CN112968710A - Multi-band radio frequency circuit - Google Patents
Multi-band radio frequency circuit Download PDFInfo
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- CN112968710A CN112968710A CN201911284978.4A CN201911284978A CN112968710A CN 112968710 A CN112968710 A CN 112968710A CN 201911284978 A CN201911284978 A CN 201911284978A CN 112968710 A CN112968710 A CN 112968710A
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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
- H04B1/005—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0053—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band
- H04B1/006—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 adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with common antenna for more than one band using switches for selecting the desired band
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/77—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for interrogation
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Abstract
The application discloses a multi-band radio frequency circuit. The circuit includes a single-pole, multi-throw switch; the multi-band transceiving antenna is connected with the first port of the single-pole multi-throw switch, the first directional coupler is connected with the second port of the single-pole multi-throw switch, and the first port of the first directional coupler is connected with the second port of the single-pole multi-throw switch; a first radio frequency circuit connected to the second port and the third port of the first directional coupler; and the second radio frequency circuit is connected with the third port and the fourth port of the single-pole multi-throw switch. The multi-band radio frequency circuit has the characteristics of simple structure and high sensitivity, and reduces the hardware cost.
Description
Technical Field
The application relates to the technical field of Internet of things, in particular to a multi-band radio frequency circuit.
Background
An Electronic Identification (Electronic Identification Of The Motorvehicle, ERI), also called an Electronic Identification card Of The automobile, a digital standard information source Of The automobile and an Electronic license plate, namely, information such as a license plate number is stored in a Radio Frequency tag, so that The Identification and monitoring Of The automobile can be automatically completed without contact or stop, and The method is an extension Of The passive Radio Frequency Identification (RFID) based on The internet Of things in The field Of intelligent transportation.
An Electronic Toll Collection (ETC) system for a highway is an intelligent transportation Electronic system which takes high and new technologies such as modern communication technology, Electronic technology, automatic control technology, computer and network technology as the leading part and realizes automatic Toll collection of vehicles without stopping vehicles. The system automatically completes the charging processing process under the condition of not needing a driver to park and other toll collectors to operate through special short-range communication between a Road Side Unit (RSU) and an On Board Unit (OBU).
The above are two RFID standards existing in the road traffic system in our country. The automobile electronic identification technology works at Ultra High Frequency (UHF), the highway electronic toll collection system works at a C wave band, wherein the UHF refers to radio waves with the Frequency of 300-3000 MHz and the wavelength of 1 m-1 dm, the C wave band refers to radio Frequency signals with the Frequency of 4.0-8.0GHz, and the C wave band can be used as a Frequency band of downlink transmission signals of a communication satellite.
However, the inventor found that in a scenario where a UHF radio frequency reader/writer and a C-band radio frequency reader/writer can be used simultaneously, two types of reader/writers need to be installed, which increases hardware cost.
Disclosure of Invention
The embodiment of the application provides a multi-band radio frequency circuit, which solves the problems in the prior art and reduces the hardware cost.
In a first aspect, a multiband radio frequency circuit is provided, which may include:
a single-pole, multi-throw switch;
the multi-band transceiving antenna is connected with the first port of the single-pole multi-throw switch and is used for receiving radio frequency signals transmitted by a radio frequency tag and sending out radio frequency signals, and the radio frequency signals comprise first frequency band radio frequency signals and second frequency band radio frequency signals;
the second port of the single-pole multi-throw switch is connected with the first port of the first directional coupler and is used for transmitting a first frequency band radio frequency signal to the transceiving antenna through the single-pole multi-throw switch and receiving the first frequency band radio frequency signal transmitted by the radio frequency tag and received by the transceiving antenna through the single-pole multi-throw switch;
the first radio frequency circuit is connected with the second port and the third port of the first directional coupler and is used for generating a first frequency band radio frequency signal, transmitting the generated first frequency band radio frequency signal to the transceiving antenna and receiving the first frequency band radio frequency signal transmitted by the radio frequency tag and received by the transceiving antenna;
and the second radio frequency circuit is connected with the third port and the fourth port of the single-pole multi-throw switch and is used for generating a second frequency band radio frequency signal, transmitting the generated second frequency band radio frequency signal to the transceiving antenna and receiving the second frequency band radio frequency signal transmitted by the radio frequency tag and received by the transceiving antenna.
In an alternative implementation, the first radio frequency circuit includes a first signal generator, a first transmit path connection, a first receive path, and a first signal receiver;
wherein the first signal generator is connected to a first end of the first transmission path, and a second end of the first transmission path is connected to a second port of the first directional coupler; the first signal receiver is connected with a first end of the first receiving path, and a second end of the first receiving path is connected with a third port of the first directional coupler;
the second radio frequency circuit comprises a second signal generator, a second sending path connection, a second receiving path and a second signal receiver;
wherein the second signal generator is connected with a first end of the second transmitting path, and a second end of the second transmitting path is connected with a third port of the single-pole multi-throw switch; the second signal receiver is connected with a first end of the second receiving path, and a second end of the second receiving path is connected with a fourth port of the single-pole multi-throw switch.
In an alternative implementation, the first signal generator is configured to generate a first frequency band radio frequency signal;
the first transmitting path is configured to transmit the generated first frequency band radio frequency signal to the transceiving antenna through the first directional coupler;
the first receiving channel is used for transmitting a first frequency band radio frequency signal transmitted by the radio frequency tag and received by the transceiving antenna;
the first signal receiver is used for receiving a first frequency band radio frequency signal transmitted by the radio frequency tag;
the second signal generator is used for generating a second frequency band radio frequency signal;
the second transmitting path is used for transmitting the generated second frequency band radio frequency signal to the transceiving antenna through the single-pole multi-throw switch;
the second receiving path is used for transmitting the radio-frequency signal of the second frequency band transmitted by the radio-frequency tag and received by the transceiving antenna;
and the second signal receiver is used for receiving the second frequency band radio frequency signal transmitted by the radio frequency tag.
In an alternative implementation, the first radio frequency circuit further comprises a signal cancellation path, a cancellation signal generator, and a second directional coupler;
a first end of the second directional coupler is connected with a third port of the first directional coupler, a second end of the second directional coupler is connected with a second end of the first receiving path, a third end of the second directional coupler is connected with a first end of the signal cancellation path, and a second end of the signal cancellation path is connected with the cancellation signal generator;
the cancellation signal generator is used for outputting a cancellation signal;
the signal cancellation path is used for transmitting the generated cancellation signal to the second directional coupler;
the second directional coupler is configured to couple the cancellation signal into the first receiving path, so that a spatially coupled interference signal in the first frequency band radio frequency signal transmitted by the radio frequency tag through the first receiving path and the cancellation signal perform signal cancellation to obtain a first frequency band radio frequency signal from which the interference signal is cancelled, where a phase difference between a phase of the cancellation signal and the spatially coupled interference signal is 180 °, and an amplitude of the cancellation signal is the same as an amplitude of the spatially coupled interference signal.
In an alternative implementation, the signal cancellation path includes a radio frequency signal amplifier in a first frequency band;
the input end of the radio frequency signal amplifier is connected with the counteracting signal generator, and the output end of the radio frequency signal amplifier is connected with the third end of the second directional coupler.
In an alternative implementation, the cancellation signal generator includes a cancellation modulator, a cancellation local oscillator, and a cancellation digital-to-analog converter;
the offset modulator is respectively connected with the offset local oscillator and the offset digital-to-analog converter, and is configured to receive an offset carrier signal output by the offset local oscillator and an offset control signal output by the offset digital-to-analog converter, perform signal modulation on the offset carrier signal and the offset control signal, and output an offset signal;
the first signal receiver comprises a first modulator, a first local oscillator and a first analog-to-digital converter;
the first modulator is connected to the first local oscillator and the first analog-to-digital converter, and is configured to receive a first carrier signal output by the first local oscillator and a first frequency band radio frequency signal transmitted by a radio frequency tag and transmitted by a first end of the first receiving path, perform signal modulation on the first carrier signal and the first frequency band radio frequency signal transmitted by the radio frequency tag, and output the first carrier signal and the first frequency band radio frequency signal to the first analog-to-digital converter;
the frequency of the first carrier signal is the same as the frequency of the cancellation carrier signal.
In an alternative implementation, the circuit further comprises a first single pole double throw switch and a second single pole double throw switch;
when the first signal generator and the second signal generator are the same target signal generator and the first signal receiver and the second signal receiver are the same target signal receiver, a first end of the first single-pole double-throw switch is connected with the target signal generator, a second end of the first single-pole double-throw switch is connected with a first end of the first sending path, and a third end of the first single-pole double-throw switch is connected with a first end of the second sending path;
the first end of the second single-pole double-throw switch is connected with a target signal receiver, the second end of the second single-pole double-throw switch is connected with the first end of the first receiving path, and the third end of the second single-pole double-throw switch is connected with the first end of the second receiving path.
In an alternative implementation, the first transmit path includes a first band pass filter, a first power amplifier, and a first low pass filter;
the input end of the first band-pass filter is connected with the first signal generator, the output end of the first band-pass filter is connected with the input end of the first power amplifier, the output end of the first power amplifier is connected with the input end of the first low-pass filter, and the output end of the first low-pass filter is connected with the second port of the first directional coupler;
the first receiving path comprises a second band-pass filter, a second low-noise amplifier and a second low-pass filter;
the input end of the second band-pass filter is connected with the third port of the first directional coupler, the output end of the second band-pass filter is connected with the input end of the second low-noise amplifier, the output end of the second low-noise amplifier is connected with the input end of the second low-pass filter, and the output end of the second low-pass filter is connected with the first signal receiver.
In an alternative implementation, the second transmit path includes a third band pass filter, a third power amplifier, and a third low pass filter;
the input end of the third band-pass filter is connected with the second signal generator, the output end of the third band-pass filter is connected with the input end of the third power amplifier, the output end of the third power amplifier is connected with the input end of the third low-pass filter, and the output end of the third low-pass filter is connected with the third port of the single-pole multi-throw switch;
the second receive path comprises a fourth band-pass filter, a fourth low noise amplifier, and a fourth low-pass filter;
the input end of the fourth band-pass filter is connected with the fourth port of the single-pole multi-throw switch, the output end of the fourth band-pass filter is connected with the input end of the fourth low-noise amplifier, the output end of the fourth low-noise amplifier is connected with the input end of the fourth low-pass filter, and the output end of the fourth low-pass filter is connected with the second signal receiver.
In an alternative implementation, the first band radio frequency signal is an ultra high frequency radio wave UHF, and the second band radio frequency signal is a C band.
In a second aspect, a terminal device is provided, where the terminal device is the circuit of any one of the first aspect.
The multi-band radio frequency circuit provided by the embodiment of the invention comprises a single-pole multi-throw switch; the multi-band transceiving antenna is connected with the first port of the single-pole multi-throw switch and is used for receiving radio frequency signals transmitted by the radio frequency tag and sending out the radio frequency signals, and the radio frequency signals comprise first frequency band radio frequency signals and second frequency band radio frequency signals; the second port of the single-pole multi-throw switch is connected with the first port of the first directional coupler and is used for transmitting a first frequency band radio frequency signal to the receiving and transmitting antenna through the single-pole multi-throw switch and receiving the first frequency band radio frequency signal transmitted by the radio frequency tag received by the receiving and transmitting antenna through the single-pole multi-throw switch; the first radio frequency circuit is connected with the second port and the third port of the first directional coupler and used for generating a first frequency band radio frequency signal, transmitting the generated first frequency band radio frequency signal to the transceiving antenna and receiving the first frequency band radio frequency signal transmitted by the radio frequency tag received by the transceiving antenna; and the second radio frequency circuit is connected with the third port and the fourth port of the single-pole multi-throw switch and used for generating a second frequency band radio frequency signal, transmitting the generated second frequency band radio frequency signal to the transceiving antenna and receiving the second frequency band radio frequency signal transmitted by the radio frequency tag received by the transceiving antenna. Compared with the radio frequency circuit with two frequency bands in the prior art, the multi-band radio frequency circuit has the characteristics of simple structure and high sensitivity, and reduces the hardware cost.
Drawings
FIG. 1 is a schematic structural diagram of a multiband RF circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another multiband RF circuit according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a multi-band RF circuit according to another embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a multi-band RF circuit according to another embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a multi-band RF circuit according to another embodiment of the present invention;
FIG. 6 is a schematic structural diagram of a multi-band RF circuit according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a multi-band rf circuit according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without any creative effort belong to the protection scope of the present application.
The multi-band radio frequency circuit provided by the embodiment of the invention can be applied to the front end of a radio frequency reader-writer to receive and send video signals. The radio frequency reader may be installed in a terminal device, and the terminal device may be a User Equipment (UE) such as a Mobile phone, a smart phone, a notebook computer, a digital broadcast receiver, a Personal Digital Assistant (PDA), a tablet computer (PAD), a handheld device, a vehicle-mounted device, a wearable device, a computing device, or other processing devices connected to a wireless modem, a Mobile Station (MS), or the like.
Fig. 1 is a schematic structural diagram of a multiband radio frequency circuit according to an embodiment of the present invention. As shown in fig. 1, the circuit may include:
a single pole, multiple throw switch 110, such as a single pole, three throw switch;
the multi-band transceiving antenna 120 is connected with the first port of the single-pole multi-throw switch 110 and is used for receiving radio frequency signals transmitted by the radio frequency tag and sending out radio frequency signals, and the radio frequency signals comprise first frequency band radio frequency signals and second frequency band radio frequency signals; the frequency band of the first frequency band radio frequency signal is different from the frequency band of the second frequency band radio frequency signal.
The second port of the single-pole multi-throw switch 110 is connected to the first port of the first directional coupler 130, and is configured to transmit a radio frequency signal of a first frequency band to the transceiver antenna 120 through the single-pole multi-throw switch 110, and receive the radio frequency signal of the first frequency band transmitted by the radio frequency tag received by the transceiver antenna 120 through the single-pole multi-throw switch 110;
the first radio frequency circuit 140 is connected to the second port and the third port of the first directional coupler 130, and configured to generate a first frequency band radio frequency signal, transmit the generated first frequency band radio frequency signal to the transceiving antenna 120, and receive the first frequency band radio frequency signal transmitted by the radio frequency tag and received by the transceiving antenna 120;
the second rf circuit 150, connected to the third port and the fourth port of the single-pole-three-throw switch 110, is configured to generate a second frequency band rf signal, transmit the generated second frequency band rf signal to the transceiving antenna 120, and receive the second frequency band rf signal transmitted by the rf tag received by the transceiving antenna 120.
The multi-band radio frequency circuit can be switched between the first radio frequency circuit and the second radio frequency circuit through the single-pole multi-throw switch, and the frequency band of the radio frequency signal of the first frequency band is different from that of the radio frequency signal of the second frequency band, so that the multi-band radio frequency circuit realizes the multi-band radio frequency circuit of the double frequency bands.
It can be understood that the multi-band rf circuit can be realized by connecting rf circuits of other frequency bands to other idle ports of the single-pole multi-throw switch.
Taking the single-pole-three-throw switch as an example, as shown in fig. 2, the first rf circuit 140 may include a first signal generator 141, a first transmitting path 142, a first receiving path 143, and a first signal receiver 144;
the second radio frequency circuit 150 may include a second signal generator 151, a second transmit path connection 152, a second receive path 153, and a second signal receiver 154;
(1) in the first rf circuit 140, the first signal generator 141 is connected to a first end of the first transmission path 142, and a second end of the first transmission path 142 is connected to a second port of the first directional coupler 130; the first signal receiver 141 is connected to a first end of the first receiving path 143, and a second end of the first receiving path 143 is connected to a third port of the first directional coupler 130.
The first signal generator 141 is configured to generate a first frequency band radio frequency signal;
a first transmission path 142, configured to transmit the generated first frequency band radio frequency signal to the transceiving antenna 120 through the first directional coupler 130;
a first receiving path 143, configured to transmit a first frequency band radio frequency signal transmitted by the radio frequency tag and received by the transceiving antenna 120;
a first signal receiver 144, configured to receive a first frequency band radio frequency signal transmitted by the radio frequency tag;
(2) in the second rf circuit 150, the second signal generator 151 is connected to a first end of a second transmission path 152, and a second end of the second transmission path 152 is connected to a third port of the single-pole-three-throw switch 110; the second signal receiver 154 is connected to a first end of the second receiving path 153, and a second end of the second receiving path 153 is connected to the fourth port of the single pole, three throw switch 110.
Wherein, the second signal generator 151 is configured to generate a second frequency band radio frequency signal;
a second transmitting path 152, configured to transmit the generated second frequency band radio frequency signal to the transceiving antenna 120 through the single-pole-three-throw switch 110;
a second receiving path 153, configured to transmit a radio frequency signal of a second frequency band, which is transmitted by the radio frequency tag and received by the transceiving antenna 120;
and a second signal receiver 154 for receiving the second frequency band rf signal transmitted by the rf tag.
As shown in fig. 3, the first rf circuit and the second rf circuit may specifically include:
(1) in the first radio frequency circuit:
the first transmit path 142 may include a first band pass filter, a first power amplifier, and a first low pass filter;
wherein, the input end of the first band-pass filter is connected with the first signal generator, the output end of the first band-pass filter is connected with the input end of the first power amplifier, the output end of the first power amplifier is connected with the input end of the first low-pass filter, and the output end of the first low-pass filter is connected with the second port of the first directional coupler 130;
the first receiving path 143 may include a second band pass filter, a second low noise amplifier, and a second low pass filter;
the input end of the second band-pass filter is connected with the third port of the first directional coupler, the output end of the second band-pass filter is connected with the input end of the second low-noise amplifier, the output end of the second low-noise amplifier is connected with the input end of the second low-pass filter, and the output end of the second low-pass filter is connected with the first signal receiver.
The first signal receiver 144 may include a first adjustor, a first analog-to-digital converter, and a first local oscillator.
The first modulator is connected with the first local oscillator and the first analog-to-digital converter respectively, and is used for receiving a first carrier signal output by the first local oscillator and a first frequency band radio frequency signal transmitted by a radio frequency tag transmitted by a first end of the first receiving channel, performing signal modulation on the first carrier signal and the first frequency band radio frequency signal transmitted by the radio frequency tag, and outputting the first carrier signal and the first frequency band radio frequency signal to the first analog-to-digital converter.
The first signal generator 141 may include a second adjustor, a first digital-to-analog converter, and a second local oscillator.
The second regulator is connected to the second local oscillator and the first digital-to-analog converter, and is configured to receive a second carrier signal output by the second local oscillator and a baseband signal output by the first digital-to-analog converter, perform signal modulation on the second carrier signal and the transmitted baseband signal, and output the second carrier signal and the transmitted baseband signal to the first end of the first transmission path.
(2) In the second radio frequency circuit:
the second transmit path 152 may include a third band pass filter, a third power amplifier, and a third low pass filter;
the input end of the third band-pass filter is connected with the second signal generator, the output end of the third band-pass filter is connected with the input end of the third power amplifier, the output end of the third power amplifier is connected with the input end of the third low-pass filter, and the output end of the third low-pass filter is connected with the third port of the single-pole three-throw switch.
The second receiving path 153 may include a fourth band pass filter, a fourth low noise amplifier, and a fourth low pass filter;
the input end of the fourth band-pass filter is connected with the fourth port of the single-pole three-throw switch, the output end of the fourth band-pass filter is connected with the input end of the fourth low-noise amplifier, the output end of the fourth low-noise amplifier is connected with the input end of the fourth low-pass filter, and the output end of the fourth low-pass filter is connected with the second signal receiver.
The second signal generator 151 may include a third adjustor, a second digital-to-analog converter, and a third local oscillator.
The third regulator is connected to the third local oscillator and the second digital-to-analog converter, and is configured to receive a third carrier signal output by the third local oscillator and a baseband signal output by the second digital-to-analog converter, perform signal modulation on the third carrier signal and the transmitted baseband signal, and output the third carrier signal and the transmitted baseband signal to the first end of the second transmission path.
The second signal receiver 154 may include a fourth regulator, a second analog-to-digital converter, and a fourth local oscillator.
The fourth modulator is connected with the fourth local oscillator and the second analog-to-digital converter respectively, and is configured to receive a fourth carrier signal output by the fourth local oscillator and a second frequency band radio frequency signal transmitted by the radio frequency tag and transmitted by the first end of the second receiving path, perform signal modulation on the fourth carrier signal and the second frequency band radio frequency signal transmitted by the radio frequency tag, and output the modulated fourth carrier signal and the second frequency band radio frequency signal to the second analog-to-digital converter.
In order to further simplify the connection manner of the circuit and reduce the hardware cost, the first signal generator and the second signal generator may be the same target signal generator, and the first signal receiver and the second signal receiver may be the same target signal receiver, in this case, the multiband rf circuit may further include a first single-pole double-throw switch 160 and a second single-pole double-throw switch 170, as shown in fig. 4.
The first end of the first single-pole double-throw switch is connected with the target signal generator, the second end of the first single-pole double-throw switch is connected with the first end of the first sending channel, and the third end of the first single-pole double-throw switch is connected with the first end of the second sending channel;
the first end of the second single-pole double-throw switch is connected with the target signal receiver, the second end of the second single-pole double-throw switch is connected with the first end of the first receiving path, and the third end of the second single-pole double-throw switch is connected with the first end of the second receiving path.
Optionally, in a case that the first signal generator and the second signal generator are the same target signal generator, and the first signal receiver and the second signal receiver are the same target signal receiver:
the input of the first bandpass filter in the first transmit path 142 is connected to the target signal generator through the second terminal of the first single pole double throw switch.
The output terminal of the second low pass filter in the first receiving path 143 is connected to the target signal receiver through the second terminal of the second single pole double throw switch.
The input of the third bandpass filter in the second transmit path 152 may also be connected to the target signal generator through the third terminal of the first single pole double throw switch.
The output terminal of the fourth low pass filter in the first receiving path 153 may also be connected to the target signal receiver through the third terminal of the second single pole double throw switch.
It should be noted that, in order to further simplify the circuit structure, the first local oscillator, the second local oscillator, the third local oscillator, and the fourth local oscillator may be the same target local oscillator, and the frequency of the carrier signal output by the target local oscillator may be adjusted according to an actual situation.
Optionally, when the first frequency band rf signal is an UHF radio wave, the first rf circuit 140 may further include a signal cancellation path 145, a cancellation signal generator 146 and a second directional coupler 147, as shown in fig. 5.
A first end of the second directional coupler 160 is connected to the third port of the first directional coupler 130, a second end of the second directional coupler 160 and a second end of the first receiving path 143 are connected to a third end of the second directional coupler 160 and a first end of the signal cancellation path 145, and a second end of the signal cancellation path 145 is connected to the cancellation signal generator 146;
the cancellation signal generator 146 is configured to output a cancellation signal;
a signal cancellation path 145 for transmitting the generated cancellation signal to the second directional coupler;
the second directional coupler 147 is configured to couple the cancellation signal into the first receiving path, so that the interference signal spatially coupled in the first frequency band radio frequency signal transmitted by the radio frequency tag through the first receiving path and the cancellation signal perform signal cancellation, and the obtained first frequency band radio frequency signal from which the interference signal is eliminated is obtained.
The phase of the cancellation signal is 180 ° out of phase with the spatially coupled interference signal, and the amplitude of the cancellation signal is the same as the amplitude of the spatially coupled interference signal.
Alternatively, the signal cancellation path 145 may include a radio frequency signal amplifier in a first frequency band;
the input end of the radio frequency signal amplifier is connected with the offset signal generator, and the output end of the radio frequency signal amplifier is connected with the third end of the second directional coupler.
Optionally, the cancellation signal generator 146 may include a cancellation modulator, a cancellation local oscillator, and a cancellation digital-to-analog converter.
The offset modulator is respectively connected with the offset local oscillator and the offset digital-to-analog converter and used for receiving an offset carrier signal output by the offset local oscillator and an offset control signal output by the offset digital-to-analog converter, and outputting an offset signal after signal modulation is carried out on the offset carrier signal and the offset control signal;
the frequency of the first carrier signal in the first signal receiver is the same as the frequency of the cancellation carrier signal.
It should be noted that, with reference to fig. 4 and fig. 5, the video circuit may also be as shown in fig. 6, and a specific connection manner of the video circuit may refer to the circuit connection manner in fig. 4 and fig. 5, which is not described herein again in this embodiment of the present invention.
In one example, the first signal generator and the second signal generator are the same target signal generator, the first signal receiver and the second signal receiver are the same target signal receiver, and the first band rf signal is the UHF radio wave, and the second band rf signal is the C band, for example, the multiband rf circuit is shown in fig. 7.
When the multi-band radio frequency circuit works in the UHF mode: the 1-2 single pole 3 throw switch is opened to port 1 and the UHF transmit-receive path is connected through the 1-3 directional coupler 1.
When a multi-band radio frequency circuit sends data to a radio frequency tag, a 1-13 digital-to-analog converter 1 generates a baseband signal, the baseband signal and a local oscillator signal generated by a 1-14 local oscillator 1 are input into a 1-12 modulator 1, and a 1-12 modulated radio frequency signal is output to a 1-11 single-pole double-throw switch 1. The single-pole double-throw switch is turned to the end 1, the radio frequency signal passes through a 1-9UHF band-pass filter to filter out-of-band stray, enters a 1-7UHF power amplifier and then passes through a 1-5UHF low-pass filter to suppress harmonic waves. Then the signals are output to a 1-1UHF and C band dual-frequency receiving and transmitting antenna through a 1-3 directional coupler 1 and a 1-2 single-pole 3 throw switch to be radiated.
When a multi-band radio frequency circuit receives a radio frequency signal transmitted by a radio frequency tag, the received signal enters a 1-21UHF band-pass filter for filtering out-of-band interference through a 1-2 single-pole 3-throw switch, a 1-3 directional coupler 1 and a 1-4 directional coupler 2, then enters a 1-23UHF low-noise amplifier, then enters a 1-16 demodulator through a 1-25UHF low-pass filter and a 1-19 single-pole double-throw switch 1 to demodulate a baseband signal, and then the baseband signal is output to a 1-15 analog-to-digital converter.
The 1-18 local oscillator 2 generates a carrier signal with the same frequency as the 1-14 local oscillator 1, and the carrier signal is output to the 1-27 modulator 2 together with a control signal output by the 1-17 digital-to-analog converter. The output signal of the 1-27 modulator 2 enters a 1-20UHF amplifier for amplification, and the signal with the same amplitude and the reverse amplitude of the carrier wave received in a receiving circuit is output and combined into the receiving circuit through the 1-4 directional coupler 2 for carrier wave elimination.
When the multi-band radio frequency circuit works in a C-band mode: when the 1-2 single-pole 3-throw switch is opened to the port 2, the multi-band radio frequency circuit is in a transmitting state.
At this time, the 1-13D/A converter outputs baseband signals, and the baseband signals and local oscillation signals generated by the 1-14 local oscillation 1 are input into the 1-12 modulator 1, and the 1-12 modulator outputs modulated radio frequency signals to the 1-11 single-pole double-throw switch 1. The single-pole double-throw switch is turned to the 2 end, the radio-frequency signal passes through a 1-10C waveband band-pass filter to filter out-of-band stray, enters a 1-8C waveband power amplifier, and then passes through a 1-5C waveband low-pass filter to suppress harmonic waves. And the signal is output to a 1-1UHF & C waveband dual-band transmitting-receiving antenna through a 1-2 single-pole 3-throw switch.
When the 1-2 single-pole 3-throw switch is opened to the port 3, the multi-band radio frequency circuit is in a receiving state, a received signal enters a 1-22C band-pass filter through the 1-2 single-pole 3-throw switch to filter out-of-band interference, then enters a 1-22C band low noise amplifier, then enters a 1-16 demodulator through a 1-26C band low-pass filter and a 1-19 single-pole double-throw switch to demodulate a baseband signal, and the baseband signal is output to a 1-15 analog-to-digital converter.
The multi-band radio frequency circuit provided by the embodiment of the invention comprises a single-pole multi-throw switch; the multi-band transceiving antenna is connected with the first port of the single-pole multi-throw switch and is used for receiving radio frequency signals transmitted by the radio frequency tag and sending out the radio frequency signals, and the radio frequency signals comprise first frequency band radio frequency signals and second frequency band radio frequency signals; the second port of the single-pole multi-throw switch is connected with the first port of the first directional coupler and is used for transmitting a first frequency band radio frequency signal to the receiving and transmitting antenna through the single-pole multi-throw switch and receiving the first frequency band radio frequency signal transmitted by the radio frequency tag received by the receiving and transmitting antenna through the single-pole multi-throw switch; the first radio frequency circuit is connected with the second port and the third port of the first directional coupler and used for generating a first frequency band radio frequency signal, transmitting the generated first frequency band radio frequency signal to the transceiving antenna and receiving the first frequency band radio frequency signal transmitted by the radio frequency tag received by the transceiving antenna; and the second radio frequency circuit is connected with the third port and the fourth port of the single-pole multi-throw switch and used for generating a second frequency band radio frequency signal, transmitting the generated second frequency band radio frequency signal to the transceiving antenna and receiving the second frequency band radio frequency signal transmitted by the radio frequency tag received by the transceiving antenna. Compared with the radio frequency circuit with two frequency bands in the prior art, the multi-band radio frequency circuit has the characteristics of simple structure and high sensitivity, and reduces the hardware cost.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the true scope of the embodiments of the present application.
It is apparent that those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the embodiments of the present application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the embodiments of the present application and their equivalents, the embodiments of the present application are also intended to include such modifications and variations.
Claims (11)
1. A multi-band radio frequency circuit, said circuit comprising:
a single-pole, multi-throw switch;
the multi-band transceiving antenna is connected with the first port of the single-pole multi-throw switch and is used for receiving radio frequency signals transmitted by a radio frequency tag and sending out radio frequency signals, and the radio frequency signals comprise first frequency band radio frequency signals and second frequency band radio frequency signals;
the second port of the single-pole multi-throw switch is connected with the first port of the first directional coupler and is used for transmitting a first frequency band radio frequency signal to the transceiving antenna through the single-pole multi-throw switch and receiving the first frequency band radio frequency signal transmitted by the radio frequency tag and received by the transceiving antenna through the single-pole multi-throw switch;
the first radio frequency circuit is connected with the second port and the third port of the first directional coupler and is used for generating a first frequency band radio frequency signal, transmitting the generated first frequency band radio frequency signal to the transceiving antenna and receiving the first frequency band radio frequency signal transmitted by the radio frequency tag and received by the transceiving antenna;
and the second radio frequency circuit is connected with the third port and the fourth port of the single-pole multi-throw switch and is used for generating a second frequency band radio frequency signal, transmitting the generated second frequency band radio frequency signal to the transceiving antenna and receiving the second frequency band radio frequency signal transmitted by the radio frequency tag and received by the transceiving antenna.
2. The circuit of claim 1,
the first radio frequency circuit comprises a first signal generator, a first transmission path connection, a first receiving path and a first signal receiver;
wherein the first signal generator is connected to a first end of the first transmission path, and a second end of the first transmission path is connected to a second port of the first directional coupler; the first signal receiver is connected with a first end of the first receiving path, and a second end of the first receiving path is connected with a third port of the first directional coupler;
the second radio frequency circuit comprises a second signal generator, a second sending path connection, a second receiving path and a second signal receiver;
wherein the second signal generator is connected with a first end of the second transmitting path, and a second end of the second transmitting path is connected with a third port of the single-pole multi-throw switch; the second signal receiver is connected with a first end of the second receiving path, and a second end of the second receiving path is connected with a fourth port of the single-pole multi-throw switch.
3. The circuit of claim 2,
the first signal generator is used for generating a first frequency band radio frequency signal;
the first transmitting path is configured to transmit the generated first frequency band radio frequency signal to the transceiving antenna through the first directional coupler;
the first receiving channel is used for transmitting a first frequency band radio frequency signal transmitted by the radio frequency tag and received by the transceiving antenna;
the first signal receiver is used for receiving a first frequency band radio frequency signal transmitted by the radio frequency tag;
the second signal generator is used for generating a second frequency band radio frequency signal;
the second transmitting path is used for transmitting the generated second frequency band radio frequency signal to the transceiving antenna through the single-pole multi-throw switch;
the second receiving path is used for transmitting the radio-frequency signal of the second frequency band transmitted by the radio-frequency tag and received by the transceiving antenna;
and the second signal receiver is used for receiving the second frequency band radio frequency signal transmitted by the radio frequency tag.
4. The circuit of claim 2,
the first radio frequency circuit further comprises a signal cancellation path, a cancellation signal generator and a second directional coupler;
a first end of the second directional coupler is connected with a third port of the first directional coupler, a second end of the second directional coupler is connected with a second end of the first receiving path, a third end of the second directional coupler is connected with a first end of the signal cancellation path, and a second end of the signal cancellation path is connected with the cancellation signal generator;
the cancellation signal generator is used for outputting a cancellation signal;
the signal cancellation path is used for transmitting the generated cancellation signal to the second directional coupler;
the second directional coupler is configured to couple the cancellation signal into the first receiving path, so that a spatially coupled interference signal in the first frequency band radio frequency signal transmitted by the radio frequency tag through the first receiving path and the cancellation signal perform signal cancellation to obtain a first frequency band radio frequency signal from which the interference signal is cancelled, where a phase difference between a phase of the cancellation signal and the spatially coupled interference signal is 180 °, and an amplitude of the cancellation signal is the same as an amplitude of the spatially coupled interference signal.
5. The circuit of claim 4, wherein the signal cancellation path comprises a radio frequency signal amplifier in a first frequency band;
the input end of the radio frequency signal amplifier is connected with the counteracting signal generator, and the output end of the radio frequency signal amplifier is connected with the third end of the second directional coupler.
6. The circuit of claim 4 or 5,
the offset signal generator comprises an offset modulator, an offset local oscillator and an offset digital-to-analog converter;
the offset modulator is respectively connected with the offset local oscillator and the offset digital-to-analog converter, and is configured to receive an offset carrier signal output by the offset local oscillator and an offset control signal output by the offset digital-to-analog converter, perform signal modulation on the offset carrier signal and the offset control signal, and output an offset signal;
the first signal receiver comprises a first modulator, a first local oscillator and a first analog-to-digital converter;
wherein the first modulator is respectively connected with the first local oscillator and the first analog-to-digital converter, and is configured to
Receiving a first carrier signal output by the first local oscillator and a first frequency band radio frequency signal transmitted by a radio frequency tag transmitted by a first end of the first receiving channel, and outputting the first carrier signal and the first frequency band radio frequency signal transmitted by the radio frequency tag to the first analog-to-digital converter after signal modulation;
the frequency of the first carrier signal is the same as the frequency of the cancellation carrier signal.
7. The circuit of claim 2, further comprising a first single pole double throw switch and a second single pole double throw switch;
when the first signal generator and the second signal generator are the same target signal generator and the first signal receiver and the second signal receiver are the same target signal receiver,
a first end of the first single-pole double-throw switch is connected with the target signal generator, a second end of the first single-pole double-throw switch is connected with a first end of the first sending path, and a third end of the first single-pole double-throw switch is connected with a first end of the second sending path;
the first end of the second single-pole double-throw switch is connected with a target signal receiver, the second end of the second single-pole double-throw switch is connected with the first end of the first receiving path, and the third end of the second single-pole double-throw switch is connected with the first end of the second receiving path.
8. The circuit of claim 2 or 7,
the first transmit path comprises a first band pass filter, a first power amplifier, and a first low pass filter;
the input end of the first band-pass filter is connected with the first signal generator, the output end of the first band-pass filter is connected with the input end of the first power amplifier, the output end of the first power amplifier is connected with the input end of the first low-pass filter, and the output end of the first low-pass filter is connected with the second port of the first directional coupler;
the first receiving path comprises a second band-pass filter, a second low-noise amplifier and a second low-pass filter;
the input end of the second band-pass filter is connected with the third port of the first directional coupler, the output end of the second band-pass filter is connected with the input end of the second low-noise amplifier, the output end of the second low-noise amplifier is connected with the input end of the second low-pass filter, and the output end of the second low-pass filter is connected with the first signal receiver.
9. The circuit of claim 2 or 7,
the second transmit path includes a third band pass filter, a third power amplifier, and a third low pass filter;
the input end of the third band-pass filter is connected with the second signal generator, the output end of the third band-pass filter is connected with the input end of the third power amplifier, the output end of the third power amplifier is connected with the input end of the third low-pass filter, and the output end of the third low-pass filter is connected with the third port of the single-pole multi-throw switch;
the second receive path comprises a fourth band-pass filter, a fourth low noise amplifier, and a fourth low-pass filter;
the input end of the fourth band-pass filter is connected with the fourth port of the single-pole multi-throw switch, the output end of the fourth band-pass filter is connected with the input end of the fourth low-noise amplifier, the output end of the fourth low-noise amplifier is connected with the input end of the fourth low-pass filter, and the output end of the fourth low-pass filter is connected with the second signal receiver.
10. The circuit of claim 1, wherein the first band of radio frequency signals is an ultra high frequency radio wave (UHF) and the second band of radio frequency signals is a C band.
11. A terminal device, characterized in that the terminal device comprises a radio frequency circuit according to any of claims 1-10.
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