CN106650526A - Phase converter, carrier suppression circuit and radio frequency identification reader - Google Patents
Phase converter, carrier suppression circuit and radio frequency identification reader Download PDFInfo
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- CN106650526A CN106650526A CN201610805330.7A CN201610805330A CN106650526A CN 106650526 A CN106650526 A CN 106650526A CN 201610805330 A CN201610805330 A CN 201610805330A CN 106650526 A CN106650526 A CN 106650526A
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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
Abstract
The invention relates to a phase converter, a carrier suppression circuit and a radio frequency identification reader. The phase converter comprises a splitter, a phase channel unit and a channel selection unit, and is characterized in that the splitter is used for splitting input signals into more than two paths of output signals which are identical to the input signals; the phase channel unit is connected with an output end of the splitter and used for performing multi-channel phase-shifting processing on the more than two paths of output signals, wherein phase-shafting processing of each channel acquires a signal with a different phase; and the channel selection unit is used for controlling open-close of channels in the phase channel unit so as to acquire signals with a selected phase. The carrier suppression circuit comprises the phase converter. The radio frequency identification reader comprises the carrier 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 read write line.
Background technology
Ultrahigh-frequency radio-frequency identification system mainly includes read write line, antenna and electronic tag, when radio-frequency recognition system works,
Radiofrequency signal is launched by antenna by read write line, energy supply is continued to label, to ensure label energy normal work.In the process,
Label echo is revealed carrier wave and is coexisted with transmitting in read write line receiving channel, and this is excessive by the signal for making input to receiver, causes
Receiver enters nonlinear operation area even barrage reception passage, in order to reduce or reducing transmitting carrier wave leakage power to receiver
Impact, receiving circuit input add carrier wave cancellation circuit, carrier wave cancellation circuit mainly by amplitude adjustment and phase place become
Parallel operation is constituted, equal using an amplitude, and 180 ° of carrier signals of phase are offset and determine carrier wave leakage power, reduces transmitting carrier wave
Impact of the leakage signal to receiver performance.
In order to reduce revealing impact of the 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 change that full range band frequency is adjusted, i.e. phse conversion in carrier wave cancellation circuit
Device adapts to antenna port impedance change at different frequencies, while phase converter must be able to quickly be adjusted to corresponding phase angle
Degree.
Because phase converter will meet the phase place change of full range band frequency, the phase-shifting amplitude-modulated control of single channel is such as adopted, started
With 360 degree as a cycle, 10 degree carry out coarse scan for radius, after finding the phase angle of close minimum power, then with 1 degree
Careful scanning is carried out for stepping, such a flow process just may need to expend 200 milliseconds or so of time.
The content of the invention
Based on this, it is necessary to provide a kind of phase converter that can be quickly adjusted to desired phase angle.
A kind of phase converter, including：
Shunt, for by input signal be divided into it is more than two-way with input signal identical output signal；
Phase path unit, is connected with the output end of the shunt, for the output signal more than two-way to be entered
The multichannel phase shift of row is processed；The wherein phase shift of each passage processes the signal for obtaining an out of phase；
Channel selection unit, for controlling the phase path unit in passage opening and closing, to obtain the letter of selected phase place
Number.
Wherein in one embodiment, the phase path unit includes with the output signal quantity same number
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 the 3rd radio-frequency head；First RF switch and the second RF switch can make the first radio-frequency head and second by control
Radio-frequency head is connected, or the first radio-frequency head is connected with the 3rd radio-frequency head；
First radio-frequency head of each first RF switch is input into radiofrequency signal all the way and the second radio-frequency head and the 3rd is penetrated
Frequency end connects respectively the input 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 for closing and the 3rd radio-frequency head；
An output end of first radio-frequency head of each the second RF switch as phase path unit.
Wherein in one embodiment, the first radio-frequency head of each first RF switch and the output of the shunt
End connection.
Wherein in one embodiment, the first radio-frequency head of each first RF switch and the output of the shunt
Connect a phase-shifting unit between end.
Wherein in one embodiment, the output signal of the shunt is two-way, wherein all the way output signal be input to-
45 ° of phase-shifting units, another road output signals are input to 45 ° of phase-shifting units, the second radio-frequency head of each the first RF switch and
Three radio-frequency heads connect respectively -90 ° of phase-shifting units and 90 ° of phase-shifting units.
Wherein in one embodiment, -45 ° of phase-shifting units include the first electric capacity, the first inductance and the second electric capacity, institute
State first electric capacity one end ground connection, the other end to be connected with one end of the first inductance, the other end and the second electric capacity of first inductance
One end connection, second electric capacity the other end ground connection；The common port of first electric capacity and the first inductance is -45 ° of phase shifts
The common port of the input of unit, second electric capacity and the first inductance is the output end of -45 ° of phase-shifting units；
45 ° of phase-shifting units include the second inductance, the 3rd electric capacity and the 3rd inductance, a termination of second inductance
Ground, the other end are connected with one end of the 3rd electric capacity, and the other end of the 3rd electric capacity is connected with one end of the 3rd inductance, and described the
The other end ground connection of three inductance；The common port of the 3rd electric capacity and the second inductance be the input of 45 ° of phase-shifting units, described
The common port of three electric capacity and the 3rd inductance is the output end of 45 ° of phase-shifting units；
- 90 ° of phase-shifting units include the 4th electric capacity, the 4th inductance and the 5th electric capacity, one end of the 4th electric capacity and
One end of 5th electric capacity connects and is grounded, and it is electric that the other end of the 4th electric capacity and the other end of the 5th electric capacity connect respectively the 4th
The two ends of sense；The common port of the 4th electric capacity and the 4th inductance is the input of -90 ° of phase-shifting units, the 5th electric capacity and
The common port of the 4th inductance is the output end of -90 ° of phase-shifting units；
90 ° of phase-shifting units include the 5th inductance, the 6th electric capacity and the 6th inductance, one end of the 5th inductance and the
One end of six inductance connects and is grounded, and the other end of the 5th inductance and the other end of the 6th inductance connect respectively the 6th electric capacity
Two ends；The common port of the 6th electric capacity and the 5th inductance is the input of 90 ° of phase-shifting units, the 6th electric capacity and the 6th
The common port of inductance is the output end of 90 ° of phase-shifting units.
Wherein in one embodiment, each described first RF switch and the second RF switch are equipped with the first logic control
End processed and the second logic control end, and when the first logic control end input high level, the first radio-frequency head and the second radio frequency
End connection；When the second logic control end input high level, the first radio-frequency head and the 3rd radio-frequency head are connected.
Wherein in one embodiment, also including combiner, the first radio-frequency head of each the second RF switch with it is described
One input connection of combiner.
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 connected with carrier wave suppression circuit.
Above-mentioned phase converter, by input signal output signal more than two-way is separated, and respectively in different passages
Phase shift process is carried out, phase shift passage can quickly be selected by channel selection unit, realize that phase place is switched fast simultaneously in interchannel
It is accurately positioned.
Above-mentioned carrier wave suppression circuit can quickly position and be adjusted to need the phase place of suppressed carrier.
Above-mentioned radio-frequency identification reader/writer can be suppressed with velocity process carrier wave faster.
Description of the drawings
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 kind of modular structure of phase path unit in Fig. 1；
Fig. 4 is the phase converter of a specific embodiment mode；
Fig. 5 a are -45 ° of phase-shifting units；
Fig. 5 b are 45 ° of phase-shifting units；
Fig. 5 c are -90 ° of phase-shifting units；
Fig. 5 d are 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 shunt 100, phase path unit 200 and channel selecting
Unit 300.Shunt 100 be used for by input signal be divided into it is more than two-way with input signal identical output signal.Phase place is led to
Road unit 200 is connected with the output end of shunt 100, for the output signal more than two-way to be carried out into multichannel phase shift
Process；The wherein phase shift of each passage processes the signal for obtaining an out of phase.Channel selection unit 300 is used to control phase place
The opening and closing of passage in channel unit 200, to obtain the signal of selected phase place.
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 be n, be the first RF switch 210 quantity be n, the second radio frequency
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.The RF switch 220 of first RF switch 210 and second can make the first radio-frequency head RF1 and by control
Two radio-frequency head RF2 are connected, or the first radio-frequency head RF1 is connected with the 3rd radio-frequency head RF3.When the first radio-frequency head RF1 is penetrated with second
When frequency end RF2 is connected, can export from the second radio-frequency head RF2 from the signal of the first radio-frequency head RF1 inputs；When the first radio-frequency head
When RF1 is connected with the 3rd radio-frequency head RF3, can export from the 3rd radio-frequency head RF3 from the signal of the first radio-frequency head RF1 inputs.
First radio-frequency head RF1 of each first RF switch 210 is input into radiofrequency signal and the second radio-frequency head all the way
RF2 and the 3rd radio-frequency head RF3 connect respectively the input 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 the 3rd radio frequency of same second RF switch 220
End RF3.An output ends of the first radio-frequency head RF1 of each the 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 shunt
100 output end connection.The output signal of so shunt 100 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 that the phase place of the phase shift of different phase-shifting units 230 is each
Differ.
In one embodiment, with reference to Fig. 3, the first radio-frequency head RF1 of each first RF switch 210 with described point
Connect a phase-shifting unit 240 between the output end of road device 100.So the output signal of shunt 100 is penetrated being admitted to first
Before frequency switch 210, phase shift process is first passed through, then in the first RF switch 210 different shiftings are connected to by control again
Facies unit 230.The phase place of the phase shift each other of phase-shifting unit 230 can be with identical, by the cooperation with phase-shifting unit 240, finally
Obtain the signal of multiple outs of phase.
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 passage.
Hereinafter two-way output signal is separated with shunt, and the tool of the signal of four outs of phase is obtained through two-layer phase shift
As a example by body circuit, phase converter is specifically described.
As shown in figure 4, the shunt of the phase converter of an embodiment adopts chip U1, it separates two-way output signal,
Wherein all the way output signal is input to -45 ° of phase-shifting units, another road output signal and is input to 45 ° of phase-shifting units.- 45 ° of phase shift lists
The output end of unit connects the first radio-frequency head of first RF switch (adopting 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).Second radio-frequency head and the 3rd 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 described 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 the first logic control end input high level, the first radio-frequency head and the second radio-frequency head connect
It is logical；When the second logic control end input high level, the first radio-frequency head and the 3rd radio-frequency head are connected.In circuit shown in Fig. 4
In, the first logic control end (A) input switch signal SW1 of chip U2, U4, the second logic control end (B) input switch
Signal SW2.The first logic control end (A) of chip U3, U5 input switch signal SW3, the second logic control end (B) is input into
Switching signal SW4.
When switching signal SW1 is high level, the phase shift passage that -45 ° of phase-shifting units are combined with 90 ° of phase-shifting units is beaten
Open, output signal ultimately generates the signal of 45 ° of phase shifts.When switching signal SW2 is high level, -45 ° of phase-shifting units are moved with -90 °
The phase shift passage of facies unit combination is opened, and output signal ultimately generates the signal of -135 ° of phase shifts.When switching signal SW3 is height
During level, the phase shift passage 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 passage 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, realizes that phase place is switched fast and accurate in interchannel
It is determined that position.Particularly, the phase converter is particularly well-suited to the phase place change of RFID full frequency band 840MHz-960MHz frequencies.
Specifically, as shown in Figure 5 a, -45 ° of phase-shifting units include the first electric capacity C1, the first inductance L1 and the second electric capacity
C2, the first electric capacity C1 one end ground connection, the other end are connected with one end of the first inductance L1, the other end of the first inductance L1
It is connected with one end of the second electric capacity C2, the other end ground connection of the second electric capacity C2；The first electric capacity C1 and the first inductance L1
Common port be -45 ° of phase-shifting units input, the second electric capacity C2 and the first inductance L1 common port be -45 ° of phase shift lists
The output end of unit；
As shown in Figure 5 b, 45 ° of phase-shifting units include the second inductance L2, the 3rd electric capacity C3 and the 3rd inductance L3, described
One end ground connection of the second inductance L2, the other end are connected with one end of the 3rd electric capacity C3, the other end of the 3rd electric capacity C3 and the
One end connection of three inductance L3, the other end ground connection of the 3rd inductance L3；The public affairs of the 3rd electric capacity C3 and the second inductance L2
Altogether end be the input of 45 ° of phase-shifting units, the common port of the 3rd electric capacity C3 and the 3rd inductance L3 be the defeated of 45 ° of phase-shifting units
Go out end；
As shown in Figure 5 c, -90 ° of phase-shifting units include the 4th electric capacity C4, the 4th inductance L4 and the 5th electric capacity C5, described
One end of 4th electric capacity C4 and one end of the 5th electric capacity C5 connect and are grounded, the other end and the 5th electric capacity of the 4th electric capacity C4
The other end of C5 connects respectively the two ends of the 4th inductance L4；The common port of the 4th electric capacity C4 and the 4th inductance L4 is -90 ° of shiftings
The input of facies unit, the common port of the 5th electric capacity C5 and the 4th inductance L4 is the output end of -90 ° of phase-shifting units；
As fig 5d, 90 ° of phase-shifting units include the 5th inductance L5, the 6th electric capacity C6 and the 6th inductance L6, described
One end of 5th inductance L5 and one end of the 6th inductance L6 connect and are grounded, the other end and the 6th inductance of the 5th inductance L5
The other end of L6 connects respectively the two ends of the 6th electric capacity C6；The common port of the 6th electric capacity C6 and the 5th inductance L5 is 90 ° of shiftings
The input of facies unit, the common port of the 6th electric capacity C6 and the 6th inductance L6 is 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 also includes combiner 400, and each second
First radio-frequency head RF1 of RF switch 220 is connected with an input of combiner 400.
Based on above-mentioned phase converter, a kind of carrier wave suppression circuit can be built.The carrier wave suppression circuit can be quickly
Position and be adjusted to desired phase.When the phase converter is used for carrier wave to be positioned and eliminate, to reach the mesh of quick positioning
, the quantity of the passage within 8, with reduce switching channel and scanning time.
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 connected with carrier wave suppression circuit.The radio-frequency identification reader/writer can be suppressed with velocity process carrier wave faster.
Each technical characteristic of embodiment described above can be combined arbitrarily, to make description succinct, not to above-mentioned reality
Apply 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, the scope of this specification record is all considered to be.
Embodiment described above only expresses the several embodiments of the present invention, and its description is more concrete and detailed, but and
Can not therefore be construed as limiting the scope of the patent.It should be pointed out that for one of ordinary skill in the art comes
Say, without departing from the inventive concept of the premise, some deformations and improvement can also be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be defined by claims.
Claims (10)
1. a kind of phase converter, it is characterised in that include：
Shunt, for by input signal be divided into it is more than two-way with input signal identical output signal；
Phase path unit, is connected with the output end of the shunt, many for the output signal more than two-way to be carried out
The phase shift of passage is processed；The wherein phase shift of each passage processes the signal for obtaining an out of phase；
Channel selection unit, for controlling the phase path unit in passage opening and closing, to obtain the signal of selected phase place.
2. phase converter according to claim 1, it is characterised in that the phase path unit includes and the output
First RF switch and the second RF switch of number of signals same number；First RF switch and the second RF switch are equal
Including the first radio-frequency head, the second radio-frequency head and the 3rd radio-frequency head；First RF switch and the second RF switch can be controlled
System makes the first radio-frequency head connect with the second radio-frequency head, or the first radio-frequency head is connected with the 3rd radio-frequency head；
First radio-frequency head of each first RF switch is input into radiofrequency signal and the second radio-frequency head and the 3rd radio-frequency head all the way
Connect the input of a phase-shifting unit respectively；
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 the 3rd radio-frequency head；
An output end of first radio-frequency head of each the second RF switch as phase path unit.
3. phase converter according to claim 2, it is characterised in that the first radio frequency of each first RF switch
End is connected with the output end of the shunt.
4. phase converter according to claim 2, it is characterised in that the first radio frequency of each first RF switch
Connect a phase-shifting unit between end and the output end of the shunt.
5. phase converter according to claim 4, it is characterised in that the output signal of the shunt is two-way, its
In all the way output signal be input to -45 ° of phase-shifting units, another road output signal and be input to 45 ° of phase-shifting units, each first radio frequency
Second radio-frequency head and the 3rd radio-frequency head of switch connects respectively -90 ° of phase-shifting units and 90 ° of phase-shifting units.
6. phase converter according to claim 5, it is characterised in that -45 ° of phase-shifting units include the first electric capacity,
First inductance and the second electric capacity, the first electric capacity one end ground connection, the other end are connected with one end of the first inductance, and described first is electric
The other end of sense is connected with one end of the second electric capacity, the other end ground connection of second electric capacity；First electric capacity and first electric
It is -45 ° of phase-shifting units that the common port of sense is the common port of the input, second electric capacity and the first inductance of -45 ° of phase-shifting units
Output end；
45 ° of phase-shifting units include the second inductance, the 3rd electric capacity and the 3rd inductance, one end ground connection of second inductance, another
One end is connected with one end of the 3rd electric capacity, and the other end of the 3rd electric capacity is connected with one end of the 3rd inductance, and the described 3rd is electric
The other end ground connection of sense；The common port of the 3rd electric capacity and the second inductance is the input of 45 ° of phase-shifting units, the described 3rd electric
Hold and the output end that the common port of the 3rd inductance is 45 ° of phase-shifting units；
- 90 ° of phase-shifting units include the 4th electric capacity, the 4th inductance and the 5th electric capacity, one end and the 5th of the 4th electric capacity
One end of electric capacity connects and is grounded, and the other end of the 4th electric capacity and the other end of the 5th electric capacity connect respectively the 4th inductance
Two ends；The common port of the 4th electric capacity and the 4th inductance is the input of -90 ° of phase-shifting units, the 5th electric capacity and the 4th
The common port of inductance is the output end of -90 ° of phase-shifting units；
90 ° of phase-shifting units include the 5th inductance, the 6th electric capacity and the 6th inductance, one end of the 5th inductance and the 6th electric
One end of sense connects and is grounded, and the other end of the 5th inductance and the other end of the 6th inductance connect respectively the two of the 6th electric capacity
End；The common port of the 6th electric capacity and the 5th inductance is the input of 90 ° of phase-shifting units, the 6th electric capacity and the 6th inductance
Common port be 90 ° of phase-shifting units output end.
7. phase converter according to claim 2, it is characterised in that each described first RF switch and the second radio frequency
Switch is equipped with the first logic control end and the second logic control end, and when the first logic control end input high level,
First radio-frequency head and the second radio-frequency head are connected；When the second logic control end input high level, the first radio-frequency head and the 3rd
Radio-frequency head is connected.
8. phase converter according to claim 2, it is characterised in that also including combiner, each second RF switch
The first radio-frequency head be connected with an input of the combiner.
9. a kind of carrier wave suppression circuit, including the phase converter described in any one of claim 1～8.
10. the carrier wave suppression circuit described in a kind of radio-frequency identification reader/writer, including signal receiving circuit and claim 9, it is described
Signal receiving circuit is connected with carrier wave suppression circuit.
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| 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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| 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 |
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| CN106650526B (en) | 2019-05-31 |
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