CN106650526B - Phase converter, carrier wave suppression circuit and radio-frequency identification reader/writer - Google Patents

Phase converter, carrier wave suppression circuit and radio-frequency identification reader/writer Download PDF

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Publication number
CN106650526B
CN106650526B CN201610805330.7A CN201610805330A CN106650526B CN 106650526 B CN106650526 B CN 106650526B CN 201610805330 A CN201610805330 A CN 201610805330A CN 106650526 B CN106650526 B CN 106650526B
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phase
radio
capacitor
inductance
switch
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CN106650526A (en
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李远龙
夏立军
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Shenzhen Clou Electronics Co Ltd
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Shenzhen Clou Electronics Co Ltd
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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06KGRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10118Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the sensing being preceded by at least one preliminary step
    • G06K7/10148Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the sensing being preceded by at least one preliminary step the step consisting of dynamically tuning the resonant circuit of the interrogation device that is emitting the interrogation signal, e.g. for impedance matching inside of the interrogation device

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • General Health & Medical Sciences (AREA)
  • Artificial Intelligence (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

The present invention relates to a kind of phase converter, carrier wave suppression circuit and radio-frequency identification reader/writers.The phase converter includes: splitter, for input signal to be divided into the output signal identical with input signal of two-way or more;Phase path unit is connect with the output end of the splitter, and the phase shift for the output signal more than two-way to be carried out to multichannel is handled;Wherein the phase shift processing in each channel obtains the signal of an out of phase;Channel selection unit, for controlling the opening and closing in channel in the phase path unit, to obtain the signal of selected phase.The carrier wave suppression circuit includes the phase converter.The radio-frequency identification reader/writer includes the carrier wave suppression circuit.

Description

Phase converter, carrier wave suppression circuit and radio-frequency identification reader/writer
Technical field
The present invention relates to technical field of RFID, more particularly to a kind of phase converter, carrier wave suppression circuit and penetrate Frequency identification reader.
Background technique
Ultrahigh-frequency radio-frequency identification system mainly includes reader, antenna and electronic tag, when radio-frequency recognition system work, Radiofrequency signal is emitted by antenna by reader, label is persistently energized, to guarantee that label can work normally.In the process, Label echo coexists with transmitting leakage carrier wave in reader receiving channel, this will keep the signal for being input to receiver excessive, cause Receiver enters nonlinear operation area even barrage reception channel, in order to reduce or reduce transmitting carrier wave leakage power to receiver Influence, receive circuit input terminal be added carrier wave cancellation circuit, carrier wave cancellation circuit mainly by amplitude adjustment and phase become Parallel operation composition, equal using an amplitude, carrier wave leakage power is determined in the 180 ° of carrier signal counteractings of phase phase difference, reduces transmitting carrier wave Influence of the leakage signal to receiver performance.
In order to reduce influence of the leakage carrier signal to receiver, while meeting the reading of RFID full frequency band 840-960MHz bandwidth Write device application.It is required that phase converter must adapt to the variation of full range band frequency adjustment, i.e. phse conversion in carrier wave cancellation circuit Device adapts to antenna port impedance variation at different frequencies, while phase converter must be able to quickly be adjusted to corresponding phase angle Degree.
Since phase converter will meet the phase change of full range band frequency, the phase-shifting amplitude-modulated control of single channel is such as used, is started With 360 degree for a cycle, 10 degree carry out coarse scan for radius, find close to after the phase angle of minimum power, then with 1 degree Careful scanning is carried out for stepping, such a process need to may just expend 200 milliseconds or so of time.
Summary of the invention
Based on this, it is necessary to provide a kind of phase converter that can be quickly adjusted to required phase angle.
A kind of phase converter, comprising:
Splitter, for input signal to be divided into the output signal identical with input signal of two-way or more;
Phase path unit is connect with the output end of the splitter, for by the output signal more than two-way into The phase shift of row multichannel is handled;Wherein the phase shift processing in each channel obtains the signal of an out of phase;
Channel selection unit, for controlling the opening and closing in channel in the phase path unit, to obtain the letter of selected phase Number.
The phase path unit includes with the output signal quantity same number in one of the embodiments, One RF switch and the second RF switch;First RF switch and the second RF switch include the first radio-frequency head, second Radio-frequency head and third radio-frequency head;First RF switch and the second RF switch can be made the first radio-frequency head and second by control Radio-frequency head connection, or it is connected to the first radio-frequency head with third radio-frequency head;
First radio-frequency head of each first RF switch inputs radiofrequency signal all the way and the second radio-frequency head and third are penetrated Frequency end is separately connected the input terminal of a phase-shifting unit;
The output end for being connected to two phase-shifting units of same first RF switch is connected respectively to same second radio frequency and opens The second radio-frequency head and third radio-frequency head closed;
An output end of first radio-frequency head of each second RF switch as phase path unit.
The output of first radio-frequency head of each first RF switch and the splitter in one of the embodiments, End connection.
The output of first radio-frequency head of each first RF switch and the splitter in one of the embodiments, A phase-shifting unit is connected between end.
In one of the embodiments, the output signal of the splitter be two-way, wherein all the way output signal be input to- 45 ° of phase-shifting units, another output signal are input to 45 ° of phase-shifting units, the second radio-frequency head of each first RF switch and Three radio-frequency heads are separately connected -90 ° of phase-shifting units and 90 ° of phase-shifting units.
- 45 ° of phase-shifting units include first capacitor, the first inductance and the second capacitor, institute in one of the embodiments, State first capacitor one end ground connection, the other end is connect with one end of the first inductance, the other end and the second capacitor of first inductance One end connection, second capacitor the other end ground connection;The common end of the first capacitor and the first inductance is -45 ° of phase shifts The common end of the input terminal of unit, second capacitor and the first inductance is the output end of -45 ° of phase-shifting units;
45 ° of phase-shifting units include the second inductance, third capacitor and third inductance, a termination of second inductance The one end on ground, the other end and third capacitor connects, and the other end of the third capacitor is connect with one end of third inductance, and described the The other end of three inductance is grounded;The common end of the third capacitor and the second inductance is the input terminal of 45 ° of phase-shifting units, described the The common end of three capacitors and third inductance is the output end of 45 ° of phase-shifting units;
- 90 ° of phase-shifting units include the 4th capacitor, the 4th inductance and the 5th capacitor, one end of the 4th capacitor and One end connect and ground of 5th capacitor, the other end of the 4th capacitor and the other end of the 5th capacitor are separately connected the 4th electricity The both ends of sense;The common end of 4th capacitor and the 4th inductance be -90 ° of phase-shifting units input terminal, the 5th capacitor and The common end of 4th inductance is the output end of -90 ° of phase-shifting units;
90 ° of phase-shifting units include the 5th inductance, the 6th capacitor and the 6th inductance, one end of the 5th inductance and the One end connect and ground of six inductance, the other end of the 5th inductance and the other end of the 6th inductance are separately connected the 6th capacitor Both ends;The common end of 6th capacitor and the 5th inductance is the input terminal of 90 ° of phase-shifting units, the 6th capacitor and the 6th The common end of inductance is the output end of 90 ° of phase-shifting units.
Each first RF switch and the second RF switch are equipped with the first logic control in one of the embodiments, End processed and the second logic control end, and when first logic control end input high level, the first radio-frequency head and the second radio frequency End connection;When second logic control end input high level, the first radio-frequency head is connected to third radio-frequency head.
In one of the embodiments, further include combiner, the first radio-frequency head of each second RF switch with it is described One input terminal of combiner connects.
A kind of carrier wave suppression circuit, including above-mentioned phase converter.
A kind of radio-frequency identification reader/writer, including signal receiving circuit and above-mentioned carrier wave suppression circuit, the signal is received Circuit is connect with carrier wave suppression circuit.
Input signal is separated the output signal of two-way or more by above-mentioned phase converter, and respectively in different channels Phase shift processing is carried out, phase shift channel can be quickly selected by channel selection unit, realizes that phase is switched fast simultaneously in interchannel It is accurately positioned.
Above-mentioned carrier wave suppression circuit can position and be adjusted to quickly to need the phase of suppressed carrier.
Above-mentioned radio-frequency identification reader/writer can handle carrier wave with faster speed and inhibit.
Detailed description of the invention
Fig. 1 is the phase converter module of an embodiment;
Fig. 2 is a kind of modular structure of phase path unit in Fig. 1;
Fig. 3 is another modular structure of phase path unit in Fig. 1;
Fig. 4 is the phase converter of a specific embodiment mode;
Fig. 5 a is -45 ° of phase-shifting units;
Fig. 5 b is 45 ° of phase-shifting units;
Fig. 5 c is -90 ° of phase-shifting units;
Fig. 5 d is 90 ° of phase-shifting units.
Specific embodiment
It is further described below in conjunction with drawings and examples.
As shown in Figure 1, the phase converter of an embodiment includes splitter 100, phase path unit 200 and channel selecting Unit 300.Splitter 100 is used to for input signal being divided into the output signal identical with input signal of two-way or more.Phase is logical Road unit 200 is connect with the output end of splitter 100, for the output signal more than two-way to be carried out to the phase shift of multichannel Processing;Wherein the phase shift processing in each channel obtains the signal of an out of phase.Channel selection unit 300 is for controlling phase The opening and closing in channel in channel unit 200, to obtain the signal of selected phase.
As shown in Fig. 2, phase path unit 200 includes the first RF switch with the output signal quantity same number 210 and second RF switch 220.I.e. the quantity of output signal is n, is n, the second radio frequency for the quantity of the first RF switch 210 The quantity of switch 220 is also n.
First RF switch 210 and the second RF switch 220 include the first radio-frequency head RF1, the second radio-frequency head RF2 and the Three radio-frequency head RF3.First RF switch 210 and the second RF switch 220 can be made the first radio-frequency head RF1 and by control Two radio-frequency head RF2 connection, or it is connected to the first radio-frequency head RF1 with third radio-frequency head RF3.When the first radio-frequency head RF1 is penetrated with second When frequency end RF2 is connected to, the signal inputted from the first radio-frequency head RF1 can be exported from the second radio-frequency head RF2;When the first radio-frequency head When RF1 is connected to third radio-frequency head RF3, the signal inputted from the first radio-frequency head RF1 can be exported from third radio-frequency head RF3.
First radio-frequency head RF1 of each first RF switch 210 inputs radiofrequency signal and the second radio-frequency head all the way RF2 and third radio-frequency head RF3 is separately connected the input terminal of a phase-shifting unit 230.It is connected to same first RF switch 210 The output end of two phase-shifting units 230 is connected respectively to the second radio-frequency head RF2 and third radio frequency of same second RF switch 220 Hold RF3.An output end of the first radio-frequency head RF1 of each second RF switch 220 as phase path unit 200.
In one embodiment, the first radio-frequency head RF1 of each first RF switch 210 can directly and splitter 100 output end connection.The output signal of splitter 100 in this way is admitted to the first RF switch 210, and in the first radio frequency Switch 210 is connected to different phase-shifting units 230 by control.This requires the phase of the phase shift of different phase-shifting units 230 is each It is not identical.
In one embodiment, with reference to Fig. 3, the first radio-frequency head RF1 of each first RF switch 210 with described point A phase-shifting unit 240 is connected between the output end of road device 100.The output signal of splitter 100 is penetrated being admitted to first in this way Before frequency switch 210, phase shift processing is first passed through, is then connected to different shiftings by control in the first RF switch 210 again Phase element 230.The phase of the mutual phase shift of phase-shifting unit 230 can be identical, by the cooperation with phase-shifting unit 240, finally Obtain the signal of multiple and different phases.
It is appreciated that above-mentioned phase-shifting unit and RF switch can also laterally or longitudinally extend, to realize that more multichannel is moved Phase channel.
Two-way output signal, and the tool of the signal by two layers of phase shift, four outs of phase of acquisition are separated with splitter below For body circuit, phase converter is specifically described.
As shown in figure 4, the splitter of the phase converter of an embodiment uses chip U1, two-way output signal is separated, Wherein output signal is input to -45 ° of phase-shifting units all the way, another output signal is input to 45 ° of phase-shifting units.- 45 ° of phase shift lists The output end of member connects the first radio-frequency head of first RF switch (using chip U2);The output end of 45 ° of phase-shifting units connects Connect the first radio-frequency head of first RF switch (using chip U3).The second radio-frequency head and third radio-frequency head of chip U2, U3 It is respectively coupled -90 ° of phase-shifting units and 90 ° of phase-shifting units.
As shown in figure 4, each first RF switch and the second RF switch be equipped with the first logic control end (A) and Second logic control end (B), and when first logic control end input high level, the first radio-frequency head and the second radio-frequency head connect It is logical;When second logic control end input high level, the first radio-frequency head is connected to third radio-frequency head.Circuit shown in Fig. 4 In, the first logic control end (A) of chip U2, U4 input switch signal SW1, second logic control end (B) equal input switch Signal SW2.The first logic control end (A) of chip U3, U5 input switch signal SW3, the second logic control end (B) inputs Switching signal SW4.
When switching signal SW1 is high level, the phase shift channel that -45 ° of phase-shifting units are combined with 90 ° of phase-shifting units is beaten It opens, output signal ultimately generates the signal of 45 ° of phase shifts.When switching signal SW2 is high level, -45 ° of phase-shifting units and -90 ° of shiftings The phase shift channel of phase element combination is opened, and output signal ultimately generates the signal of -135 ° of phase shifts.When switching signal SW3 is height When level, the phase shift channel that 45 ° of phase-shifting units are combined with 90 ° of phase-shifting units is opened, and output signal ultimately generates 135 ° of phase shifts Signal.When switching signal SW4 is high level, the phase shift channel that 45 ° of phase-shifting units are combined with -90 ° of phase-shifting units is opened, Output signal ultimately generates the signal of -45 ° of phase shifts.
Above-mentioned phase converter is quickly arranged by logic control level, and it is simultaneously quasi- to realize that phase is switched fast in interchannel Determine position.Particularly, phase change of the phase converter especially suitable for RFID full frequency band 840MHz-960MHz frequency.
Specifically, as shown in Figure 5 a, -45 ° of phase-shifting units include first capacitor C1, the first inductance L1 and the second capacitor C2, the one end first capacitor C1 ground connection, the other end are connect with one end of the first inductance L1, the other end of the first inductance L1 It is connect with one end of the second capacitor C2, the other end ground connection of the second capacitor C2;The first capacitor C1 and the first inductance L1 Common end be the common end of the input terminal of -45 ° of phase-shifting units, the second capacitor C2 and the first inductance L1 be -45 ° of phase shift lists The output end of member;
As shown in Figure 5 b, 45 ° of phase-shifting units include the second inductance L2, third capacitor C3 and third inductance L3, described One end ground connection of second inductance L2, one end of the other end and third capacitor C3 connect, the other end of the third capacitor C3 and the One end of three inductance L3 connects, the other end ground connection of the third inductance L3;The public affairs of the third capacitor C3 and the second inductance L2 End is the defeated of 45 ° of phase-shifting units for the common end of the input terminal of 45 ° of phase-shifting units, the third capacitor C3 and third inductance L3 altogether Outlet;
As shown in Figure 5 c, -90 ° of phase-shifting units include the 4th capacitor C4, the 4th inductance L4 and the 5th capacitor C5, described One end of 4th capacitor C4 and one end connect and ground of the 5th capacitor C5, the other end and the 5th capacitor of the 4th capacitor C4 The other end of C5 is separately connected the both ends of the 4th inductance L4;The common end of the 4th capacitor C4 and the 4th inductance L4 is -90 ° of shiftings The input terminal of phase element, the common end of the 5th capacitor C5 and the 4th inductance L4 are the output end of -90 ° of phase-shifting units;
As fig 5d, 90 ° of phase-shifting units include the 5th inductance L5, the 6th capacitor C6 and the 6th inductance L6, described One end of 5th inductance L5 and one end connect and ground of the 6th inductance L6, the other end and the 6th inductance of the 5th inductance L5 The other end of L6 is separately connected the both ends of the 6th capacitor C6;The common end of the 6th capacitor C6 and the 5th inductance L5 is 90 ° of shiftings The input terminal of phase element, the common end of the 6th capacitor C6 and the 6th inductance L6 are the output end of 90 ° of phase-shifting units.
Further, with reference to Fig. 1 and Fig. 2, the phase converter of above-described embodiment further includes combiner 400, and each second First radio-frequency head RF1 of RF switch 220 is connect with an input terminal of combiner 400.
Based on above-mentioned phase converter, a kind of carrier wave suppression circuit can be constructed.The carrier wave suppression circuit can be quickly Position and be adjusted to required phase.When the phase converter is positioned and eliminated for carrier wave, to reach the mesh quickly positioned , the quantity in the channel is within 8, to reduce the time of switching channel and scanning.
A kind of radio-frequency identification reader/writer, including signal receiving circuit and above-mentioned carrier wave suppression circuit, the signal is received Circuit is connect with carrier wave suppression circuit.The radio-frequency identification reader/writer can handle carrier wave with faster speed and inhibit.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.

Claims (8)

1. a kind of phase converter characterized by comprising
Splitter, for input signal to be divided into the output signal identical with input signal of two-way or more;
Phase path unit is connect with the output end of the splitter, more for carrying out the output signal more than two-way The phase shift in channel is handled;Wherein the phase shift processing in each channel obtains the signal of an out of phase;
Channel selection unit, for controlling the opening and closing in channel in the phase path unit, to obtain the signal of selected phase;
The phase path unit includes opening with the first RF switch of the output signal quantity same number and the second radio frequency It closes;First RF switch and the second RF switch include the first radio-frequency head, the second radio-frequency head and third radio-frequency head;It is described First RF switch and the second RF switch can be such that the first radio-frequency head is connected to the second radio-frequency head by control, or make the first radio frequency End is connected to third radio-frequency head;
First radio-frequency head of each first RF switch inputs radiofrequency signal and the second radio-frequency head and third radio-frequency head all the way It is separately connected the input terminal of a phase-shifting unit;
The output end for being connected to two phase-shifting units of same first RF switch is connected respectively to same second RF switch Second radio-frequency head and third radio-frequency head;
An output end of first radio-frequency head of each second RF switch as phase path unit;
Each first RF switch and the second RF switch are equipped with the first logic control end and the second logic control end, and When first logic control end input high level, the first radio-frequency head and the connection of the second radio-frequency head;When the second logic control When end input high level processed, the first radio-frequency head is connected to third radio-frequency head.
2. phase converter according to claim 1, which is characterized in that the first radio frequency of each first RF switch End is connect with the output end of the splitter.
3. phase converter according to claim 1, which is characterized in that the first radio frequency of each first RF switch A phase-shifting unit is connected between end and the output end of the splitter.
4. phase converter according to claim 3, which is characterized in that the output signal of the splitter is two-way, In output signal is input to -45 ° of phase-shifting units all the way, another output signal is input to 45 ° of phase-shifting units, each first radio frequency The second radio-frequency head and third radio-frequency head of switch are separately connected -90 ° of phase-shifting units and 90 ° of phase-shifting units.
5. phase converter according to claim 4, which is characterized in that -45 ° of phase-shifting units include first capacitor, First inductance and the second capacitor, first capacitor one end ground connection, the other end are connect with one end of the first inductance, first electricity The other end of sense is connect with one end of the second capacitor, the other end ground connection of second capacitor;The first capacitor and the first electricity The common end of sense is that the common end of the input terminal of -45 ° of phase-shifting units, second capacitor and the first inductance is -45 ° of phase-shifting units Output end;
45 ° of phase-shifting units include the second inductance, third capacitor and third inductance, and one end of second inductance is grounded, is another One end is connect with one end of third capacitor, and the other end of the third capacitor is connect with one end of third inductance, the third electricity The other end of sense is grounded;The common end of the third capacitor and the second inductance is the input terminal of 45 ° of phase-shifting units, third electricity Hold and the common end of third inductance is the output end of 45 ° of phase-shifting units;
- 90 ° of phase-shifting units include the 4th capacitor, the 4th inductance and the 5th capacitor, one end and the 5th of the 4th capacitor One end connect and ground of capacitor, the other end of the 4th capacitor and the other end of the 5th capacitor are separately connected the 4th inductance Both ends;The common end of 4th capacitor and the 4th inductance is the input terminal of -90 ° of phase-shifting units, the 5th capacitor and the 4th The common end of inductance is the output end of -90 ° of phase-shifting units;
90 ° of phase-shifting units include the 5th inductance, the 6th capacitor and the 6th inductance, one end of the 5th inductance and the 6th electricity One end connect and ground of sense, the other end of the 5th inductance and the other end of the 6th inductance are separately connected the two of the 6th capacitor End;The common end of 6th capacitor and the 5th inductance is the input terminal of 90 ° of phase-shifting units, the 6th capacitor and the 6th inductance Common end be 90 ° of phase-shifting units output end.
6. phase converter according to claim 1, which is characterized in that it further include combiner, each second RF switch The first radio-frequency head connect with an input terminal of the combiner.
7. a kind of carrier wave suppression circuit, including the described in any item phase converters of claim 1~6.
8. a kind of radio-frequency identification reader/writer, including signal receiving circuit and carrier wave suppression circuit as claimed in claim 7, the letter Number receive circuit connect with carrier wave suppression circuit.
CN201610805330.7A 2016-09-06 2016-09-06 Phase converter, carrier wave suppression circuit and radio-frequency identification reader/writer Active CN106650526B (en)

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Publication number Priority date Publication date Assignee Title
CN2562496Y (en) * 2002-08-15 2003-07-23 信息产业部电子第五十五研究所 Phase shifter of miniature radio-frequency mechanism system
US20060098765A1 (en) * 2004-11-05 2006-05-11 Impinj, Inc. Interference cancellation in RFID systems
CN101425823A (en) * 2007-11-01 2009-05-06 西门子公司 Self-interference signal eliminating apparatus and method and RFID reader-writer
CN101202369B (en) * 2007-12-11 2011-12-07 中国电子科技集团公司第五十五研究所 Miniature MEMS switching line phase shifter
US8340581B2 (en) * 2008-11-13 2012-12-25 Alien Technology Corporation Noise cancellation for RFID backscatter
CN102055049B (en) * 2010-10-19 2013-07-17 电子科技大学 360-degree radio-frequency simulated electrical modulation phase shifter of lumped element
CN202093524U (en) * 2011-05-09 2011-12-28 中兴通讯股份有限公司 Radio frequency identification (RFID) device

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