Multi-frequency communication system and network device

Abstract

The application discloses a multi-frequency communication system and network equipment, and belongs to the technical field of wireless communication. The multi-frequency communication system comprises at least two radio frequency circuit modules and at least two radiation antennas; the working frequency bands of the at least two radio frequency circuit modules are different; each radio frequency circuit module comprises, in sequence and electrically connected, a radio frequency transceiver chip, an impedance matching network, a first filter, a switching device and a second filter, and the second filter is electrically connected with one of the radiation antennas; the first filter and the second filter are used for suppressing interference signals of the other radio frequency circuit module. The multi-frequency communication system of the application is not only beneficial to reducing the overall size of the multi-frequency communication system, but also can effectively reduce the volume and cost of the radio frequency circuit module.

Description

Technical Field

[0001] This application relates to the field of wireless communication technology, and in particular to a multi-frequency communication system and network device. Background Technology

[0002] A wireless router is a router used for users to access the Internet and has wireless coverage capabilities. It can be regarded as a repeater, forwarding broadband network signals through an antenna to nearby wireless network devices (such as laptops, mobile phones and tablets with WIFI capabilities, and all devices with WIFI capabilities).

[0003] Wireless routers in related technologies typically support multiple frequency bands. To ensure that multiple bands can work simultaneously, interference between two or more frequency bands should be minimized. This is achieved by increasing the antenna spacing and using bandpass filtering to improve isolation and suppress interference.

[0004] However, increasing antenna spacing and bandpass filtering will increase the size and cost of wireless routers, which is not conducive to the miniaturization and low-cost development of wireless routers. Utility Model Content

[0005] This application provides a multi-frequency communication system and network device that can solve the problems existing in related technologies.

[0006] The technical solution is as follows:

[0007] On the one hand, a multi-frequency communication system is provided, the multi-frequency communication system comprising: at least two radio frequency circuit modules and at least two radiating antennas;

[0008] The at least two radio frequency circuit modules operate in different frequency bands;

[0009] Each of the radio frequency circuit modules includes a radio frequency transceiver chip, an impedance matching network, a first filter, a switching device, and a second filter that are electrically connected in sequence, and the second filter is electrically connected to one of the radiating antennas.

[0010] The first filter and the second filter are respectively used to suppress interference signals from the other radio frequency circuit module.

[0011] In this embodiment of the multi-frequency communication system, two filters are arranged in each radio frequency circuit module, and the two filters are respectively arranged on the front and rear sides of the switching device. This not only effectively filters out interference signals from adjacent radio frequency circuit modules, but also eliminates the need to increase the spacing between multiple radio frequency circuit modules to improve isolation. This helps to reduce the overall size of the multi-frequency communication system and facilitates the miniaturization of network devices such as wireless routers. Furthermore, neither filter needs to use filtering elements with particularly high suppression capabilities, which can further effectively reduce the size and cost of the radio frequency circuit modules and improve the economic efficiency of network devices such as wireless routers.

[0012] In some possible implementations, the suppression ratio Rs2 of the second filter is greater than the suppression ratio Rs1 of the first filter.

[0013] With the above arrangement, the second filter is located between the switching device and the radiating antenna. Therefore, the second filter needs to have a higher suppression capability, while the first filter is a secondary filter based on the second filter, so it only needs a lower suppression capability. The suppression capability is directly proportional to the suppression ratio, that is, the higher the suppression ratio, the higher the suppression capability, and the higher the specifications and cost of the corresponding filter. Therefore, using a first filter with a lower suppression capability can not only improve antenna isolation, but also help reduce product size and product cost.

[0014] In some possible implementations, the suppression ratio Rs1 of the first filter is less than or equal to 20dB, thus the first filter has a low suppression capability and can effectively suppress conventional interference. Such filters are relatively small in cost and size, which is conducive to realizing low-cost and miniaturized design of multi-frequency communication systems.

[0015] In some possible implementations, the radio frequency transceiver chip is provided with a first RX port, and the switching device is provided with a second RX port;

[0016] The first RX port is connected to the second RX port in sequence through an impedance matching network, and the first filter is arranged in series between the impedance matching network and the second RX port.

[0017] With the above arrangement, the first filter is connected in series on the receiving link of the RF transceiver chip. The first filter is used to filter out interference from the RF signal after the gain of the switching device. This RF signal has a higher strength than the original signal, so the attenuation effect of the RF signal caused by the insertion loss of the first filter can be reduced as much as possible. Thus, after the RF signal is attenuated by the first filter, it can still be input to the RF transceiver chip with high fidelity, ensuring that the RF circuit module has high communication quality.

[0018] In some possible implementations, the radio frequency transceiver chip is further provided with a first TX port, and the switching device is further provided with a second TX port and an antenna port;

[0019] The first TX port is connected to the second TX port through another impedance matching network, and the antenna port is connected to one of the radiating antennas;

[0020] The second filter is arranged in series between the antenna port and the radiating antenna.

[0021] With the above arrangement, the RF transceiver chip can transmit RF signals outward using the first TX port, impedance matching network, second TX port, and antenna port. After being filtered and optimized by the second filter, the RF signal is radiated outward through the radiating antenna. The RF transceiver chip can receive the RF signal input from the radiating antenna using the first RX port, impedance matching network, first filter, second RX port, and antenna port. After the RF signal is filtered by the second filter to remove interference signals, it is first amplified and gain processed by a switching device, then filtered by the first filter to remove interference signals, and finally input to the RF transceiver chip.

[0022] In some possible implementations, the RF transceiver chip is provided with multiple first RX ports and multiple first TX ports, and the impedance matching network, the switching device, the first filter and the second filter are each multiple;

[0023] Wherein, one of the first RX ports and one of the first TX ports are respectively connected to the second RX port and the second TX port on the same switching device;

[0024] Each of the first RX ports and the corresponding second RX ports is provided with a first filter.

[0025] With the above arrangement, the RF transceiver chip can use multiple first RX ports and multiple first TX ports to form multiple different transmit signal streams and receive signal streams. This allows network devices such as wireless routers to split the data to be transmitted into multiple "sub-data streams" (spatial streams), which are then fed to different radiating antennas through different first TX ports and transmitted to the terminal device simultaneously along slightly different paths. Alternatively, different "sub-data streams" can be received through different radiating antennas, and the RF chip can restore and merge them into complete data, thus achieving spatial multiplexing. This means using multiple independent "spatial streams" to transmit data in parallel, thereby increasing the overall data rate.

[0026] In some possible implementations, the number of radio frequency circuit modules is two, and the number of radiating antennas is eight;

[0027] Each of the radio frequency circuit modules is connected to one of the four radiating antennas.

[0028] With the above arrangement, the multi-frequency communication system supports simultaneous operation of dual frequency bands, and can achieve a transmission rate of up to 19Gbps ​​using eight radiating antennas.

[0029] In some possible implementations, the switching device includes one of a radio frequency front-end module and an antenna switch. Thus, the switching device can control the second TX port and the antenna port to be turned on in transmit mode, and control the second RX port and the antenna port to be turned on in receive mode.

[0030] In some possible implementations, the impedance matching network includes at least one of an inductive element and a capacitive element.

[0031] On the other hand, a network device is provided, which includes the multi-frequency communication system described in this application.

[0032] The network device in this embodiment adopts the multi-frequency communication system of this application and has all the beneficial technical effects of this application.

[0033] In some possible implementations, the network device is a wireless router. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the structure of the multi-frequency communication system provided in the embodiments of this application;

[0036] Figure 2 This is a schematic diagram of the structure of the radio frequency circuit module provided in the embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the structure of a multi-frequency communication system provided in another embodiment of this application.

[0038] The reference numerals in the figure are respectively:

[0039] 1. Radio frequency circuit module;

[0040] 11. Radio frequency transceiver chip; 11a. First RX port; 11b. First TX port;

[0041] 12. Impedance matching network;

[0042] 13. First filter;

[0043] 14. Switching device; 14a. Second RX port; 14b. Second TX port; 14c. Antenna port;

[0044] 15. Second filter;

[0045] 2. Radiation antenna. Detailed Implementation

[0046] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0047] In the description of this application, 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., indicating orientation or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0048] Unless otherwise defined, all technical terms used in the embodiments of this application have the same meaning as commonly understood by one of ordinary skill in the art.

[0049] In related technologies, tri-band wireless routers typically increase the isolation between 5150MHz-5330MHz and 5735MHz-5835MHz, or between 5170-5835MHz and 5945-7125MHz, by adding a bandpass filter with a high degree of suppression for interference frequency bands (usually around 52dB of interference signal suppression) to the main RF path. At the same time, they try to increase the physical distance between the working antenna and the interfering antenna to increase the antenna isolation (approximately 22-25dB).

[0050] For a high-power wireless router with four antennas, assuming an interference signal power of 24dBm, the combined antenna isolation and filter suppression of interference signals need to reach 82dB. To achieve this, increasing the suppression of interference signals by the filter on the main RF path would require either a bulky dielectric filter or a very expensive LTCC filter, which is detrimental to product miniaturization and cost control.

[0051] Increasing the distance between the working antenna and the interfering antenna to increase the isolation of the entire link would result in a larger antenna size, reaching 35cm*35cm.

[0052] Therefore, this application provides a multi-frequency communication system and network device. The multi-frequency communication system arranges two filters in each radio frequency circuit module, and the two filters are respectively arranged on the front and rear sides of the switching device. This can not only effectively filter out the interference signal of the adjacent radio frequency circuit module, but also eliminate the need to increase the spacing between multiple radio frequency circuit modules to improve isolation. This is beneficial to reducing the overall size of the multi-frequency communication system and to miniaturizing network devices such as wireless routers. Moreover, neither filter needs to use filtering elements with particularly high suppression capabilities, which can further effectively reduce the size and cost of the radio frequency circuit module and improve the economic efficiency of network devices such as wireless routers.

[0053] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0054] On the one hand, combined with Figure 1 As shown, this embodiment provides a multi-frequency communication system, which includes at least two radio frequency circuit modules 1 and at least two radiating antennas 2.

[0055] At least two RF circuit modules 1 operate in different frequency bands.

[0056] Each RF circuit module 1 includes an RF transceiver chip 11, an impedance matching network 12, a first filter 13, a switching device 14, and a second filter 15, which are connected in sequence. The second filter 15 is electrically connected to one of the radiating antennas 2. The first filter 13 and the second filter 15 are used to suppress interference signals from the other RF circuit module 1.

[0057] In this embodiment of the multi-frequency communication system, two filters are arranged in each radio frequency circuit module 1, and the two filters are respectively arranged on the front and rear sides of the switching device 14. This not only effectively filters out the interference signal of the adjacent radio frequency circuit module 1, but also eliminates the need to increase the spacing between multiple radio frequency circuit modules 1 to improve isolation. This helps to reduce the overall size of the multi-frequency communication system and facilitates the miniaturization of network devices such as wireless routers. Furthermore, neither filter needs to use filtering elements with particularly high suppression capabilities, which can further effectively reduce the size and cost of the radio frequency circuit module 1 and improve the economic efficiency of network devices such as wireless routers.

[0058] In some possible implementations, the radio frequency transceiver chip 11 is the "central core" for implementing the wireless signal transmission and reception (Rx) function. The radio frequency transceiver chip 11 can perform bidirectional conversion between "baseband digital signals" and "radio frequency analog signals." When transmitting signals: the radio frequency transceiver chip 11 receives digital baseband signals (such as IQ signals) from the baseband chip, converts them into high-frequency radio frequency signals through modulation and up-conversion, and then outputs them to the radiating antenna 2 after power amplification; when receiving signals: it receives weak radio frequency signals from the radiating antenna 2, converts them into baseband digital signals through low-noise amplification, down-conversion, and demodulation, and then transmits them to the baseband chip for subsequent processing (such as demodulation and decoding).

[0059] In some possible implementations, the impedance matching network 12 functions by adjusting the circuit impedance through specific components so that the output / input impedance of the RF transceiver chip 11 is consistent with the input / output impedance of the RF front-end module (e.g., 50Ω), thereby achieving maximum power transfer, minimum signal reflection, and optimal link efficiency.

[0060] In some possible implementations, the suppression ratio Rs2 of the second filter 15 is greater than the suppression ratio Rs1 of the first filter 13.

[0061] With the above arrangement, the second filter 15 is located between the switching device 14 and the radiating antenna 2. Therefore, the second filter 15 needs to have a higher suppression capability. The first filter 13, on the other hand, performs secondary filtering based on the second filter 15, and therefore only needs a lower suppression capability. The suppression capability is directly proportional to the suppression ratio; that is, the higher the suppression ratio, the higher the suppression capability, and the higher the specifications and cost of the corresponding filter. Therefore, using the first filter 13 with a lower suppression capability can not only improve antenna isolation but also help reduce product size and cost.

[0062] In some possible implementations, the "suppression ratio" (unit: dB) of the filter for the interference band is essentially a measure of the degree to which the interference signal is "attenuated" after passing through the filter. Its value directly corresponds to the attenuation level of the interference signal power - the larger the value, the more thoroughly the interference is suppressed.

[0063] The suppression ratio is defined as: the power of the interference signal before the filter is input ÷ the power of the interference signal after the filter is output, then take the logarithm to the base 10 and multiply by 10.

[0064] In some possible implementations, the suppression ratio Rs1 of the first filter 13 is less than or equal to 20dB, thus the first filter 13 has a low suppression capability and can effectively suppress conventional interference. The cost and size of such filters are relatively small, which is conducive to realizing low-cost and miniaturized design of multi-frequency communication systems.

[0065] In some possible implementations, the suppression ratio Rs1 of the first filter 13 may take values ​​such as 3dB, 6dB, 8dB, 10dB, 12dB, 14dB, 16dB, 18dB, 20dB, etc.

[0066] Combination Figure 2 As shown, in some possible implementations, the radio frequency transceiver chip 11 is provided with a first RX port 11a, and the switching device 14 is provided with a second RX port 14a.

[0067] The first RX port 11a is connected to the second RX port 14a in sequence through an impedance matching network 12, and the first filter 13 is arranged in series between the impedance matching network 12 and the second RX port 14a.

[0068] With the above arrangement, the first filter 13 is connected in series on the receiving link of the RF transceiver chip 11. The first filter 13 is used to filter out interference from the RF signal after the gain of the switching device 14. This RF signal has a higher strength than the original signal, so the attenuation effect on the RF signal caused by the insertion loss of the first filter 13 can be reduced as much as possible. Thus, after the RF signal is attenuated by the first filter 13, it can still be input to the RF transceiver chip 11 with high fidelity, ensuring that the RF circuit module 1 has high communication quality.

[0069] Combination Figure 2 As shown, in some possible implementations, the RF transceiver chip 11 is further provided with a first TX port 11b, and the switching device 14 is further provided with a second TX port 14b and an antenna port 14c.

[0070] The first TX port 11b is connected to the second TX port 14b through another impedance matching network 12, and the antenna port 14c is connected to a radiating antenna 2; the second filter 15 is arranged in series between the antenna port 14c and the radiating antenna 2.

[0071] With the above arrangement, the RF transceiver chip 11 can transmit RF signals outward using the first TX port 11b, impedance matching network 12, second TX port 14b, and antenna port 14c. After the RF signal is filtered and optimized by the second filter 15, it is radiated outward through the radiating antenna 2. The RF transceiver chip 11 can receive the RF signal input from the radiating antenna 2 using the first RX port 11a, impedance matching network 12, first filter 13, second RX port 14a, and antenna port 14c. After the RF signal is filtered by the second filter 15 to remove interference signals, it is first amplified and gain processed by the switching device 14, and then filtered by the first filter 13 to remove interference signals before being input to the RF transceiver chip 11.

[0072] The switching device 14 can control the second TX port 14b and the antenna port 14c to be turned on in the transmit mode, and control the second RX port 14a and the antenna port 14c to be turned on in the receive mode.

[0073] Combination Figure 3 As shown, in some possible implementations, the RF transceiver chip 11 is provided with multiple first RX ports 11a and multiple first TX ports 11b, and the number of impedance matching network 12, switching device 14, first filter 13 and second filter 15 are multiple.

[0074] Among them, a first RX port 11a and a first TX port 11b are respectively connected to the second RX port 14a and the second TX port 14b on the same switching device 14; a first filter 13 is provided between each first RX port 11a and the corresponding second RX port 14a.

[0075] With the above arrangement, the RF transceiver chip 11 can use multiple first RX ports 11a and multiple first TX ports 11b to form multiple different transmit signal streams and receive signal streams. This allows network devices such as wireless routers to split the data to be transmitted into multiple "sub-data streams" (spatial streams), which are then fed to different radiating antennas 2 through different first TX ports 11b and transmitted to the terminal device simultaneously through slightly different paths. Alternatively, different "sub-data streams" can be received through different radiating antennas 2, and then the RF chip can restore and merge them into complete data, thus realizing spatial multiplexing. In other words, multiple independent "spatial streams" are used to transmit data in parallel, thereby increasing the overall data rate.

[0076] In some possible implementations, the radio frequency circuit module 1 of this embodiment can achieve beamforming by combining multiple first RX ports 11a and first TX ports 11b with multiple radiating antennas 2. That is, by dynamically adjusting the signal phase and amplitude of each antenna, the wireless signal is focused into a "directional beam" pointing towards the terminal device, rather than the "broadcast" radiation of a traditional omnidirectional antenna.

[0077] Combination Figure 3 As shown, in some possible implementation schemes, there are two radio frequency circuit modules 1 and eight radiating antennas 2; each radio frequency circuit module 1 is connected to four radiating antennas 2 respectively.

[0078] With the above arrangement, the multi-frequency communication system supports simultaneous operation of dual frequency bands, and can achieve a transmission rate of up to 19Gbps ​​using eight radiating antennas 2.

[0079] In some possible implementations, the switching device 14 includes one of an RF front-end module and an antenna switch. Thus, the switching device 14 can control the second TX port 14b and the antenna port 14c to be turned on in transmit mode, and control the second RX port 14a and the antenna port 14c to be turned on in receive mode.

[0080] For example, the RF front-end module includes an amplifier, a low-noise amplifier, and an RF switch / antenna switch. In transmit mode, the RF front-end module can amplify the weak RF signal output by the RF transceiver chip 11 to a sufficient transmit power, filter out noise, and radiate it outward through the radiating antenna 2. In receive mode, the weak RF signal captured by the antenna is amplified with low noise, out-of-band interference is filtered out, and then transmitted to the RF transceiver chip 11 for demodulation.

[0081] For example, an antenna switch can dynamically switch radio frequency signal paths, enabling switching between multiple frequency bands, multiple antennas, or transmit / receive modes. The antenna switch can be a single-pole multi-throw (SPnT), a double-pole multi-throw (DPnT), a crossbar switch, etc.

[0082] In some possible implementations, the impedance matching network 12 includes at least one of an inductive element, a capacitive element, and a resistive element. The inductive element can change the inductive reactance of the circuit through its magnetic field energy storage characteristics, used to compensate for capacitive impedance or adjust the imaginary part of the impedance. The capacitive element can change the capacitive reactance of the circuit through its electric field energy storage characteristics, used to compensate for inductive impedance or adjust the imaginary part of the impedance. The resistive element can be used in some scenarios to adjust the real part of the impedance (e.g., when the matching network needs to absorb some reflected signals to stabilize the circuit).

[0083] On the other hand, this embodiment provides a network device, which includes the multi-frequency communication system of this application. The network device of this embodiment adopts the multi-frequency communication system of this application and has all the beneficial technical effects of this application.

[0084] In some possible implementations, the network device is a wireless router. A wireless router is the network hub connecting wired networks and wireless devices. Essentially, it uses radio frequency technology to convert wired signals (such as fiber optic cables or network cables) provided by broadband operators into Wi-Fi wireless signals, enabling wireless interconnection of multiple devices such as mobile phones, computers, and smart home devices. For example, a wireless router can achieve coverage at 2.4GHz, 5GHz, and 6GHz, and can support protocol versions such as Wi-Fi 5, Wi-Fi 6, Wi-Fi 6E, and Wi-Fi 7.

[0085] It should be noted that in this article, "several" and "at least one" refer to one or more, while "multiple" and "at least two" refer to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0086] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0087] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this application.

[0088] The above description is merely an embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A multi-frequency communication system, characterized in that, The multi-frequency communication system includes: at least two radio frequency circuit modules (1) and at least two radiating antennas (2); The at least two radio frequency circuit modules (1) operate in different frequency bands; Each of the radio frequency circuit modules (1) includes a radio frequency transceiver chip (11), an impedance matching network (12), a first filter (13), a switching device (14), and a second filter (15) that are electrically connected in sequence, and the second filter (15) is electrically connected to one of the radiating antennas (2). The first filter (13) and the second filter (15) are respectively used to suppress interference signals from another radio frequency circuit module (1).

2. The multiple frequency communication system of claim 1, wherein, The suppression ratio Rs2 of the second filter (15) is greater than the suppression ratio Rs1 of the first filter (13).

3. The multiple frequency communication system of claim 1, wherein, The suppression ratio Rs1 of the first filter (13) is less than or equal to 20dB.

4. The multi-frequency communication system of any one of claims 1 to 3, wherein, The radio frequency transceiver chip (11) is provided with a first RX port (11a), and the switching device (14) is provided with a second RX port (14a); The first RX port (11a) is connected to the second RX port (14a) in sequence through an impedance matching network (12), and the first filter (13) is arranged in series between the impedance matching network (12) and the second RX port (14a).

5. The multiple frequency communication system of claim 4, wherein, The radio frequency transceiver chip (11) is also provided with a first TX port (11b), and the switching device (14) is also provided with a second TX port (14b) and an antenna port (14c); The first TX port (11b) is connected to the second TX port (14b) through another impedance matching network (12), and the antenna port (14c) is connected to one of the radiating antennas (2); The second filter (15) is arranged in series between the antenna port (14c) and the radiating antenna (2).

6. The multiple frequency communication system of claim 5, wherein, The radio frequency transceiver chip (11) is provided with multiple first RX ports (11a) and multiple first TX ports (11b), and the impedance matching network (12), the switching device (14), the first filter (13) and the second filter (15) are in multiple quantities; Among them, one of the first RX ports (11a) and one of the first TX ports (11b) are respectively connected to the second RX port (14a) and the second TX port (14b) on the same switching device (14); Each of the first RX ports (11a) and the corresponding second RX ports (14a) is provided with a first filter (13).

7. The multiple frequency communication system of claim 6, wherein The number of radio frequency circuit modules (1) is two, and the number of radiating antennas (2) is eight; Each of the radio frequency circuit modules (1) is connected to one of the four radiating antennas (2).

8. The multi-frequency communication system of any one of claims 1 to 3, wherein, The switching device (14) includes one of a radio frequency front-end module and an antenna switch.

9. The multi-frequency communication system of any one of claims 1 to 3, wherein, The impedance matching network (12) includes at least one of an inductor and a capacitor.

10. A network device, comprising: The network device includes the multi-frequency communication system according to any one of claims 1 to 9.

11. The network device of claim 10, wherein, The network device is a wireless router.

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