Side key circuit board and terminal equipment

Abstract

The invention relates to a side key circuit board and a terminal device, and relates to the technical field of communication, an antenna radiator is arranged near the side key circuit board, a mainboard end of the side key circuit board is used for being connected with a mainboard of the terminal device, and the side key circuit board comprises a first filtering unit, a second filtering unit and a second filtering unit, the first filtering unit is used for adjusting the frequency of high-frequency harmonic waves generated by the wiring to a first frequency; the second filtering unit is arranged in a second area of the wire, and the second filtering unit is used for adjusting the frequency of the low-frequency harmonic wave generated by the wire to a second frequency; wherein the distance between the first area and the mainboard end is smaller than the distance between the second area and the mainboard end, the first frequency is larger than or equal to the maximum frequency value in the target frequency band, and the second frequency is smaller than or equal to the minimum frequency value in the target frequency band. According to the invention, the influence on the frequency of the antenna radiator near the side key circuit board can be reduced, and the radiation performance of the antenna radiator near the side key circuit board is effectively improved.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular, to a side key circuit board and a terminal device. Background Art

[0002] In related technologies, metal parts inside a mobile terminal can form harmonics within the antenna radiation frequency band, which affects the antenna performance. Reasonably modulating the frequency of the harmonics can effectively improve the radiation performance of the antenna. Summary of the Invention

[0003] To overcome the problems existing in related technologies, the present disclosure provides a side key circuit board and a terminal device.

[0004] According to a first aspect of an embodiment of the present disclosure, there is provided a side key circuit board. An antenna radiator is near the side key circuit board. The main board end of the side key circuit board is used to connect to the main board of the terminal device. The side key circuit board includes:

[0005] A first filtering unit, which is arranged in a first area of the trace of the side key circuit board. The first filtering unit is used to adjust the frequency of the high-frequency harmonics generated by the trace to a first frequency;

[0006] A second filtering unit, which is arranged in a second area of the trace. The second filtering unit is used to adjust the frequency of the low-frequency harmonics generated by the trace to a second frequency;

[0007] Wherein, the distance between the first area and the main board end is less than the distance between the second area and the main board end. The first frequency is greater than or equal to the maximum frequency value in the target frequency band, and the second frequency is less than or equal to the minimum frequency value in the target frequency band.

[0008] Optionally, the decoupling elements in the first filtering unit and the second filtering unit are both inductors.

[0009] Optionally, a first inductance value of the inductor in the first filtering unit is less than a second inductance value of the inductor in the second filtering unit.

[0010] Optionally, the decoupling elements in the first filtering unit and the second filtering unit are both resistors.

[0011] Optionally, the side key circuit board further includes a first button conductor, a second button conductor, and a third button conductor. The feeding end of the first button conductor is connected to the main board through a feeding line, and the grounding end of the first button conductor is grounded; wherein,

[0012] The first input terminal of the first filtering unit is connected to the main board through a feeder. The first output terminal of the first filtering unit is grounded after being commonly connected to the grounding terminal of the first key conductor. The second output terminal of the first filtering unit is connected to the feeding terminal of the second key conductor;

[0013] The first input terminal of the second filtering unit is connected to the second output terminal of the first filtering unit. The first output terminal of the second filtering unit is grounded after being commonly connected to the grounding terminal of the second key conductor and then connected to the second input terminal of the first filtering unit. The second output terminal of the second filtering unit is connected to the feeding terminal of the third key conductor. The second input terminal of the second filtering unit is connected to the grounding terminal of the third key conductor.

[0014] Optionally, the first filtering unit includes a first decoupling element, a second decoupling element, and a third decoupling element. The second filtering unit includes a fourth decoupling element and a fifth decoupling element:

[0015] One end of the first decoupling element is grounded after being commonly connected to the grounding terminal of the first key conductor;

[0016] One end of the second decoupling element and one end of the third decoupling element jointly serve as the first input terminal of the first filtering unit and are connected to the main board through a feeder. The other end of the second decoupling element is connected to the feeding terminal of the second key conductor;

[0017] One end of the fourth decoupling element is connected to the grounding terminal of the second key conductor and then connected to the other end of the first decoupling element. One end of the fourth decoupling element is connected to the grounding terminal of the third key conductor;

[0018] One end of the fifth decoupling element is connected to the other end of the third decoupling element. The other end of the fifth decoupling element is connected to the feeding terminal of the third key conductor.

[0019] Optionally, the first decoupling element, the second decoupling element, the fourth decoupling element, and the fifth decoupling element all adopt inductors. The inductance values of the first decoupling element, the second decoupling element, the fourth decoupling element, and the fifth decoupling element are between 30 - 68 nh;

[0020] The third decoupling element adopts a resistor with a resistance value of 0 Ω, or the third decoupling element adopts an inductor with an inductance value of 0 nh.

[0021] Optionally, the inductance values of the first decoupling element, the second decoupling element, the fourth decoupling element, and the fifth decoupling element are all 47 nh.

[0022] Optionally, the target frequency band is 1.71 - 2.7 GHz.

[0023] According to a second aspect of the embodiments of the present disclosure, a terminal device is provided, including:

[0024] A main board;

[0025] A side key circuit board as in the first aspect of the embodiments of the present disclosure;

[0026] And an antenna radiator disposed near the side key circuit board.

[0027] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:

[0028] In the present disclosure, a first filtering unit is provided in a first area of the trace on the side key circuit board, and a second filtering unit is provided in a second area of the trace. The distance between the first area and the main board end of the side key circuit board is less than the distance between the second area and the main board end, so that the first filtering unit can adjust the frequency of the high-frequency harmonics generated by the trace to be greater than or equal to the maximum frequency value in the target frequency band, and the second filtering unit can adjust the frequency of the low-frequency harmonics generated by the trace to be less than or equal to the minimum frequency value in the target frequency band. In this way, through two-stage filtering provided in different areas of the side key circuit board from the main board end, the harmonics generated by the trace on the side key circuit board can be modulated outside the target frequency band. Thus, the frequency influence on the antenna radiator near the side key circuit board can be reduced, and the radiation performance of the antenna radiator near the side key circuit board can be effectively improved.

[0029] 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

[0030] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present disclosure, and are used together with the specification to explain the principles of the present disclosure.

[0031] Figure 1 It is a schematic curve diagram of the radiation efficiency of the antenna radiator near the side key circuit board before tuning.

[0032] Figure 2 It is a schematic structural diagram of a side key circuit board shown according to an exemplary embodiment.

[0033] Figure 3 It is a schematic circuit structure diagram of a side key circuit board shown according to an exemplary embodiment.

[0034] Figure 4 It is a schematic curve diagram of the radiation efficiency of the antenna radiator near the side key circuit board after the side key circuit board of the present disclosure is provided.

[0035] Figure 5It is a block diagram of a terminal device shown according to an exemplary embodiment. Detailed implementation mode

[0036] Here, the exemplary embodiments will be described in detail, and the examples 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 the implementation manners consistent with the present disclosure. On the contrary, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0037] With the development of communication technology, the antenna design environment inside mobile terminals has been gradually compressed. Generally speaking, the metal parts inside mobile terminals will form certain harmonics in the antenna band of nearby antenna radiators, and the bad harmonics will affect the antenna performance. An antenna is arranged near the side key of the mobile terminal. The side key, as a single device containing metal traces, is relatively close to the antenna, and the length harmonic frequency of the traces will fall within the medium and high frequency bands of the antenna, affecting the medium and high frequency performance of the antenna near the side key circuit board. As Figure 1 shown, the radiation efficiency curves and total efficiency curves of the first antenna and the second antenna near the side key are respectively shown. Among them, curve A is the radiation efficiency curve of the first antenna, curve B is the total efficiency curve of the first antenna, curve C is the total efficiency curve of the second antenna, and curve D is the radiation efficiency curve of the second antenna. It can be seen that harmonics are generated within the medium and high frequency band (MHB) where the antenna performance is optimal, and have a greater impact on the antenna performance.

[0038] See Figures 2 - 4 , in the embodiment of the present disclosure, by setting filtering units for filtering out clutter in different areas on the side key circuit board, and taking advantage of the different sensitivities to harmonics at different positions, the frequency of the harmonics generated by the traces on the side key circuit board is modulated outside the target frequency band. The specific solution is as follows.

[0039] A side key circuit board, with an antenna radiator 100 near the side key circuit board. The main board end 200 of the side key circuit board is used to connect to the main board of the terminal device. The side key circuit board includes:

[0040] A first filtering unit 301, arranged in the first area of the trace on the side key circuit board. The first filtering unit 301 is used to adjust the frequency of the high-frequency harmonics generated by the trace to the first frequency;

[0041] A second filtering unit 302, arranged in the second area of the trace. The second filtering unit 302 is used to adjust the frequency of the low-frequency harmonics generated by the trace to the second frequency;

[0042] Among them, the distance between the first region and the main board end 200 is less than the distance between the second region and the main board end 200. The first frequency is greater than or equal to the maximum frequency value in the target frequency band, and the second frequency is less than or equal to the minimum frequency value in the target frequency band.

[0043] Exemplarily, the side key circuit board is generally a flexible printed circuit (FPC). The internal wiring of the device is a metal part, and the key seat of the button has a chip-type metal conductor. When the user presses the button, the metal conductor receives the pressing signal and transmits it to the main board through the FPC wiring. The main board also supplies power to the side key circuit board through the FPC wiring. Due to the presence of the metal conductor and metal wiring, it has a greater impact on the radiation efficiency of the antenna radiator 100 near the side key circuit board.

[0044] Exemplarily, as Figure 2 shown, the first filtering unit 301 is within the first region of the side key circuit board, and the second filtering unit 302 is within the second region of the side key circuit board. The first region is closer to the board end, and the 1 / 4 harmonic generated is usually at a high frequency. Therefore, the first filtering unit 301 can be used to further adjust the frequency of the high-frequency harmonic to be greater than or equal to the maximum frequency value in the target frequency band, effectively modulating the high-frequency harmonic outside the target frequency band. Similarly, the second region is farther from the board end, and the 1 / 4 harmonic generated is usually at a low frequency. Therefore, the first filtering unit 301 can be used to further adjust the frequency of the low-frequency harmonic to be less than or equal to the minimum frequency value in the target frequency band, effectively modulating the low-frequency harmonic outside the target frequency band.

[0045] Exemplarily, the range of the target frequency band can be within the antenna radiation frequency band and less than or equal to the antenna radiation frequency band. For example, the antenna radiation frequency band is 1 - 3 GHz, and the range of the target frequency band is 1.5 - 2 GHz. The target frequency band can be the frequency band with the optimal antenna radiation performance, such as 1.71 - 2.7 GHz. Further, the range of the target frequency band can include the frequency band with the optimal antenna radiation performance and be greater than or equal to the frequency band with the optimal antenna radiation performance, such as 1.5 - 2.8 GHz. The target frequency band can also be a frequency band set by technicians according to actual requirements.

[0046] It should be noted here that since the first filtering unit 301 and the second filtering unit 302 are respectively used to adjust the frequency of the high-frequency harmonic and the low-frequency harmonic, if one of the filtering units is missing, there are still harmonics in the target frequency band, and the filtering effect on the harmonics in the target frequency band is not good. Therefore, here, by using the first filtering unit 301 and the second filtering unit 302, the high-frequency harmonic and the low-frequency harmonic are filtered out, which can improve the radiation performance of the antenna in the target frequency band.

[0047] In the present disclosure, a first filtering unit 301 is provided in a first area of the trace on the side key circuit board, and a second filtering unit 302 is provided in a second area of the trace. The distance between the first area and the main board end 200 of the side key circuit board is less than the distance between the second area and the main board end 200, so that the first filtering unit 301 can adjust the frequency of the high-frequency harmonics generated by the trace to be greater than or equal to the maximum frequency value in the target frequency band, and the second filtering unit 302 can adjust the frequency of the low-frequency harmonics generated by the trace to be less than or equal to the minimum frequency value in the target frequency band. In this way, through two-stage filtering provided in different areas on the side key circuit board, the harmonics generated by the trace on the side key circuit board can be modulated outside the target frequency band. Thus, the influence on the radiation efficiency of the antenna radiator 100 near the side key circuit board can be reduced, and the radiation performance of the antenna radiator 100 near the side key circuit board can be effectively improved.

[0048] In the related art, the antenna radiator 100 is used as a coupling stub to improve the antenna radiation efficiency. The length of the radiation stub is difficult to control, and it occupies the frame space of the terminal device. By using the side key circuit board of the present disclosure, it is possible to improve the performance of the frame antenna by using the side key circuit board, without occupying the frame size of the terminal device, and it is applicable to all antennas near the side key.

[0049] As an optional embodiment, the decoupling elements in the first filtering unit 301 and the second filtering unit 302 are both inductors.

[0050] Exemplarily, the decoupling element can be used for filtering. The decoupling element can be, for example, an inductor, a capacitor, a resistor, etc. These components do not have the ability to provide amplification and can maintain or reduce the amplitude of the input signal. Among them, the principle of inductor filtering is based on the selectivity of the inductor element to the signal frequency. An inductor is a passive element with the characteristic of hindering the change of current. When the current changes, the inductor will generate a back electromotive force to resist the change of the current. This characteristic enables the inductor to play a filtering role in the circuit.

[0051] Exemplarily, compared with other filtering technologies, when using inductor filtering, the inductor element has a relatively low cost and can be used economically in the circuit. And the inductor filtering has a high impedance to high-frequency signals and can effectively filter out noise and interference signals. Since the inductor element is small, it can save the space of the side key circuit board. In addition, the power consumption of the inductor filter is low and will not have too much impact on the entire circuit system.

[0052] As an optional embodiment, the first inductance value of the inductor in the first filtering unit 301 is less than the second inductance value of the inductor in the second filtering unit 302.

[0053] Exemplarily, the first filtering unit 301 is closer to the board end, and the generated 1 / 4 harmonic is usually at a high frequency. By using an inductor with a small inductance value, the high-frequency harmonic can be more effectively pushed to a frequency value greater than or equal to the maximum frequency value of the target frequency band. The second filtering unit 302 is farther from the board end, and the generated 1 / 4 harmonic is usually at a low frequency. By using an inductor with a large inductance value, the low-frequency harmonic can be more effectively pushed to a frequency value less than or equal to the minimum frequency value of the target frequency band.

[0054] In the present disclosure, by arranging filtering units in different regions on the side key circuit board, and according to the different distances between the filtering units and the main board end 200, decoupling elements in the filtering units adopt inductors with different inductance values, so that the harmonics generated by the traces of the side key circuit board can be modulated outside the target frequency band, and different inductance values loaded on the traces of the side key circuit board can excite the radiation modes of the side keys, with stronger tunability.

[0055] As an alternative embodiment, the decoupling elements in the first filtering unit 301 and the second filtering unit 302 are both resistors.

[0056] Exemplarily, in addition to inductors, the decoupling elements in the first filtering unit 301 and the second filtering unit 302 can also use resistors and capacitors. When using a resistor as the decoupling element, by loading a resistor on the side key circuit board, the resistance value of the resistor can be 1 kΩ uniformly, which can effectively filter out clutter.

[0057] Here, since the resistance value of the 1 kΩ resistor is relatively large, the overall loss of the circuit is large, which will also have a certain impact on the antenna radiation performance. Therefore, according to the actual situation, the decoupling elements in the first filtering unit 301 and the second filtering unit 302 can adopt the method of an inductor and a 0 Ω resistor or a 0 nh inductor. By selecting appropriate inductance values, quantities and connection relationships of the inductors, a decoupling element combination with a small impact on the antenna radiation frequency band can be adjusted to improve the radiation performance of the antenna.

[0058] As an alternative embodiment, the side key circuit board further includes a first key conductor 104, a second key conductor 105 and a third key conductor 106. The feeding end of the first key conductor 104 is connected to the main board through a feeder line, and the grounding end of the first key conductor 104 is grounded; wherein,

[0059] The first input end of the first filtering unit 301 is connected to the main board through a feeder line. The first output end of the first filtering unit 301 is commonly connected to the grounding end of the first key conductor 104 and then grounded. The second output end of the first filtering unit 301 is connected to the feeding end of the second key conductor 105;

[0060] The first input end of the second filtering unit 302 is connected to the second output end of the first filtering unit 301. The first output end of the second filtering unit 302 is commonly connected to the grounding end of the second key conductor 105 and then connected to the second input end of the first filtering unit 301. The second output end of the second filtering unit 302 is connected to the feeding end of the third key conductor 106. The second input end of the second filtering unit 302 is connected to the grounding end of the third key conductor 106.

[0061] Exemplarily, the main board is connected to the key conductor of the terminal device through a feeding wire, so that the main board receives the signal of the key and executes corresponding control, and the main board also feeds the key conductor. Among them, the current output by the main board is filtered by the first filtering unit 301 to remove clutter and then output to the second key conductor 105; the current output by the main board is filtered by the first filtering unit 301 and the second filtering unit 302 to remove clutter and then output to the third key conductor 106. It is possible to adjust the harmonics generated by the metal trace.

[0062] Specifically, the current output by the main board is output to the feeding end of the first key conductor 104 through the feeding wire and output through the grounding end of the first key conductor 104 via the ground wire. The current output by the main board is output to the first input end of the first filtering unit 301 through the feeding wire, output to the feeding end of the second key conductor 105 via the second output end of the first filtering unit 301, the grounding end of the second key conductor 105 is output to the second input end of the first filtering unit 301, and output through the first output end of the first filtering unit 301 via the ground wire. The current output by the main board is output to the first input end of the first filtering unit 301 through the feeding wire, output to the first input end of the second filtering unit 302 via the second output end of the first filtering unit 301, and output to the feeding end of the third key conductor 106 through the second output end of the second filtering unit 302. The grounding end of the third key conductor 106 is output to the second input end of the second filtering unit 302 and output through the first output end of the second filtering unit 302 via the ground wire.

[0063] As an optional embodiment, the first filtering unit 301 includes a first decoupling element, a second decoupling element and a third decoupling element, and the second filtering unit 302 includes a fourth decoupling element and a fifth decoupling element:

[0064] One end of the first decoupling element is commonly connected to the grounding end of the first key conductor 104 and then grounded;

[0065] One end of the second decoupling element and one end of the third decoupling element are jointly used as the first input end of the first filtering unit 301 and connected to the main board through a feeding wire. The other end of the second decoupling element is connected to the feeding end of the second key conductor 105;

[0066] One end of the fourth decoupling element is commonly connected to the ground end of the second button conductor 105 and then connected to the other end of the first decoupling element, and one end of the fourth decoupling element is connected to the ground end of the third button conductor 106;

[0067] One end of the fifth decoupling element is connected to the other end of the third decoupling element, and the other end of the fifth decoupling element is connected to the feeding end of the third button conductor 106.

[0068] Exemplarily, the current output by the main board can pass through the feeding end of the first button conductor 104 and be output through the ground wire via the ground end of the first button conductor 104. The current output by the main board can be output to the feeding end of the second button conductor 105 through the second decoupling element, and the ground end of the second button conductor 105 is output to the ground through the first decoupling element. The current output by the main board can pass through the third decoupling element and the fifth decoupling element and then be output to the feeding end of the third button conductor 106, and the ground end of the third button conductor 106 is output to the ground through the fourth decoupling element and the first decoupling element.

[0069] As an optional embodiment, the first decoupling element, the second decoupling element, the fourth decoupling element, and the fifth decoupling element all adopt inductors, and the inductance values of the first decoupling element, the second decoupling element, the fourth decoupling element, and the fifth decoupling element are between 30 - 68 nh;

[0070] The third decoupling element adopts a resistor with a resistance value of 0 Ω, or the third decoupling element adopts an inductor with an inductance value of 0 nh.

[0071] Exemplarily, after a large number of debugging tests by the inventor, the inductance values of the first decoupling element, the second decoupling element, the fourth decoupling element, and the fifth decoupling element can be between 30 - 68 nh, and the third decoupling element adopts a resistor with a resistance value of 0 Ω, or an inductor with an inductance value of 0 nh, which can effectively improve the radiation efficiency of the antenna radiator 100 near the side key circuit board.

[0072] Exemplarily, it can be as Figure 4As shown in the figure, the first curve labeled ① is the radiation efficiency curve of the antenna radiator 100 when the first decoupling element, the second decoupling element, the third decoupling element, the fourth decoupling element, and the fifth decoupling element all use 1 kΩ resistors; the second curve labeled ② is the radiation efficiency curve of the antenna radiator 100 when the first decoupling element, the second decoupling element, the third decoupling element, the fourth decoupling element, and the fifth decoupling element all use 27 nH inductors; the third curve labeled ③ is the radiation efficiency curve of the antenna radiator 100 when the first decoupling element, the second decoupling element, the fourth decoupling element, and the fifth decoupling element all use 47 nH inductors, and the third decoupling element uses a 0 Ω resistor or a 0 nH inductor. Among them, the frequencies of the harmonics in the third curve are circled by two circles. The low-frequency harmonic frequency of the first curve is less than 1 GHz, the low-frequency harmonic frequency of the third curve is around 1.5 GHz, and the high-frequency harmonic frequencies of the first curve and the third curve are both greater than 3.5 GHz. Therefore, it can be seen that the harmonic frequencies in the first curve, the second curve, and the third curve are all filtered out of the mid-high frequency band where the antenna radiator 100 has the best radiation performance. However, the low-frequency harmonics generated by the second curve are very close to the mid-high frequency band, which will affect the mid-frequency performance of the antenna radiator 100, and the use of a resistor with a relatively large resistance value in the first curve will cause losses to the circuit and also affect the radiation performance of the antenna radiator 100. Further, the highest radiation efficiency point of the antenna radiator 100 in the third curve is slightly higher than that in the first curve, with an increase of about 0.6 dB.

[0073] Therefore, as an alternative embodiment, the inductance values of the first decoupling element, the second decoupling element, the fourth decoupling element, and the fifth decoupling element are all 47 nH.

[0074] Exemplarily, according to the actual debugging situation above, the inductance values of the first decoupling element, the second decoupling element, the fourth decoupling element, and the fifth decoupling element can be set to 47 nH, and the third decoupling element uses a 0 Ω resistor, which can further improve the radiation performance of the antenna radiator 100 near the side key circuit board.

[0075] As an alternative embodiment, the target frequency band is 1.71 - 2.7 GHz.

[0076] Exemplarily, the frequency band with the best radiation performance of the antenna radiator 100 near the side key circuit board can be used as the target frequency band. Here, the target frequency band can be set to 1.71 - 2.7 GHz, so that devices with less loss to the circuit can be used to ensure the radiation performance of the antenna. In addition, it can also be set according to the actual radiation performance of the antenna.

[0077] The present disclosure also provides a specific implementation manner. Refer to Figures 2 - 3, a side key circuit board, where the side keys are the volume up key 101, volume down key 102, and power key 103 on the terminal device. The side key circuit board includes:

[0078] A volume up key conductor, and the feeding end of the volume up key conductor is connected to the main board through a feeder line;

[0079] A volume down key conductor;

[0080] A power key conductor;

[0081] An inductor L1, and one end of the inductor L1 is commonly connected to the grounding end of the volume up key conductor and then grounded;

[0082] An inductor L2 and a resistor R. One end of the inductor L2 and one end of the resistor R are both connected to the main board through feeder lines, and the other end of the inductor L2 is connected to the feeding end of the volume down key conductor;

[0083] An inductor L3. One end of the inductor L3 is commonly connected to the grounding end of the volume down key conductor and then connected to the other end of the inductor L1, and one end of the inductor L3 is connected to the grounding end of the power key conductor;

[0084] An inductor L4. One end of the inductor L4 is connected to the other end of the resistor R, and the other end of the inductor L4 is connected to the feeding end of the power key conductor.

[0085] Specifically, the inductor L1, inductor L2, and resistor R here serve as the first filtering unit 301 and are arranged in the first area of the side key circuit board. The inductor L3 and inductor L4 serve as the second filtering unit 302 and are arranged in the second area of the side key circuit board. The first area is closer to the main board end 200, and the second area is farther from the main board end 200.

[0086] Specifically, the current output by the main board end 200 is output to the feeding end of the volume up key conductor through a feeder line and is output through the grounding end of the volume up key conductor via a ground wire. The current output by the main board end 200 can be output to the feeding end of the volume down key conductor through the inductor L2, and the grounding end of the volume down key conductor is output to the ground through the inductor L1. The current output by the main board end 200 can be output to the feeding end of the power key conductor after passing through the resistor R and inductor L4, and the grounding end of the power key conductor is output to the ground through the inductor L3 and inductor L1.

[0087] Specifically, the inductance values of the inductor L1, inductor L2, inductor L3, and inductor L4 are between 30 - 68 nh. Further, the inductance values of the inductor L1, inductor L2, inductor L3, and inductor L4 are 47 nh. The resistance value of the resistor R is 0 Ω.

[0088] As an optional embodiment, the present disclosure further provides a terminal device, including:

[0089] A main board;

[0090] The side key circuit board provided by an embodiment of the present disclosure;

[0091] And an antenna radiator 100 disposed near the side key circuit board.

[0092] Figure 5 It is a block diagram of a terminal device 500 shown according to an exemplary embodiment. For example, the terminal device 500 may be a mobile phone, a tablet device, a personal digital assistant, etc.

[0093] Referring to Figure 5 , the terminal device 500 may include one or more of the following components: a processing component 502, a memory 504, a power supply component 506, a multimedia component 508, an audio component 510, an input / output interface 512, a sensor component 514, and a communication component 516.

[0094] The processing component 502 generally controls the overall operation of the terminal device 500, such as operations associated with display, telephone calls, data communication, camera operations, and recording operations. The processing component 502 may include one or more processors 520 to execute instructions. In addition, the processing component 502 may include one or more modules to facilitate the interaction between the processing component 502 and other components. For example, the processing component 502 may include a multimedia module to facilitate the interaction between the multimedia component 508 and the processing component 502.

[0095] The memory 504 is configured to store various types of data to support the operation of the terminal device 500. Examples of such data include instructions for any application or method operating on the terminal device 500, contact data, phone book data, messages, pictures, videos, etc. The memory 504 may 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, a magnetic disk, or an optical disk.

[0096] The power supply component 506 provides power to various components of the terminal device 500. The power supply component 506 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the terminal device 500.

[0097] The multimedia component 508 includes a screen that provides an output interface between the terminal device 500 and the user. 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 signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensors can sense not only the boundaries of a touch or swipe action but also detect the duration and pressure associated with the touch or swipe operation. In some embodiments, the multimedia component 508 includes a front camera and / or a rear camera. When the terminal device 500 is in an operation mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front camera and the rear camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.

[0098] The audio component 510 is configured to output and / or input audio signals. For example, the audio component 510 includes a microphone (MIC) that is configured to receive external audio signals when the terminal device 500 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals can be further stored in the memory 504 or transmitted via the communication component 516. In some embodiments, the audio component 510 further includes a speaker for outputting audio signals.

[0099] The input / output interface 512 provides an interface between the processing component 502 and a peripheral interface module, and the peripheral interface module can be a keyboard, a click wheel, buttons, etc. These buttons can include but are not limited to: a home button, a volume button, a power button, and a lock button.

[0100] The sensor component 514 includes one or more sensors for providing an assessment of the status of various aspects of the terminal device 500. For example, the sensor component 514 can detect the on / off state of the terminal device 500, the relative positioning of components, such as the display and the keypad of the terminal device 500. The sensor component 514 can also detect a change in the position of the terminal device 500 or a component of the terminal device 500, the presence or absence of user contact with the terminal device 500, the orientation or acceleration / deceleration of the terminal device 500, and the temperature change of the terminal device 500. The sensor component 514 can include a proximity sensor configured to detect the presence of nearby objects without any physical contact. The sensor component 514 can also include a light sensor, such as a CMOS or a CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 514 can further include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0101] The communication component 516 is configured to facilitate communication between the terminal device 500 and other devices in a wired or wireless manner. The terminal device 500 can access a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 516 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 516 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.

[0102] In an exemplary embodiment, the terminal device 500 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.

[0103] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided. For example, the non-transitory computer-readable storage medium can be a ROM, Random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0104] Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the present disclosure. The present disclosure is intended to cover any variations, uses, or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not disclosed by the present disclosure. The specification and embodiments are only regarded as exemplary, and the true scope and spirit of the present disclosure are pointed out by the following claims.

[0105] It should be understood that the present disclosure is not limited to the exact structures already described 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. A side key circuit board, characterized in that, there is an antenna radiator near the side key circuit board, the main board end of the side key circuit board is used to connect to the main board of the terminal device, and the side key circuit board includes: A first filtering unit, arranged in a first area of the trace on the side key circuit board, the first filtering unit is used to adjust the frequency of the high-frequency harmonics generated by the trace to a first frequency; A second filtering unit, arranged in a second area of the trace, the second filtering unit is used to adjust the frequency of the low-frequency harmonics generated by the trace to a second frequency; wherein, the distance between the first area and the main board end is less than the distance between the second area and the main board end, the first frequency is greater than or equal to the maximum frequency value in the target frequency band, and the second frequency is less than or equal to the minimum frequency value in the target frequency band.

2. The side key circuit board according to claim 1, characterized in that, The decoupling elements in the first filtering unit and the second filtering unit are both inductors.

3. The side key circuit board according to claim 2, characterized in that, The first inductance value of the inductor in the first filtering unit is less than the second inductance value of the inductor in the second filtering unit.

4. The side key circuit board according to claim 1, characterized in that, The decoupling elements in the first filtering unit and the second filtering unit are both resistors.

5. The side key circuit board according to claim 1, characterized in that, The side key circuit board further includes a first key conductor, a second key conductor and a third key conductor. The feeding end of the first key conductor is connected to the main board through a feeding wire, and the grounding end of the first key conductor is grounded; wherein, The first input end of the first filtering unit is connected to the main board through a feeding wire, the first output end of the first filtering unit is connected to the grounding end of the first key conductor and then grounded, and the second output end of the first filtering unit is connected to the feeding end of the second key conductor; The first input end of the second filtering unit is connected to the second output end of the first filtering unit, the first output end of the second filtering unit is connected to the grounding end of the second key conductor and then connected to the second input end of the first filtering unit, the second output end of the second filtering unit is connected to the feeding end of the third key conductor, and the second input end of the second filtering unit is connected to the grounding end of the third key conductor.

6. The side key circuit board according to claim 5, characterized in that, The first filtering unit includes a first decoupling element, a second decoupling element and a third decoupling element, and the second filtering unit includes a fourth decoupling element and a fifth decoupling element: One end of the first decoupling element is connected to the grounding end of the first key conductor and then grounded; One end of the second decoupling element and one end of the third decoupling element together serve as the first input end of the first filtering unit and are connected to the main board through a feeding wire, and the other end of the second decoupling element is connected to the feeding end of the second key conductor; One end of the fourth decoupling element is commonly connected to the ground end of the second button conductor and then connected to the other end of the first decoupling element, and one end of the fourth decoupling element is connected to the ground end of the third button conductor; One end of the fifth decoupling element is connected to the other end of the third decoupling element, and the other end of the fifth decoupling element is connected to the feeding end of the third button conductor.

7. The side button circuit board according to claim 6, characterized in that the first decoupling element, the second decoupling element, the fourth decoupling element and the fifth decoupling element all adopt inductors, and the inductance values of the first decoupling element, the second decoupling element, the fourth decoupling element and the fifth decoupling element are between 30-68 nh; the third decoupling element adopts a resistor with a resistance value of 0 Ω, or the third decoupling element adopts an inductor with an inductance value of 0 nh.

8. The side button circuit board according to claim 7, characterized in that the inductance values of the first decoupling element, the second decoupling element, the fourth decoupling element and the fifth decoupling element are all 47 nh.

9. The side button circuit board according to any one of claims 1-8, characterized in that the target frequency band is 1.71-2.7 GHz.

10. A terminal device, characterized in that it includes: a main board; the side button circuit board according to any one of claims 1-9; and an antenna radiator arranged near the side button circuit board.

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