Antenna module and electronic equipment

Abstract

The utility model provides an antenna module and electronic equipment. The antenna module comprises a feed point, an FPC board and a filter circuit, wherein the FPC board is electrically connected with the feed point and the filter circuit respectively; and the working frequency band of the filter circuit covers the frequency of clutter introduced by the FPC board. According to the embodiment, clutters in the working frequency band of the antenna module can be eliminated by additionally arranging the filter circuit, and the effect of improving the antenna performance is achieved.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular, to an antenna module and an electronic device. Background Art

[0002] Multiple antennas are provided in an electronic device. A flexible printed circuit (FPC) board may be provided between the feeding points of some antennas and the main board. The FPC board has a planar structure, which has the advantages of small occupied space and being conducive to compatibility with other modules.

[0003] A transmission line is provided on the FPC board to transmit signals between the feeding point and the signal source. However, due to the planar structure of the FPC, the transmission line on it is easily interfered, introducing clutter into the band and affecting the efficiency of the antenna. Summary of the Invention

[0004] The present disclosure provides an antenna module and an electronic device to solve the above technical problems.

[0005] According to a first aspect of the present disclosure, an antenna module is provided. The antenna module includes a feeding point, an FPC board, and a filtering circuit. The FPC board is electrically connected to the feeding point and the filtering circuit respectively; the operating frequency band of the filtering circuit covers the frequency at which the FPC board introduces clutter.

[0006] Optionally, the antenna module further includes a conversion device; the conversion device is used to be electrically connected to the transmission line of the FPC board; the ground pin of the conversion device is electrically connected to the filtering circuit.

[0007] Optionally, the conversion device further includes a matching pin. The first end of the matching pin is connected to the ground pin, and the second end of the matching pin is connected to the insertion interface of the filtering circuit.

[0008] Optionally, the FPC board includes a metal layer, a first dielectric layer, and a ground layer; the metal layer is provided on the first side of the first dielectric layer, and the ground layer is provided on the second side of the first dielectric layer; a circuit pattern is provided in the metal layer, and the circuit pattern is electrically connected to the feeding point. The ground layer is electrically connected to the common ground through a conductive cloth.

[0009] Optionally, the FPC board further includes a second dielectric layer and a protective layer; the ground layer is provided on the first side of the second dielectric layer, and the protective layer is provided on the second side of the second dielectric layer; the protective layer is electrically connected to the ground layer through a plurality of vias.

[0010] Optionally, the ground layer includes a first ground wire and a second ground wire. The first end of the filtering circuit is electrically connected to the first ground wire, and the second end of the filtering circuit is electrically connected to the second ground wire.

[0011] Optionally, the filtering circuit includes at least one of the following: a capacitor unit, an inductor unit, an LC parallel unit, and an LC series unit.

[0012] Optionally, the antenna module further includes a switching switch, which is connected in series between the FPC board and the filtering circuit; the switching switch is used to switch to any unit with different impedance values in the filtering circuit.

[0013] According to a second aspect of the present disclosure, there is provided an electronic device, which includes a frame, a main board, and an antenna module; the antenna module is electrically connected to the main board and the frame respectively, and a part of the frame serves as a radiation stub of the antenna module.

[0014] Optionally, the electronic device further includes a speaker module; the speaker module is disposed on the main board; the filtering circuit in the antenna module is further used to isolate the antenna module and the speaker module.

[0015] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0016] The antenna module provided in this embodiment includes a feeding point, an FPC board, and a filtering circuit. The FPC board is electrically connected to the feeding point and the filtering circuit respectively; the operating frequency band of the filtering circuit covers the frequency at which the FPC board introduces clutter. In this way, in this embodiment, by adding a filtering circuit, the clutter within the operating frequency band of the antenna module can be eliminated, achieving the effect of improving the antenna performance.

[0017] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a block diagram of an electronic device according to an embodiment of the present disclosure.

[0019] Figure 2 It is a block diagram of another electronic device according to an embodiment of the present disclosure.

[0020] Figure 3 It is a schematic diagram of an antenna module according to an embodiment of the present disclosure.

[0021] Figure 4 It is a schematic structural diagram of an FPC board according to an embodiment of the present disclosure.

[0022] Figure 5 It is a schematic structural diagram of another FPC board according to an embodiment of the present disclosure.

[0023] Figure 6Schematic diagram of the structure of another FPC board according to an embodiment of the present disclosure.

[0024] Figure 7 Schematic diagram of the structure of another FPC board according to an embodiment of the present disclosure.

[0025] Figure 8 Block diagram of an electronic device according to an embodiment of the present disclosure. Detailed implementation manners

[0026] Here, exemplary embodiments will be described in detail, and examples thereof are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices consistent with some aspects of the present disclosure as detailed in the appended claims.

[0027] Considering that the transmission line on the FPC board will introduce clutter, after analysis, the above clutter mainly comes from the Loop mode formed by the ground current itself. When the grounding position is different, the electrical length of the Loop mode is different, resulting in different frequency bands of the clutter. When the clutter frequency band falls within the frequency band of the antenna, it will affect the working performance of the antenna.

[0028] For this reason, the embodiments of the present disclosure provide an antenna module and an electronic device. The inventive concept of the antenna module is to add a filtering circuit to the FPC board, and the working frequency band of the filtering circuit covers the frequency of the clutter introduced by the FPC board; through the filtering circuit, the electrical length of the Loop mode of the antenna module can be adjusted, and the frequency of the clutter can be moved out of the working frequency band of the antenna module, improving the working performance of the antenna.

[0029] In one embodiment, referring to Figure 1 , the electronic device includes an antenna module 10, a main board 20, and a frame 30; the antenna module 10 is electrically connected to the main board 20 and the frame 30 respectively. The frame 30 includes a slit d, and a part 22 of the frame is used as a radiation stub of the antenna module 10.

[0030] In one embodiment, continuing to refer to Figure 1 , the antenna module 10 includes a feed point FB1, an FPC board 11, and a filtering circuit 12. The FPC board 11 is electrically connected to the feed point FB1 and the filtering circuit 12 respectively; the working frequency band of the filtering circuit 12 covers the frequency of the clutter introduced by the FPC board 11. In this embodiment, the filtering circuit 12 is electrically connected to the ground wire on the FPC board 11. In this way, in this embodiment, by setting the filtering circuit 12, the electrical length of the ground current on the FPC board 11 can be adjusted, so as to achieve the purpose of moving the clutter outside the working frequency band of the antenna module, and the working efficiency of the antenna module within the working frequency band can be ensured.

[0031] In one embodiment, referring to Figure 2 , the antenna module 10 further includes a conversion device 21. The conversion device 21 is used for electrically connecting to the transmission line of the FPC board 11. In one example, the conversion device 21 includes a male conversion head and a female conversion head. Among them, the male conversion head is electrically connected to the transmission line on the FPC board 11, and the female conversion head is electrically connected to the transmission line on the main board of the electronic device. In this way, when the male conversion head is inserted into the female conversion head, the transmission line on the FPC board 11 and the transmission line on the main board 20 can be electrically connected.

[0032] In this embodiment, the conversion device 21 includes a ground pin, and the ground pin is electrically connected to the ground wire on the FPC board 11; moreover, the ground pin of the conversion device 21 is electrically connected to the filter circuit 12. In one example, the ground pin is electrically connected to the first end of the filter circuit 12, and the second end of the filter circuit 12 is connected to (common) ground. In this way, the filter circuit 12 can form a current path between the ground wire of the FPC board and the common ground, so as to adjust the electrical length of the Loop mode of the antenna module.

[0033] Considering that the ground pin is a metal pin, in this embodiment, the metal pin can be extended on the basis of the ground pin and used as a matching pin; one end of the filter circuit can be provided with a female head, and the female head of the filter circuit can be inserted into the above-mentioned matching pin, and the other end is connected to the common ground, which is simple to install and reduces the operation difficulty during assembly.

[0034] In one embodiment, the filter circuit 12 may include at least one of the following: a capacitor unit, an inductor unit, an LC parallel unit, and an LC series unit. Those skilled in the art can select at least one unit of the filter circuit 12 according to the specific scenario, and the corresponding solutions fall within the protection scope of the present disclosure.

[0035] The capacitor unit refers to a circuit formed by at least one capacitor in series, parallel, or a series-parallel combination. Figure 3 The capacitor unit 31 formed by using one capacitor is exemplified.

[0036] The inductor unit refers to a circuit formed by at least one inductor in series, parallel, or a series-parallel combination. Figure 3 The inductor unit 32 formed by using one inductor is exemplified.

[0037] The LC series unit refers to a circuit obtained by connecting an inductor and a capacitor in series. Figure 3 The LC series unit 33 formed by connecting one inductor and one capacitor in series is exemplified.

[0038] The LC parallel unit refers to a circuit obtained by connecting an inductor and a capacitor in parallel. Figure 3 The LC parallel unit 34 formed by connecting one inductor and one capacitor in parallel is exemplified.

[0039] In this embodiment, continue to refer to Figure 3 , the antenna module 10 further includes a switching switch 35. The switching switch 35 is connected in series between the FPC board 11 and the filter circuit 12; the switching switch 35 is used to switch to any one of the units (31, 32, 33 or 34) with different impedance values in the filter circuit 12. In this way, when the processor of the electronic device switches the operating frequency band of the antenna module, it can control the switching switch 35 to sequentially switch to each unit, and then detect the radiation efficiency of the antenna module 10, and finally select and maintain the unit with the highest radiation efficiency, so as to ensure the radiation efficiency of the antenna module 10.

[0040] In one embodiment, refer to Figure 4 , the FPC board includes a metal layer 41, a first dielectric layer 42 and a ground layer 43. The first side of the first dielectric layer 42 ( Figure 4 the upper layer shown in the example) is provided with a metal layer 41, and the second side of the first dielectric layer 42 ( Figure 4 the lower layer shown in the example) is provided with a ground layer 43; a circuit pattern is provided in the metal layer 41, and the circuit pattern is electrically connected to the feed point FB1 and the signal source on the main board 20. The ground layer is electrically connected to the common ground and the ground connection point of the frame 30 through a conductive cloth. In this embodiment, the method of increasing the large-area copper exposure to the ground can be adopted to avoid forming a loop mode and achieve the effect of eliminating clutter.

[0041] In another embodiment, refer to Figure 5 , the FPC board further includes a second dielectric layer 51 and a protective layer 52; the first side of the second dielectric layer 51 ( Figure 5 the upper layer shown in the example) is provided with a ground layer 43, and the second side of the second dielectric layer 51 ( Figure 5 the lower layer shown in the example) is provided with a protective layer 52; the protective layer 52 is electrically connected to the ground layer 43 through a plurality of vias 53. In this embodiment, by increasing the number of layers of the FPC board 11 and connecting the ground layer 43 and the protective layer 52 through the vias 53, the purpose of large-area copper exposure to the ground can be achieved, and then it is electrically connected to the common ground and the ground connection point of the frame 30 through a conductive cloth. In this embodiment, the method of increasing the large-area copper exposure to the ground can be adopted to avoid forming a loop mode and achieve the effect of eliminating clutter.

[0042] In one embodiment, the filter circuit 12 can be arranged above the ground layer of the FPC board 11. Refer to Figure 6, the formation 43 includes a first separation layer 61 which divides the formation 43 into two parts, namely a first ground wire and a second ground wire. Among them, the first ground wire is provided with a first ground wire connection end 62, and the second ground wire is provided with a second ground wire connection end 63. The first end of the filter circuit 12 can be electrically connected to the first ground wire connection end 62, and the second end of the filter circuit 12 can be electrically connected to the second ground wire connection end 63. In this way, a current path is formed between the first ground wire and the second ground wire of the filter circuit 12 to adjust the electrical length of the Loop mode of the antenna module.

[0043] In another embodiment, the filter circuit 12 can be disposed on the protective layer of the FPC board 11. Refer to Figure 7 , the protective layer 52 includes a second separation layer 71 which divides the protective layer 52 into two parts, namely a first protective layer and a second protective layer. Among them, the first protective layer is provided with a first protective layer connection end 72, and the second protective layer is provided with a second protective layer connection end 73. The first end of the filter circuit 12 can be electrically connected to the first protective layer connection end 72, and the second end of the filter circuit 12 can be electrically connected to the second protective layer connection end 73. In this way, a current path is formed between the first protective layer and the second protective layer of the filter circuit 12 to adjust the electrical length of the Loop mode of the antenna module.

[0044] Figure 8 is a block diagram of an electronic device shown according to an exemplary embodiment. For example, the electronic device 800 can be a smart phone, a computer, a digital broadcast terminal, a tablet device, a medical device, a fitness device, a personal digital assistant, etc. The electronic device can be used as the above-mentioned first device or the peer device.

[0045] Referring to Figure 8 , the electronic device 800 may include one or more of the following components: a processing component 802, a memory 804, a power supply component 806, a multimedia component 808, an audio component 810, an input / output (I / O) interface 812, a sensor component 814, a communication component 816, and an image acquisition component 818.

[0046] The processing component 802 generally controls the overall operation of the electronic device 800, such as operations associated with display, telephone call, data communication, camera operation, and recording operation. The processing component 802 may include one or more processors 820 to execute computer programs. In addition, the processing component 802 may include one or more modules to facilitate the interaction between the processing component 802 and other components. For example, the processing component 802 may include a multimedia module to facilitate the interaction between the multimedia component 808 and the processing component 802. In one example, the processing component may include a processor for executing the above-mentioned antenna control method.

[0047] The memory 804 is configured to store various types of data to support the operation of the electronic device 800. Examples of such data include computer programs for any application or method operating on the electronic device 800, contact data, phone book data, messages, pictures, videos, and the like. The memory 804 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disks, or optical disks.

[0048] The power supply component 806 provides power to various components of the electronic device 800. The power supply component 806 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the electronic device 800. The power supply component 806 may include a power chip, and the controller can communicate with the power chip to control the power chip to turn on or off the first switching device, so that the battery supplies power to the circuit board circuit or not.

[0049] The multimedia component 808 includes a screen that provides an output interface between the electronic device 800 and the target object. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input information from the target object. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can not only sense the boundaries of touch or swipe actions, but also detect the duration and pressure associated with the touch or swipe operation.

[0050] The audio component 810 is configured to output and / or input audio file information. For example, the audio component 810 includes a microphone (MIC), which is configured to receive external audio file information when the electronic device 800 is in an operating mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio file information can be further stored in the memory 804 or transmitted via the communication component 816. In some embodiments, the audio component 810 further includes a speaker for outputting audio file information.

[0051] The I / O interface 812 provides an interface between the processing component 802 and the peripheral interface module, and the peripheral interface module may be a keyboard, a click wheel, buttons, etc.

[0052] The sensor assembly 814 includes one or more sensors for providing a status assessment of various aspects of the electronic device 800. For example, the sensor assembly 814 can detect the on / off state of the electronic device 800, the relative positioning of components, such as the display screen and keypad of the electronic device 800. The sensor assembly 814 can also detect a change in the position of the electronic device 800 or a component, the presence or absence of contact between a target object and the electronic device 800, the orientation or acceleration / deceleration of the electronic device 800, and the temperature change of the electronic device 800. In this example, the sensor assembly 814 can include a magnetic sensor, a gyroscope, and a magnetic field sensor, and can also include an inertial sensor, an image sensor, etc. The magnetic field sensor includes at least one of the following: a Hall sensor, a thin-film magnetoresistive sensor, a magnetic fluid acceleration sensor.

[0053] The communication component 816 is configured to facilitate communication between the electronic device 800 and other devices in a wired or wireless manner. The electronic device 800 can access a wireless network based on communication standards, such as WiFi, 2G, 3G, 4G, 5G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives broadcast information or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology, and other technologies. In one example, the communication component 816 includes Figures 2 to 7 the antenna module shown.

[0054] In an exemplary embodiment, the electronic device 800 can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components.

[0055] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the disclosure herein. The present disclosure is intended to cover any variations, uses, or adaptations that follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not disclosed herein. The specification and embodiments are only to be considered exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0056] It should be understood that the present disclosure is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present disclosure is only limited by the appended claims.

Claims

1. An antenna module, characterized in that: The antenna module includes a feed point, an FPC board and a filter circuit, wherein the FPC board is electrically connected to the feed point and the filter circuit respectively; and the working frequency band of the filter circuit covers the frequency of the clutter introduced by the FPC board.

2. The antenna module according to claim 1, characterized in that: The antenna module also includes a conversion device; the conversion device is used to be electrically connected to the transmission line of the FPC board; and the ground pin of the conversion device is electrically connected to the filter circuit.

3. The antenna module according to claim 2, characterized in that: The conversion device further comprises a matching pin, a first end of the matching pin is connected to the ground pin, and a second end of the matching pin is connected to the plug-in interface of the filter circuit.

4. The antenna module according to claim 1, characterized in that: The FPC board includes a metal layer, a first dielectric layer and a ground layer; the metal layer is arranged on the first side of the first dielectric layer, and the ground layer is arranged on the second side of the first dielectric layer; a circuit pattern is arranged in the metal layer, the circuit pattern is electrically connected to the feeding point, and the ground layer is electrically connected to a common ground through a conductive cloth.

5. The antenna module according to claim 4, characterized in that: The FPC board also includes a second dielectric layer and a protective layer; the ground layer is disposed on a first side of the second dielectric layer, and the protective layer is disposed on a second side of the second dielectric layer; the protective layer and the ground layer are electrically connected through a plurality of vias.

6. The antenna module according to claim 4, characterized in that: The ground layer includes a first ground line and a second ground line, a first end of the filter circuit is electrically connected to the first ground line, and a second end of the filter circuit is electrically connected to the second ground line.

7. The antenna module according to any one of claims 1 to 6, characterized in that: The filter circuit includes at least one of the following: a capacitor unit, an inductor unit, an LC parallel unit, and an LC series unit.

8. The antenna module according to claim 7, characterized in that: The antenna module also includes a switching switch, which is connected in series between the FPC board and the filter circuit; the switching switch is used to switch to any unit with different impedance values ​​in the filter circuit.

9. An electronic device, characterized in that: The electronic device comprises a frame, a main board and an antenna module; the antenna module is electrically connected to the main board and the frame respectively, and a part of the frame serves as a radiation branch of the antenna module.

10. The electronic device according to claim 9, characterized in that: The electronic device also includes a speaker module; the speaker module is arranged on the main board; the filter circuit in the antenna module is also used to isolate the antenna module and the speaker module.

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