CN113783583B - MIMO low-frequency broadband transceiver circuit structure - Google Patents
MIMO low-frequency broadband transceiver circuit structure Download PDFInfo
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- CN113783583B CN113783583B CN202111223020.1A CN202111223020A CN113783583B CN 113783583 B CN113783583 B CN 113783583B CN 202111223020 A CN202111223020 A CN 202111223020A CN 113783583 B CN113783583 B CN 113783583B
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- 238000004088 simulation Methods 0.000 abstract description 10
- 230000003321 amplification Effects 0.000 description 14
- 238000003199 nucleic acid amplification method Methods 0.000 description 14
- 238000004891 communication Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 5
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- 238000005516 engineering process Methods 0.000 description 2
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Classifications
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention relates to a MIMO low-frequency broadband receiving and transmitting circuit structure, which comprises a plurality of channels, wherein each channel comprises a receiving circuit and a transmitting circuit, the receiving circuit and the transmitting circuit are both connected with a power divider, the input end of the receiving circuit is connected with the power divider, the output end of the receiving circuit is connected with an analog-to-digital converter, the input end of the transmitting circuit is connected with a digital-to-analog converter, and the output end of the receiving circuit is connected with the power divider. The MIMO low-frequency broadband receiving and transmitting circuit structure has wide frequency range coverage, the range is 3 kHz-500 MHz, and the ultra-long wave to ultra-short wave frequency range is covered; the bandwidth of the signal reaches 500MHz, thus providing possibility for MIMO simulation of low-frequency signals. The circuit structure integrates the transceiver circuit, and the transceiver shares one port, so that the number of external ports is reduced, the dynamic range of input and output signals is large, and signal simulation in various power ranges is provided.
Description
Technical Field
The invention relates to the field of communication circuit structures, in particular to the field of radio frequency microwaves, and specifically relates to a MIMO low-frequency broadband receiving and transmitting circuit structure.
Background
With the rapid development of communication, whether the size, integration and operation speed of the device are all smaller, more integrated and faster, the frequency of signal processing is higher and higher, and the frequency is from 4G to 5G to millimeter wave. Of course, the low frequency has many applications when the frequency is developed to the high frequency, the wavelength of the low frequency is long, the diffraction performance is good, the propagation distance is long, meanwhile, related equipment is simple, the circuit scheduling is easy, the anti-destruction capability is also very strong, the low frequency communication circuit still plays a unique important role in many occasions, such as international communication, flood prevention and disaster relief, marine rescue, military communication and the like, and therefore the low frequency communication circuit plays a key role.
The MIMO technology is used as one of the key technologies of 5G, so that the channel capacity and the frequency utilization rate are improved, the MIMO channel simulator is just an instrument for simulating the MIMO channel in the space, various channels in the space can be simulated, the field test is not needed, the transmission of signals can be verified in a laboratory, and great convenience is provided for research.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the MIMO low-frequency broadband receiving and transmitting circuit structure which has the advantages of simple structure, wide frequency range coverage and wider application range.
In order to achieve the above object, the MIMO low-frequency broadband transceiving circuit of the present invention has the structure as follows:
The MIMO low-frequency broadband receiving and transmitting circuit structure is mainly characterized by comprising a plurality of channels, each channel comprises a receiving circuit and a transmitting circuit, the receiving circuit and the transmitting circuit are connected with a power divider, the input end of the receiving circuit is connected with the power divider, the output end of the receiving circuit is connected with an analog-to-digital converter, the input end of the transmitting circuit is connected with a digital-to-analog converter, and the output end of the receiving circuit is connected with the power divider.
Preferably, the receiving circuit comprises three receiving switch amplifying circuit modules, three receiving filters and a receiving digital control attenuator, the three receiving switch amplifying circuit modules have the same structure and are respectively a first receiving switch amplifying circuit module, a second receiving switch amplifying circuit module and a third receiving switch amplifying circuit module, the three receiving filters are respectively a first receiving filter, a second receiving filter and a third receiving filter, the first receiving switch amplifying circuit module, the first receiving filter, the second receiving switch amplifying circuit module, the second receiving filter, the receiving digital control attenuator, the third receiving switch amplifying circuit module and the third receiving filter are connected in sequence, the input end of the first receiving switch amplifying circuit module is connected with the power divider, the output end of the third receiving filter is connected with the analog-to-digital converter, the receiving filter is used for filtering out-of-band spurious, and the receiving numerical control attenuator is used for controlling the accuracy of power and converting the power signal in the range into the power range supporting the processing of the analog-to-digital converter.
Preferably, the switch amplifying circuit module comprises two receiving radio frequency switches and a receiving operational amplifier, the two receiving radio frequency switches are respectively connected with the input end and the output end of the receiving operational amplifier, the two receiving radio frequency switches are connected, the receiving radio frequency switches are used for selecting an amplifying passage or a direct passage of a receiving signal, and the receiving operational amplifier is used for amplifying the receiving signal.
Preferably, the transmitting circuit comprises a plurality of 20dB numerical control attenuators, a transmitting numerical control attenuator, a transmitting switch amplifying circuit module and a transmitting filter, wherein the plurality of 20dB numerical control attenuators, the transmitting numerical control attenuator, the transmitting switch amplifying circuit module and the transmitting filter are sequentially connected, the plurality of 20dB numerical control attenuators are connected in series, the input end of the 20dB numerical control attenuator is connected with the digital-to-analog converter, and the output end of the transmitting filter is connected with the power divider.
Preferably, the transmitting switch amplifying circuit module comprises two transmitting radio frequency switches and a transmitting operational amplifier, the two transmitting radio frequency switches are respectively connected with the input end and the output end of the transmitting operational amplifier, the two transmitting radio frequency switches are connected, the transmitting radio frequency switches are used for selecting an amplifying passage or a direct passage of a transmitting signal, and the transmitting operational amplifier is used for amplifying the transmitting signal.
Preferably, the 20dB digital controlled attenuator has two states of 0dB and 20dB attenuation.
Preferably, the receiving operational amplifier is an inverting amplifier and the gain bandwidth product is 8GHz.
Preferably, the dynamic attenuation range of the receiving numerical control attenuator is 31.5dB, and the attenuation step is 0.5dB; the dynamic attenuation range of the emission numerical control attenuator is 31.5dB, and the attenuation step is 0.5dB.
The MIMO low-frequency broadband receiving and transmitting circuit structure has wide frequency range coverage, the range is 3 kHz-500 MHz, and the ultra-long wave to ultra-short wave frequency range is covered; the bandwidth of the signal reaches 500MHz, thus providing possibility for MIMO simulation of low-frequency signals. The circuit structure integrates the transceiver circuit, and the transceiver shares one port, so that the number of external ports is reduced, the dynamic range of input and output signals is large, and signal simulation in various power ranges is provided.
Drawings
Fig. 1 is a block diagram of a channel simulator of a MIMO low-frequency broadband transceiving circuit structure according to the present invention.
Fig. 2 is a block diagram of a MIMO low-frequency broadband transceiving circuit of the MIMO low-frequency broadband transceiving circuit structure of the present invention.
Fig. 3 is an operational amplifier inverting amplification circuit diagram of the MIMO low frequency broadband transceiving circuit structure of the present invention.
Reference numerals:
1. Power divider
2. Receiving radio frequency switch
3. Receiving operational amplifier
4. Receiving filter
5. Receiving digital control attenuator
6. Transmitting filter
7. Transmitting radio frequency switch
8. Transmitting operational amplifier
9. Emission numerical control attenuator
10 20DB digital control attenuator
Detailed Description
In order to more clearly describe the technical contents of the present invention, a further description will be made below in connection with specific embodiments.
The MIMO low-frequency broadband receiving and transmitting circuit structure comprises a plurality of channels, wherein each channel comprises a receiving circuit and a transmitting circuit, the receiving circuit and the transmitting circuit are both connected with a power divider, the input end of the receiving circuit is connected with the power divider, the output end of the receiving circuit is connected with an analog-to-digital converter, the input end of the transmitting circuit is connected with a digital-to-analog converter, and the output end of the receiving circuit is connected with the power divider.
As a preferred embodiment of the present invention, the receiving circuit includes three sets of receiving switch amplifying circuit modules, three receiving filters and a receiving digital control attenuator, the three sets of receiving switch amplifying circuit modules are all the same in structure and are respectively a first receiving switch amplifying circuit module, a second receiving switch amplifying circuit module and a third receiving switch amplifying circuit module, the three receiving filters are all the same and are respectively a first receiving filter, a second receiving filter and a third receiving filter, the first receiving switch amplifying circuit module, the first receiving filter, the second receiving switch amplifying circuit module, the second receiving filter, the receiving digital control attenuator, the third receiving switch amplifying circuit module and the third receiving filter are sequentially connected, an input end of the first receiving switch amplifying circuit module is connected with the power divider, an output end of the third receiving filter is connected with the analog-to-digital converter, the receiving filter is used for filtering spurious signals out of band, and the receiving digital control attenuator is used for controlling the accuracy of power, and converting power signals within a range into power within a supporting range of analog-to-digital signal processing.
As a preferred embodiment of the present invention, the switch amplifying circuit module includes two receiving radio frequency switches and a receiving operational amplifier, the two receiving radio frequency switches are respectively connected to an input end and an output end of the receiving operational amplifier, and the two receiving radio frequency switches are connected, the receiving radio frequency switches are used for selecting an amplifying path or a direct path of a receiving signal, and the receiving operational amplifier is used for amplifying the receiving signal.
As a preferred embodiment of the invention, the transmitting circuit comprises a plurality of 20dB numerical control attenuators, a transmitting numerical control attenuator, a transmitting switch amplifying circuit module and a transmitting filter, wherein the plurality of 20dB numerical control attenuators, the transmitting numerical control attenuator, the transmitting switch amplifying circuit module and the transmitting filter are sequentially connected, the plurality of 20dB numerical control attenuators are connected in series, the input end of the 20dB numerical control attenuator is connected with the digital-to-analog converter, and the output end of the transmitting filter is connected with the power divider.
As a preferred embodiment of the invention, the transmitting switch amplifying circuit module comprises two transmitting radio frequency switches and a transmitting operational amplifier, wherein the two transmitting radio frequency switches are respectively connected with the input end and the output end of the transmitting operational amplifier, the two transmitting radio frequency switches are connected, the transmitting radio frequency switches are used for selecting an amplifying passage or a direct passage of a transmitting signal, and the transmitting operational amplifier is used for amplifying the transmitting signal.
As a preferred embodiment of the invention, the 20dB digitally controlled attenuator has two states, 0dB and 20dB attenuation.
As a preferred embodiment of the present invention, the receiving operational amplifier is an inverting amplification, and the gain bandwidth product is 8GHz.
As a preferred embodiment of the invention, the dynamic attenuation range of the receiving digital control attenuator is 31.5dB, and the attenuation step is 0.5dB; the dynamic attenuation range of the emission numerical control attenuator is 31.5dB, and the attenuation step is 0.5dB.
In a specific embodiment of the invention, a MIMO low-frequency broadband receiving and transmitting circuit is provided, and the frequency range is 3 kHz-500 MHz. The traditional low-frequency circuit generally only covers a specific frequency band, such as a long wave or a short wave, the receiving and transmitting circuit covers the frequency band from the ultra-long wave to the ultra-short wave, the bandwidth is 500MHz, the method can be used for using each wave band, and meanwhile, the method is convenient for switching each wave band, and can be applied to MIMO channel simulation of various scenes.
Fig. 1 is a block diagram of a channel simulator, each channel having a receive path (RX) and a transmit path (TX), the receive path passing a received signal into an analog-to-digital converter (ADC) for processing, the digital-to-analog converter (DAC) outputting a signal to the transmit path, and finally the receive path and the transmit path being tied to a port input or output. Each channel comprises a transceiver, and finally the receiving path collects the received signals to the ADC, and the DAC generates signals to the transmitting path. When the base station and the terminal are connected to different ports respectively, the simulator can simulate the uplink communication and the downlink communication of the base station and the terminal at the same time.
Fig. 2 is a block diagram of a MIMO low-frequency wideband transceiver circuit, which is a circuit block diagram of one channel in a MIMO simulator. The signal is input or output at a receiving and transmitting end (TRX), the received signal is finally sent to an ADC, the DAC outputs the signal to a transmitting circuit at the same time, the receiving circuit and the transmitting circuit are connected through a power divider, the power divider gathers the received signal and the transmitting signal on a path, the isolation degree of the power divider is 20dB, and the isolation of the received signal and the transmitting signal is ensured.
The invention provides a low-frequency broadband transceiver circuit in a MIMO simulator, which mainly comprises a receiving circuit and a transmitting circuit. The receiving circuit and the transmitting circuit share a radio frequency interface, and transmit-receive signals are combined through the power divider.
The receiving circuit consists of a radio frequency switch, an operational amplifier, a filter and a numerical control attenuator, wherein the radio frequency switch can select a signal passing amplifying passage or a direct passage, the operational amplifier ensures the amplification of signals of 3 kHz-500 MHz, the filter filters out-of-band strays, the numerical control attenuator not only has a large dynamic attenuation range, but also has small attenuation steps, and the power precision can be controlled. And finally converting the power signal with a certain range into a power range which can be processed by the ADC.
The radio frequency switch and the operational amplifier form an amplifying and direct-connection passage, whether the amplifying or the direct-connection passage is selected according to the power of the signal, and three groups of switch amplifying circuits are added for ensuring the gain of the whole circuit.
The circuit diagram of the operational amplifier is shown in fig. 3, is designed into an inverse amplification mode, has better anti-interference capability, and meanwhile, the gain bandwidth product (GBW) of the operational amplifier is 8GHz, so that the amplification gain requirement of a 500MHz signal can be met. In fig. 3, the input/output of the operational amplifier is 50Ω impedance, so RG// RT is 50Ω, r1=r2=50Ω, and RF/rg=g is the amplification factor.
The filter is a low-pass filter, and is mainly used for filtering and inhibiting clutter signals such as harmonic waves and spurious signals out of the 500MHz band and preventing interference with useful signals. Since the amplifiers themselves also bring about harmonics, a filter is added after each amplifier.
The numerical control attenuator has a large dynamic attenuation range of 31.5dB, and the attenuation step is 0.5dB, so that the accuracy of the power can be controlled, and the linear change of the power is realized.
The transmitting circuit is composed of a filter, a radio frequency switch, an operational amplifier, a numerical control attenuator and a 20dB numerical control attenuator, wherein the radio frequency switch selects amplification or direct connection of signals, the filter filters out-of-band spurious, the numerical control attenuator has a large dynamic attenuation range, the power precision of the signals can be controlled, the 20dB numerical control attenuator carries out large-amplitude attenuation or non-attenuation on the signals, and finally, signals with a certain power of 3 kHz-500 MHz are output.
The filter is a low-pass filter, has the same function as a receiving circuit, mainly filters and suppresses noise signals such as harmonic waves and spurious signals out of the 500MHz band, and is also arranged behind the amplifier.
The radio frequency switch and the operational amplifier form an amplifying and pass-through passage, and the amplifying pass-through passage can be selected according to the power of the signal.
The numerical control attenuator has a large dynamic attenuation range of 31.5dB, and can realize linear change of signal power.
The 20dB digital control attenuator has only two states of 0dB and 20dB attenuation, realizes high-power attenuation of signals, and provides guarantee for outputting small signals.
The operational amplifier is in an inverse amplification mode, can amplify a 500MHz broadband signal, has a gain bandwidth product (GBW) of 8GHz, and can meet the amplification gain requirement of the 500MHz signal.
Through the technical scheme, the large-bandwidth coverage of 3 kHz-500 MHz can be realized, the input and output of the receiving and transmitting circuit are the same port, the convenience is provided for the simulation of the channel, the controllable combination of amplification and attenuation is arranged in the circuit, and the large dynamic range can be achieved through calibration and proper collocation.
In the invention, the frequency range of the low-frequency broadband signal is 3 kHz-500 MHz, the dynamic range of the power of the received signal is-50 dBm to +20dBm, when-50 dBm small signal is input, the gain of the operational amplifier is about 20dB, the input power required by the ADC is about 0dBm, the three-way switch is amplified and cut into the amplifying passage, the attenuation of the passage is subtracted, and the digital control attenuator is properly controlled, so that the power of the signal reaching the ADC meets the requirement. When +20dBm large signal is input, three-way switch amplification is switched to a through passage, and then the numerical control attenuator is properly controlled, so that the input power requirement of the ADC can be met. When signals are input between-50 dBm and +20dBm, the signals can meet the ADC requirement through the switching of three groups of switch amplification and the fine adjustment of the numerical control attenuator. These processes may be accomplished by calibration.
The dynamic range of the power of the transmitting signal is-120 dBm to-10 dBm, the power output by the DAC is about-5 dBm, when a small signal of-120 dBm needs to be output, the switch amplifying group is cut into a through passage, four 20dB numerical control attenuators are cut into 20dB attenuation, the numerical control attenuators are properly adjusted, the attenuation of the passage is added, the transmitting passage can reach the attenuation of-115 dB, meanwhile, the isolation and shielding on the passage are also noted when the small signal is output, and the leakage of the signal is prevented. When a small-10 dBm signal needs to be output, the switch amplification group is cut into an amplification passage, four 20dB numerical control attenuators are all cut into 0dB attenuation, the numerical control attenuators are properly adjusted, and the attenuation of the passage is added, so that the output of the-10 dBm signal can be realized. When the signal output is between-120 dBm and-10 dBm, the signal output can be realized through calibration.
By the method, a frequency range of 3 kHz-500 MHz can be realized, signals of-50 dBm to +20dBm are input, signals of a dynamic range of-120 dBm to-10 dBm are output, the frequency coverage range is large at low frequency, the bandwidth is high, the power dynamic range is large, and the method is suitable for simulation of MIMO channels. Meanwhile, the circuit can independently form a module, and can expand a low-frequency band of the MIMO channel simulator with the frequency of more than 500MHz, so that the low-frequency simulation capability of the simulator is improved.
The MIMO low-frequency broadband receiving and transmitting circuit structure has wide frequency range coverage, the range is 3 kHz-500 MHz, and the ultra-long wave to ultra-short wave frequency range is covered; the bandwidth of the signal reaches 500MHz, thus providing possibility for MIMO simulation of low-frequency signals. The circuit structure integrates the transceiver circuit, and the transceiver shares one port, so that the number of external ports is reduced, the dynamic range of input and output signals is large, and signal simulation in various power ranges is provided.
In this specification, the invention has been described with reference to specific embodiments thereof. It will be apparent that various modifications and variations can be made without departing from the spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (4)
1. The MIMO low-frequency broadband receiving and transmitting circuit structure is characterized by comprising a plurality of channels, wherein each channel comprises a receiving circuit and a transmitting circuit, the receiving circuit and the transmitting circuit are both connected with a power divider, the input end of the receiving circuit is connected with the power divider, the output end of the receiving circuit is connected with an analog-to-digital converter, the input end of the transmitting circuit is connected with a digital-to-analog converter, and the output end of the receiving circuit is connected with the power divider;
the receiving circuit comprises three groups of receiving switch amplifying circuit modules, three receiving filters and a receiving digital control attenuator, wherein the three groups of receiving switch amplifying circuit modules are identical in structure and are respectively a first receiving switch amplifying circuit module, a second receiving switch amplifying circuit module and a third receiving switch amplifying circuit module, the three receiving filters are respectively a first receiving filter, a second receiving filter and a third receiving filter, the first receiving switch amplifying circuit module, the first receiving filter, the second receiving switch amplifying circuit module, the second receiving filter, the receiving digital control attenuator, the third receiving switch amplifying circuit module and the third receiving filter are sequentially connected, the input end of the first receiving switch amplifying circuit module is connected with a power divider, the output end of the third receiving filter is connected with an analog-to-digital converter, the receiving filters are used for filtering spurious signals outside the band, and the receiving attenuator is used for controlling the accuracy of power and converting power signals in a range into power ranges supporting the processing of the analog-to-digital converter;
the switch amplifying circuit module comprises two receiving radio frequency switches and a receiving operational amplifier, wherein the two receiving radio frequency switches are respectively connected with the input end and the output end of the receiving operational amplifier, the two receiving radio frequency switches are connected, the receiving radio frequency switches are used for selecting an amplifying passage or a direct passage of a receiving signal, and the receiving operational amplifier is used for amplifying the receiving signal;
The transmitting circuit comprises a plurality of 20dB numerical control attenuators, a transmitting numerical control attenuator, a transmitting switch amplifying circuit module and a transmitting filter, wherein the plurality of 20dB numerical control attenuators, the transmitting numerical control attenuator, the transmitting switch amplifying circuit module and the transmitting filter are sequentially connected, the plurality of 20dB numerical control attenuators are connected in series, the input end of the 20dB numerical control attenuator is connected with the digital-to-analog converter, and the output end of the transmitting filter is connected with the power divider;
The transmitting switch amplifying circuit module comprises two transmitting radio frequency switches and a transmitting operational amplifier, wherein the two transmitting radio frequency switches are respectively connected with the input end and the output end of the transmitting operational amplifier, the two transmitting radio frequency switches are connected, the transmitting radio frequency switches are used for selecting an amplifying passage or a direct passage of a transmitting signal, and the transmitting operational amplifier is used for amplifying the transmitting signal.
2. The MIMO low frequency broadband transceiver circuit structure of claim 1, wherein said 20dB digitally controlled attenuator has two states, 0dB and 20dB attenuation.
3. The MIMO low-frequency broadband transceiver circuit structure of claim 1, wherein the receiving operational amplifier is an inverting amplifier and the gain bandwidth product is 8GHz.
4. The MIMO low-frequency broadband transceiving circuit structure according to claim 1, wherein a dynamic attenuation range of said reception digitally controlled attenuator is 31.5dB, and an attenuation step is 0.5dB; the dynamic attenuation range of the emission numerical control attenuator is 31.5dB, and the attenuation step is 0.5dB.
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| CN202111223020.1A CN113783583B (en) | 2021-10-20 | 2021-10-20 | MIMO low-frequency broadband transceiver circuit structure |
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| CN202111223020.1A CN113783583B (en) | 2021-10-20 | 2021-10-20 | MIMO low-frequency broadband transceiver circuit structure |
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Citations (3)
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| CN209488823U (en) * | 2019-05-06 | 2019-10-11 | 深圳市皓华网络通讯股份有限公司 | A kind of winged source distribution system of mobile communication indoor |
| CN111261985A (en) * | 2020-03-23 | 2020-06-09 | 上海创远仪器技术股份有限公司 | Miniaturized multi-channel radio frequency large dynamic attenuation circuit structure and corresponding shielding device |
| CN216016855U (en) * | 2021-10-20 | 2022-03-11 | 上海创远仪器技术股份有限公司 | MIMO low-frequency broadband transceiving circuit structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007004911A1 (en) * | 2007-01-26 | 2008-08-07 | Funkwerk Dabendorf Gmbh | Multi-part circuit arrangement for damping compensation |
| CN101944924B (en) * | 2010-09-30 | 2013-03-20 | 东南大学 | Broadband MIMO radio frequency transceiving system for next-generation wireless communication network |
| CN207819931U (en) * | 2018-02-05 | 2018-09-04 | 河北时光射频技术有限公司 | A kind of miniaturization 4x4MIMO microwave channel simulators |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209488823U (en) * | 2019-05-06 | 2019-10-11 | 深圳市皓华网络通讯股份有限公司 | A kind of winged source distribution system of mobile communication indoor |
| CN111261985A (en) * | 2020-03-23 | 2020-06-09 | 上海创远仪器技术股份有限公司 | Miniaturized multi-channel radio frequency large dynamic attenuation circuit structure and corresponding shielding device |
| CN216016855U (en) * | 2021-10-20 | 2022-03-11 | 上海创远仪器技术股份有限公司 | MIMO low-frequency broadband transceiving circuit structure |
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