CN114244388B - Reflection communication circuit and method based on double-frequency wireless power supply - Google Patents
Reflection communication circuit and method based on double-frequency wireless power supply Download PDFInfo
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- CN114244388B CN114244388B CN202111305666.4A CN202111305666A CN114244388B CN 114244388 B CN114244388 B CN 114244388B CN 202111305666 A CN202111305666 A CN 202111305666A CN 114244388 B CN114244388 B CN 114244388B
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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
- 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
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention belongs to the field of wireless communication chips, and relates to a reflection communication circuit and a method based on double-frequency wireless power supply, wherein the circuit comprises the following components: the device comprises an interrogation terminal, a mutual inductance antenna, a resonant network, a rectifier and a variable impedor; the interrogation terminal comprises: the power supply signal generating circuit, the duplexer and the radio frequency receiver; the mutual inductance antenna includes: a transmit antenna T1 and a receive antenna T2; the duplexer is a three-port filter device, two independent frequency passbands are arranged between a port P1 and a port P2, and between a port P1 and a port P3, the port P1 is connected to a transmitting antenna T1, the port P2 is connected to the output end of the power supply signal generating circuit, and the port P3 is connected to the radio frequency receiver; the receiving antenna T2 and the transmitting antenna T1 are connected with the resonant network in parallel through inductive coupling; the variable impedance device is connected in parallel with the resonant network; the resonant network output is connected to a rectifier. The invention improves the signal-to-noise ratio of communication and the integration level of a chip, and saves the power consumption and the area of a circuit.
Description
Technical Field
The invention belongs to the field of wireless communication chips, and relates to a reflection communication circuit and method based on double-frequency wireless power supply.
Background
In a batteryless communication system, an interrogation terminal transmits a high frequency field to power a batteryless tag terminal and reads a communication signal reflected by the tag terminal to the interrogation terminal. In general, the tag end collects energy to supply power, and modulates a radio frequency signal with a baseband signal to generate reflection for communication. The Miniaturized tag end has advantages in volume, but the energy collection efficiency is low, the interrogation end needs to transmit a high-power signal to supply power to the Miniaturized tag end, the frequency of the reflected signal is close to the power supply frequency, the power supply signal greatly interferes with the reflected communication signal, and the communication signal-to-noise ratio is deteriorated, for example, "a full-Integrated, Miniaturized (0.125 mm) 10.5 μ W Wireless new Sensor" published in volume 48, pages 960-970 of the IEEE Journal of Solid-State Circuits Journal in 2013 by 4 months is adopted to communicate the Miniaturized tag end with the interrogation end by using the traditional direct reflection communication, and the signal-to-noise ratio of only 10dB is realized. To obtain a communication signal that is easier to filter out interference, the frequency of the communication signal should be as far away as possible from the supply frequency. In the current wireless power supply system, there is a method of using an independent oscillator to generate a signal independent of the power supply frequency as an intermediate frequency signal. The baseband signal is modulated to the intermediate frequency and then modulated to the carrier wave to be reflected. For example, in pages 248-249 of ISSCC conference proceedings called 2/22/26/2015, "A5.8 GHz RF-Powered Transmitter with a 113 μ W32-QAM Transmitter Employing the IF-based Quadrature reception Technique" a document uses an independent oscillator to generate an intermediate frequency signal, so that the modulated communication signal can be far away from the power supply frequency, the interference of the power supply signal can be suppressed by a filter, and a high communication signal-to-noise ratio is obtained.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a reflection communication circuit and a method based on dual-frequency wireless power supply, and the specific technical scheme is as follows:
a reflective communication circuit based on dual-frequency wireless power, comprising: the device comprises an interrogation terminal, a mutual inductance antenna, a resonant network, a rectifier and a variable impedor; the interrogation terminal comprises: the power supply signal generating circuit, the duplexer and the radio frequency receiver; the mutual inductance antenna includes: a transmit antenna T1 and a receive antenna T2;
the duplexer is a three-port filter device, two independent frequency pass bands are arranged between a port P1 and a port P2, and between a port P1 and a port P3, the port P1 is connected to a transmitting antenna T1, the port P2 is connected to the output end of the power supply signal generating circuit, and the port P3 is connected to the radio frequency receiver; the receiving antenna T2 and the transmitting antenna T1 are connected with the resonant network in parallel through inductive coupling; the variable impedor is connected with the resonance network in parallel; the resonant network output is connected to a rectifier.
Preferably, the resonant network is composed of series-parallel connection of an inductor and a capacitor, and the resonant network resonates with the receiving antenna T2 at the frequency of the input signal.
Preferably, the power supply signal generating circuit generates radio frequency signals f1 and f2 containing two different frequencies by mixing or power synthesis, and shares the transmitting antenna T1 with the radio frequency receiver through the duplexer.
Preferably, the rectifier has nonlinearity, is composed of a plurality of rectifier circuits, receives ac input signals, i.e., rf signals f1 and f2, generates dc output to power the system, and generates intermodulation harmonics of different odd orders of two frequency components in the input signals as communication carriers, where the intermodulation harmonics of different odd orders are expressed by: i M f1-N f2 i, M > =1, N > =1, and M + N is an odd number.
Preferably, the impedance changer receives the baseband signal as a control signal, changes the total impedance connected to the receiving antenna T2, modulates the baseband signal onto a communication carrier and reflects the baseband signal back to the transmitting antenna T1, the modulated communication signal falling within the frequency pass band of the port P1 and the port P3.
Preferably, the rf receiver receives the modulated communication signal through port P3 and demodulates to recover the baseband signal data.
A reflection communication method based on dual-frequency wireless power supply is characterized in that a power supply signal generating circuit generates radio-frequency signals f1 and f2 containing two different frequencies through frequency mixing or power synthesis, the radio-frequency signals are transmitted to a transmitting antenna T1 through a duplexer and then transmitted, a receiving antenna T2 receives the radio-frequency signals, the radio-frequency signals are transmitted to a rectifier through a resonant network connection, the rectifier uses intermodulation harmonics of the radio-frequency signals generated by self nonlinearity as communication carriers, finally baseband signals are modulated onto the communication carriers through a variable impedance device and reflected back to the transmitting antenna T1 through the receiving antenna T2, the reflected signals are subjected to frequency selection and filtering through the duplexer, and then the reflected signals are demodulated and recovered with a radio-frequency receiver connected with the duplexer.
The invention has the beneficial effects that:
in the wireless power supply chip system, the required carrier signal is provided for chip communication, an additional local oscillator is not needed, and the signal-to-noise ratio of communication and the integration level of the chip are improved; meanwhile, the odd-order intermodulation signals of the power supply signals with two frequencies are used as carrier signals for communication, and the frequency spectrum has the advantages of being far away from power supply signal interference and easy to filter.
Drawings
FIG. 1 is a schematic block diagram of an electrical circuit of an embodiment of the present invention;
fig. 2 is a schematic diagram of a signal spectrum obtained by a radio frequency receiver at an interrogation end in a single experiment according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and examples.
As shown in figure 1, the reflection communication circuit and the method based on dual-frequency wireless power supply are used for wireless power supply by using two frequency signals f1 and f2, the two frequency signals are transmitted to a rectifier after being received by a mutual inductance antenna, and due to the nonlinearity of the rectifier, the current of the antenna contains three-order intermodulation signals 2f2-f1 with frequencies f1 and f2 besides the components with the frequencies f1 and f2, and the three-order intermodulation signals are reversely radiated back to a transmitting antenna through the receiving antenna. The third order intermodulation signals, which are derived from harmonics of the two high quality incident signals f1 and f2, have high frequency stability and low phase noise and can be used as carriers for communications. The impedance varying device which is connected with the resonant network in parallel is modulated by data to be transmitted, so that impedance connected with the antenna changes along with the transmitted data, and the signal is modulated to 2f2-f1 on the third-order intermodulation signals of f1 and f2 and is reflected to the transmitting end together, so that the communication signal is far away from strong interference signals f1 and f2, the use of a high-frequency local oscillation circuit is avoided, and meanwhile, the power consumption and the area of the circuit are saved.
Specifically, the circuit includes: the antenna comprises an interrogation terminal, a mutual inductance antenna, a resonant network, a rectifier and a variable impedance device, wherein the mutual inductance antenna consists of a transmitting antenna T1 and a receiving antenna T2.
The interrogation terminal comprises: the power supply signal generating circuit comprises a power supply signal generating circuit, a duplexer and a radio frequency receiver.
The power supply signal generating circuit generates radio-frequency signals f1 and f2 containing two different frequencies through frequency mixing or power synthesis, the receiving antenna T2 receives the radio-frequency signals and is connected to the rectifier through a resonant network, the rectifier utilizes intermodulation harmonics of the power supply signals generated by self nonlinearity as communication carrier waves, baseband signals are modulated onto the carrier waves through the variable impedance device and are reflected back to the transmitting antenna T1 through the receiving antenna T2, and baseband data are demodulated and recovered by the radio-frequency receiver after frequency selection and filtering are carried out through the duplexer.
The duplexer is a three-port device with filtering characteristics, wherein two independent frequency passbands are arranged between the port P1 and the port P2, and between the port P1 and the port P3, so that the power supply signal generating circuit and the radio frequency receiver can share the antenna and transmit signals of different frequency bands. The output end of the power supply signal generating circuit is connected to a transmitting end P2 of the duplexer, an antenna multiplexing end P1 of the duplexer is connected to a transmitting antenna T1, a port P3 is connected to a radio frequency receiver, and after the reflected communication signal is filtered between ports P1 and P3 of the duplexer, the leakage of f1 and f2 component signals reaching a port P3 can be restrained.
The receiving antenna T2 and the transmitting antenna T1 are connected in parallel with the resonant network through inductive coupling. The resonant network consists of series-parallel connection of an inductor and a capacitor and resonates with the receiving antenna T2 on the frequency of an input signal to realize maximum gain transmission of a radio frequency signal; the receiving antenna T2 receives the dual-frequency rf signals f1 and f2 transmitted by the transmitting antenna T1, and inputs the signals to the rectifier through the resonant network.
The rectifier consists of a plurality of rectifying circuits, can receive an alternating current input signal, generates a direct current output to supply power to a system, has strong nonlinearity, and can generate a third-order intermodulation harmonic 2f2-f1 or 2f1-f2 of two frequency components in the input signal.
The impedance transformer is connected in parallel with the resonant network, and the impedance can be changed according to the control signal, so that the impedance transformer has nonlinearity. The variable impedance device may receive the baseband signal as a control signal to change the total impedance connected to the receiving antenna T2, thereby changing the strength of the signal reflected back to the transmitting antenna T1, modulating the baseband signal onto a carrier and reflecting back to the transmitting antenna T1, and the modulated communication signal falls within the pass band of port P1 and port P3.
The invention uses a communication method based on dual-frequency wireless power supply in a communication system without a battery. In fig. 2, a spectrum diagram observed by a radio frequency receiver at an interrogation end in a single experiment is shown, f1 and f2 are power supply signal frequencies which may interfere with demodulation, 2f2-f1 are carriers for third-order intermodulation, and f1 and f2 are far from 2f2-f1, and can be effectively filtered by a duplexer.
It can be seen from the above embodiments that, in the embodiments of the present invention, by using a reflection communication method based on dual-frequency power supply, a communication carrier is far away from a strong power supply interference signal on a frequency spectrum, so that the power supply interference signal is easy to filter, the signal-to-blocking ratio is improved, and the characteristic of a higher signal-to-noise ratio is achieved.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the foregoing has described the practice of the present invention in detail, it will be apparent to those skilled in the art that modifications may be made to the practice of the invention as described in the foregoing examples, or that certain features may be substituted in the practice of the invention. All changes, equivalents and modifications which come within the spirit and scope of the invention are desired to be protected.
Claims (5)
1. A reflective communication circuit based on dual-frequency wireless power, comprising: the device comprises an interrogation terminal, a mutual inductance antenna, a resonant network, a rectifier and a variable impedor; the interrogation terminal comprises: the power supply signal generating circuit, the duplexer and the radio frequency receiver; the mutual inductance antenna includes: a transmit antenna T1 and a receive antenna T2;
the duplexer is characterized in that the duplexer is a three-port filter device, two independent frequency passbands are arranged between a port P1 and a port P2, and between a port P1 and a port P3, the port P1 is connected to a transmitting antenna T1, the port P2 is connected to the output end of a power supply signal generating circuit, and the port P3 is connected to a radio frequency receiver; the receiving antenna T2 and the transmitting antenna T1 are connected with the resonant network in parallel through inductive coupling; the variable impedance device is connected in parallel with the resonant network; the resonant network output is connected to a rectifier;
the power supply signal generating circuit generates radio frequency signals f1 and f2 containing two different frequencies through frequency mixing or power synthesis, and shares a transmitting antenna T1 with a radio frequency receiver through a duplexer;
the rectifier is nonlinear and comprises a plurality of rectifying circuits, receives alternating current input signals, namely radio frequency signals f1 and f2, generates direct current output to supply power to a system, and generates intermodulation harmonics of different odd orders of two frequency components in the input signals as communication carriers, wherein the intermodulation harmonics of different odd orders have the expression: i M f1-N f2 i, M > =1, N > =1, and M + N is an odd number.
2. A dual frequency wireless power based reflective communication circuit as claimed in claim 1 wherein said resonant network is comprised of series parallel connections of inductors and capacitors, the resonant network resonating with the receive antenna T2 at the input signal frequency.
3. The reflective communication circuit based on dual frequency wireless power supply of claim 1, wherein the variable impedance device receives a baseband signal as a control signal, changes the total impedance connected to the receiving antenna T2, modulates the baseband signal onto a communication carrier wave and reflects it back to the transmitting antenna T1, the modulated communication signal falling within the frequency pass band of the port P1 and the port P3.
4. The dual-band wireless power based reflective communication circuit of claim 3, wherein said RF receiver receives a modulated communication signal through port P3 for demodulation to recover baseband signal data.
5. A reflective communication method using the reflective communication circuit based on dual-band wireless power supply as claimed in any one of claims 1-4, wherein the power supply signal generating circuit first generates radio frequency signals f1 and f2 containing two different frequencies by mixing or power synthesis, then transmits the radio frequency signals to the transmitting antenna T1 through the duplexer, then the receiving antenna T2 receives the radio frequency signals, and sends the radio frequency signals to the rectifier through the resonant network connection, then the rectifier uses its own nonlinearity to generate intermodulation harmonics of the radio frequency signals as communication carriers, finally the baseband signals are modulated onto the communication carriers through the variable impedance device, and then the baseband signals are reflected back to the transmitting antenna T1 through the receiving antenna T2, and the reflected signals are filtered by the duplexer and then demodulated by the radio frequency receiver connected with the duplexer to recover baseband data.
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| CN114244388B true CN114244388B (en) | 2022-09-02 |
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| CN116318271B (en) * | 2023-03-09 | 2024-05-28 | 脉砥微电子(杭州)有限公司 | Multi-carrier orthogonal reflection communication circuit and method based on wireless power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107516119A (en) * | 2016-06-17 | 2017-12-26 | 南京理工大学 | A kind of passive resonant sensor label of wireless poll |
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| US9385683B2 (en) * | 2013-02-21 | 2016-07-05 | Mediatek Inc. | Diplexer and transceiver thereof |
| CN111865355B (en) * | 2020-07-29 | 2021-09-03 | 西北工业大学 | Wireless power and information transmission system based on second harmonic |
| CN113114113A (en) * | 2021-05-14 | 2021-07-13 | 浙江大学 | Frequency signal generating circuit and method based on double-frequency wireless power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107516119A (en) * | 2016-06-17 | 2017-12-26 | 南京理工大学 | A kind of passive resonant sensor label of wireless poll |
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