CN106941363B - Card reading response method, apparatus and system - Google Patents
Card reading response method, apparatus and system Download PDFInfo
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- CN106941363B CN106941363B CN201710058100.3A CN201710058100A CN106941363B CN 106941363 B CN106941363 B CN 106941363B CN 201710058100 A CN201710058100 A CN 201710058100A CN 106941363 B CN106941363 B CN 106941363B
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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
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Abstract
The present invention provides a kind of signal response method, apparatus and system, wherein method include: be 13.56MHz using resonance frequency antenna receive the carrier signal that frequency is 125KHz;Carrier signal is amplified, and analog-to-digital conversion is carried out to amplified signal, obtains digital signal;The characteristics of signals of carrier signal is obtained according to digital signal, characteristics of signals includes at least: frequency and phase;Response data is encoded with frequency, obtains encoded signal, and determines the start-phase of exports coding signal according to phase, by antenna exports coding signal, is superimposed encoded signal at same phase with carrier signal.Signal response method, apparatus and system through the invention, the signal that the antenna transmitting-receiving frequency that the resonance frequency that can use small volume is 13.56MHz is 125KHz, to realize the demand of device miniaturization.
Description
Technical field
The present invention relates to the communications field more particularly to a kind of card reading response methods, apparatus and system.
Background technique
Currently, for RFID card, the card of card and 125KHz including at least 13.56MHz.For integrated now
Demand for, 13.56MHz mode had not only been set on the same card but be arranged 125KHz mode be there is an urgent need to, so as to
So that there are many functions for a fixture, it is easy to use.But since the antenna of 125KHz is larger, be not suitable for making for small device
With, therefore, how on small device realize 125KHz mode card be problem in the urgent need to address.
Summary of the invention
Present invention seek to address that the above problem, a kind of card reading response method, apparatus and system are provided.
The main purpose of the present invention is to provide a kind of card reading response methods;
Another object of the present invention is to provide a kind of card reading responding devices;
Another object of the present invention is to provide a kind of card reading response system.
In order to achieve the above objectives, technical solution of the present invention is specifically achieved in that
One aspect of the present invention provides a kind of signal response method, comprising: the antenna for being 13.56MHz using resonance frequency
Receive the carrier signal that frequency is 125KHz;Carrier signal is amplified, and analog-to-digital conversion is carried out to amplified signal, is obtained
To digital signal;The characteristics of signals of carrier signal is obtained according to digital signal, characteristics of signals includes at least: frequency and phase;
Response data is encoded with frequency, obtains encoded signal, and determines the start-phase of exports coding signal according to phase, is led to
Antenna exports coding signal is crossed, is superimposed encoded signal at same phase with carrier signal.
In addition, the phase difference of start-phase and carrier signal is 0.
In addition, response data is unique identifier.
Another aspect of the present invention provides a kind of signal responding device, comprising: receiving module, for being using resonance frequency
The antenna of 13.56MHz receives the carrier signal that frequency is 125KHz;Signal processing module, for being amplified to carrier signal,
And analog-to-digital conversion is carried out to amplified signal, obtain digital signal;Characteristics of signals obtains module, for being obtained according to digital signal
The characteristics of signals of carrier signal is taken, characteristics of signals includes at least: frequency and phase;Output module, for by response data with
Frequency is encoded, and encoded signal is obtained, and the start-phase of exports coding signal is determined according to phase, is exported and is compiled by antenna
Code signal is superimposed encoded signal at same phase with carrier signal.
In addition, the phase difference of start-phase and carrier signal is 0.
In addition, response data is unique identifier.
In addition, signal processing module includes at least amplifier and comparator or signal processing module includes at least amplification
Device and sample circuit.
Another aspect of the invention provides a kind of signal response system, including above-mentioned signal responding device and read-write dress
It sets;Read-write equipment, for sending the carrier signal that frequency is 125KHz, and received encoded signal.
As seen from the above technical solution provided by the invention, through the invention signal response method, device and it is
System, the signal that the antenna transmitting-receiving frequency that the resonance frequency that can use small volume is 13.56MHz is 125KHz are set with realizing
The demand of standby miniaturization.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the flow chart of signal response method provided in an embodiment of the present invention;
Fig. 2 is the structural schematic diagram of signal responding device provided in an embodiment of the present invention;
Fig. 3 is the structural schematic diagram of signal response system provided in an embodiment of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", "upper", "lower",
The orientation or positional relationship of the instructions such as "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outside" is
It is based on the orientation or positional relationship shown in the drawings, is merely for convenience of description of the present invention and simplification of the description, rather than instruction or dark
Show that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore should not be understood as pair
Limitation of the invention.In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply opposite
Importance or quantity or position.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected;It can
To be mechanical connection, it is also possible to be electrically connected;It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
The embodiment of the present invention is described in further detail below in conjunction with attached drawing.
Fig. 1 shows as the flow chart of signal response method provided in an embodiment of the present invention, and referring to Fig. 1, the present invention is implemented
The signal response method that example provides, comprising:
The antenna that S101 is 13.56MHz using resonance frequency receives the carrier signal that frequency is 125KHz.
Wherein, since the antenna volume that the antenna ratio resonance frequency of resonance frequency 13.56MHz is 125K is small, it can be with
The antenna that resonance frequency is 13.56MHz is set on small device, to prevent from being not easy to miniaturization since antenna is excessive and setting
The antenna that resonance frequency is 13.56MHz is arranged in meter, therefore, the embodiment of the present invention on signal responding device, passes through resonance frequency
The transmitting-receiving of signal is carried out for the antenna of 13.56MHz.Certainly, the resonance frequency that the present invention is arranged is that the antenna of 13.56MHz may be used also
To normally receive frequency for the carrier signal of 13.56MHz, to realize the double mode of equipment.
It is worth noting that resonance frequency documented by the embodiment of the present invention is that 13.56MHz is not limited to resonance frequency
Only 13.56MHz, since the characteristic of antenna is different, resonance frequency is that the antenna of 13.56MHz should be construed broadly, and is referred to humorous
Antenna of the vibration frequency near 13.56MHz should belong to the antenna that the resonance frequency of record of the embodiment of the present invention is 13.56MHz,
For example, it is 13.56MHz's that the antenna that resonance frequency is 13.56MHz ± 7KHz, which should belong to resonance frequency documented by the present invention,
Antenna.Likewise, it is only 125KHz that frequency documented by the embodiment of the present invention, which is not limited to frequency for 125KHz, due to sending
The characteristic of the device (such as read-write equipment etc.) of carrier signal is different, and the carrier signal that the frequency sent is 125KHz also should be by
It broadly understood, refer to that carrier signal of the frequency near 125KHz should belong to the frequency that the embodiment of the present invention is recorded and be
The carrier signal of 125KHz, for example, the antenna that frequency is the carrier signal ± nKHz of 125KHz should belong to recorded in the present invention
Frequency be 125KHz carrier signal, wherein n be preset value.
S102 amplifies carrier signal, and carries out analog-to-digital conversion to amplified signal, obtains digital signal.
Wherein, since the frequency for sending the carrier signal that the device of carrier signal is sent is 125KHz, and signal response dress
The antenna for using resonance frequency as 13.56MHz is set, signal responding device is received by the antenna that resonance frequency is 13.56MHz
The amplitude of carrier signal is smaller, is not enough to be identified by signal responding device, the load that therefore, it is necessary to receive signal responding device
Wave signal amplifies, and to amplify the amplitude of carrier signal, signal responding device is allowed to identify the carrier signal.It is specific real
In existing, carrier signal amplification can be realized using amplifier and peripheral circuit.
Signal responding device carries out modulus after amplifying carrier signal, to amplified carrier signal (such as sine wave)
Conversion sends information to form digital signal (such as square wave) so as to obtain sending the device of carrier signal, which can
It also may include being sent to signal responding device to include the information for the preset format that indication signal responding device is responded
Data, this in the present invention and is not particularly limited.It can in the specific implementation, carrying out analog-to-digital conversion to amplified carrier signal
To realize using comparator and peripheral circuit, it can also realize that this is not provided in the present invention using A/D sample circuit
Body limits, as long as the implementation that may be implemented to obtain amplified carrier signal progress analog-to-digital conversion digital signal should all belong to
In protection scope of the present invention.
S103 obtains the characteristics of signals of carrier signal according to digital signal, and characteristics of signals includes at least: frequency and phase
Position.
Wherein, since the characteristic for sending the device of carrier signal is different, the carrier signal characteristic for causing it to send also not phase
Together, therefore, the carrier signal that the device that signal responding device receives that some sends carrier signal is sent, also needs to obtain its transmission
Carrier signal characteristics of signals, the characteristics of signals include at least the carrier signal frequency and phase.It responds and fills in signal
After setting the characteristics of signals for getting received carrier signal, the dress that the transmission carrier signal of information exchange is carried out with it can be known
The characteristic set, and can be sent information to according to the identical characteristic with the device for sending carrier signal and send carrier signal
Device, to complete information exchange.For example, the frequency for the carrier signal that the device for sending carrier signal is sent is 125.3KHz, letter
After number responding device receives the carrier signal, the frequency for getting the carrier signal is 125.3KHz, is filled so that signal responds
Postponing to continue uses frequency to respond for the response signal of 125.3KHz to the device for sending carrier signal.
In the specific implementation, comparator and peripheral circuit can be used when carrying out analog-to-digital conversion to amplified carrier signal
When realization, signal responding device can determine the characteristic of carrier signal by the square wave that comparator exports;When to amplified load
When wave signal carries out analog-to-digital conversion using the realization of A/D sample circuit, signal responding device can be by sampling obtained sine wave
Determine the characteristic of carrier signal.
S104 encodes response data with frequency, obtains encoded signal, and determine exports coding signal according to phase
Start-phase be superimposed encoded signal at same phase with carrier signal by antenna exports coding signal.
Wherein, in response to the device for sending carrier signal, signal responding device is needed with frequency identical with carrier signal
Rate is encoded, and sends encoded signal with phase identical with carrier signal, to guarantee encoded signal with carrier signal in phase
It is superimposed at same-phase, enhances the amplitude of carrier signal, make the device for sending carrier signal is available to arrive, rung to complete signal
Answer information transmission of the device to the device for sending carrier signal.Preferably, the phase difference of start-phase and carrier signal is 0, can
So that encoded signal is superimposed with what carrier signal was completely coincident at same phase, enhance the amplitude of carrier signal, facilitates hair
The device of carrier signal is sent to obtain.
It can be seen that signal response method through the invention, the resonance frequency that can use small volume are
The antenna transmitting-receiving frequency of 13.56MHz is the signal of 125KHz, to realize the demand of device miniaturization.
As an optional embodiment of the embodiment of the present invention, response data is unique identifier.At this point, sending carrier wave
The device of signal can be used as ID card with read-write equipment, such as card reader, signal responding device to respond card reader.Wherein,
Unique identifier can be ID number, such as identification card number etc..
Fig. 2 shows the structural schematic diagrams for signal responding device provided in an embodiment of the present invention, referring to fig. 2, the present invention
The signal responding device 20 that embodiment provides, comprising:
Receiving module 201, for be 13.56MHz using resonance frequency antenna receive frequency be 125KHz carrier wave letter
Number;
Signal processing module 202 carries out analog-to-digital conversion for amplifying to carrier signal, and to amplified signal,
Obtain digital signal;
Characteristics of signals obtains module 203, and for obtaining the characteristics of signals of carrier signal according to digital signal, characteristics of signals is extremely
It less include: frequency and phase;
Output module 204 obtains encoded signal, and determine according to phase for encoding response data with frequency
The start-phase of exports coding signal makes encoded signal and carrier signal at same phase by antenna exports coding signal
Superposition.
Wherein, since the antenna volume that the antenna ratio resonance frequency of resonance frequency 13.56MHz is 125K is small, it can be with
The antenna that resonance frequency is 13.56MHz is set on small device, to prevent from being not easy to miniaturization since antenna is excessive and setting
The antenna that resonance frequency is 13.56MHz is arranged in meter, therefore, the embodiment of the present invention on signal responding device 20, passes through resonance frequency
Rate is that the antenna of 13.56MHz carries out the transmitting-receiving of signal.Certainly, the resonance frequency that the present invention is arranged be 13.56MHz antenna also
The carrier signal that frequency is 13.56MHz can be normally received, to realize the double mode of equipment.
It is worth noting that resonance frequency documented by the embodiment of the present invention is that 13.56MHz is not limited to resonance frequency
Only 13.56MHz, since the characteristic of antenna is different, resonance frequency is that the antenna of 13.56MHz should be construed broadly, and is referred to humorous
Antenna of the vibration frequency near 13.56MHz should belong to the antenna that the resonance frequency of record of the embodiment of the present invention is 13.56MHz,
For example, it is 13.56MHz's that the antenna that resonance frequency is 13.56MHz ± 7KHz, which should belong to resonance frequency documented by the present invention,
Antenna.Likewise, it is only 125KHz that frequency documented by the embodiment of the present invention, which is not limited to frequency for 125KHz, due to sending
The characteristic of the device (such as read-write equipment etc.) of carrier signal is different, and the carrier signal that the frequency sent is 125KHz also should be by
It broadly understood, refer to that carrier signal of the frequency near 125KHz should belong to the frequency that the embodiment of the present invention is recorded and be
The carrier signal of 125KHz, for example, the antenna that frequency is the carrier signal ± nKHz of 125KHz should belong to recorded in the present invention
Frequency be 125KHz carrier signal, wherein n be preset value.
The frequency for the carrier signal that device due to sending carrier signal is sent is 125KHz, and receiving module 201 uses
Resonance frequency is the antenna of 13.56MHz, the amplitude of carrier signal received by the antenna that resonance frequency is 13.56MHz compared with
It is small, it is not enough to be identified by signal responding device 20, therefore, it is necessary to signal processing modules 202 to receive signal responding device 20
Carrier signal amplify, to amplify the amplitude of carrier signal, signal responding device 20 is allowed to identify the carrier signal.
Signal processing module 202 carries out analog-to-digital conversion after amplifying carrier signal, to amplified carrier signal (such as sine wave),
To form digital signal (such as square wave), information is sent so as to obtain sending the device of carrier signal, which can wrap
The information for including the preset format that indication signal responding device 20 is responded also may include sending to signal responding device 20
Data, this in the present invention and is not particularly limited.
As an optional embodiment of the invention, signal processing module 202 includes at least amplifier and comparator, or
Person's signal processing module includes at least amplifier and sample circuit, and the specific implementation form of signal processing module 202 is in this hair
Specific restriction is not made in bright, as long as may be implemented to amplify carrier signal, and amplified carrier signal is carried out
The implementation that analog-to-digital conversion obtains digital signal is within the scope of protection of the invention.
Since the characteristic for sending the device of carrier signal is different, the carrier signal characteristic for causing it to send is not also identical, because
This, signal responding device 20 receives the carrier signal that the device that some sends carrier signal is sent, and also needs to obtain its transmission
The characteristics of signals of carrier signal, the characteristics of signals include at least the frequency and phase of the carrier signal.It is obtained in characteristics of signals
After module 203 gets the characteristics of signals of received carrier signal, it can know that the transmission carrier wave for carrying out information exchange with it is believed
Number device characteristic, and transmission carrier wave can be sent information to according to the identical characteristic of device for sending carrier signal
The device of signal, to complete information exchange.For example, the frequency for the carrier signal that the device for sending carrier signal is sent is
125.3KHz, after receiving module 201 receives the carrier signal, by the processing of signal processing module 202, characteristics of signals is obtained
Module 203 get the carrier signal frequency be 125.3KHz, used so that signal responding device 20 is subsequent frequency for
The response signal of 125.3KHz responds the device for sending carrier signal.
In the specific implementation, comparator and peripheral circuit can be used when carrying out analog-to-digital conversion to amplified carrier signal
When realization, characteristics of signals obtains module 203 can determine the characteristic of carrier signal by the square wave that comparator exports;When to amplification
When carrier signal afterwards carries out analog-to-digital conversion using the realization of A/D sample circuit, characteristics of signals, which obtains module 203, can pass through sampling
Obtained sine wave determines the characteristic of carrier signal.
In response to the device for sending carrier signal, the needs of the output module 204 of signal responding device 20 with carrier wave
The identical frequency of signal is encoded, and with phase identical with carrier signal send encoded signal, with guarantee encoded signal with
Carrier signal is superimposed at same phase, enhances the amplitude of carrier signal, makes the device for sending carrier signal is available to arrive, from
And complete information transmission of the signal responding device 20 to the device for sending carrier signal.Preferably, start-phase and carrier signal
Phase difference be 0, encoded signal can be made to be superimposed with what carrier signal was completely coincident at same phase, enhance carrier signal
Amplitude, facilitate send carrier signal device obtain.
It can be seen that signal responding device 20 through the invention, the resonance frequency that can use small volume are
The antenna transmitting-receiving frequency of 13.56MHz is the signal of 125KHz, to realize the demand of device miniaturization.
As an optional embodiment of the embodiment of the present invention, response data is unique identifier.At this point, sending carrier wave
The device of signal can be used as ID card with read-write equipment, such as card reader, signal responding device 20 to respond card reader.Its
In, unique identifier can be ID number, such as identification card number etc..
Fig. 3 shows the structural schematic diagram of signal response system provided in an embodiment of the present invention, and referring to Fig. 3, the present invention is real
The signal response system of example offer, including read-write equipment 10 and signal responding device 20 are provided;Wherein signal responding device 20 is
Above-mentioned signal responding device, details are not described herein, read-write equipment 10, for sending the carrier signal that frequency is 125KHz, and
Received encoded signal.
The signal response system provided through the embodiment of the present invention can also be realized while guaranteeing device miniaturization
Information exchange.
Any process described otherwise above or method description are construed as in flow chart or herein, and expression includes
It is one or more for realizing specific logical function or process the step of executable instruction code module, segment or portion
Point, and the range of the preferred embodiment of the present invention includes other realization, wherein can not press shown or discussed suitable
Sequence, including according to related function by it is basic simultaneously in the way of or in the opposite order, Lai Zhihang function, this should be of the invention
Embodiment person of ordinary skill in the field understood.
It should be appreciated that each section of the invention can be realized with hardware, software, firmware or their combination.Above-mentioned
In embodiment, software that multiple steps or method can be executed in memory and by suitable instruction execution system with storage
Or firmware is realized.It, and in another embodiment, can be under well known in the art for example, if realized with hardware
Any one of column technology or their combination are realized: having a logic gates for realizing logic function to data-signal
Discrete logic, with suitable combinational logic gate circuit specific integrated circuit, programmable gate array (PGA), scene
Programmable gate array (FPGA) etc..
Those skilled in the art are understood that realize all or part of step that above-described embodiment method carries
It suddenly is that relevant hardware can be instructed to complete by program, the program can store in a kind of computer-readable storage medium
In matter, which when being executed, includes the steps that one or a combination set of embodiment of the method.
It, can also be in addition, each functional unit in each embodiment of the present invention can integrate in a processing module
It is that each unit physically exists alone, can also be integrated in two or more units in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.The integrated module is such as
Fruit is realized and when sold or used as an independent product in the form of software function module, also can store in a computer
In read/write memory medium.
Storage medium mentioned above can be read-only memory, disk or CD etc..
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any
One or more embodiment or examples in can be combined in any suitable manner.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective
In the case where can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.The scope of the present invention
By appended claims and its equivalent limit.
Claims (9)
1. a kind of signal response method characterized by comprising
The antenna for being 13.56MHz using resonance frequency receives the carrier signal that frequency is 125KHz;
The carrier signal is amplified, and analog-to-digital conversion is carried out to amplified signal, obtains digital signal;
Obtain the characteristics of signals of the carrier signal according to the digital signal, the characteristics of signals includes at least: frequency and
Phase;
Response data is encoded with the frequency, obtains encoded signal, and determine according to the phase and export the coding
The start-phase of signal exports the encoded signal by the antenna, makes the encoded signal with the carrier signal in phase
It is superimposed at same-phase.
2. the method according to claim 1, wherein the phase difference of the start-phase and the carrier signal is
0。
3. method according to claim 1 or 2, which is characterized in that the response data is unique identifier.
4. a kind of signal responding device characterized by comprising
Receiving module, for be 13.56MHz using resonance frequency antenna receive frequency be 125KHz carrier signal;
Signal processing module carries out analog-to-digital conversion for amplifying to the carrier signal, and to amplified signal, obtains
Digital signal;
Characteristics of signals obtains module, for obtaining the characteristics of signals of the carrier signal, the signal according to the digital signal
Characteristic includes at least: frequency and phase;
Output module obtains encoded signal, and determine according to the phase for encoding response data with the frequency
The start-phase for exporting the encoded signal exports the encoded signal by the antenna, make the encoded signal with it is described
Carrier signal is superimposed at same phase.
5. device according to claim 4, which is characterized in that the phase difference of the start-phase and the carrier signal is
0。
6. device according to claim 4 or 5, which is characterized in that the response data is unique identifier.
7. according to the described in any item devices of claim 4 to 5, which is characterized in that the signal processing module is included at least and put
Big device and comparator or the signal processing module include at least amplifier and sample circuit.
8. device according to claim 6, which is characterized in that the signal processing module includes at least amplifier and compares
Device or the signal processing module include at least amplifier and sample circuit.
9. a kind of signal response system, which is characterized in that including the described in any item signal responding devices of such as claim 4 to 8
And read-write equipment;
The read-write equipment is the carrier signal of 125KHz for sending frequency, and receives the encoded signal.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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CN201710058100.3A CN106941363B (en) | 2017-01-23 | 2017-01-23 | Card reading response method, apparatus and system |
EP18741739.9A EP3573247B1 (en) | 2017-01-23 | 2018-01-04 | Card read response method, apparatus, and system, and signal transceiving device |
US16/479,600 US10873358B1 (en) | 2017-01-23 | 2018-01-04 | Card read response method, apparatus, and system, and signal transceiving device |
PCT/CN2018/071398 WO2018133676A1 (en) | 2017-01-23 | 2018-01-04 | Card read response method, apparatus, and system, and signal transceiving device |
SG11201906743XA SG11201906743XA (en) | 2017-01-23 | 2018-01-04 | Card read response method, apparatus, and system, and signal transceiving device |
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CN201710058100.3A CN106941363B (en) | 2017-01-23 | 2017-01-23 | Card reading response method, apparatus and system |
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CN106941363B true CN106941363B (en) | 2019-09-10 |
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CN101656352A (en) * | 2009-09-25 | 2010-02-24 | 厦门大学 | Double-frequency imaging fractal dipole antenna |
CN102682250A (en) * | 2011-03-11 | 2012-09-19 | 敖海 | Battery auxiliary radio frequency identification device (RFID) label chip signal reflecting method |
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US7248165B2 (en) * | 2003-09-09 | 2007-07-24 | Motorola, Inc. | Method and apparatus for multiple frequency RFID tag architecture |
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CN101344933A (en) * | 2008-09-04 | 2009-01-14 | 复旦大学 | An active radio frequency identification tag |
CN101656352A (en) * | 2009-09-25 | 2010-02-24 | 厦门大学 | Double-frequency imaging fractal dipole antenna |
CN102682250A (en) * | 2011-03-11 | 2012-09-19 | 敖海 | Battery auxiliary radio frequency identification device (RFID) label chip signal reflecting method |
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