antenna radiator <NUM> covers the first end <NUM> and the second end <NUM> of the first antenna radiator <NUM>, the second antenna radiator <NUM> is strongly affected by the oscillating electric field, so that the electromagnetic coupling between the first antenna radiator <NUM> and the second antenna radiator <NUM> is stronger.

It can be understood that a first distance between the feeding terminal <NUM> and the first end <NUM> of the first antenna radiator <NUM> may be equal to a second distance between the feeding terminal <NUM> and the second end <NUM> of the first antenna radiator <NUM>. At this time, the feeding terminal <NUM> of the first antenna radiator <NUM> is electrically connected to the signal source <NUM> of the circuit board <NUM> and forms a current loop, which can be concentrated in the middle of the first end <NUM> and the second end <NUM>, and a current density near the middle position is stronger. Therefore, when the second antenna radiator <NUM> covers the first antenna radiator <NUM>, the second antenna radiator <NUM> is more strongly affected by the oscillating electric field, and a coupling strength of electromagnetic waves between the first antenna radiator <NUM> and the second antenna radiator <NUM> is stronger.

For example, a surface of the first antenna radiator <NUM> may include two oppositely arranged long sides and two oppositely arranged short sides, any one of the long sides is connected to the two short sides, and then the two long sides and the two short sides form a rectangular structure. The first end <NUM> may be one of the long sides, the second end <NUM> may be the other one of the long sides, and the feeding terminal <NUM> may be located between the two long sides. The first end <NUM> can also be one of the short sides, the second end <NUM> can also be the other one of the short sides, and the feeding terminal <NUM> can be located between the two short sides.

It is understandable that the feeding terminal <NUM> may be located at a center point of a surface of the first antenna radiator <NUM>. That is, the distance between the feeding terminal801 and the two long sides of the first antenna radiator <NUM> at this time is equal, and the distance between the input end <NUM> and the two short sides of the first antenna radiator <NUM> is also equal. When the feeding terminal <NUM> of the first antenna radiator <NUM> is electrically connected to the signal source <NUM> of the circuit board <NUM> and forms a current loop, the current loop can form an electric field that is centered symmetrically along the center point, and the current is further concentrated near the center point. The first antenna radiator <NUM> can further uniformly radiate wireless signals outward, and the strength of the electromagnetic coupling between the first antenna radiator <NUM> and the second antenna radiator <NUM> covering the first antenna radiator <NUM> is stronger.

Herein, the second antenna radiator <NUM> may be located on an inner surface of the back cover <NUM>. The inner surface is a side surface of the back cover <NUM> facing the first antenna radiator <NUM>. That is, the inner surface refers to a side that is invisible to the back cover <NUM> when viewed from the outside of the electronic device <NUM>. The second antenna radiator <NUM> is spaced apart from the first antenna radiator <NUM> and the circuit board <NUM>.

The second antenna radiator <NUM> and the first antenna radiator <NUM> are electrically connected through electromagnetic coupling. A process of the second antenna radiator <NUM> and the first antenna radiator <NUM> radiating wireless signals to the outside of the electronic device <NUM> includes when the first antenna radiator <NUM> is electrically connected to the radio frequency circuit on the circuit board <NUM>, and the first antenna radiator <NUM> radiates wireless signals of the first wavelength outward. The wireless signals of the first wavelength cause resonance between the first antenna radiator <NUM> and the second antenna radiator <NUM>, and enables the second antenna radiator <NUM> to radiate wireless signals of the wavelength of the second wavelength, and the second wavelength is half of the first wavelength. Therefore, through the radiation cooperation of the first antenna radiator <NUM>, the second antenna radiator <NUM> can generate a <NUM>/2λ resonance.

In addition to the process of receiving the wireless signal transmitted by the base station of the second antenna radiator <NUM> and the first antenna radiator <NUM>, the second antenna radiator <NUM> receives wireless signals of the third wavelength transmitted by the base station, and the wireless signal causes resonances generated between the first antenna radiator <NUM> and the second antenna radiator <NUM>. The first antenna radiator <NUM> receives the wireless signal of the fourth wavelength, and the radio frequency signal circuit electrically connected to the first antenna radiator <NUM> converts the wireless signal of the fourth wavelength into electrical signals that are transmitted in the electronic device <NUM>.

In the electronic device <NUM> provided by the embodiment of the present application, the second antenna radiator <NUM> is arranged on the back cover <NUM>, the first antenna radiator <NUM> is arranged on the support <NUM>, and the first antenna radiator <NUM> and the second antenna radiator <NUM> fully utilize a clearance space between the back cover <NUM> and the support <NUM> to increase an overall height of the antenna formed by the first antenna radiator <NUM> and the second antenna radiator <NUM>, which improves the overall radiation efficiency of the antenna. In the case of the same antenna radiation efficiency, compared to the solution where only one antenna radiator is provided on the support <NUM>, the electronic device <NUM> of the embodiment of the present application is additionally provided with a second antenna radiator <NUM> on the back cover <NUM>. The distance between the first antenna radiator <NUM> and the ground point can be reduced, thereby reducing the installation height requirement of the first antenna radiator <NUM>, and more effectively utilize the internal space of the electronic device <NUM> to lay out the first antenna radiator <NUM> and the second antenna radiator <NUM> without increasing the thickness of the electronic device <NUM>, which facilitates the realization of the portable and thin design of the electronic device <NUM>.

Moreover, in the electronic device <NUM> provided by the embodiment of the present application, through the radiation cooperation of the first antenna radiator <NUM>, the second antenna radiator <NUM> can generate <NUM>/2λ resonance, which broadens an overall broadband formed radiation of the first antenna radiator <NUM> and the second antenna body <NUM>, and further improves the radiation efficiency of the entire electronic device <NUM>. In the case of the same antenna radiation efficiency, compared to the solution where only one antenna radiator is provided on the support <NUM>, the electronic device <NUM> of the embodiment of the present application is additionally provided with a second antenna radiator <NUM> on the back cover <NUM>, a wiring area requirement of the first antenna radiator <NUM> can be reduced by <NUM>/<NUM>, and the installation difficulty of the first antenna radiator <NUM> can be further reduced.

Herein, the second antenna radiator <NUM> may have any shape, for example, a rectangle, a square, a circle, a triangle, and so on. Referring to <FIG>, <FIG> is a structural schematic diagram of the back cover, the second antenna radiator and the support shown in <FIG>, and <FIG> is a schematic diagram of a first structure of the back cover and the second antenna radiator shown in <FIG>, and <FIG> is a schematic structural diagram of the second antenna radiator shown in <FIG>.

Herein, the second antenna radiator <NUM> has a sheet structure. That is, a thickness of the second antenna radiator <NUM> is relatively thin. The sheet-shaped second antenna radiator <NUM> may include a rectangular portion <NUM>. That is, at least a portion of the second antenna radiator <NUM> may have a rectangular structure. When the second antenna radiator <NUM> has a rectangular structure as a whole, the fabrication steps of the second antenna radiator <NUM> can be simplified on one hand, and the radio frequency performance of the second antenna radiator <NUM> is better and stable on the other hand,.

In addition, the rectangular portion <NUM> may include a first side <NUM> and a second side <NUM>. Herein a length of the first side <NUM> may be much greater than a length of the second side <NUM>, so that an edge effect between the second radiator <NUM> and the first antenna radiator <NUM> is small. Specifically, an aspect ratio of the first side <NUM> and the second side <NUM> of the rectangular structure may be L:B=<NUM>:<NUM>. When the aspect ratio of the second antenna radiator <NUM> is <NUM>:<NUM>, the length of the second antenna radiator <NUM> is much larger than its width, and the edge effect between the second antenna radiator <NUM> and the first antenna radiator <NUM> is small, so that the second antenna radiator <NUM> is less affected by the edge effect, and the radio frequency performance of the second antenna radiator <NUM> is more stable.

For example, the length L of the second antenna radiator <NUM> may be <NUM>, the width B of the second antenna radiator <NUM> may be <NUM>, and an area of the second antenna radiator <NUM> is relatively large. On the one hand, a resistance value of the second antenna radiator <NUM> is within a reasonable range, and on the other hand, the edge effect between the second antenna radiator <NUM> and the first antenna radiator <NUM> is small, and the radio frequency performance of the second antenna radiator <NUM> is better.

Referring to <FIG> is a schematic diagram of a second structure of the back cover and the second antenna radiator shown in <FIG>. Herein, the second antenna radiator <NUM> may also include a rectangular portion <NUM> and a protruding portion <NUM>, and the rectangular portion <NUM> and the protruding portion <NUM> are integrally formed. The shape of the protrusion portion <NUM> may also be any shape, such as a triangle, a rectangle, a trapezoid, a fan shape, and the like. Herein, the shape of the protrusion portion <NUM> is also preferably rectangular. On the one hand, the fabrication steps of the protrusion portion <NUM> of the second antenna radiator <NUM> can be simplified, and on the other hand, the radio frequency performance of the second antenna radiator <NUM> is better and more stable.

The protruding portion <NUM> may be located on the short side of the rectangular portion <NUM>, and the second antenna radiator <NUM> may form an antenna radiator with a T-shaped structure or an antenna radiator with an L-shaped structure. The protruding portion <NUM> can also be located on the long side of the rectangular portion <NUM>, and the second antenna radiator <NUM> can form an antenna radiator with a convex structure. When the long side of the rectangular portion <NUM> is parallel to the edge of the middle frame <NUM>, the protruding portion <NUM> is also arranged parallel to the edge of the middle frame <NUM>, so that the protruding portion <NUM> is conveniently located above the first antenna radiator <NUM>.

Herein, the protruding portion <NUM> of the second antenna radiator <NUM> may be located directly below the first antenna radiator <NUM>. That is, an orthographic projection of the protruding portion <NUM> on the support <NUM> may be the same as an orthographic projection of the first antenna radiator <NUM> on the support <NUM>. When the first antenna radiator <NUM> is connected to the radio frequency circuit on the circuit board <NUM>, the wireless signal radiated from the first antenna radiator <NUM> can be transmitted between the first antenna radiator <NUM> and the second antenna radiator <NUM>. The second antenna radiator <NUM> has a closer communication connection with the first antenna radiator <NUM>, and the radio frequency performance of the second antenna radiator <NUM> is better.

The second antenna radiator <NUM> of the embodiment of the present application includes a rectangular portion <NUM> and a protruding portion <NUM>. Compared with an antenna radiator that only includes the rectangular portion <NUM>, the antenna system efficiency thereof is higher. As shown in <FIG> is a comparison diagram of a radiation efficiency of the second antenna radiator in <FIG> and <FIG>.

Herein, the curve S1 is a graph of an overall antenna system efficiency of the second antenna radiator <NUM> including the protruding portion <NUM> and the rectangular portion <NUM> and the first antenna radiator <NUM>, and the curve S2 is a graph of an overall antenna system efficiency of the second antenna radiator <NUM> only including the rectangular portion <NUM> and the first antenna radiator <NUM>, and the curve S3 is an antenna system efficiency of the first antenna radiator <NUM>. When comparing curves <NUM> to <NUM>, at <NUM>, the antenna system efficiency of curve <NUM> is -4dB, the antenna system efficiency of curve <NUM> is -<NUM>. 5dB, and the antenna system efficiency of curve <NUM> is -<NUM>. It can be seen that the efficiency of the antenna system is increased by <NUM> dB after the second antenna radiator is set. After the protrusion portion <NUM> is provided on the second antenna radiator <NUM>, the overall antenna system efficiency of the second antenna radiator <NUM> and the first antenna radiator <NUM> is increased by <NUM> dB.

Referring to <FIG> is a schematic diagram of a first combination of the back cover, the middle frame and the support shown in <FIG>, and <FIG> is a schematic diagram of a second combination of the back cover, the middle frame and the support shown in <FIG>. The middle frame <NUM> may be located on a side of the back cover <NUM> facing the support <NUM>, the middle frame <NUM> is located between the support <NUM> and the back cover <NUM>, and the circuit board <NUM> and the support <NUM> are installed on the middle frame <NUM> together. The middle frame <NUM> may be a ceramic middle frame, a metal middle frame, or a plastic middle frame.

When the middle frame <NUM> is a metal middle frame, the second antenna radiator <NUM> is spaced apart from the edge of the metal middle frame. The edge of the metal middle frame refers to the outermost structure of the metal middle frame. For example, when the metal middle frame is rectangular, the edges can be the upper and lower sides of the metal middle frame, or the left and right sides of the metal middle frame. The space apart refers to the portion where the projection of the second antenna radiator <NUM> on the metal middle frame does not overlap with the edge of the metal middle frame, and there is a gap between the second antenna radiator <NUM> and the edge of the metal middle frame. When the second antenna radiator <NUM> is operating, the signal emitted outward is not easily reflected by the edge of the metal middle frame, the signal received inward is not easily absorbed by the metal middle frame, and the second antenna radiator <NUM> is less affected by the metal middle frame.

The metal middle frame is equivalent to a middle frame antenna radiator, and the second antenna radiator <NUM> will not affect the efficiency of the middle frame antenna radiator made by the edge of the metal middle frame when the distance between the second antenna radiator <NUM> and the edge of the metal middle frame is <NUM>. As shown in <FIG> is a comparison diagram of a radiation efficiency of the first antenna radiator, the second antenna radiator, and the middle-frame antenna radiator shown in <FIG>.

As shown in <FIG>, the curve S4 is a graph of an antenna efficiency curve of the middle frame antenna radiator formed by the edge of the metal middle frame when the distance between the second antenna radiator <NUM> and the edge of the metal middle frame is <NUM>, and the curve S5 is a graph of the antenna efficiency of the middle frame antenna radiator formed by the edge of the metal middle frame without the second antenna radiator <NUM>. Comparing the curve S4 and the curve S5, when the distance between the second antenna radiator <NUM> and the edge of the metal middle frame is <NUM>, the radiation efficiency of the middle frame antenna radiator changes in the range of <NUM>. It can be seen that at this time, the second antenna body <NUM> basically has no effect on the efficiency of the metal third antenna radiator.

Referring to <FIG> is a S12 parameter diagram of the first antenna radiator, the second antenna radiator, and the middle frame antenna radiator shown in <FIG>. When the distance between the second antenna radiator <NUM> and the edge of the metal middle frame is <NUM>, at this time, the middle frame antenna radiator formed by the edge of the metal middle frame will not affect the overall efficiency of the antenna formed by the second antenna radiator <NUM> and the first antenna radiator <NUM>.

The S-parameter can be used to evaluate the performance of antenna reflected signals and transmitted signals. The S-parameter is usually expressed as: S output and S input. As shown in <FIG>, S12 refers to a ratio of the output signal of a port on the first antenna radiator <NUM> and the second antenna radiator <NUM> to the input signal between the port on the middle frame antenna radiator. Herein, in the S12 parameter diagram in <FIG>, the edge of the metal middle frame is designed as a middle frame antenna radiator, that is, the edge of the metal middle frame is equivalent to the middle frame antenna radiator in <FIG>.

In the S12 parameter diagram shown in <FIG>, the curve S6 is the overall radiation curve of the first antenna radiator <NUM> and the second antenna radiator <NUM>, the curve S7 is the radiation curve of the middle frame antenna radiator, and the curve S8 represents the radiation curve between the output signal of the port of the first antenna radiator <NUM> and the second antenna radiator <NUM> and the port on the middle frame antenna radiator. The curve <NUM> can reflect the isolation between the whole antenna of the second antenna radiator <NUM> and the first antenna radiator <NUM> and the middle frame antenna radiator. That is, the curve <NUM> can reflect the interference of the edge of the metal middle frame to the whole antenna of the second antenna radiator <NUM> and the first antenna radiator <NUM>. The higher the peak of the curve <NUM>, the smaller isolation is between the second antenna radiator <NUM> and the first antenna radiator <NUM> and the metal third antenna radiator. That is, the greater the interference is between the whole antenna of the second antenna radiator <NUM> and the first antenna radiator <NUM> and the metal middle frame. The smaller the peak value of the curve <NUM>, the greater the isolation is between the second antenna radiator <NUM> and the first antenna radiator <NUM> and the metal third antenna radiator. That is, the interference is between the second antenna radiator <NUM>, the first antenna radiator <NUM> and metal middle frame is smaller.

It can be seen from <FIG> that when the distance D1 between the second antenna radiator <NUM> and the edge of the metal middle frame is <NUM>, the isolation between the whole antenna of the first antenna radiator <NUM> and the second antenna radiator <NUM> and the middle frame antenna radiator is less than -10db in the target frequency band <NUM>-<NUM>. The metal middle frame has a small interference effect on the whole antenna, and the overall radiation directivity, gain and impedance of the antenna are in a better state.

A Table <NUM> below is the radiation efficiency parameter table of the first antenna radiator, the second antenna radiator and the middle frame antenna radiator. It can also be seen from Table <NUM> that the average value of the overall system efficiency of the antenna composed of the first antenna radiator <NUM> and the second antenna radiator <NUM> in the embodiment of the present application is compared with that of the middle-frame antenna radiator composed of a metal middle frame. The average value of the system efficiency is increased by <NUM> dB. In the embodiment of the present application, the first antenna radiator <NUM> and the second antenna radiator <NUM> greatly improve the radiation efficiency of the entire electronic device <NUM>.

Referring to <FIG> is a schematic diagram of the third combination of the back cover, the middle frame and the support shown in <FIG>, and <FIG> is a schematic diagram of the fourth combination of the back cover, the middle frame and the support shown in <FIG>. The number of the first antenna radiator <NUM> may be multiple, and the number of the second antenna radiator <NUM> is equal to the number of the first antenna radiator <NUM>. A first antenna radiator <NUM> and a second antenna radiator <NUM> form an antenna body. In a whole antenna, the first antenna radiator <NUM> and the second antenna radiator <NUM> are electrically connected through electromagnetic coupling. The first antenna body <NUM> radiates the wireless signal of the first wavelength, the second antenna radiator <NUM> radiates the wireless signal of the second wavelength. The second wavelength is half of the first wavelength. In an antenna as a whole, through cooperation of the first antenna radiator <NUM>, the second antenna radiator <NUM> can generate <NUM>/2λ resonance.

For example, the number of the first antenna radiator <NUM> and the second antenna radiator <NUM> are both four, the four first antenna radiators <NUM> are respectively located at the four corners of the support <NUM>, and the four second antenna radiators <NUM> are located at the four corners of the back cover <NUM>. When the first antenna radiator <NUM> in each corner radiates a wireless signal of the first wavelength to the outside of the electronic device <NUM>, the second antenna radiator <NUM> located in the same corner correspondingly resonates and radiates the wireless signal of the second wavelength to the outside of the electronic device <NUM> at a wavelength of half of the first wavelength, so that with the cooperation of the first antenna radiator <NUM>, the second antenna radiator <NUM> can generate a <NUM>/2λ resonance. Moreover, arranging four first antenna radiators <NUM> and second antenna radiators <NUM> at the four corners of the support <NUM> and the back cover <NUM> can increase the distance between the multiple antenna radiators and reduce mutual interference between the multiple antenna radiators.

It can be understood that, in the entire antenna composed of a first antenna radiator <NUM> and a second antenna radiator <NUM>, the first antenna radiator <NUM> and the second antenna radiator <NUM> respectively radiate wireless signals of different frequencies. For example, the frequency of the wireless signal radiated by the second antenna radiator <NUM> may be higher than the frequency of the wireless signal radiated by the first antenna radiator <NUM>.

Each antenna as a whole can radiate one or more of wireless signals in the middle, high, and low frequency bands of the cellular frequency band, wireless signals in the Wi-Fi frequency band, and wireless signals in the GPS frequency band. The multiple antennas as a whole can radiate wireless signals of different frequency bands to broaden the bandwidth of the entire electronic device <NUM>. Multiple antennas can also have at least two groups of antennas radiating wireless signals of the same frequency band as a whole to form a multiple-input multiple-output (MIMO) antenna combination with a combination of high and high frequencies in the cellular frequency band, and a MIMO combination of high and low frequencies in the cellular frequency band, and antenna combination and MIMO antenna combination of Wi-Fi frequency band.

The electronic device <NUM> of the embodiment of the present application may further include a third antenna radiator and a fourth antenna radiator. The third antenna radiator may be arranged on the metal middle frame, and the fourth antenna radiator may be arranged on the circuit board <NUM>. The number of the third antenna radiator may be multiple, and the number of the fourth antenna radiator may also be multiple. Furthermore, the third antenna radiator, the fourth antenna radiator, the first antenna radiator <NUM>, and the second antenna radiator <NUM> of the embodiment of the present application are all on different horizontal planes, which can reduce the interference between the third antenna radiator, the fourth antenna radiator, the first antenna radiator <NUM> and the second antenna radiator <NUM>.

In addition, the third antenna radiator and the fourth antenna radiator can also radiate one or more of a wireless signal in the middle, high, and low frequency bands of the cellular frequency band, a wireless signal in the Wi-Fi frequency band, and a wireless signal in the GPS frequency band. The wireless signals radiated by the overall antenna formed by the third antenna radiator, the fourth antenna radiator, and the first antenna radiator <NUM> and the second antenna radiator <NUM> may all be different to broaden the bandwidth of the entire electronic device <NUM>. The wireless signals radiated the third antenna radiator, the fourth antenna radiator, and the overall antenna can have at least two groups of radiated wireless signals with the same frequency band to form a MIMO antenna combination with a high frequency combination in the cellular frequency band, a MIMO antenna combination with high and low frequencies in the cellular frequency band, and a MIMO combination of Wi-Fi frequency band.

It should be noted that the electronic device <NUM> may also include multiple entire antennas, multiple third antenna radiators, and multiple fourth antenna radiators at the same time, and the number of the entire antenna, the third antenna radiator, and the fourth radiator may vary according to the requirements of electronic device <NUM> to meet the actual communication requirements of the electronic device <NUM>.

In the electronic device <NUM> of the embodiment of the present application, the first antenna radiator <NUM> may be formed by a 3D-MID process technology using a three-dimensional laser. For example, the first antenna radiator <NUM> may adopt a laser direct molding technology. First, the laser induces a modified material, and then a metal is selectively and directly plated and formed on the support <NUM>. The first antenna radiator <NUM> does not need to occupy the internal space of the electronic device <NUM>. Therefore, the thickness of the electronic device <NUM> will not be increased, and the thinner and lighter design of the electronic device <NUM> can be achieved.

It is understandable that the first antenna radiator <NUM> can also be located on the support <NUM> using other processes. For example, the first antenna radiator <NUM> can be a laser induced common material using a laser activated technology, and then a metal is selectively plated to form the first antenna radiation body <NUM>. For example, the first antenna radiator <NUM> may adopt a patch antenna technology to achieve the connection between the first antenna radiator <NUM> and the support <NUM>.

In the electronic device <NUM> of the embodiment of the present application, the second antenna radiator <NUM> may be formed by using laser direct molding technology, in which a laser-induced modified material is formed, and then a metal is plated. The second antenna radiator <NUM> can also be formed by a laser-activated metal plating technology, and a laser-induced common material is formed, and then a selective metal plating is performed.

The second antenna radiator <NUM> may also be formed using laser reconstruction printing technology. Referring to <FIG> is a schematic flowchart of a first method for fabricating an antenna radiator according to an embodiment of the application.

The fabrication method for the antenna radiator provided by the embodiment of the present application is configured to fabricate the second antenna radiator <NUM>, and the fabrication method for the antenna radiator includes:.

Step <NUM>: using the back cover of the electronic device as a substrate, and selecting a target area on the substrate.

Herein, the projection of the target area on the support <NUM> can overlap with the projection of the first antenna radiator <NUM> on the support <NUM>, so that the second antenna radiator <NUM> formed in the subsequent steps can be located right below the first antenna radiator <NUM>, so the electromagnetic coupling between the first antenna radiator <NUM> and the second antenna radiator <NUM> can be stronger.

The shape of the target area may be a rectangle, and the shape of the target area may also be a special shape with a convex structure. The size of the target area may be slightly larger than the size of the second antenna radiator <NUM>, and the redundant portion may be removed by laser correction in the subsequent steps.

Step <NUM>: spraying a silver paste material in the target area and form a silver paste coating;.

Specifically, please refer to <FIG> is a schematic diagram of a second flow of the method for fabricating an antenna radiator according to an embodiment of the application, and this step may include:.

Step <NUM>: mixing the silver paste material and a curing agent to form a mixture, and spray the mixture evenly in the target area; and.

Step <NUM>: curing the sprayed mixture at a temperature of <NUM>-<NUM> for <NUM>-<NUM> minutes, a curing reaction occurs between the silver paste material and the curing agent, and the silver paste material is firmly attached to the back cover <NUM> to form a circuit-shaped silver Paste coating.

Herein, the curing agent may include aliphatic amine curing agent, polyamide curing agent, acid anhydride curing agent, and the like. The curing agent is added to the silver paste material, and the cured silver paste coating has excellent properties such as conductivity, hardness, adhesion, and bending resistance, so that the radio frequency performance of the second antenna radiator <NUM> is better.

The silver paste material may include conductive phase silver powder, matrix resin binder phase, solvent and other auxiliary agents. The matrix resin binder phase is the carrier of the conductive phase silver powder, which can provide the silver paste material with the basic fluidity and adhesion of the paste, and provide the basic mechanical properties of the paste to make the paste have a certain degree of filmforming, durability, resistance, and bending performance. The solvent can dissolve the binder phase of the matrix resin, so that the silver powder is uniformly dispersed in the polymer, and the viscosity of the conductive silver paste can be adjusted to improve the drying speed.

Specifically, the matrix resin binder phase may include epoxy resin binder phase, acrylic resin, alkyd resin, melamine formaldehyde resin, polyurethane resin, and the like. Solvents may include alcohols, lipids, ketones, diethanol butyl ether acetate, diethanol ethyl ether acetate, tetrahydrofuran, and the like.

The following uses epoxy resin as the matrix resin binder phase, tetrahydrofuran as the solvent, and polyethylene glycol as the active agent as an example to illustrate the fabrication method for the silver paste material of the present application:.

In the above method, the portions by weight of the raw materials of each component may be: <NUM>-<NUM> portions of the silver powder, <NUM>-<NUM> portions of the epoxy resin, <NUM>-<NUM> portions of the tetrahydrofuran, and the polyethylene glycol for <NUM>-<NUM> portion. When a silver paste material is prepared according to the above-mentioned raw materials, the conductive performance of the silver paste material is good, the resistance value is in a suitable range, and the silver powder can be uniformly dispersed in the epoxy resin. A stable bond is formed between the silver paste material and the silver paste material has a suitable viscosity and drying speed. When the silver paste material is sprayed on the back cover <NUM> under the action of the curing agent to form the second antenna radiator <NUM>, the silver paste material can form a three-dimensional network of thermo-curing plastics, and the shrinkage rate during the curing reaction is small. The second antenna radiation <NUM> has better electrical conductivity and mechanical properties. Of course, the second antenna radiator <NUM> of the present application can also be made of other raw materials, and is not limited to the above raw materials and their weight fractions.

In the examples of this application, a viscosity of the silver paste material at <NUM> is <NUM>-<NUM> pascals. A fluidity of the silver paste material is better, and the viscosity of the silver paste material will not be too large, nor will it cause the silver paste material and the curing time is too long. A thixotropic coefficient of the silver paste material is <NUM>-<NUM>, and the silver paste material is easy to solidify in the spraying process and form a uniform layer, so that the surface of the second antenna radiator <NUM> is flatter. The silver paste material adopts a <NUM>-grid test, and the test result can be 5B. The adhesion performance of the silver paste material is good. The surface of the second antenna radiator <NUM> after curing is smoother, and the bonding force between the second antenna radiator <NUM> and the back cover <NUM> is stronger. The second antenna radiator <NUM> of the embodiment of the present application has excellent mechanical properties.

A silver paste antenna fabricated by the silver paste material has a Hegman fineness of less than <NUM> microns, and a volume resistance measured by the four-point electrode method is <NUM>×<NUM>-<NUM> ohm·cm. In the silver paste antenna within this range, the bond between the silver powder and the matrix resin binder phase is relatively dense, the conductive performance of the silver paste antenna is good, and the resistance value of the silver paste antenna is also low, thereby making the second antenna body <NUM> of the present application has excellent electrical properties.

Step <NUM>: performing a laser on the silver paste coating to form a second antenna radiator of the electronic device.

Through a three-dimensional laser, the redundant portion of the silver paste coating outside the circuit shape is removed by a laser, and finally a silver paste antenna with a high-precision circuit interconnection structure is formed.

In the method for fabricating the antenna radiator provided by the embodiment of the present application, the second antenna radiator <NUM> of the electronic device <NUM> can be formed by spraying the silver paste material directly in the target area of the back cover <NUM>. Compared with the laser direct forming technology, the second antenna radiator <NUM> formed by the above method does not need to go through the step of laser-induced modification of the material. The fabrication method of the second antenna radiator <NUM> is simpler, and the restriction on the material of the back cover <NUM> is lower. In addition, the silver paste material has lower volatile energy and better environmental performance.

In the description of this application, it should be understood that terms such as "first" and "second" are only used to distinguish similar objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the indicated technology The number of features.

Claim 1:
An electronic device (<NUM>), comprising:
a circuit board (<NUM>), comprising a signal source;
a support (<NUM>) located on a side of the circuit board (<NUM>) and supporting the circuit board (<NUM>);
a first antenna radiator (<NUM>) located on the support, electrically connected to the signal source, and configured to radiate a wireless signal of a first wavelength;
a back cover (<NUM>) located on a side of the support (<NUM>) away from the circuit board (<NUM>); and
a second antenna radiator (<NUM>) located on a side of the back cover (<NUM>) facing the first antenna radiator (<NUM>), wherein the second antenna radiator (<NUM>) and the first antenna radiator (<NUM>) are electrically connected through electromagnetic coupling;
wherein the second antenna radiator (<NUM>) comprises a rectangular portion (<NUM>) and a protruding portion (<NUM>) located on a first side (<NUM>) of the rectangular portion (<NUM>), an orthographic projection of the protruding portion (<NUM>) on the support (<NUM>) covers an entire orthographic projection of the first antenna radiator(<NUM>) on the support (<NUM>), and when the first antenna radiator (<NUM>) radiates a wireless signal of the first wavelength, the second antenna radiator (<NUM>) is configured to generate and radiate a wireless signal of the second wavelength through resonance, and the second wavelength is half of the first wavelength.