CN211375609U - Mutual interference prevention circuit - Google Patents
Mutual interference prevention circuit Download PDFInfo
- Publication number
- CN211375609U CN211375609U CN201922455743.9U CN201922455743U CN211375609U CN 211375609 U CN211375609 U CN 211375609U CN 201922455743 U CN201922455743 U CN 201922455743U CN 211375609 U CN211375609 U CN 211375609U
- Authority
- CN
- China
- Prior art keywords
- signal
- radio frequency
- interference
- circuit
- frequency circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Abstract
The utility model discloses a prevent mutual interference circuit for reduce interference signal's intensity between hyperfrequency RFID and the cellular communication. The mutual interference prevention circuit is applied to a handheld ultrahigh frequency RFID reader-writer, a first signal processing module is used for processing signals transmitted by a radio frequency circuit corresponding to cellular communication to obtain first preset signals, and the signals transmitted by the radio frequency circuit are used for representing communication signals at the same working frequency as the signals transmitted by the RFID radio frequency circuit; the anti-mutual-interference processing module is used for receiving a first preset signal, a first amplitude control signal and a first phase control signal, and carrying out amplitude and phase adjustment on the first preset signal according to the first amplitude control signal and the first phase control signal to obtain a first processing signal; the second signal processing module is used for coupling the first processing signal and an interference signal of the RFID radio frequency circuit so as to cancel the first processing signal and the interference signal of the RFID radio frequency circuit.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to an anti-interference circuit.
Background
With the development of mobile communication, most of the current handheld RFID (Radio frequency identification) readers are equipped with a cellular communication module, or the RFID module exists as an external device of a smart phone. By the arrangement mode, the handheld RFID reader-writer can have a telephone/data communication function.
However, the operating frequency of uhf RFID is adjacent to some common frequency BANDs for cellular communication (such as BAND5 and BAND8), and the handset is limited in volume, and the antennas of the two are close to each other and cannot provide sufficient spatial isolation, so that the two operate simultaneously and interfere with each other, thereby affecting the performance of the two. In the prior art, in order to avoid interference, the two devices can only work in a time-sharing mode, namely, cellular communication is not used when the reader-writer works, and the reader-writer is not used when the cellular communication is used for making a call or surfing the internet, so that the use experience of the handheld reader-writer is reduced.
In view of this, how to reduce the strength of the interference signal between the ultrahigh frequency RFID and the cellular communication and improve the use experience of the handheld reader/writer becomes a technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model provides a prevent circuit of mutual interference for reduce interference signal's intensity between hyperfrequency RFID and the cellular communication.
In order to solve the technical problem, the utility model provides a prevent mutual interference circuit's technical scheme as follows:
the utility model provides an anti-interference circuit, is applied to hand-held type hyperfrequency RFID read write line, anti-interference circuit includes: the mutual interference prevention circuit module is connected with the first signal processing module and the second signal processing module, wherein:
the first signal processing module is used for processing signals transmitted by a radio frequency circuit corresponding to cellular communication to obtain first preset signals, and the signals transmitted by the radio frequency circuit corresponding to the cellular communication are used for representing communication signals of which the signals transmitted by the RFID radio frequency circuit corresponding to the handheld ultrahigh frequency RFID reader-writer are at the same working frequency;
the anti-mutual-interference processing module is used for receiving a first preset signal, a first amplitude control signal and a first phase control signal, and carrying out amplitude and phase adjustment on the first preset signal according to the first amplitude control signal and the first phase control signal to obtain a first processing signal;
the second signal processing module is configured to couple the first processing signal and an interference signal of the RFID radio frequency circuit to cancel the first processing signal and the interference signal of the RFID radio frequency circuit, where the interference signal is an adjacent channel interference signal generated by the cellular communication antenna sending an adjacent channel signal and the RFID radio frequency circuit antenna sending an adjacent channel signal when the cellular communication antenna and the RFID radio frequency circuit antenna work simultaneously.
In a possible implementation, the first signal processing module is a first directional coupler, and the first directional coupler is configured to couple signals transmitted by radio frequency circuits corresponding to the cellular communication to obtain a first predetermined signal, and the first predetermined signal is a part of signals in the cellular communication.
In a possible implementation manner, the second signal processing module is a second directional coupler, and the second directional coupler is configured to perform coupling cancellation processing on the first processing signal and the interference signal of the RFID radio frequency circuit, so as to cancel the first processing signal and the interference signal of the RFID radio frequency circuit.
In a possible implementation, the anti-mutual interference processing module is a modulator.
In one possible embodiment, the modulator is a vector modulator.
In a possible implementation manner, the modulator is configured to receive a first predetermined signal, a first amplitude control signal, and a first phase control signal, perform amplitude and phase adjustment on the first predetermined signal according to the first amplitude control signal and the first phase control signal, and obtain a first processed signal, so that the first processed signal and the interference signal of the RFID radio frequency circuit have equal amplitudes and are 180 ° out of phase.
In a possible implementation manner, the anti-mutual interference processing module comprises an adjustable attenuator and a phase shifter, wherein the adjustable attenuator is used for performing amplitude adjustment processing on the first predetermined signal according to a received first amplitude control signal so as to enable the amplitude of the first processed signal and the amplitude of the interference signal of the RFID radio frequency circuit to be equal; the phase shifter is used for processing the phase adjustment of the first preset signal according to the received first phase control signal, so that the phase difference between the first processing signal and the interference signal of the RFID radio frequency circuit is 180 degrees.
Through the utility model discloses an foretell technical scheme, the utility model discloses at least, following technological effect has:
the utility model provides an in the embodiment, handle the signal that the radio frequency circuit that cellular communication corresponds launches through first signal processing module to can obtain first predetermined signal, then first signal processing module will handle the first predetermined signal input that obtains and prevent mutually disturbing processing module, thereby prevent mutually disturbing processing module and can carry out amplitude and phase adjustment to first predetermined signal according to the first amplitude control signal and the first phase control signal of receipt, obtain first processing signal. Furthermore, the second signal processing module can couple the first processing signal with the interference signal of the RFID radio frequency circuit, so that the interference signal of the first processing signal and the interference signal of the RFID radio frequency circuit are cancelled, the strength of the interference signal is greatly reduced, the electromagnetic compatibility between the ultrahigh frequency RFID and the cellular communication is improved, and the use experience of the handheld RFID reader-writer is improved.
Drawings
In order to illustrate the embodiments of the present invention or the technical solutions in the prior art more clearly, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention.
Fig. 1 is a schematic structural diagram of an anti-crosstalk circuit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of another anti-mutual-interference circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another anti-crosstalk circuit according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. In the case of conflict, the embodiments and features of the embodiments of the present invention can be arbitrarily combined with each other. Also, while a logical order is shown in the flow diagrams, in some cases, the steps shown or described may be performed in an order different than here.
At present, a handheld Radio Frequency Identification (RFID) reader/writer has the characteristics of high reliability, low power consumption, miniaturization, off-line operation, data storage and the like, so that the reader/writer is widely applied to mobile occasions to perform various application management.
In the prior art, the working Frequency of the ultrahigh Frequency RFID of the handheld RFID reader-writer is generally between 860MHz and 960MHz, the working Frequency of part of common Frequency bands of cellular communication is generally between 800MHZ, and the volume of the handset is small, so that the handheld RFID reader-writer and the cellular communication interfere with each other when working simultaneously, and the use experience of the handheld reader-writer is reduced.
For better understanding of the technical solution provided by the present invention, the following introduces a system of RFID in the prior art:
in practical implementation, the composition of the RFID system may be slightly different according to different application scenarios. However, the whole system is generally divided into a signal transmitter, a signal receiver and a transmitting and receiving antenna.
In the actual implementation process, the signal transmitter may be generally understood as a tag, the tag may be used to store information to be identified and transmitted, and the tag may contain certain additional information, such as error checking information, besides the information to be transmitted. The label can automatically or under the action of external force actively transmit the stored information.
In particular, the signal receiver may be generally understood as a reader in the prior art, for example, a handheld ultrahigh frequency RFID reader according to an embodiment of the present invention. Specifically, the reader controls the transmission of the data stream by the received additional information, and once the information arriving at the reader is correctly received and decoded, the reader decides by a specific algorithm whether the transmitter needs to retransmit the transmitted signal once or knows that the transmitter stops signaling.
Specifically, the antenna is a transmitting and receiving device for transmitting data between the tag and the reader.
In practical implementation, the ultrahigh frequency of the reader is adjacent to a part of common frequency BANDs (such as BAND5 and BAND8) of cellular communication, the handset is limited in size, and the antennas of the two are close to each other, so that when the two are operated simultaneously, an interference signal is generated between a signal received by the corresponding receiving antenna of the reader and an antenna signal corresponding to the cellular communication.
Therefore, the utility model provides an anti-interference circuit for the operating frequency of the hyperfrequency RFID of the hand-held type RFID read write line who exists among the solution prior art borders on with the frequency channel commonly used of the part of cellular communication, leads to between the two technical problem that the while operation has the interference of each other.
In order to solve the above problem, the embodiment of the present invention provides a general idea as follows:
provided is an anti-interference circuit, including: first signal processing module, mutual interference prevention circuit module and second signal processing module, mutual interference prevention circuit module is connected with first signal processing module and second signal processing module, wherein: the first signal processing module is used for processing signals transmitted by the radio frequency circuit corresponding to the cellular communication to obtain first preset signals, and the signals transmitted by the radio frequency circuit corresponding to the cellular communication are used for representing communication signals of which the signals transmitted by the RFID radio frequency circuit corresponding to the handheld ultrahigh frequency RFID reader-writer are at the same working frequency; the anti-mutual-interference processing module is used for receiving a first preset signal, a first amplitude control signal and a first phase control signal, and carrying out amplitude and phase adjustment on the first preset signal according to the first amplitude control signal and the first phase control signal so as to obtain a first processing signal; and the second signal processing module is used for coupling the first processing signal and an interference signal of the RFID radio frequency circuit so as to cancel the first processing signal and the interference signal of the RFID radio frequency circuit, wherein the interference signal is an adjacent channel interference signal generated by the cellular communication antenna and the RFID radio frequency circuit antenna correspondingly when the cellular communication antenna and the RFID radio frequency circuit antenna work simultaneously.
In the above scheme, the first signal processing module processes the signal transmitted by the radio frequency circuit corresponding to the cellular communication, so as to obtain a first predetermined signal, and then the first signal processing module inputs the processed first predetermined signal to the mutual interference prevention processing module, so that the mutual interference prevention processing module can perform amplitude and phase adjustment on the first predetermined signal according to the received first amplitude control signal and the received first phase control signal, so as to obtain a first processed signal. Furthermore, the second signal processing module can couple the first processing signal with the interference signal of the RFID radio frequency circuit, so that the interference signal of the first processing signal and the interference signal of the RFID radio frequency circuit are cancelled, the strength of the interference signal is greatly reduced, the electromagnetic compatibility between the ultrahigh frequency RFID and the cellular communication is improved, and the use experience of the handheld RFID reader-writer is improved.
Referring to fig. 1, fig. 1 is a schematic diagram of an anti-crosstalk circuit according to an embodiment of the present invention. Specifically, the anti-mutual interference circuit includes a first signal processing module 11, an anti-mutual interference circuit module 12, and a second signal processing module 13.
The first signal processing module 11 is configured to process a signal transmitted by a radio frequency circuit corresponding to cellular communication to obtain a first predetermined signal, where the signal transmitted by the radio frequency circuit corresponding to cellular communication is used to represent a communication signal at the same operating frequency as a signal transmitted by an RFID radio frequency circuit corresponding to the handheld ultrahigh frequency RFID reader.
The anti-mutual-interference processing module 12 is configured to receive a first predetermined signal, a first amplitude control signal, and a first phase control signal, and perform amplitude and phase adjustment on the first predetermined signal according to the first amplitude control signal and the first phase control signal to obtain a first processed signal.
The second signal processing module 13 is configured to couple the first processing signal and an interference signal of the RFID radio frequency circuit, so that the first processing signal and the interference signal of the RFID radio frequency circuit cancel each other, where the interference signal is an adjacent channel interference signal generated by the cellular communication antenna sending an adjacent channel signal and the RFID radio frequency circuit antenna sending an adjacent channel signal when the cellular communication antenna and the RFID radio frequency circuit antenna simultaneously operate.
The utility model provides an in the embodiment, handle the signal that the radio frequency circuit that cellular communication corresponds launches through first signal processing module 11 to can obtain first predetermined signal, then first signal processing module handles 11 and inputs the first predetermined signal who obtains to prevent mutually disturbing processing module 12 in, thereby prevent mutually disturbing processing module 12 and can carry out amplitude and phase adjustment to first predetermined signal according to the first amplitude control signal and the first phase control signal of receipt, obtain first processing signal. Further, the second signal processing module 13 can couple the first processing signal with the interference signal of the RFID radio frequency circuit, so that the first processing signal and the interference signal of the RFID radio frequency circuit cancel each other, and the intensity of the interference signal is greatly reduced, thereby improving the use experience of the handheld RFID reader.
To facilitate understanding of the technical solutions of the present invention, the following embodiments are provided to illustrate some possible embodiments, and it should be understood that the following examples are only illustrative and not limiting, and other specific embodiments may be adopted in the specific implementation process except for the following embodiments, which are not exhaustive herein.
The first embodiment is as follows:
in the embodiment of the present invention, please refer to fig. 2, the mutual interference preventing circuit includes a first directional coupler 21 for coupling a signal transmitted by a radio frequency circuit in cellular communication to obtain a first predetermined signal, specifically, the first predetermined signal is a part of the signal in cellular communication, that is, the first directional coupler 21 can receive the signal transmitted by the radio frequency circuit in cellular communication, and then couple the predetermined signal to the signal transmitted by the radio frequency circuit in cellular communication. Specifically, the directional coupler is a general microwave/millimeter wave component, and can be used for signal isolation, separation and mixing. I.e. the aforementioned first directional coupler 21 is used to separate the signal transmitted by the radio frequency circuit in cellular communication to obtain the first predetermined signal.
With continued reference to fig. 2, the anti-crosstalk circuit further includes a modulator 22, and in particular, the modulator 22 may be a vector modulator, and in particular, the amplitude and phase of the signal may be adjusted by the vector modulator.
In the embodiment of the present invention, the modulator 22 can receive a first predetermined signal, a first amplitude control signal and a first phase control signal, specifically, the first amplitude control signal and the second amplitude control signal are signals output by the processor of the handheld ultrahigh frequency RFID reader. Then, the modulator may perform amplitude and phase adjustment on the first predetermined signal according to the first amplitude control signal and the first phase control signal to obtain a first processed signal, and specifically, the amplitude of the first processed signal is equal to the amplitude of the interference signal of the RFID radio frequency circuit, and the phase difference is 180 °.
With continued reference to fig. 2, the anti-mutual interference circuit further includes a second directional coupler 23, where the second directional coupler 23 is used for performing coupling cancellation processing on the first processing signal and the interference signal of the RFID radio frequency circuit, so as to cancel the first processing signal and the interference signal of the RFID radio frequency circuit. That is, the second directional coupler 23 can mix the first processing signal and the interference signal, and since the amplitudes of the first processing signal and the interference signal are equal and the phase difference is 180 °, cancellation of the first processing signal and the interference signal can be realized, so that reduction of the intensity of the interference signal to the handheld ultrahigh frequency RFID reader-writer is eliminated, and the use experience of the user on the handheld ultrahigh frequency RFID reader-writer is improved.
Example two:
in the embodiment of the present invention, please refer to the mutual interference prevention circuit shown in fig. 3, which includes the first directional coupler 21, the adjustable attenuator 31, the phase shifter 32 and the second directional coupler 23.
Specifically, the first directional coupler 21 is configured to couple a signal transmitted by a radio frequency circuit in cellular communication to obtain a first predetermined signal, specifically, the first predetermined signal is a part of the signal in cellular communication, that is, the first directional coupler 21 is configured to separate the signal transmitted by the radio frequency circuit in cellular communication to obtain the first predetermined signal.
In the embodiment of the present invention, the adjustable attenuator 31 is used to perform amplitude adjustment processing on the first predetermined signal according to the received first amplitude control signal, so that the amplitude of the first processing signal and the interference signal of the RFID rf circuit is equal. The phase shifter 32 is configured to process the first predetermined signal phase adjustment according to the received first phase control signal, so that the phase of the first processed signal and the phase of the interference signal of the RFID radio frequency circuit differ by 180 °. The second directional coupler 23 is used for performing coupling cancellation processing on the first processing signal and the interference signal of the RFID radio frequency circuit, so that the first processing signal and the interference signal of the RFID radio frequency circuit are cancelled.
The embodiment of the utility model provides an in, when the radio frequency circuit of cellular communication and hand-held type hyperfrequency RFID read write line simultaneous working, first directional coupler 21 can come out with the partly coupling of the signal of the radio frequency circuit transmission of cellular communication, first predetermined signal promptly, then first directional coupler 21 can be with first predetermined signal input to adjustable attenuator 31 and move the looks ware 32 in, then adjustable attenuator 31 carries out amplitude adjustment to first predetermined signal according to the first range control signal of receiving, it is concrete, adjust the amplitude of first predetermined signal to the amplitude the same with interference signal, wherein, interference signal is when cellular communication antenna and RFID radio frequency circuit antenna simultaneous working, cellular communication antenna sends adjacent channel signal and RFID radio frequency circuit antenna and sends the adjacent channel interference signal that the adjacent channel signal corresponds the production.
Further, the adjustable attenuator 31 may input the first predetermined signal after the amplitude adjustment to the phase shifter 32, so that the phase shifter 32 may perform phase adjustment on the first predetermined signal after the amplitude adjustment according to the first phase control signal, specifically, adjust the phase of the first predetermined signal after the amplitude adjustment to be 180 ° different from the phase of the interference signal, so as to obtain the first processed signal. Then, the phase shifter 32 can input the first processing signal to the second directional coupler 23, and then the second directional coupler 23 can mix the first processing signal and the interference signal, because the amplitude of the first processing signal is equal to that of the interference signal and the phase difference is 180 °, cancellation of the first processing signal and the interference signal can be realized, and then reduction of the intensity of the interference signal to the handheld ultrahigh frequency RFID reader-writer is eliminated, and the use experience of the user on the handheld ultrahigh frequency RFID reader-writer is improved.
The embodiment of the utility model provides an in, can be through the aforesaid as modulator 22 in fig. 2 or as adjustable attenuator 31 in fig. 3 and move looks ware 33 and carry out phase adjustment and amplitude adjustment to the signal that the coupling came out in the radio frequency circuit transmission's that cellular communication corresponds signal for the amplitude of this signal is the same with interfering signal's amplitude and the phase difference 180, thereby can make interfering signal can eliminate, and then make hand-held type hyperfrequency RFID read write line can normal use, and need not to avoid cellular communication's operating time, promote the user and use hand-held type hyperfrequency RFID read write line's use experience.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the appended claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the invention.
It is apparent that those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (7)
1. The mutual interference prevention circuit is applied to a handheld ultrahigh frequency RFID reader-writer and comprises: the mutual interference prevention circuit module is connected with the first signal processing module and the second signal processing module, wherein:
the first signal processing module is used for processing signals transmitted by a radio frequency circuit corresponding to cellular communication to obtain first preset signals, and the signals transmitted by the radio frequency circuit corresponding to the cellular communication are used for representing communication signals of which the signals transmitted by the RFID radio frequency circuit corresponding to the handheld ultrahigh frequency RFID reader-writer are at the same working frequency;
the anti-mutual-interference processing module is used for receiving a first preset signal, a first amplitude control signal and a first phase control signal, and carrying out amplitude and phase adjustment on the first preset signal according to the first amplitude control signal and the first phase control signal to obtain a first processing signal;
the second signal processing module is configured to couple the first processing signal and an interference signal of the RFID radio frequency circuit to cancel the first processing signal and the interference signal of the RFID radio frequency circuit, where the interference signal is an adjacent channel interference signal generated by the cellular communication antenna sending an adjacent channel signal and the RFID radio frequency circuit antenna sending an adjacent channel signal when the cellular communication antenna and the RFID radio frequency circuit antenna work simultaneously.
2. The anti-crosstalk circuit of claim 1 wherein the first signal processing module is a first directional coupler, the first directional coupler being configured to couple signals transmitted by radio frequency circuits corresponding to the cellular communication to obtain a first predetermined signal, the first predetermined signal being a portion of a signal in the cellular communication.
3. The anti-crosstalk circuit of claim 1 wherein the second signal processing module is a second directional coupler.
4. The anti-cross-talk circuit of claim 1, wherein the anti-cross-talk processing module is a modulator.
5. The anti-crosstalk circuit of claim 4 wherein said modulator is a vector modulator.
6. The anti-crosstalk circuit according to claim 4 wherein the modulator is configured to receive a first predetermined signal, a first amplitude control signal and a first phase control signal, and perform amplitude and phase adjustment on the first predetermined signal according to the first amplitude control signal and the first phase control signal to obtain a first processed signal, so that the first processed signal and the interference signal of the RFID radio frequency circuit have equal amplitudes and are 180 ° out of phase with each other.
7. The anti-crosstalk circuit of claim 1 wherein the anti-crosstalk processing module comprises an adjustable attenuator and a phase shifter, the adjustable attenuator being configured to perform an amplitude adjustment process on the first predetermined signal according to a received first amplitude control signal to equalize the amplitudes of the first processed signal and the interference signal of the RFID radio frequency circuit; the phase shifter is used for processing the phase adjustment of the first preset signal according to the received first phase control signal, so that the phase difference between the first processing signal and the interference signal of the RFID radio frequency circuit is 180 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922455743.9U CN211375609U (en) | 2019-12-30 | 2019-12-30 | Mutual interference prevention circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922455743.9U CN211375609U (en) | 2019-12-30 | 2019-12-30 | Mutual interference prevention circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211375609U true CN211375609U (en) | 2020-08-28 |
Family
ID=72157015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922455743.9U Active CN211375609U (en) | 2019-12-30 | 2019-12-30 | Mutual interference prevention circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211375609U (en) |
-
2019
- 2019-12-30 CN CN201922455743.9U patent/CN211375609U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111327344B (en) | Radio frequency system and electronic equipment | |
| US9408015B2 (en) | Reducing receiver performance degradation due to frequency coexistence | |
| US8180285B2 (en) | Millimeter wave near field communication device | |
| EP3944506A1 (en) | Radio frequency front-end circuit and mobile terminal | |
| US20110291811A1 (en) | Information processing device and receiving method | |
| CN114285433B (en) | Wireless communication assembly, method and terminal equipment | |
| KR20130134570A (en) | Near-field wireless transceiver circuit and mobile terminal | |
| WO2023051219A1 (en) | Radio-frequency circuit, radio-frequency module, and electronic device | |
| EP3425812B1 (en) | Systems and methods for a reconfigurable radio front-end | |
| CN113114300B (en) | Electronic equipment and control method | |
| WO2017117945A1 (en) | Mobile terminal | |
| CN211375609U (en) | Mutual interference prevention circuit | |
| CN103942513A (en) | Mobile reader | |
| CN102195120B (en) | RF (radio frequency) IC (integrated circuit) card | |
| EP1882230B1 (en) | Transceiver antenna arrangement | |
| US11196158B2 (en) | Electric composite detection antenna | |
| CN102256018B (en) | Mobile phone with integrated RFID (Radio Frequency Identification) function and communication method thereof | |
| CN108880572A (en) | A kind of NFC and RFID two-in-one antenna control system | |
| JP5137128B2 (en) | RFID reader / writer | |
| CN110969034B (en) | Carrier cancellation circuit and RFID reader-writer | |
| EP1280287A1 (en) | Composite radio apparatus and diversity switching method | |
| CN107689804A (en) | Radio frequency amplifier and system based on TDD mode of operations | |
| US6549760B1 (en) | Communications device | |
| WO2015172483A1 (en) | Near field communication device and working method, mobile terminal thereof | |
| CN105634511A (en) | NFC (Near Field Communication) and WIFI ((Wireless Fidelity) antenna shared circuit system and mobile terminal |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |