Antenna switching circuit, antenna system and networking equipment
Through the design of two-piece switches and matching circuits, the layout difficulty and high cost problems caused by the 4-piece switch are solved, and effective coverage and performance improvements in the medium and high frequency bands are achieved.
Patent Information
- Application Number
- CN202421698554.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-17
- Publication Date
- 2025-08-05
- Estimated Expiration
- 2034-07-17
AI Technical Summary
In the prior art, the antenna switch circuit uses a 4-bit switch, resulting in difficulty in layout of the PCB board, complex switching logic, high cost and poor performance.
Using two-cut switches, peripheral matching circuits, high-frequency and medium-frequency frequency modulation matching parts, the first and second switch components are closed in the high-frequency and medium-frequency frequency bands, respectively, to reduce the number of matching parts and space.
Effectively cover the mid-frequency and high-frequency bands, reduce the difficulty of PCB board layout, simplify switching logic, reduce costs, and improve antenna performance.
Smart Images
Figure CN223194008U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of antennas, and in particular to a switching circuit for an antenna, an antenna system, and a networking device. Background Art
[0002] With the development of intelligent terminals with communication functions such as mobile phones, the functions of intelligent terminals have become more and more complex, resulting in a more tense internal space of the intelligent terminal, a more extreme antenna layout, and compression of the layout area of the PCB (Printed Circuit Board) and the clearance of the antenna (the area around the antenna that needs to be kept unobstructed or interference-free (without placing a metal layer) to ensure that the antenna can effectively radiate and receive electromagnetic waves). In addition, the structure of the intelligent terminal also needs to meet the requirement of no interference to reduce the influence of metal on the antenna performance. It can be seen that the antenna performance is affected by both the PCB board and the structure. Since the layout of the PCB board and the structure becomes more and more extreme with iterations, the antenna performance will instead decrease with iterations. In this case, it is difficult for the antenna to cover all frequency bands, so the antenna bandwidth is poor. And, in order to cover more frequency bands, antenna switch tuning is usually adopted. Commonly used antenna switches are 4*SPST (4 independent Single Pole Single Throw switches, Four Single Pole Single Throw) and SP4T (a switch with one common port and four independent switching ports, Single Pole Four Throw), both of which are 4-pole switches.
[0003] It can be seen that in the related art, due to the use of a 4-pole switch, the area of the antenna switch is very large, which will increase the difficulty of PCB board layout; and the switching logic is complex, resulting in a need for more matching components, which will also cause multiple antenna losses and poor performance; at the same time, the cost of using a 4-pole switch is high. Summary of the Utility Model
[0004] The present disclosure provides a switching circuit for an antenna to solve the deficiencies in the related art.
[0005] According to the first aspect of the embodiments of the present disclosure, a switching circuit for an antenna is proposed, including: a two-pole switch, a peripheral matching circuit for connecting to the feeding point of the antenna, a high-frequency frequency modulation matching component, and an intermediate-frequency frequency modulation matching component;
[0006] The high-frequency frequency modulation matching component is connected to the peripheral matching circuit through the first switch component in the two-pole switch, and is used to make the antenna operate in the high-frequency band when the first switch component is closed;
[0007] The intermediate-frequency frequency modulation matching component is connected to the peripheral matching circuit through the second switch component in the two-pole switch, and is used to make the antenna operate in the intermediate-frequency band when the second switch component is closed.
[0008] Optionally, the peripheral matching circuit includes a first capacitor, a second capacitor, a third capacitor, a first inductor, and a second inductor;
[0009] The first capacitor, the second capacitor, and the second inductor are connected in series with each other, and one end of the first capacitor that is not connected to the second capacitor is connected to the feeding point, and one end of the second inductor that is not connected to the second capacitor is for connecting to a signal source;
[0010] One end of the first inductor is grounded, and the other end is connected to the first capacitor and the second capacitor. One end of the third capacitor is grounded, and the other end is connected to the signal source.
[0011] Optionally, the high-frequency frequency modulation matching component includes a high-frequency adjustment capacitor, and the first switch component includes a first main path connection switch;
[0012] The high-frequency adjustment capacitor and the first main path connection switch are connected in series to form a first branch, and the first branch is connected in parallel with the second capacitor.
[0013] Optionally, the first switch component further includes a first grounding switch for grounding;
[0014] The first grounding switch is located at one end of the first branch close to the signal source, the high-frequency adjustment capacitor is located at one end of the first branch far from the signal source, and the first grounding switch is connected to the first main path connection switch.
[0015] Optionally, the value of the high-frequency adjustment capacitor is between 1 pF and 2 pF.
[0016] Optionally, the intermediate-frequency frequency modulation matching component includes an intermediate-frequency adjustment inductor component, and the second switch component includes a second main path connection switch;
[0017] The intermediate-frequency adjustment inductor component and the second main path connection switch are connected in series to form a second branch, and one end of the second branch is grounded, and the other end is connected to the first capacitor and the second capacitor, for making the antenna operate in a first intermediate-frequency band when the second main path connection switch is closed.
[0018] Optionally, the second switch component further includes a second grounding switch for grounding. The intermediate-frequency adjustment inductor component includes: a first intermediate-frequency adjustment inductor connected to the first capacitor and the second capacitor, and a second intermediate-frequency adjustment inductor connected to the grounding end;
[0019] The second grounding switch is connected between the first intermediate-frequency adjustment inductor and the second intermediate-frequency adjustment inductor, for making the antenna operate in a second intermediate-frequency band when the second main path connection switch and the second grounding switch are closed.
[0020] Optionally, the size of the first intermediate frequency adjustment inductor is between 3.5 nH and 4.5 nH, and the size of the second intermediate frequency adjustment inductor is between 9.5 nH and 10.5 nH.
[0021] According to a second aspect of the embodiments of the present disclosure, an antenna system is provided, including an antenna and a switch circuit as described in any one of the foregoing embodiments, and a peripheral matching circuit is connected to the feeding point of the antenna.
[0022] According to a second aspect of the embodiments of the present disclosure, a networking device is provided, including the antenna system as described in any one of the foregoing embodiments.
[0023] The technical solutions provided by the embodiments of the present disclosure may include the following beneficial effects:
[0024] As can be seen from the above embodiments, the present disclosure provides a two-way switch, a peripheral matching circuit connected to the feeding point of the antenna, a high-frequency frequency modulation matching component, and an intermediate frequency frequency modulation matching component; the high-frequency frequency modulation matching component is connected to the peripheral matching circuit through a first switch component in the two-way switch, and is configured to make the antenna operate in a high-frequency band when the first switch component is closed; the intermediate frequency frequency modulation matching component is connected to the peripheral matching circuit through a second switch component in the two-way switch, and is configured to make the antenna operate in an intermediate frequency band when the second switch component is closed. Thus, by closing the first switch component and the second switch component in the two-way switch, the antenna can operate in the intermediate frequency band and the high-frequency band respectively, and further can effectively cover the intermediate frequency band and the high-frequency band. At the same time, since the size of the two-way switch is significantly smaller than that of the four-way switch, and the number of components included in the peripheral matching circuit required by the two-way switch can be less than the number of components included in the peripheral matching circuit required by the four-way switch, the space occupied by the switch circuit of the antenna is reduced, thereby reducing the area occupied by the antenna switch circuit on the PCB board, and further reducing the difficulty of PCB board layout; and the switching logic of the two-way switch is simple, thereby reducing the number of required matching components, reducing the multiple losses of the antenna, and improving the antenna performance; and the cost of the two-way switch is low, which can effectively reduce the production cost; therefore, through the switch circuit of the present embodiment, the technical problems existing in the switch circuit of the antenna in the related art, such as the difficulty of PCB board layout, complex switching logic, resulting in more required matching components, and thus causing general performance and high cost due to multiple losses of the antenna, can be effectively overcome.
[0025] 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. Description of the Drawings
[0026] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0027] Figure 1 It is a schematic diagram of the switch topology of an old antenna system using a 4-way switch in the related art.
[0028] Figure 2 It is a schematic diagram of the switch topology of an antenna system shown according to an embodiment of the present application.
[0029] Figure 3A For the case of Figure 1 the schematic diagram of the switch topology of the old antenna system using the 4-way switch in the related art as shown, the standing wave and efficiency schematic diagrams.
[0030] Figure 3B For the case of Figure 2 the schematic diagram of the switch topology of the new antenna system as shown, the standing wave and efficiency schematic diagrams. Specific Embodiments
[0031] To make the purpose, technical solutions and advantages of the present disclosure clearer, the following will further elaborate on the present disclosure in combination with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and do not limit the protection scope of the present disclosure.
[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present disclosure belongs. The terms used in the description of the present disclosure in this specification are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.
[0033] With the development of intelligent terminals with communication functions such as mobile phones, the functions of intelligent terminals have become increasingly complex, resulting in a more and more tense internal space of intelligent terminals, a more and more extreme antenna layout, and a compression of the layout area of the PCB (Printed Circuit Board) and the clearance of the antenna. In addition, the structure of the intelligent terminal also needs to meet the requirement of no interference to reduce the impact of metal on the antenna performance. It can be seen that the antenna performance is affected by both the PCB board and the structure. Since there are more and more functions in networking devices such as intelligent terminals, there are also more and more components corresponding to different functions to be set on the PCB board. However, the intelligent terminal also needs to maintain a good hand-holding experience, appearance, and structure, etc. Therefore, the components in the internal PCB board of the networking device are getting closer and closer to each other, so the antenna performance will decrease with iteration. In this case, it is difficult for the antenna to cover all frequency bands, so the antenna bandwidth is poor. And in order to cover more frequency bands, antenna switch tuning is usually adopted in the related technology. The commonly used antenna switches are 4*SPST and SP4T, both of which are 4-pole switches.
[0034] It can be seen that in the related technology, due to the use of 4-pole switches, the area of the antenna switch is very large, which will increase the difficulty of PCB board layout; and the switching logic is complex, resulting in a need for more matching components, which will also cause multiple antenna losses and general performance; the cost is relatively high.
[0035] As Figure 1 shown in the related technology, a switching topology schematic diagram of an old antenna system using a 4-pole switch is provided, which includes a conventional inverted-F antenna 11 and a parasitic antenna 12. The parasitic antenna 12 refers to an antenna element in this antenna system that is not directly connected to the feed point (i.e., point A), but interacts with the inverted-F antenna (driving element) 11 and affects the performance of the main antenna through electromagnetic induction or coupling. The antenna feed point is located in the middle of the inverted-F antenna 11, and a parasitic antenna 12 is added at the lower end to improve the standing wave depth and radiation efficiency of the inverted-F antenna 11. In this old antenna system, three-pole parallel inductance tuning and one-pole series capacitance tuning are adopted. That is, by closing SW11, SW12, and SW13 respectively, the inductors L11, L12, and L13 are respectively connected in parallel with the inverted-F antenna, and by closing SW14, the capacitor C4 is respectively connected in series to the circuit where the inverted-F antenna 11 is located.
[0036] In the related art, when switches SW11 to SW14 are all turned off, the frequency bands in which the antenna operates are B3_TX and B41. Among them, B3_TX refers to the transmit (TX) part in LTE band B3. LTE band B3 corresponds to the 1800 MHz band defined in the international mobile communication standard. Its specific frequency range is as follows: downlink (DL): 1805 MHz to 1880 MHz, uplink (UL): 1710 MHz to 1785 MHz. B3_TX specifically refers to the uplink part in this band B3 for a mobile device to send signals to the base station, that is, the frequency range of 1710 MHz to 1785 MHz. B41 is an identifier of the LTE (Long Term Evolution) band. It corresponds to the 2.5 GHz band, and the specific range is 2496 MHz to 2690 MHz. It is a TDD (Time Division Duplexing) band, which means that the uplink (transmission from the device to the base station) and the downlink (transmission from the base station to the device) use the same frequency range and are distinguished by time.
[0037] When switch SW11 is closed, the frequency bands in which the antenna operates are B3_RX and B41. Among them, B3_RX refers to the receive (RX) part in LTE band B3. In B3_RX, "RX" represents receive, which means that the band B3_RX is used for data transmission from the base station to the mobile device, that is, the downlink. Therefore, B3_RX specifically refers to the frequency range of 1805 MHz to 1880 MHz, which is the frequency band for the base station to send signals to the mobile device.
[0038] When switch SW12 is closed, the frequency band in which the antenna operates is B1_TX. B1_TX refers to the transmit (abbreviated as TX) part in LTE band B1. B1 band is an FDD (Frequency Division Duplexing) band, which means that the uplink and the downlink use different frequency ranges. The frequency range of B1 band is as follows: uplink (UL): 1920 MHz to 1980 MHz, downlink (DL): 2110 MHz to 2170 MHz. Therefore, B1_TX refers to the frequency range of the uplink, that is, the frequency range of 1920 MHz to 1980 MHz, which is the frequency band for the mobile device to send signals to the base station.
[0039] When the switch SW13 is closed, the operating frequency band of the antenna is B1_RX. B1_RX refers to the receive (RX for short) part in LTE band B1. Therefore, B1_RX refers to the frequency range of the downlink, that is, 2110 MHz to 2170 MHz, which is the frequency band for the base station to send signals to the mobile device.
[0040] When the switch SW14 is closed, the operating frequency band of the antenna is the high-frequency B40 band. Among them, the high-frequency B40 band refers to the frequency band used in the 4G LTE network. The high-frequency B40 band usually refers to the frequency range of 2300 MHz to 2400 MHz.
[0041] It can be seen that in the related technology, in order to cover bands B1, B3, B40, and B41, five different switching methods are required to achieve. Therefore, a 4-pole switch is needed. However, the 4-pole switch occupies a large area. Furthermore, there are difficulties in the PCB layout in the switch circuit of the antenna in the related technology, and the switching logic is complex, resulting in the need for more matching components. Thus, it will also cause multiple losses of the antenna, resulting in poor performance and high costs.
[0042] Based on this, the present disclosure provides a switch circuit applied to an antenna. By closing the first switch component and the second switch component in the two-pole switch, it can work in the intermediate frequency band and the high-frequency band respectively. Furthermore, it can effectively cover the intermediate frequency band and the high-frequency band. At the same time, since the size of the two-pole switch is significantly smaller than that of the four-pole switch, and the number of components included in the peripheral matching circuit required for the two-pole switch can be less than the number of components included in the peripheral matching circuit required for the four-pole switch. Furthermore, the space occupied by the switch circuit of this antenna can be reduced, thereby reducing the area occupied by the antenna switch circuit on the PCB. Furthermore, the switching logic of the two-pole switch is simple, thereby reducing the number of required matching components. Thus, it can effectively overcome the problems in the related technology, such as the difficulty in the PCB layout in the switch circuit of the antenna, the complex switching logic, resulting in the need for more matching components, and thus causing multiple losses of the antenna, resulting in general performance and high costs.
[0043] To better understand the switch circuit of the antenna of the present disclosure, it is described through an antenna system to which the switch circuit is applied.
[0044] As Figure 2 shown, it is a schematic diagram of the switch topology of the switch circuit of the antenna using a 2-pole switch shown in some embodiments.
[0045] As Figure 2As shown, in the disclosed embodiment, a switching circuit for an antenna is provided. The switching circuit for the antenna includes: a double-pole switch, a peripheral matching circuit for connecting to the feeding point of the antenna, a high-frequency frequency modulation matching component, and an intermediate-frequency frequency modulation matching component; the high-frequency frequency modulation matching component is connected to the peripheral matching circuit through the first switch component in the double-pole switch, and is used to make the antenna operate in the high-frequency band when the first switch component is closed; the intermediate-frequency frequency modulation matching component is connected to the peripheral matching circuit through the second switch component in the double-pole switch, and is used to make the antenna operate in the intermediate-frequency band when the second switch component is closed.
[0046] In this embodiment, the double-pole switch contains two independent switch blades or contact points, and can control the switching of two independent circuits or two lines simultaneously. The double-pole switch is used to control the disconnection and connection of the two-wire circuit in the antenna system in this embodiment. Further, in this embodiment, the double-pole switch can be a double-pole double-throw switch.
[0047] The peripheral matching circuit is a circuit connected to the antenna feeding point B. As an optional embodiment, the peripheral matching circuit includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a first inductor L1, and a second inductor L2; the first capacitor C1, the second capacitor C2, and the second inductor L2 are connected in series, and the end of the first capacitor not connected to the second capacitor is connected to the feeding point, and the end of the second inductor not connected to the second capacitor is used to connect to the signal source F; one end of the first inductor L1 is grounded, and the other end is connected to the first capacitor C1 and the second capacitor C2, and one end of the third capacitor C3 is grounded, and the other end is connected to the signal source F. That is to say, the peripheral matching circuit is a filter network composed of capacitors and inductors: the signal source F first passes through the third capacitor C3 and the second inductor L2. The third capacitor C3 acts as a bypass capacitor and filters out most of the high-frequency noise, allowing DC or low-frequency signals to pass. The second inductor L2 acts as a series inductor and generates inductive reactance to high-frequency signals, blocking high-frequency signals from passing, but allowing low-frequency signals to pass. Next, the signal passes through the filter network composed of the first capacitor C1, the second capacitor C2, and the first inductor L1. The first capacitor C1 and the second capacitor C2 act as series capacitors and form the characteristics of a high-pass filter according to their capacitive reactance and frequency, allowing high-frequency signals to pass while blocking low-frequency signals. The first inductor L1 acts as an inductor in parallel with the first capacitor C1 and the second capacitor C2, and presents low inductive reactance at high frequencies, forming a low-pass filter effect with the first capacitor C1 and the second capacitor C2, allowing low-frequency signals to pass while blocking high-frequency signals. However, since the first capacitor C1 and the second capacitor C2 are in series, the first inductor L1 is actually in parallel with the equivalent capacitance of the first capacitor C1 and the second capacitor C2, so the entire network behaves as a band-pass filter at a certain frequency, allowing signals within a specific frequency range to pass while suppressing signals of other frequencies.
[0048] Output signal changes In summary, after the signal output by the signal source passes through this peripheral matching circuit, the following changes will occur:
[0049] 1. High-frequency filtering: The combination of the third capacitor C3 and the second inductor L2 filters out the high-frequency components of the signal output by the signal source F.
[0050] 2. Band-pass filtering: The network formed by the first capacitor C1, the second capacitor C2, and the first inductor L1 further filters the signal, allowing only signals within a specific frequency range to pass. This frequency range depends on the values of the first capacitor C1, the second capacitor C2, and the first inductor L1.
[0051] 3. Output signal: The signal reaching the feeding point will be the signal after the above filtering process, which is characterized by removing high-frequency noise and some low-frequency signals, and only retaining the signals within the passband of the band-pass filter. Therefore, the signal finally output to the feeding point will be band-pass filtered within a specific frequency range, and its frequency characteristics depend on the specific values of the capacitors and inductors in the circuit. In this embodiment, when the first capacitor C1 is 2 pF, the second capacitor C2 is 1.5 pF, the third capacitor is 1.5 pF, the first inductor L1 is 3 nH, the second inductor L2 is 2 nH, and both SW1 and SW2 are not closed, the operating frequency bands of the antenna are B3_TX and B41.
[0052] Furthermore, the switch circuit in this embodiment is a switch circuit for tuning a medium-high-frequency antenna. That is, the antenna connected to the peripheral matching circuit is a medium-high-frequency antenna.
[0053] As an optional embodiment, the high-frequency frequency modulation matching component includes a high-frequency adjustment capacitor C4, and the first switch component includes a first main path connection switch; the high-frequency adjustment capacitor and the first main path connection switch are connected in series to form a first branch, and the first branch is connected in parallel with the second capacitor. That is, the first switch component includes a first main path connection switch SW1. Optionally, SW1 can be the switch connecting pin RF3 and pin RF2 in a double-pole switch. Furthermore, the high-frequency adjustment capacitor C4 can be connected to any one of the pins RF2 or RF3, as long as the first branch formed by the series connection of the high-frequency adjustment capacitor C4 and the first main path connection switch is connected in parallel with the second capacitor C2.
[0054] When the first main path connection switch SW1 is turned on, the high-frequency adjustment capacitor C4 and the second capacitor C2 are connected in parallel with each other, and the equivalent capacitance increases, enabling the antenna to operate in the high-frequency bands (i.e., B40 band and B41 band).
[0055] It can be seen that by turning on the first main path connection switch SW1, the antenna can operate in the high-frequency bands including the B40 band and the B41 band, thereby simplifying the number of matching components required in the high-frequency bands, and further reducing the occupied space of the switch circuit on the PCB board.
[0056] As an optional embodiment, the first switch component further includes a first grounding switch SW3 for grounding; the first grounding switch SW3 is located at one end of the first branch close to the signal source, the high-frequency tuning capacitor C4 is located at one end of the first branch far from the signal source, and the first grounding switch SW3 is connected to the first main path connection switch SW1. That is to say, the first switch component simultaneously includes the first grounding switch SW3 and the first main path connection switch SW1. Optionally, the first grounding switch SW3 can be disposed between the first main path connection switch SW1 and the second inductor L2, and the first grounding switch SW3 can also be disposed between the first main path connection switch SW1 and the high-frequency tuning capacitor C4. When the first grounding switch SW3 adopts any of the above setting methods, as long as the first grounding switch SW3 is turned on, regardless of whether the high-frequency tuning capacitor C4 is connected in parallel with the second capacitor C2 through the first main path connection switch SW1, the second capacitor C2 cannot be connected in series into the peripheral matching circuit. Moreover, after the second inductor L2 is grounded through the first grounding switch SW3, the antenna cannot operate. Since the antenna in this embodiment is a medium-high frequency antenna, by closing and grounding the first grounding switch SW3, the medium-high frequency antenna can be made inoperable, thereby reducing the interference to the low-frequency antenna.
[0057] As an optional embodiment, the value of the high-frequency tuning capacitor is between 1 pF and 2 pF. Further, the value of the high-frequency tuning capacitor can be 1.5 pF.
[0058] As an optional embodiment, the intermediate-frequency frequency modulation matching component includes an intermediate-frequency adjustment inductor component, and the second switch component includes a second main path connection switch; the intermediate-frequency adjustment inductor component and the second main path connection switch are connected in series to form a second branch, and one end of the second branch is grounded and the other end is connected to the first capacitor and the second capacitor, for making the antenna operate in the first intermediate-frequency band when the second main path connection switch is closed. That is to say, the second switch component includes a second main path connection switch SW2. Optionally, SW2 can be the switch connecting the pin RF1 and the pin RF4 in a double-pole switch. Further, the intermediate-frequency adjustment inductor component can be connected to at least one of the pins RF1 and RF4, as long as it satisfies that the second branch formed by the series connection of the intermediate-frequency adjustment inductor component and the second main path connection switch SW2 is connected between the first capacitor and the second capacitor. When the second main path connection switch SW2 is turned on, the second branch formed by the intermediate-frequency adjustment inductor component is grounded, so that the antenna can operate in the first intermediate-frequency band, that is, the B1 band. As an optional embodiment, the second switch component further includes a second grounding switch for grounding, and the intermediate-frequency adjustment inductor component includes: a first intermediate-frequency adjustment inductor connected to the first capacitor and the second capacitor and a second intermediate-frequency adjustment inductor connected to the grounding end; the second grounding switch is connected between the first intermediate-frequency adjustment inductor and the second intermediate-frequency adjustment inductor, for making the antenna operate in the second intermediate-frequency band when the second main path connection switch and the second grounding switch are closed.
[0059] That is to say, the second switch component simultaneously includes a second grounding switch SW4 and a second main path connection switch SW2, and the second grounding switch SW4 is arranged between the first intermediate-frequency adjustment inductor L3 and the second intermediate-frequency adjustment inductor L4, so that when the second main path connection switch SW2 and the second grounding switch SW4 are closed, only the first intermediate-frequency adjustment inductor L3 is included in the second branch, and thus the antenna can operate in the second intermediate-frequency band.
[0060] Through the method of this embodiment, only by switching the second grounding switch SW4, the adjustment of making the antenna operate between the first intermediate-frequency band and the second intermediate-frequency band can be achieved.
[0061] As an optional embodiment, the first intermediate-frequency tuning inductor has a size between 3.5 nH and 4.5 nH, and the second intermediate-frequency tuning inductor has a size between 9.5 nH and 10.5 nH. Further, the first intermediate-frequency tuning inductor has a size of 4 nH, and the second intermediate-frequency tuning inductor has a size of 10 nH. Thus, when SW2 and SW4 are closed, L3 is connected in parallel with the antenna, enabling the antenna to operate in the B3 band. When SW2 is closed, L3 + L4 is connected in parallel with the antenna, enabling the antenna to operate in the B1 band. Since the B3 band can cover 80%-90% of the standing wave in the B41 band, and the B1 band can cover 80%-90% of the standing wave in the B41 band, as the second switching component is switched, the waveform of the B41 band will also fluctuate, and a better bandwidth for the B41 band can be achieved.
[0062] Figure 3A For the switching topology schematic diagram of the old antenna system using a 4-pole switch in the related art as shown in Figure 1 the schematic diagram of the standing wave (solid line) and efficiency (dashed line), where S1,1-1 to S1,1-5 are the standing wave schematic curves, and Tot.[1] to Tot.[5] are the efficiency schematic curves. Figure 3B For the switching topology schematic diagram of the new antenna system using a 2-pole switch as shown in Figure 2 the schematic diagram of the standing wave (solid line) and efficiency (dashed line), where S1,1-1 to S1,1-4 are the standing wave schematic curves, and Tot.[1] to Tot.[4] are the efficiency schematic curves. The efficiency of the antenna system refers to the ability of the antenna to convert the input power into effective radiated power, that is, the ratio of the antenna radiated power to the input power. A high efficiency means less power loss inside the antenna. In this embodiment, the efficiency can be the result of taking the logarithm of the above ratio, and the larger the value, the higher the efficiency indicates. From Figure 3A and Figure 3B the following antenna efficiency table can be obtained:
[0063]
[0064] From the above table, it can be seen that whether it is the average efficiency or the peak efficiency, the new switching circuit of the antenna as shown in Figure 2 has a significant improvement compared to the old switching circuit of the antenna in the related art as shown in Figure 1 .
[0065] According to another aspect of the embodiments of the present disclosure, an antenna component antenna system is proposed, including an antenna and the switching circuit as described in any of the foregoing embodiments, and the feeding point of the antenna is connected with the peripheral matching circuit. Further, the antenna is a medium-high frequency antenna and is an inverted F antenna.
[0066] According to another aspect of the embodiments of the present disclosure, a networking device is provided, including the antenna component antenna system as described in any of the foregoing embodiments. In this embodiment, the networking device may include, but is not limited to, devices capable of communication such as mobile phones, tablet computers, computers, wearable devices, sensors, Internet of Things devices, etc.
[0067] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present disclosure and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present disclosure. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first", "second", etc. may explicitly or implicitly include at least one of such features. In the description of the present disclosure, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.
[0068] In the present disclosure, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal connection or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood according to specific circumstances.
[0069] In the present disclosure, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.
[0070] It should be noted that when an element is referred to as being "fixed to", "arranged on", "secured to" or "mounted on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time.
[0071] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.
[0072] The above embodiments only represent several implementation manners of the present disclosure. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present disclosure, several modifications and improvements can be made, and these all belong to the protection scope of the present disclosure.
Claims
1. A switching circuit for an antenna, characterized in that: include: Two-pole switch, peripheral matching circuit for connecting to the feed point of the antenna, high-frequency FM matching component and intermediate-frequency FM matching component; The high-frequency frequency modulation matching component is connected to the peripheral matching circuit through the first switch component in the two-pole switch, and is used to make the antenna work in the high-frequency band when the first switch component is closed; The intermediate frequency frequency modulation matching component is connected to the peripheral matching circuit through the second switch component in the two-pole switch, and is used to make the antenna work in the intermediate frequency band when the second switch component is closed.
2. The switching circuit of the antenna according to claim 1, characterized in that: The peripheral matching circuit includes a first capacitor, a second capacitor, a third capacitor, a first inductor and a second inductor; The first capacitor, the second capacitor, and the second inductor are connected in series, and an end of the first capacitor not connected to the second capacitor is connected to the feeding point, and an end of the second inductor not connected to the second capacitor is used to be connected to a signal source; One end of the first inductor is grounded, and the other end is connected to the first capacitor and the second capacitor. One end of the third capacitor is grounded, and the other end is connected to the signal source.
3. The switching circuit of the antenna according to claim 2, characterized in that: The high-frequency frequency modulation matching component includes a high-frequency adjustment capacitor, and the first switch component includes a first main circuit connection switch; The high-frequency regulating capacitor and the first main connection switch are connected in series to form a first branch, and the first branch is connected in parallel with the second capacitor.
4. The switching circuit of the antenna according to claim 3, characterized in that: The first switch assembly further includes a first grounding switch for grounding; The first grounding switch is located in the first branch at an end close to the signal source, the high-frequency adjustment capacitor is located in the first branch at an end away from the signal source, and the first grounding switch is connected to the first main connection switch.
5. The switching circuit of the antenna according to claim 3, characterized in that: The size of the high-frequency adjustment capacitor is between 1 pF and 2 pF.
6. The switching circuit of the antenna according to claim 2, characterized in that: The intermediate frequency frequency modulation matching component includes an intermediate frequency adjustment inductor component, and the second switch component includes a second main circuit connection switch; The intermediate frequency adjustment inductor component and the second main circuit connection switch are connected in series to form a second branch, and one end of the second branch is grounded, and the other end is connected to the first capacitor and the second capacitor, so as to enable the antenna to operate in the first intermediate frequency band when the second main circuit connection switch is closed.
7. The switching circuit of the antenna according to claim 6, characterized in that: The second switch component further includes a second grounding switch for grounding, and the intermediate frequency adjustment inductor component includes: a first intermediate frequency adjustment inductor connected to the first capacitor and the second capacitor, and a second intermediate frequency adjustment inductor connected to the ground terminal; The second grounding switch is connected between the first intermediate frequency adjustment inductor and the second intermediate frequency adjustment inductor, and is used to enable the antenna to operate in the second intermediate frequency band when the second main connection switch and the second grounding switch are closed.
8. The switching circuit of the antenna according to claim 7, characterized in that: The first intermediate frequency adjustment inductor has a value between 3.5nH and 4.5nH, and the second intermediate frequency adjustment inductor has a value between 9.5nH and 10.5nH.
9. An antenna system, characterized in that: The invention comprises an antenna and the switching circuit according to any one of claims 1 to 8, wherein the feeding point of the antenna is connected to the peripheral matching circuit.
10. A networked device, characterized in that: Comprising the antenna system as claimed in claim 9.