CN110581718A - Radio frequency isolation circuit and dual-frequency network equipment - Google Patents
Radio frequency isolation circuit and dual-frequency network equipment Download PDFInfo
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- CN110581718A CN110581718A CN201910821007.2A CN201910821007A CN110581718A CN 110581718 A CN110581718 A CN 110581718A CN 201910821007 A CN201910821007 A CN 201910821007A CN 110581718 A CN110581718 A CN 110581718A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/401—Circuits for selecting or indicating operating mode
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/50—Circuits using different frequencies for the two directions of communication
- H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
- H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
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Abstract
The invention discloses a radio frequency isolation circuit and dual-frequency network equipment, wherein the circuit comprises a control module, a first filtering module, a first switch module, a second filtering module, a third switch module and a fourth switch module; the control module is used for generating a first control signal and a second control signal; the first filtering module is connected between the first switch module and the second switch module and comprises M low-pass filters which are connected in parallel and have different cut-off frequencies; the first switch module and the second switch module are used for enabling the first control signal to gate one low-pass filter in the first filtering module; the second filtering module is connected between the third switching module and the fourth switching module and comprises N high-pass filters which are connected in parallel and have different cut-off frequencies; the third and fourth switching modules are used for gating one high-pass filter in the second filtering module according to the second control signal. The invention can reduce the in-band insertion loss of the radio frequency link and improve the interference suppression capability.
Description
Technical Field
the invention relates to the technical field of wireless communication, in particular to a radio frequency isolation circuit and dual-frequency network equipment.
Background
With the opening of a 6-7 GHz frequency band (hereinafter referred to as a 6GHz frequency band), more and more network products can be designed to support the 6GHz frequency band to work, because the isolation bandwidth between the 6GHz frequency band and the existing 5-6 GHz frequency band (hereinafter referred to as a 5GHz frequency band) is relatively narrow (about 100MHz), if the 5GHz frequency band and the 6GHz frequency band to work on the network equipment are required, considering that the volume of the network equipment is generally small, the isolation between antennas cannot be too high, and the network equipment can have great mutual interference when working at the 5GHz frequency band and the 6GHz frequency band simultaneously.
Aiming at the problems, a general design adopts a large-attenuation isolation filter, but the frequency band interval between a 5GHz frequency band and a 6GHz frequency band is too narrow, and the existing 5GHz and 6GHz isolation filter has two problems, namely, the insertion loss in a 5GHz high-frequency band is too large, and the attenuation of an out-of-band 6GHz low frequency band is too small, so that the isolation requirement is not met, and the interference suppression capability is poor.
Disclosure of Invention
The technical problem to be solved by the embodiments of the present invention is to provide a radio frequency isolation circuit and a dual-band network device, which can reduce the in-band insertion loss of a radio frequency link and improve the interference suppression capability.
In order to solve the above technical problem, an embodiment of the present invention provides a radio frequency isolation circuit, where the circuit is suitable for a dual-frequency network device; the circuit comprises a control module, a first filtering module, a first switch module, a second filtering module, a third switch module and a fourth switch module;
The control module is used for generating a first control signal and a second control signal;
The first filtering module is connected between the first switch module and the second switch module and comprises M low-pass filters which are connected in parallel and have different cut-off frequencies; wherein M is more than or equal to 2;
the first switch module and the second switch module are respectively connected with the control module and used for gating one low-pass filter in the first filtering module according to the first control signal so as to filter signals transmitted or/and received by the first radio frequency transceiving module of the dual-frequency network device through the gated low-pass filter;
The second filtering module is connected between the third switching module and the fourth switching module and comprises N high-pass filters which are connected in parallel and have different cut-off frequencies; wherein N is more than or equal to 2;
the third switch module and the fourth switch module are respectively connected with the control module and used for gating one high-pass filter in the second filtering module according to the second control signal so as to filter signals transmitted or/and received by the second radio frequency transceiving module of the dual-frequency network device through the gated high-pass filter.
Further, the first switch module comprises a first radio frequency switch; the input end of the first radio frequency switch is connected with the first control signal output end of the control module, and the output ends of the first radio frequency switches are correspondingly connected with the first ends of the M low-pass filters one by one;
the second switch module comprises a second radio frequency switch; the input end of the second radio frequency switch is connected with the first control signal output end of the control module, and the output ends of the second radio frequency switch are correspondingly connected with the second ends of the M low-pass filters one by one;
the third switching module comprises a third radio frequency switch; the input end of the third radio frequency switch is connected with the second control signal output end of the control module, and the output ends of the third radio frequency switch are correspondingly connected with the first ends of the N high-pass filters one by one;
The fourth switch module comprises a fourth radio frequency switch; the input end of the fourth radio frequency switch is connected with the second control signal output end of the control module, and the output end of the fourth radio frequency switch is connected with the second ends of the N high-pass filters in a one-to-one correspondence mode.
further, the first radio frequency transceiver module of the dual-frequency network device comprises a 5GHz radio frequency transceiver, and the second radio frequency transceiver module of the dual-frequency network device comprises a 6GHz radio frequency transceiver; the control module is specifically configured to:
generating a first control signal according to a first working frequency band of the 5GHz radio frequency transceiver;
And generating a second control signal according to a second working frequency band of the 6GHz radio frequency transceiver.
further, the first operating frequency band comprises a first sub-frequency band and a second sub-frequency band; the first filtering module comprises a first low-pass filter and a second low-pass filter; the control module is specifically configured to:
when the 5GHz radio frequency transceiver works in the first sub-frequency band, generating a first control signal for gating the first low-pass filter;
and when the 5GHz radio frequency transceiver works in the second sub-frequency band, generating a first control signal for gating the second low-pass filter.
further, the frequency range of the first operating frequency band is 5.17 GHz-5.835 GHz; the frequency range of the first sub-band is 5.17 GHz-5.65 GHz, and the frequency range of the second sub-band is 5.65 GHz-5.835 GHz.
Further, the cut-off frequency of the first low-pass filter is 5.85GHz, and the cut-off frequency of the second low-pass filter is 6.2 GHz.
further, the second operating frequency band includes a third frequency sub-band and a fourth frequency sub-band; the second filtering module comprises a first high-pass filter and a second high-pass filter; the control module is specifically configured to:
When the 6GHz radio frequency transceiver works in the third sub-frequency band, generating a second control signal for gating the first high-pass filter;
And when the 6GHz radio frequency transceiver works in the fourth sub-frequency band, generating a second control signal for gating the second high-pass filter.
Further, the frequency range of the second working frequency band is 6.005 GHz-7.105 GHz; the frequency range of the third sub-band is 6.005 GHz-6.425 GHz, and the frequency range of the fourth sub-band is 6.425 GHz-7.105 GHz.
further, the cut-off frequency of the first high-pass filter is 5.85GHz, and the cut-off frequency of the second high-pass filter is 6.2 GHz.
In order to solve the above technical problem, an embodiment of the present invention further provides a dual-frequency network device, where the dual-frequency network device includes a first radio frequency transceiver module, a second radio frequency transceiver module, a first antenna, a second antenna, and any one of the radio frequency isolation circuits;
the first radio frequency transceiver module is connected with a first switch module of the radio frequency isolation circuit, and the first antenna is connected with a second switch module of the radio frequency isolation circuit;
the second radio frequency transceiver module is connected with a third switch module of the radio frequency isolation circuit, and the second antenna is connected with a fourth switch module of the radio frequency isolation circuit;
the first radio frequency transceiver module transmits or/and receives signals through the first antenna;
And the second radio frequency transceiver module transmits or/and receives signals through the second antenna.
compared with the prior art, the embodiment of the invention provides a radio frequency isolation circuit and a dual-frequency network device, wherein a control module generates a first control signal and a second control signal, a first switch module and a second switch module gate a low-pass filter in a first filtering module according to the first control signal, the gated low-pass filter filters a signal transmitted or/and received by the first radio frequency transceiving module of the dual-frequency network device so as to prevent the signal of the first radio frequency transceiving module from interfering with a second radio frequency transceiving module, a third switch module and a fourth switch module gate a high-pass filter in the second filtering module according to the second control signal, and the gated high-pass filter filters a signal transmitted or/and received by the second radio frequency transceiving module of the dual-frequency network device, the signal of the second radio frequency transceiver module is prevented from interfering the first radio frequency transceiver module, so that the in-band insertion loss of a radio frequency link can be reduced, and the interference suppression capability is improved.
Drawings
fig. 1 is a schematic structural diagram of a preferred embodiment of a radio frequency isolation circuit provided in the present invention;
fig. 2 is a schematic structural diagram of another preferred embodiment of a radio frequency isolation circuit provided in the present invention;
fig. 3 is a schematic structural diagram of a preferred embodiment of a dual-band network device provided in the present invention.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without any inventive step, are within the scope of the present invention.
An embodiment of the present invention provides a radio frequency isolation circuit, which is shown in fig. 1 and is a schematic structural diagram of a preferred embodiment of the radio frequency isolation circuit provided in the present invention, and the circuit is suitable for a dual-frequency network device; the circuit comprises a control module 101, a first filtering module 102, a first switching module 103, a second switching module 104, a second filtering module 105, a third switching module 106 and a fourth switching module 107;
the control module 101 is configured to generate a first control signal and a second control signal;
the first filtering module 102 is connected between the first switch module 103 and the second switch module 104, and includes M low-pass filters connected in parallel and having different cut-off frequencies; wherein M is more than or equal to 2;
The first switch module 103 and the second switch module 104 are respectively connected to the control module 101, and configured to gate a low-pass filter in the first filtering module 102 according to the first control signal, so as to perform filtering processing on a signal transmitted or/and received by a first radio frequency transceiver module of the dual-frequency network device through the gated low-pass filter;
the second filtering module 105 is connected between the third switching module 106 and the fourth switching module 107, and includes N high-pass filters connected in parallel and having different cut-off frequencies; wherein N is more than or equal to 2;
the third switching module 106 and the fourth switching module 107 are respectively connected to the control module 101, and are configured to gate a high-pass filter in the second filtering module 105 according to the second control signal, so as to perform filtering processing on a signal transmitted or/and received by a second radio frequency transceiver module of the dual-frequency network device through the gated high-pass filter.
specifically, the control module generates a corresponding first control signal and a second control signal according to the working frequency band of the dual-frequency network device, sends the generated first control signal to the first switch module and the second switch module, and sends the generated second control signal to the third switch module and the fourth switch module; the first switch module and the second switch module select one low-pass filter in the first filter module according to the received first control signal, which is equivalent to gating one radio frequency link, the signal transmitted or/and received by the first radio frequency transceiver module of the dual-frequency network equipment passes through the radio frequency link, the selected low-pass filter can filter the signal passing through the radio frequency link, and the interference signal except the cut-off frequency of the low-pass filter is filtered out completely, so that the signal transmitted by the first radio frequency transceiver module of the dual-frequency network equipment cannot interfere with the second radio frequency transceiver module; similarly, the third switch module and the fourth switch module gate a high-pass filter in the second filter module according to the received second control signal, which is equivalent to gating a radio frequency link, and the signal transmitted or/and received by the second radio frequency transceiver module of the dual-frequency network device passes through the radio frequency link, the selected high-pass filter can filter the signal passing through the radio frequency link, and filter out the interference signal except the cutoff frequency of the high-pass filter, so that the signal transmitted by the second radio frequency transceiver module of the dual-frequency network device does not interfere with the first radio frequency transceiver module.
it should be noted that the cut-off frequency of the low-pass filter may be set according to the working frequency band of the first radio frequency transceiver module of the dual-frequency network device, and the cut-off frequency of the high-pass filter may be set according to the working frequency band of the second radio frequency transceiver module of the dual-frequency network device.
the radio frequency isolation circuit provided by the embodiment of the invention has the advantages that the control module generates a corresponding control signal according to the working frequency band of the radio frequency transceiving module of the dual-frequency network device, the control signal controls the switch module to correspond to one filter in the gating filter module, the selective filtering processing of the signals transmitted or/and received by the radio frequency transceiving module of the dual-frequency network device is realized, the other radio frequency transceiving module is attenuated as much as possible under the condition of meeting the in-band low insertion loss of one radio frequency transceiving module, the mutual interference between the two radio frequency transceiving modules is reduced, the in-band insertion loss of a radio frequency link can be reduced, the interference suppression capability is improved, the scheme is simple, the software control and hardware design are easy to realize, and the cost is low.
it should be noted that, for a network device simultaneously including a multi-frequency module circuit, a large attenuation isolation filter is required due to interference between adjacent frequency bands, and when the adjacent frequency bands are too small, an excessive in-band insertion loss caused by the isolation filter is a problem, a suitable combination of filtering modules may be selected according to working states of different radio frequency modules, and when the preset is performed, due to different cut-off frequencies of the filters, the selected combination of filtering modules may enable a radio frequency link to have a smaller in-band insertion loss, and simultaneously, isolation requirements of different radio frequency transceiver modules may be satisfied, that is, interference suppression requirements of the radio frequency modules between the adjacent frequency bands may be satisfied.
referring to fig. 2, which is a schematic structural diagram of another preferred embodiment of the radio frequency isolation circuit provided in the present invention, the first switch module includes a first radio frequency switch; the input end of the first radio frequency switch is connected with the first control signal output end of the control module, and the output ends of the first radio frequency switches are correspondingly connected with the first ends of the M low-pass filters one by one;
The second switch module comprises a second radio frequency switch; the input end of the second radio frequency switch is connected with the first control signal output end of the control module, and the output ends of the second radio frequency switch are correspondingly connected with the second ends of the M low-pass filters one by one;
the third switching module comprises a third radio frequency switch; the input end of the third radio frequency switch is connected with the second control signal output end of the control module, and the output ends of the third radio frequency switch are correspondingly connected with the first ends of the N high-pass filters one by one;
the fourth switch module comprises a fourth radio frequency switch; the input end of the fourth radio frequency switch is connected with the second control signal output end of the control module, and the output end of the fourth radio frequency switch is connected with the second ends of the N high-pass filters in a one-to-one correspondence mode.
specifically, with reference to the foregoing embodiments, in the embodiments of the present invention, the first radio frequency switch and the second radio frequency switch are used to selectively switch between the low pass filters with different cut-off frequencies according to the first control signal, and the third radio frequency switch and the fourth radio frequency switch are used to selectively switch between the high pass filters with different cut-off frequencies according to the second control signal, so that the gated radio frequency link has a smaller in-band insertion loss, and a higher out-of-band rejection capability is obtained at the same time, so as to reduce mutual interference between two radio frequency transceiver modules of the dual-band network device.
It should be noted that the rf switch generally has one input end and a plurality of output ends, and the number of the output ends may be determined according to the number of the parallel filters included in the filtering module, for example, the first switch module includes two low-pass filters, the first rf switch and the second rf switch both select the rf switch having two output ends, if the number of the output ends of a single rf switch cannot be matched with the number of the filters, a plurality of rf switches connected in parallel may be adopted to ensure that each filter is connected to the output ends of the rf switch in a one-to-one correspondence, and because the rf circuit requires strict impedance matching, if the rf switch is only arranged at one end of the filtering module, the other end will have an rf branch, which results in uncontrollable impedance, and therefore, corresponding rf switches need to be arranged at both ends of the filter.
In a further preferred embodiment, the first radio frequency transceiver module of the dual-frequency network device comprises a 5GHz radio frequency transceiver, and the second radio frequency transceiver module of the dual-frequency network device comprises a 6GHz radio frequency transceiver; the control module is specifically configured to:
generating a first control signal according to a first working frequency band of the 5GHz radio frequency transceiver;
and generating a second control signal according to a second working frequency band of the 6GHz radio frequency transceiver.
Specifically, in combination with the above embodiments, the first rf transceiver module of the dual-band network device includes a 5GHz rf transceiver, the second rf transceiver module of the dual-band network device includes a 6GHz rf transceiver, namely, the embodiment of the invention is applied to the isolation design of the dual-frequency network equipment supporting the simultaneous work of the 5GHz frequency band and the 6GHz frequency band, when the 5GHz radio frequency transceiver and the 6GHz radio frequency transceiver of the dual-frequency network equipment work, the control module firstly obtains the working frequency bands of the 5GHz radio frequency transceiver and the 6GHz radio frequency transceiver, thereby generating a corresponding first control signal according to a first working frequency band corresponding to the 5GHz radio frequency transceiver to control the first radio frequency switch and the second radio frequency switch to gate the corresponding low pass filter access, and generating a corresponding second control signal according to a second working frequency band corresponding to the 6GHz radio frequency transceiver so as to control the third radio frequency switch and the fourth radio frequency switch to gate the corresponding high-pass filter access.
As a modification of the above scheme, as shown in fig. 2, the first operating frequency band includes a first sub-frequency band and a second sub-frequency band; the first filtering module comprises a first low-pass filter and a second low-pass filter; the control module is specifically configured to:
When the 5GHz radio frequency transceiver works in the first sub-frequency band, generating a first control signal for gating the first low-pass filter;
and when the 5GHz radio frequency transceiver works in the second sub-frequency band, generating a first control signal for gating the second low-pass filter.
Specifically, in combination with the above embodiments, in order to enhance the filtering effect, the first operating frequency band corresponding to the 5GHz radio frequency transceiver may be subdivided into a first sub-frequency band and a second sub-frequency band, and a low pass filter with a corresponding cut-off frequency is respectively set for the first sub-frequency band and the second sub-frequency band, when the 5GHz radio frequency transceiver operates in the first sub-frequency band, the control module generates a first control signal for gating the first low pass filter according to a frequency range of the first sub-frequency band, and when the 5GHz radio frequency transceiver operates in the second sub-frequency band, the control module generates a first control signal for gating the second low pass filter according to a frequency range of the second sub-frequency band,
it should be noted that the number of sub-bands divided by the first operating band of the 5GHz radio frequency transceiver may be set according to actual needs, and it is required to ensure that each sub-band is provided with a low pass filter with a corresponding cut-off frequency to perform filtering processing on an out-of-band interference signal of each sub-band, where the design of each low pass filter needs to meet the requirement of having low insertion loss in the corresponding sub-band, and meanwhile, has a large out-of-band rejection capability for a part of sub-bands of the second radio frequency transceiver module, so as to meet the requirement of having small in-band insertion loss and at the same time, reduce interference on the part of frequency bands of the second radio frequency transceiver module.
Preferably, the frequency range of the first operating frequency band is 5.17 GHz-5.835 GHz; the frequency range of the first sub-band is 5.17 GHz-5.65 GHz, and the frequency range of the second sub-band is 5.65 GHz-5.835 GHz.
Preferably, the cut-off frequency of the first low-pass filter is 5.85GHz, and the cut-off frequency of the second low-pass filter is 6.2 GHz.
Specifically, with reference to the above embodiment, the frequency range of the first working frequency band corresponding to the 5GHz radio frequency transceiver is 5.17GHz to 5.835GHz, the frequency range of the divided first sub-frequency band is 5.17GHz to 5.65GHz, and then the cut-off frequency of the first low-pass filter is 5.85GHz, which can achieve that the in-band insertion loss of the 5.17GHz to 5.65GHz frequency band is less than 1dB, and the out-of-band attenuation of the 6.005GHz to 7.105GHz frequency band (the working frequency band corresponding to the 6GHz radio frequency transceiver) is greater than 50 dB; the frequency range of the divided second sub-frequency band is 5.65 GHz-5.835 GHz, the cut-off frequency of the second low-pass filter is 6.2GHz, the in-band insertion loss of the 5.17 GHz-5.835 GHz frequency band can be less than 1dB, and the out-band attenuation of the 6.425 GHz-7.105 GHz frequency band (the working frequency band corresponding to the 6GHz radio-frequency transceiver) is more than 50 dB.
As a modification of the above scheme, with reference to fig. 2, the second operating frequency band includes a third frequency sub-band and a fourth frequency sub-band; the second filtering module comprises a first high-pass filter and a second high-pass filter; the control module is specifically configured to:
when the 6GHz radio frequency transceiver works in the third sub-frequency band, generating a second control signal for gating the first high-pass filter;
And when the 6GHz radio frequency transceiver works in the fourth sub-frequency band, generating a second control signal for gating the second high-pass filter.
specifically, in combination with the above embodiment, in order to enhance the filtering effect, the second operating frequency band corresponding to the 6GHz radio frequency transceiver may be subdivided into a third frequency sub-band and a fourth frequency sub-band, and a high pass filter with a corresponding cut-off frequency is respectively set for the third frequency sub-band and the fourth frequency sub-band, when the 6GHz radio frequency transceiver operates in the third frequency sub-band, the control module generates a second control signal for gating the first high pass filter according to a frequency range of the third frequency sub-band, and when the 6GHz radio frequency transceiver operates in the fourth frequency sub-band, the control module generates a second control signal for gating the second high pass filter according to a frequency range of the fourth frequency sub-band,
It should be noted that the number of sub-bands divided by the second operating band of the 6GHz radio frequency transceiver may be set according to actual needs, and it is required to ensure that each sub-band is provided with a high pass filter with a corresponding cut-off frequency to perform filtering processing on an out-of-band interference signal of each sub-band, where the design of each high pass filter needs to meet the requirement of having low insertion loss in the corresponding sub-band, and meanwhile, has a large out-of-band rejection capability for a part of sub-bands of the first radio frequency transceiver module, so as to meet the requirement of having small in-band insertion loss and at the same time, reduce interference on the part of frequency bands of the first radio frequency transceiver module.
Preferably, the frequency range of the second operating frequency band is 6.005 GHz-7.105 GHz; the frequency range of the third sub-band is 6.005 GHz-6.425 GHz, and the frequency range of the fourth sub-band is 6.425 GHz-7.105 GHz.
preferably, the cut-off frequency of the first high-pass filter is 5.85GHz, and the cut-off frequency of the second high-pass filter is 6.2 GHz.
specifically, with reference to the above embodiment, the frequency range of the second operating frequency band corresponding to the 6GHz radio frequency transceiver is 6.005GHz to 7.105GHz, the frequency range of the divided third sub-frequency band is 6.005GHz to 6.425GHz, and then the cut-off frequency of the first high-pass filter is 5.85GHz, which can achieve that the in-band insertion loss of the 6.005GHz to 7.105GHz frequency band is less than 1dB, and the out-of-band attenuation of the 5.17GHz to 5.65GHz frequency band (the operating frequency band corresponding to the 5GHz radio frequency transceiver) is greater than 50 dB; the frequency range of the divided fourth sub-band is 6.425 GHz-7.105 GHz, the cut-off frequency of the second high-pass filter is 6.2GHz, the in-band insertion loss of the band from 6.425GHz to 7.105GHz can be less than 1dB, and the out-band attenuation of the band from 5.17GHz to 5.835GHz (the working band corresponding to the 5GHz radio-frequency transceiver) is more than 50 dB.
With reference to the above embodiments, when the 5GHz radio frequency transceiver operates in the first sub-band of 5.17GHz to 5.65GHz, the first low pass filter having a cutoff frequency of 5.85GHz is gated by the first control signal, when the 5GHz radio frequency transceiver operates in the second sub-band of 5.65GHz to 5.835GHz, the second low pass filter having a cutoff frequency of 6.2GHz is gated by the first control signal, when the 6GHz radio frequency transceiver operates in the third sub-band of 6.005GHz to 6.425GHz, the first high pass filter having a cutoff frequency of 5.85GHz is gated by the second control signal, when the 6GHz radio frequency transceiver operates in the fourth sub-band of 6.425GHz to 7.105GHz, the second high pass filter having a cutoff frequency of 6.2GHz is gated by the second control signal, so that when the 5GHz radio frequency transceiver operates in the low frequency band (5.17GHz to 5.65GHz), the cutoff frequency of the gated low pass filter is low, and when the 5GHz radio frequency operates in the high frequency band (5.65GHz to 5.835GHz), the cut-off frequency of the gated low-pass filter is high, the 6GHz radio frequency transceiver is attenuated as much as possible under the condition of meeting the requirement of in-band low insertion loss, and the 6GHz radio frequency transceiver has the same principle, so that the mutual interference can be reduced, and the filter is easy to design and realize and has low cost due to wide frequency band interval.
it should be added that, when the 5GHz rf transceiver operates in the high frequency band (5.65 GHz-5.835 GHz) and the 6GHz rf transceiver operates in the low frequency band (6.005 GHz-6.425 GHz), because the bandwidths of the two frequency bands are similar, the frequency band can be skipped by controlling one rf transceiver of the dual-frequency network device, or the 5GHz rf transceiver is constrained to operate in the low channel of the high frequency band and the 6GHz rf transceiver operates in the high channel of the low frequency band, so as to reduce the mutual interference between the 5GHz rf transceiver and the 6GHz rf transceiver.
the working state of the radio frequency transceiver in the dual-frequency network device is controlled by the CPU of the dual-frequency network device, and the frequency band can be skipped by disabling the working frequency band by the CPU, for example, the 5GHz radio frequency transceiver works in the high frequency band (5.65 GHz-5.835 GHz), at this time, the 6GHz radio frequency transceiver wants to work in the low frequency band (6.005 GHz-6.425 GHz), if the radio frequency transceiver is in the automatic configuration state, the CPU detects the state, and the CPU directly prevents the 6GHz radio frequency transceiver from automatically configuring in the low frequency band; if the radio frequency transceiver is in the page manual configuration state, the user can be reminded that the low frequency band of the 6GHz radio frequency transceiver is not configurable, or the low frequency band of the 6GHz radio frequency transceiver is directly forbidden; similarly, the channel constraint may be implemented by disabling the operating channel in the operating frequency band by the CPU, for example, when the 5GHz radio transceiver operates in the CH165 channel (center frequency 5825MHz), and the 6GHz radio transceiver wants to operate in the CH201 channel (center frequency 6005MHz), and when the CPU detects that such a situation occurs, the CPU prompts the user that there is serious mutual interference between the 5GHz band and the 6GHz band, so that the user staggers the channel configuration when selecting the configuration, the 5GHz radio transceiver is first configured to the CH157 to CH165 channels (frequency range is 5785MHz to 5835MHz), and the configuration page of the 6GHz radio transceiver is prohibited from being configured to the CH201 to CH221 (frequency range is 6.005GHz to 6.205GHz), otherwise, the configuration page is not repeated.
referring to fig. 3, it is a schematic structural diagram of a preferred embodiment of a dual-band network device provided in the present invention, where the dual-band network device includes a first rf transceiver module 201, a second rf transceiver module 202, a first antenna 203, a second antenna 204, and an rf isolation circuit according to any of the above embodiments;
The first radio frequency transceiver module 201 is connected with the first switch module 103 of the radio frequency isolation circuit, and the first antenna 203 is connected with the second switch module 104 of the radio frequency isolation circuit;
the second rf transceiver module 202 is connected to the third switch module 106 of the rf isolation circuit, and the second antenna 204 is connected to the fourth switch module 107 of the rf isolation circuit;
The first radio frequency transceiver module 201 transmits or/and receives signals through the first antenna 203;
the second rf transceiver module 202 transmits or/and receives signals through the second antenna 204.
Specifically, when a first rf transceiver module of the dual-band network device transmits or/and receives a signal through a first antenna, a control module of the rf isolation circuit (the controllable module may be a control module of the dual-band network device, for example, a CPU of the dual-band network device) generates a corresponding first control signal according to an operating frequency band of the first rf transceiver module, and transmits the generated first control signal to a first switch module and a second switch module, the first switch module and the second switch module select a low-pass filter in the first filtering module according to the received first control signal, which is equivalent to gating a rf link through which the signal transmitted or/and received by the first rf transceiver module passes, the selected low-pass filter performs filtering processing on the signal passing through the rf link, and filters out interference signals except for a cutoff frequency of the low-pass filter, so that the signal transmitted by the first radio frequency transceiver module does not interfere with the second radio frequency transceiver module; similarly, when the second rf transceiver module of the dual-band network device transmits or/and receives signals through the second antenna, the control module of the radio frequency isolation circuit generates a corresponding second control signal according to the working frequency band of the second radio frequency transceiver module, and the third switch module and the fourth switch module gate a high-pass filter in the second filtering module according to the received second control signal, which is equivalent to gating a radio frequency link, the signal transmitted or/and received by the second radio frequency transceiver module passes through the radio frequency link, the selected high-pass filter filters the signal passing through the radio frequency link, and the interference signal except the cut-off frequency of the high-pass filter is filtered out completely, so that the signal transmitted by the second radio frequency transceiver module does not interfere with the first radio frequency transceiver module.
It should be noted that, in the embodiment of the present invention, the working principle and the implemented technical effect of the radio frequency isolation circuit included in the dual-frequency network device are respectively the same as the working principle and the implemented technical effect of the radio frequency isolation circuit described in the foregoing embodiment, and are not described herein again.
According to the dual-frequency network equipment provided by the embodiment of the invention, the radio frequency isolation circuit is arranged in the dual-frequency network equipment, the selective filtering processing of the signals transmitted or/and received by the radio frequency transceiver module of the dual-frequency network equipment is realized according to the filtering module of the radio frequency isolation circuit, and under the condition of meeting the in-band low insertion loss of one radio frequency transceiver module, the other radio frequency transceiver module is attenuated as much as possible so as to reduce the mutual interference between the two radio frequency transceiver modules, thereby reducing the in-band insertion loss of a radio frequency link and improving the interference suppression capability.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. a radio frequency isolation circuit, wherein the circuit is adapted for use in a dual frequency network device; the circuit comprises a control module, a first filtering module, a first switch module, a second filtering module, a third switch module and a fourth switch module;
The control module is used for generating a first control signal and a second control signal;
the first filtering module is connected between the first switch module and the second switch module and comprises M low-pass filters which are connected in parallel and have different cut-off frequencies; wherein M is more than or equal to 2;
The first switch module and the second switch module are respectively connected with the control module and used for gating one low-pass filter in the first filtering module according to the first control signal so as to filter signals transmitted or/and received by the first radio frequency transceiving module of the dual-frequency network device through the gated low-pass filter;
The second filtering module is connected between the third switching module and the fourth switching module and comprises N high-pass filters which are connected in parallel and have different cut-off frequencies; wherein N is more than or equal to 2;
The third switch module and the fourth switch module are respectively connected with the control module and used for gating one high-pass filter in the second filtering module according to the second control signal so as to filter signals transmitted or/and received by the second radio frequency transceiving module of the dual-frequency network device through the gated high-pass filter.
2. The radio frequency isolation circuit of claim 1,
the first switch module comprises a first radio frequency switch; the input end of the first radio frequency switch is connected with the first control signal output end of the control module, and the output ends of the first radio frequency switches are correspondingly connected with the first ends of the M low-pass filters one by one;
the second switch module comprises a second radio frequency switch; the input end of the second radio frequency switch is connected with the first control signal output end of the control module, and the output ends of the second radio frequency switch are correspondingly connected with the second ends of the M low-pass filters one by one;
The third switching module comprises a third radio frequency switch; the input end of the third radio frequency switch is connected with the second control signal output end of the control module, and the output ends of the third radio frequency switch are correspondingly connected with the first ends of the N high-pass filters one by one;
The fourth switch module comprises a fourth radio frequency switch; the input end of the fourth radio frequency switch is connected with the second control signal output end of the control module, and the output end of the fourth radio frequency switch is connected with the second ends of the N high-pass filters in a one-to-one correspondence mode.
3. The radio frequency isolation circuit of claim 1, wherein the first radio frequency transceiver module of the dual-frequency network device comprises a 5GHz radio frequency transceiver, wherein the second radio frequency transceiver module of the dual-frequency network device comprises a 6GHz radio frequency transceiver; the control module is specifically configured to:
generating a first control signal according to a first working frequency band of the 5GHz radio frequency transceiver;
And generating a second control signal according to a second working frequency band of the 6GHz radio frequency transceiver.
4. The radio frequency isolation circuit of claim 3, wherein the first operating frequency band comprises a first sub-band and a second sub-band; the first filtering module comprises a first low-pass filter and a second low-pass filter; the control module is specifically configured to:
when the 5GHz radio frequency transceiver works in the first sub-frequency band, generating a first control signal for gating the first low-pass filter;
And when the 5GHz radio frequency transceiver works in the second sub-frequency band, generating a first control signal for gating the second low-pass filter.
5. The radio frequency isolation circuit according to claim 4, wherein the first operating frequency band has a frequency range of 5.17GHz to 5.835 GHz; the frequency range of the first sub-band is 5.17 GHz-5.65 GHz, and the frequency range of the second sub-band is 5.65 GHz-5.835 GHz.
6. The radio frequency isolation circuit according to claim 5, wherein the cutoff frequency of the first low pass filter is 5.85GHz and the cutoff frequency of the second low pass filter is 6.2 GHz.
7. the radio frequency isolation circuit of claim 3, wherein the second operating frequency band comprises a third frequency sub-band and a fourth frequency sub-band; the second filtering module comprises a first high-pass filter and a second high-pass filter; the control module is specifically configured to:
when the 6GHz radio frequency transceiver works in the third sub-frequency band, generating a second control signal for gating the first high-pass filter;
and when the 6GHz radio frequency transceiver works in the fourth sub-frequency band, generating a second control signal for gating the second high-pass filter.
8. the radio frequency isolation circuit according to claim 7, wherein the second operating band has a frequency in a range of 6.005 GHz-7.105 GHz; the frequency range of the third sub-band is 6.005 GHz-6.425 GHz, and the frequency range of the fourth sub-band is 6.425 GHz-7.105 GHz.
9. the radio frequency isolation circuit of claim 8, wherein the cutoff frequency of the first high pass filter is 5.85GHz and the cutoff frequency of the second high pass filter is 6.2 GHz.
10. A dual-frequency network device, characterized in that it comprises a first radio frequency transceiver module, a second radio frequency transceiver module, a first antenna, a second antenna and a radio frequency isolation circuit according to any one of claims 1 to 9;
The first radio frequency transceiver module is connected with a first switch module of the radio frequency isolation circuit, and the first antenna is connected with a second switch module of the radio frequency isolation circuit;
The second radio frequency transceiver module is connected with a third switch module of the radio frequency isolation circuit, and the second antenna is connected with a fourth switch module of the radio frequency isolation circuit;
The first radio frequency transceiver module transmits or/and receives signals through the first antenna;
and the second radio frequency transceiver module transmits or/and receives signals through the second antenna.
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| CN201910821007.2A CN110581718A (en) | 2019-08-30 | 2019-08-30 | Radio frequency isolation circuit and dual-frequency network equipment |
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| CN201910821007.2A CN110581718A (en) | 2019-08-30 | 2019-08-30 | Radio frequency isolation circuit and dual-frequency network equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922832A (en) * | 2020-07-09 | 2022-01-11 | 慧与发展有限责任合伙企业 | Selective filtering for continuous 5GHz and 6GHz operation of network devices |
| CN114598372A (en) * | 2020-11-19 | 2022-06-07 | 中国移动通信有限公司研究院 | Relay device and method |
| CN116018759A (en) * | 2020-07-14 | 2023-04-25 | 高通股份有限公司 | Filter selection technique for isolating a receiver from a transmission signal in a wireless communication device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005184149A (en) * | 2003-12-16 | 2005-07-07 | Matsushita Electric Ind Co Ltd | Sound reproducing system |
| CN201976076U (en) * | 2011-01-21 | 2011-09-14 | 广州海格通信集团股份有限公司 | Diplexer |
| CN203645705U (en) * | 2013-12-27 | 2014-06-11 | 陕西烽火电子股份有限公司 | Filtering device capable of realizing short-wave communication and ultra-short-wave communication simultaneously |
| US20150119115A1 (en) * | 2009-11-16 | 2015-04-30 | Oluf Bagger | Multiband rf device |
| CN108390679A (en) * | 2018-02-26 | 2018-08-10 | 广东小天才科技有限公司 | Communication means based on multiple antennas radio-frequency front-end and multiple antennas RF front-end circuit |
| CN109560832A (en) * | 2019-01-24 | 2019-04-02 | 广西芯百特微电子有限公司 | A kind of radio circuit and terminal for 5G communication |
-
2019
- 2019-08-30 CN CN201910821007.2A patent/CN110581718A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005184149A (en) * | 2003-12-16 | 2005-07-07 | Matsushita Electric Ind Co Ltd | Sound reproducing system |
| US20150119115A1 (en) * | 2009-11-16 | 2015-04-30 | Oluf Bagger | Multiband rf device |
| CN201976076U (en) * | 2011-01-21 | 2011-09-14 | 广州海格通信集团股份有限公司 | Diplexer |
| CN203645705U (en) * | 2013-12-27 | 2014-06-11 | 陕西烽火电子股份有限公司 | Filtering device capable of realizing short-wave communication and ultra-short-wave communication simultaneously |
| CN108390679A (en) * | 2018-02-26 | 2018-08-10 | 广东小天才科技有限公司 | Communication means based on multiple antennas radio-frequency front-end and multiple antennas RF front-end circuit |
| CN109560832A (en) * | 2019-01-24 | 2019-04-02 | 广西芯百特微电子有限公司 | A kind of radio circuit and terminal for 5G communication |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113922832A (en) * | 2020-07-09 | 2022-01-11 | 慧与发展有限责任合伙企业 | Selective filtering for continuous 5GHz and 6GHz operation of network devices |
| CN116018759A (en) * | 2020-07-14 | 2023-04-25 | 高通股份有限公司 | Filter selection technique for isolating a receiver from a transmission signal in a wireless communication device |
| CN114598372A (en) * | 2020-11-19 | 2022-06-07 | 中国移动通信有限公司研究院 | Relay device and method |
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