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 PDFInfo
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- 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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- 230000010363 phase shift Effects 0.000 claims abstract description 25
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods 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
- G06K7/10118—Methods 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
- G06K7/10148—Methods 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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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
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.
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| CN201610805330.7A CN106650526B (en) | 2016-09-06 | 2016-09-06 | Phase converter, carrier wave suppression circuit and radio-frequency identification reader/writer |
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| CN201610805330.7A CN106650526B (en) | 2016-09-06 | 2016-09-06 | Phase converter, carrier wave suppression circuit and radio-frequency identification reader/writer |
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| 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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