CN105844320A - Antenna and radio frequency identification system - Google Patents

Antenna and radio frequency identification system Download PDF

Info

Publication number
CN105844320A
CN105844320A CN201510018901.8A CN201510018901A CN105844320A CN 105844320 A CN105844320 A CN 105844320A CN 201510018901 A CN201510018901 A CN 201510018901A CN 105844320 A CN105844320 A CN 105844320A
Authority
CN
China
Prior art keywords
coil
antenna
unit
label
reader
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.)
Pending
Application number
CN201510018901.8A
Other languages
Chinese (zh)
Inventor
景为平
顾晓松
丁斐
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nantong University
Original Assignee
Nantong University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nantong University filed Critical Nantong University
Priority to CN201510018901.8A priority Critical patent/CN105844320A/en
Publication of CN105844320A publication Critical patent/CN105844320A/en
Pending legal-status Critical Current

Links

Landscapes

  • Near-Field Transmission Systems (AREA)

Abstract

The invention discloses an antenna and a radio frequency identification system, and the antenna comprises a first coil unit and a second coil unit. A first coil and a second coil are perpendicular to each other and are not intersected with each other. The first and second coils are respectively coupled to an antenna matching circuit. According to the above scheme, the antenna can improve the recognition rate of tags.

Description

Antenna and radio-frequency recognition system
Technical field
The present invention relates to technical field of RFID, particularly relate to a kind of antenna and radio-frequency recognition system.
Background technology
RF identification (Radio Frequency Identification, RFID) is a kind of communication technology, and it can With by radio wave identification specific objective and read and write related data, and without setting up between specific objective Machinery or optical contact.
Typical rfid system is made up of reader, label (transponder) and data handling system.For The rfid system of high frequency, communicating between reader with label be by aerial coil between inductive complete The transmission of information.
In prior art, when reader reads the identity information of label, antenna uses single coil to be connected to On mainboard, but, the deposit position of label is different so that antenna only can recognize that the mark on specific direction Sign, and the label on other directions be cannot be carried out identifying, accordingly, there exist tag recognition rate low Problem.
Summary of the invention
What the embodiment of the present invention solved is the discrimination how improving label.
For solving the problems referred to above, embodiments providing a kind of antenna, described antenna includes:
First coil unit and the second coil unit, described first coil unit and described second coil unit Be arranged in a mutually vertical manner and non-intersect, described first coil unit and described second coil unit respectively with accordingly Antenna-matching circuit couple.
Alternatively, described first coil unit includes first coil, the second coil, tertiary coil and the 4th Coil；
Described first coil is connected with described second coils connected in series, forms first coil group；
Described tertiary coil is connected with described 4th coils connected in series, forms the second coil groups；
Described first coil group is connected in parallel with described second coil groups.
Alternatively, described second coil unit includes: the 5th coil, the 6th coil, the 7th coil and Eight coils；
Described 5th coil is connected with described 6th coils connected in series, forms tertiary coil group；
Described 7th coil is connected with described 8th coils connected in series, forms the 4th coil groups；
Described tertiary coil group is connected in parallel with described 4th coil groups.
Alternatively, described first coil, described second coil, described tertiary coil, described 4th coil, Described 5th coil, described 6th coil, described 7th coil are identical with described 8th coil.
Alternatively, the length of side of described square coil is described antenna maximum receiving rangeTimes.
The embodiment of the present invention additionally provides a kind of radio-frequency recognition system, and described system includes: label, first Reader and user terminal, described reader couples with described label and described user terminal respectively, described First reader includes above-mentioned antenna, radio frequency unit and control unit, wherein:
Described radio frequency unit, is suitable to send the request of the identity information reading described label, and receives described The identity information of label；
Described control unit, is suitable to receive the request of the identity information that user terminal reads described label, will The identity information of the described label that described radio frequency unit sends verifies and identifies, and the institute that will identify that The identity information stating label is converted into the transmission of corresponding digital signal to described user terminal.
Alternatively, described reader also includes: aerial array and antenna switching unit, described antenna and institute State aerial array to be connected with described radio frequency unit by described antenna switching unit；
Described control unit is further adapted for controlling the switching between described antenna and described aerial array；
Described antenna switching unit, is suitable to the control signal of the antenna switching sent according to described control unit It is each turned off or sets up and described aerial array or the connection of described antenna.
Alternatively, described system also includes the second reader, described second reader respectively with described label Connect with described user terminal.
Compared with prior art, technical scheme has the advantage that
It is arranged in a mutually vertical manner by employing and disjoint first coil unit and the second coil unit, when In one coil unit and the second coil during unit input current, the magnetic field and second that first coil unit produces The magnetic field that coil unit produces is mutually perpendicular to, and can identify the label in all directions, such that it is able to carry The discrimination of high label.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of antenna in the embodiment of the present invention；
Fig. 2 is the structural representation of the first coil unit in the another kind of antenna in the embodiment of the present invention；
Fig. 3 is the structural representation of the second coil unit in the another kind of antenna in the embodiment of the present invention
Fig. 4 is the structural representation of a kind of radio-frequency recognition system in the embodiment of the present invention；
Fig. 5 is the first reader in a kind of radio-frequency recognition system in the embodiment of the present invention and user terminal Between data transmission procedure schematic diagram.
Detailed description of the invention
For solving the above-mentioned problems in the prior art, the technical scheme that the embodiment of the present invention uses is passed through Use first coil unit and the second coil unit that can produce orthogonal magnetic field in antennas, from And the label in all directions can be identified, the discrimination of label can be improved.
Understandable, below in conjunction with the accompanying drawings for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from The specific embodiment of the present invention is described in detail.
Fig. 1 shows the structural representation of a kind of antenna in the embodiment of the present invention.Sky as shown in Figure 1 Line 100, may include that
First coil unit 101 and the second coil unit 102, described first coil 101 and described second line Coil unit 102 is arranged in a mutually vertical manner and non-intersect, described first coil unit 101, described second coil list Unit 102 couples with corresponding antenna-matching circuit (not shown) the most respectively.
When input current in unit in first coil unit 101 and the second coil 102, first coil The magnetic field that the magnetic field that unit 101 produces and the second coil unit 102 produce is mutually perpendicular to, such that it is able to know Do not go out the label in all directions, such that it is able to improve the discrimination of label.
Fig. 2 and Fig. 3 respectively illustrates the first coil unit in the another kind of antenna in the embodiment of the present invention Structural representation with the second coil unit.
Shown in Figure 2, described first coil unit 201 can include first coil 201a, second Coil 201b, tertiary coil 201c and the 4th coil 201d, wherein:
Described first coil 201a is connected in series with described second coil 202b, forms first coil group, Described tertiary coil 201c is connected in series with described 4th coil 201d, forms the second coil groups, described First coil group is connected in parallel with described second coil groups.
Shown in Figure 3, described second coil unit 202 can include the 5th coil 202a, the 6th Coil 202b, the 7th coil 202c and the 8th coil 202d, wherein:
Described 5th coil 202a is connected in series with described 6th coil 202b, forms tertiary coil group； Described 7th coil 202c is connected in series with described 8th coil 202d, forms the 4th coil groups；Described Tertiary coil group is connected in parallel with described 4th coil groups.
In being embodied as, first coil 201a, the second coil 201b, tertiary coil 201c and the 4th line Enclose 201d, the 5th coil 202a, the 6th coil 202b, the 7th coil 202c and the 8th coil 202d can With identical.
Below as a example by first coil unit 201, the first coil list being discussed in detail in the embodiment of the present invention Unit 201 and the reason using above-mentioned connected mode of the second coil unit:
It is known that when described antenna includes single coil, there is not asking of the magnetic interference between coil Topic.But, when using multiple coil combination to substitute single coil, the magnetic between adjacent windings can be there is Field interference, i.e. the interference that the interference of sense of current generation and mutual inductance produce.
When adjacent two coils arrange in the same way, two coils region between two coils produces Magnetic direction is identical, strengthens each other, closes magnetic field intensity and is better than the magnetic field intensity that single coil produces.Therefore, When above-mentioned coil is combined, can will arrange according to identical magnetic direction between adjacent windings.
It is intended at first coil 201a and tertiary coil 201c two as in figure 2 it is shown, the most confirmable Coil goes out to draw respectively corresponding first lead line (not shown) and the second lead line (in figure not Illustrate) it is connected with antenna-matching circuit (not shown).In an embodiment of the present invention, first The sense of current of coil 201a is as in figure 2 it is shown, so that adjacent two coils are mutually reinforcing, by phase Can arrange according to same way between adjacent two coils that (the most adjacent sense of current in two coils is answered This is consistent), therefore, when the sense of current of first coil 201a determines, the second coil 201b, the 3rd Coil 201c and the 4th coil 201d can also decide.
After the sense of current in each coil in determining first coil unit 201, can use such as Lower method determines the connected mode between each coil:
It should be noted that different connected modes can cause the first coil in first coil unit 201 Obtain after 201a, the second coil 201b, tertiary coil 201c and the electric current of the 4th coil 201d and combination The difference of total inductance of first coil unit 201, and the electric current in each coil and first coil unit The total inductance of 201 can affect again the performance of described antenna.
According to Circuit theory, the identical inductance of M inductance value when series connection total inductance equal to single inductance M times, the electric current flowing through each inductive branch is equal to total current；The identical inductance of M inductance value is also During connection, total inductance is equal to 1/M times of single inductance, and the electric current flowing through each inductance is equal to the 1/M of total current.
Therefore, by first coil 201a, the second coil 201b, tertiary coil 201c and the 4th coil When 201d connects, the total inductance that should keep first coil unit 201 can not be excessive, in order to avoid being difficult to and phase Electric capacity in the antenna-matching circuit answered mates, again keep first coil 201a, the second coil 201b, Current value in tertiary coil 201c and the 4th coil 201d is sufficiently large, so that the center of each coil There is bigger magnetic induction to read corresponding data.
To sum up, by first coil 201a, the second coil 201b, tertiary coil 201c and the 4th coil When 201d connects, it is impossible to single use serial or parallel connection and be intended to use string the mode that combines so that In allowed limits, and each coil can correctly read and be positioned at the total inductance of first coil unit 210 The data in label on magnetic direction.In other words, it is simply that by the total inductance of first coil unit 210 Control in the range of suitably, in order to mate with corresponding antenna-matching circuit.
In being embodied as, first coil 201a in described first coil unit 201, the second coil 201b, The 5th coil 202a in tertiary coil 201c and the 4th coil 201d and described second coil unit 202, 6th coil 202b, the 7th coil 202c and the 8th coil 202d can be identical, and respectively positive direction Coil, the length of side of described square coil is described antenna maximum receiving rangeTimes.
It is why described antenna maximum receiving range by the length of side of square coilReason again is as follows:
First, according to Ampere law:
B = μ 0 i 4 πr ( cos α 2 - cos α 1 ) - - - ( 1 ) ;
Wherein, B represents magnetic induction, μ0For permeability of vacuum, r is the radius of conductor, and i is conductor In current value, α 1, α 2 are respectively the magnetic induction density B of space certain point and the angle of wire.
From formula (1), when electric current flows through one section of conductor, magnetic field, magnetic can be produced around conductor The magnetic induction of field is directly proportional to the current value flowing through conductor, is inversely proportional to the radius away from conductor.
According to Biot Savart law:
Wherein,Site is being asked to produce magnetic induction, l for current elements1-l2For path of integration, idl is electric current Unit, r is current elements to seeking the distance of site,The vector seeking site is pointed to for current elements.
Can be drawn by formula (2), be the magnetic induction density B at X in distance hub of a spool vertical dimension Size be:
B = μ 0 NR 2 2 ( R 2 + X 2 ) 3 / 2 i - - - ( 3 ) ;
Wherein, B represents magnetic induction, μ0For permeability of vacuum, X is vertical from each hub of a spool Distance, R is the length of side of each coil, and i is current value, and N is coil turn.
Below according to formula (3), R derivation is drawn:
d dR B ( R ) = μ 0 iN 2 · 2 R ( R 2 + X 2 ) 3 - 3 R 3 ( R 2 + X 2 ) ( R 2 + X 2 ) 3 - - - ( 4 ) ;
And makeThe length of side of coil when B has maximum can be calculated The magnetic induction that therein ± expression antenna produces is in two directions of propagation of the axis being perpendicular to coil.
Therefore, in order to improve the RF identification rate of coil, the length of side of described square coil can be arranged For described antenna maximum receiving rangeTimes.
Fig. 4 shows the structural representation of a kind of radio-frequency recognition system in the embodiment of the present invention.Such as Fig. 4 Shown radio-frequency recognition system, may include that label the 301, first reader 302 and user terminal 303, Reader 302 couples with label 301 and user terminal 303 respectively.
In being embodied as, the first reader 302 can include above-mentioned antenna 302a, radio frequency unit 302b With control unit 302c, wherein:
Described radio frequency unit 302b, is suitable to send the request of the identity information reading described label, and receives The identity information of described label.
Described control unit 302c, is suitable to receive user terminal 303 and reads the identity information of label 301 Request, the identity information of the label 301 sent by radio frequency unit 302b verifies and identifies, and will know The identity information of the label 301 not gone out is converted into corresponding digital signal and sends to described user terminal 303.
In being embodied as, in order to reduce cost, the first reader 302 can also include aerial array 302d With antenna switching unit 302e, antenna 302a and aerial array 302d by antenna switching unit 302e with Radio frequency unit 302b is connected, wherein:
Described control unit 302c, be further adapted for controlling described antenna 302a and described aerial array 302d it Between switching.
Described antenna switching unit 302e, is suitable to what the antenna according to the transmission of described control unit 302c switched Control signal is each turned off or sets up and aerial array 302d or the connection of antenna 302a.
In being embodied as, radio-frequency recognition system as shown in Figure 4 also include can the second reader 304, Described second reader 304 is connected with described user terminal 303.
It is to be herein pointed out the second reader 304 is reader of the prior art, its work frequency Rate is 13.56MHz.
So that the radio-frequency recognition system in the embodiment of the present invention can meet diversified demand, this Radio-frequency recognition system in a bright embodiment can include the first reader 301 and the second reader 304 simultaneously. So, user just can select to use the first reader 301 or second to read according to the actual needs Device 304 communicates with label 301 and user terminal 303.
In one embodiment of this invention, user terminal 303 and first reader the 302, second reader It is respectively adopted 458 buses between 304 to communicate, owing to 458 buses can realize the data biography of one-to-many Defeated, therefore, in order to ensure the transmission of the most reliably data, user terminal 303 can pass through 458 buses It is connected with the first reader 302 and the second reader 304 respectively.
As it is shown in figure 5, in order to ensure the reliability of data transmission, user terminal 303 and the first reader Such a way can be used between 302 to carry out information transmission:
S501, for the first time handshake phase:
User terminal 303 sends information request frame, and enters wait and answer pattern.Wherein, described information Claim frame includes the information such as the mark of user terminal 303, order, identification code.If in Preset Time, User terminal 303 does not obtains the response of the first reader 302, will again initiate to shake hands for the first time.
S502, the second handshake stage:
First reader 302, when receiving the information request frame that user terminal 303 sends, reads label The identity information of 301 also carries out CRC check, sends acknowledgement frame after verification is errorless.Wherein, described should Answer the label 301 that frame includes that the identification information of the first reader 302 and the first reader 302 read Identity information.Meanwhile, user terminal 303 by the mark+1 of self, and can enter standby mode.
S503, for the third time handshake phase:
User terminal 303, after receiving the acknowledgement frame that the first reader 301 sends, carries out CRC check. When the check results of the user terminal 303 acknowledgement frame to being received be acknowledgement frame wrong time, user terminal 303 It is again introduced into described first time handshake phase；Otherwise, user terminal 303 then resolves the acceptance of the bid of described acknowledgement frame Sign the identity information of 301.
The result of the identity information of the label 301 in user terminal 303 resolves described acknowledgement frame is described When the identity information of label 301 is wrong, user terminal 303 is again introduced into handshake phase for the first time；Otherwise, Then the identity information of the label 301 parsed is stored in local data base, and sends acknowledgement frame To the first reader 302.Wherein, the identification information+2 of the user terminal 303 in described acknowledgement frame.
First reader 302, when receiving the acknowledgement frame that user terminal 303 sends, is deleted from self The identity information of the label 301 sent in the described second handshake stage.
It is to be herein pointed out in the embodiment of the present invention the first reader 301 and user terminal 303 it Between have employed with transmission control protocol (Transmission Control Protocol, TCP) in " three times Shake hands " similar mode carries out data transmission.But, the three-way handshake in Transmission Control Protocol is used only for building Vertical connect, set up the transmission that just can carry out data after connecting, and the three-way handshake in the embodiment of the present invention Stage is directly used in the transmission of data, this data transfer mode may insure that safety that data transmit and Reliability.
One of ordinary skill in the art will appreciate that all or part of step in the various methods of above-described embodiment Suddenly the program that can be by completes to instruct relevant hardware, and this program can be stored in computer-readable In storage medium, storage medium may include that ROM, RAM, disk or CD etc..
Having been described in detail the method and system of the embodiment of the present invention above, the present invention is not limited to this. Any those skilled in the art, without departing from the spirit and scope of the present invention, all can make various change with Amendment, therefore protection scope of the present invention should be as the criterion with claim limited range.

Claims (8)

1. an antenna, it is characterised in that including: first coil unit and the second coil unit, described first Coil unit is arranged in a mutually vertical manner and non-intersect with described second coil unit, described first coil unit Couple with corresponding antenna-matching circuit respectively with described second coil unit.
Antenna the most according to claim 1, it is characterised in that described first coil unit includes First Line Circle, the second coil, tertiary coil and the 4th coil；
Described first coil is connected with described second coils connected in series, forms first coil group；
Described tertiary coil is connected with described 4th coils connected in series, forms the second coil groups；
Described first coil group is connected in parallel with described second coil groups.
Antenna the most according to claim 1 and 2, it is characterised in that described second coil unit includes: 5th coil, the 6th coil, the 7th coil and the 8th coil；
Described 5th coil is connected with described 6th coils connected in series, forms tertiary coil group；
Described 7th coil is connected with described 8th coils connected in series, forms the 4th coil groups；
Described tertiary coil group is connected in parallel with described 4th coil groups.
Antenna the most according to claim 3, it is characterised in that described first coil, described second coil, Described tertiary coil, described 4th coil, described 5th coil, described 6th coil, the described 7th Coil is identical with described 8th coil.
Antenna the most according to claim 4, it is characterised in that the length of side of described square coil is described Antenna maximum receiving rangeTimes.
6. a radio-frequency recognition system, it is characterised in that including: label, the first reader and user terminal, Described reader couples with described label and described user terminal respectively, and described first reader includes power Profit requires the antenna described in any one of 1-5, radio frequency unit and control unit, wherein:
Described radio frequency unit, is suitable to send the request of the identity information reading described label, and receives described mark The identity information signed；
Described control unit, is suitable to receive the request of the identity information that user terminal reads described label, by institute The identity information stating the described label that radio frequency unit sends verifies and identifies, and the institute that will identify that The identity information stating label is converted into the transmission of corresponding digital signal to described user terminal.
Radio-frequency recognition system the most according to claim 6, it is characterised in that described reader also includes: Aerial array and antenna switching unit, described antenna and described aerial array are single by the switching of described antenna First and described radio frequency unit is connected；
Described control unit is further adapted for controlling the switching between described antenna and described aerial array；
Described antenna switching unit, is suitable to the control signal according to the antenna that described control unit sends switches and divides Do not disconnect or set up and described aerial array or the connection of described antenna.
Radio-frequency recognition system the most according to claim 7, it is characterised in that also include the second reader, Described second reader is connected with described label and described user terminal respectively.
CN201510018901.8A 2015-01-14 2015-01-14 Antenna and radio frequency identification system Pending CN105844320A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510018901.8A CN105844320A (en) 2015-01-14 2015-01-14 Antenna and radio frequency identification system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510018901.8A CN105844320A (en) 2015-01-14 2015-01-14 Antenna and radio frequency identification system

Publications (1)

Publication Number Publication Date
CN105844320A true CN105844320A (en) 2016-08-10

Family

ID=56579952

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510018901.8A Pending CN105844320A (en) 2015-01-14 2015-01-14 Antenna and radio frequency identification system

Country Status (1)

Country Link
CN (1) CN105844320A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109361058A (en) * 2018-11-30 2019-02-19 公安部第研究所 A kind of antenna of remote recognition label

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101394022A (en) * 2008-10-28 2009-03-25 江苏大学 Antenna design method expanding reading scope of low frequency and high frequency RFID system
CN101655906A (en) * 2009-09-09 2010-02-24 东莞市太平洋计算机科技有限公司 Receiving method of ultrahigh frequency RFID label signal and reader thereof
CN201867861U (en) * 2010-12-03 2011-06-15 中山达华智能科技股份有限公司 RFID (Radio Frequency Identification Device) multi-dimensional identification electronic tag
CN202453914U (en) * 2011-12-14 2012-09-26 深圳日海通讯技术股份有限公司 RFID (radio frequency identification) tag read-write device
CN102959800A (en) * 2010-09-07 2013-03-06 株式会社村田制作所 Antenna apparatus and communication terminal apparatus
CN103811872A (en) * 2012-11-12 2014-05-21 财团法人车辆研究测试中心 Magnetic field centralization configuration antenna
CN103825100A (en) * 2014-03-12 2014-05-28 深圳市麦捷微电子科技股份有限公司 Antenna and radio frequency identification (RFID) module
JP5526932B2 (en) * 2010-03-30 2014-06-18 株式会社村田製作所 ANTENNA MODULE, ANTENNA DEVICE, AND MOBILE COMMUNICATION TERMINAL

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101394022A (en) * 2008-10-28 2009-03-25 江苏大学 Antenna design method expanding reading scope of low frequency and high frequency RFID system
CN101655906A (en) * 2009-09-09 2010-02-24 东莞市太平洋计算机科技有限公司 Receiving method of ultrahigh frequency RFID label signal and reader thereof
JP5526932B2 (en) * 2010-03-30 2014-06-18 株式会社村田製作所 ANTENNA MODULE, ANTENNA DEVICE, AND MOBILE COMMUNICATION TERMINAL
CN102959800A (en) * 2010-09-07 2013-03-06 株式会社村田制作所 Antenna apparatus and communication terminal apparatus
CN201867861U (en) * 2010-12-03 2011-06-15 中山达华智能科技股份有限公司 RFID (Radio Frequency Identification Device) multi-dimensional identification electronic tag
CN202453914U (en) * 2011-12-14 2012-09-26 深圳日海通讯技术股份有限公司 RFID (radio frequency identification) tag read-write device
CN103811872A (en) * 2012-11-12 2014-05-21 财团法人车辆研究测试中心 Magnetic field centralization configuration antenna
CN103825100A (en) * 2014-03-12 2014-05-28 深圳市麦捷微电子科技股份有限公司 Antenna and radio frequency identification (RFID) module

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109361058A (en) * 2018-11-30 2019-02-19 公安部第研究所 A kind of antenna of remote recognition label
CN109361058B (en) * 2018-11-30 2024-04-02 公安部第一研究所 Antenna for remote tag identification

Similar Documents

Publication Publication Date Title
CN108055089B (en) Method and device for determining working frequency of NFC device
US20160126639A1 (en) Coil structure and wireless power receiving apparatus including the same
KR20090061584A (en) Communication apparatus
JP2011029799A (en) Contactless power supplying communication apparatus, contactless power receiving communication device, power-supplying communication control method, and power receiving communication control method
CN1996349A (en) Repeaters for RFID systems and communication processing device
CN102017438A (en) Radio frequency communication device and method for operating the same
US7692602B2 (en) Control system of antenna array of RFID reader applications
CN103577857A (en) RFID three-dimensional detecting device and use method thereof
JP2007199871A (en) Non-contact ic card reader device
EP1845630B1 (en) Rfid carrier sense method and rfid system using the same
CN107210786A (en) Receiver and communication system
US20120139712A1 (en) Hybrid switch for extending antenna port and method of controlling the same, and rfid system using the hybrid switch
EP2234206A1 (en) Loop antenna unit
CN103294974A (en) Identifying and sending method, sending device and identifying system for radio-frequency signals
CN103886359A (en) Mobile phone card with radio frequency identification function
CN105844320A (en) Antenna and radio frequency identification system
JP2008301241A (en) Loop antenna and radio transmitter/receiver with loop antenna
KR20200002807A (en) Communication device and method
CN110969782A (en) Non-card-receiving card reading method for POS machine
CN105868810A (en) NFC reader-writer interface for optimizing energy acquisition and mini antenna
JP2010039850A (en) Wireless transmission and reception apparatus and wireless transmission and reception method
CN112688720B (en) Near field communication equipment and method for determining transmitting power
WO2016107260A1 (en) Method and dual-frequency card reader for preventing collision between cards with different frequencies
CN104704748B (en) Amplifier circuit, Anneta module and radio communication device
CN102955923B (en) A kind of method and device preventing communication contention aware

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20160810

RJ01 Rejection of invention patent application after publication