CN110233327A - A kind of UHF RFID reader antenna and switching method - Google Patents
A kind of UHF RFID reader antenna and switching method Download PDFInfo
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- CN110233327A CN110233327A CN201910449792.3A CN201910449792A CN110233327A CN 110233327 A CN110233327 A CN 110233327A CN 201910449792 A CN201910449792 A CN 201910449792A CN 110233327 A CN110233327 A CN 110233327A
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- feeding network
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- arm feeding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/20—Arrays of individually energised antenna units similarly polarised and spaced apart the units being spaced along or adjacent to a curvilinear path
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Abstract
The embodiment of the present invention provides a kind of UHF RFID reader antenna and switching method.The antenna includes: to be uniformly distributed 2N identical antenna element in the front of printed circuit board, divide power splitter and phase extended line in obverse and reverse setting N of printed circuit board etc. respectively, RF switch is set, amplitude is identical and first group of N arm feeding network of 360 °/N of phase phase difference with dividing power splitter and phase extended line to constitute positioned at positive N etc. for positive N number of antenna oscillator, in addition N number of antenna oscillator and the N etc. positioned at reverse side divide power splitter and phase extended line to constitute amplitude is identical and second group of N arm feeding network of composition of 360 °/N of phase phase difference, RF switch control switching antenna enters first group of N arm feeding network mode or second group of N arm feeding network mode.The embodiment of the present invention, in the case where not increasing cost and system complexity, increases the recognition area coverage of near-field region while keeping UHF RFID recognition apart from remote feature.
Description
Technical field
The present embodiments relate to antenna technical fields, and in particular to a kind of UHF RFID (super high frequency radio frequency identification) reading
Device antenna and switching method.
Background technique
Radio frequency identification (Radio Frequency Identification, RFID) is that one kind is known automatically by radiofrequency signal
Other target object, and rapidly carry out the automatic identification technology of item tracing and data exchange.RFID technique without manual intervention,
Various adverse circumstances are operable with, can identify multiple labels simultaneously, it is swift and convenient to operate, it is widely used in warehouse logistics, figure
The fields such as book management, industrial production, traffic, clothes.
Fig. 1 is RFID system structural schematic diagram in the prior art, as shown in Figure 1, RFID system mainly consists of three parts:
Reader (Reader), label (Tag) and data processing system (Processor), reader include control module, radio-frequency module
With reader antenna (Reader Antenna)；Label includes label antenna and label chip.
Currently, RFID there are four working frequency range, is respectively: low frequency (LF:135KHz~134KHz), high frequency (HF:
13.56MHz), hyperfrequency (UHF:860~960MHz) and microwave band (2.4GHz and 5.8GHz).UHF RFID technique has
Read simultaneously multiple labels, can repeatedly read and write, data capacity is big, label is at low cost, small in size, easy to use, reliability and longevity
The features such as high is ordered, is had been widely used.
The label antenna of uhf band mostly uses greatly dipole antenna form, and polarization direction is linear polarization, each in order to distinguish
The label of polarization direction, traditional UHF reader antenna generally use circular polarized antenna, such as four arm spiral circular polarized antennas and micro-
Band circular polarized antenna etc., with high gain, recognition apart from it is remote the features such as, usually up to 10 meters.But it is in near-field region (30cm
Within) Energy distribution concentrates or uneven, it is small or there is recognition blind area to lead to distinguish overlay area, make uhf band near field or
It is restricted in the RFID application of the existing scene near field, far field.
Summary of the invention
For the defects in the prior art, the embodiment of the invention provides a kind of UHF RFID (super high frequency radio frequency identification) to read
Read device antenna and switching method.
In a first aspect, the embodiment of the present invention provides a kind of UHF RFID reader antenna, comprising: first group of N arm transmission network
Network, second group of N arm feeding network and RF switch；
First group of N arm feeding network includes identical and is evenly distributed on the positive 2N antenna oscillator of printed circuit board
In N number of antenna oscillator and divide phase-shift network positioned at the positive function of the printed circuit board, wherein N is integer greater than 1；
Second group of N arm feeding network includes remaining N number of antenna oscillator in the 2N antenna oscillator and is located at print
The function of circuit board reverse side processed divides phase-shift network, wherein the antenna oscillator cross arrangement in two groups of N arm feeding networks；
The function divides phase-shift network to include that N etc. divides power splitter and N number of phase extended line, and described N etc. divides power splitter to include 1
Input port and N number of output port, described N etc. divide N number of output port of power splitter respectively with N number of phase extended line one
End is connected, and N number of amplitude is identical and the feed of 360 °/N of phase phase difference for providing, the other end of N number of phase extended line
The feed end of N number of antenna oscillator in corresponding N arm feeding network is connected respectively, the ground connection of N number of antenna oscillator
End is connected with the positive ground terminal that refers to of the printed circuit board；
The RF switch divides the input port, described of power splitter with the N etc. in first group of N arm feeding network respectively
N etc. in second group of N arm feeding network divides the input port of power splitter and the control module of UHF RFID reader to be connected, institute
RF switch is stated under the control of the control module, the UHF RFID reader antenna is switched into first group of N arm
Feeding network or second group of N arm feeding network.
Such as above-mentioned antenna, optionally, the RF switch includes: rf inputs mouth, two radio frequency output ports and two
A direct-flow input end mouth；
The rf inputs mouth is connected with the radio-frequency module of UHF RFID reader；
Described two radio frequency output ports divide the input of power splitter with the N etc. in first group of N arm feeding network respectively
Port divides the input port of power splitter to be connected with the N etc. in second group of N arm feeding network；
Described two direct-flow input end mouths respectively with the DC power supply of the reader and the UHF RFID reader
Control module is connected, and described two direct-flow input end mouths, will be described by direct current signal under the control of the control module
UHF RFID reader antenna switches to first group of N arm feeding network or second group of N arm feeding network.
Such as above-mentioned antenna, optionally, the first direct-flow input end mouth in two direct-flow input end mouths of the RF switch
When the second direct-flow input end mouth in power supply and described two direct-flow input end mouths powers off, first group of N arm feeding network connects
It is logical；
When the second direct-flow input end confession electricity and the first direct-flow input end mouth power-off, second group of N arm feedback
Electric network connection.
As above-mentioned antenna optionally forms described N etc. by microstrip transmission line and divides power splitter and the phase extended line.
It is optionally, described described N etc. is formed by microstrip transmission line to divide power splitter such as above-mentioned antenna, comprising:
N-1 bisection Wilkinson power divider, each bisection Wilkinson function are formed by microstrip transmission line
Being divided to device includes two output ports and an input port, connects the N-1 bisection Wilkinson power divider and forms the N
Equal part power splitter.
It is optionally, described that the phase extended line is formed by microstrip transmission line such as above-mentioned antenna, comprising:
According to the operation wavelength λ of the microstrip transmission line0, dielectric constant ∈rThe micro-strip transmission is calculated with depth-width ratio h/W
The waveguide wavelength λ of lineg；
Calculate λg/ N determines the length of the phase extended line.
Such as above-mentioned antenna, optionally, N=2M, M are the integer greater than 1, and the 2N antenna oscillator is in the printing electricity
The road rounded arrangement in plate front.
Such as above-mentioned antenna, optionally, N=4.
Second aspect, the embodiment of the present invention provide a kind of UHF RFID reader antenna switching method, are applied to institute as above
In the UHF RFID reader antenna stated, comprising:
When needing to read the data of label antenna, switches the RF switch by predeterminated frequency and be connected to described first group
N arm feeding network or second group of N arm feeding network are to read the data of the label antenna.
Such as the above method, optionally, further includes:
If having read all data of the label antenna, stop switching.
UHF RFID reader antenna provided in an embodiment of the present invention is uniformly distributed 2N phase in the front of printed circuit board
Same antenna element divides power splitter and phase extended line in obverse and reverse setting N etc. respectively, radio frequency is arranged in front or back
Switch, amplitude is identical and phase phase difference with dividing power splitter and phase extended line to constitute positioned at positive N etc. for positive N number of antenna oscillator
First group of N arm feeding network of 360 °/N, other N number of antenna with the antenna oscillator cross arrangement of first group of N arm feeding network
Oscillator and the N etc. positioned at reverse side divide power splitter and phase extended line to constitute, and amplitude is identical and the composition second of 360 °/N of phase phase difference
Group N arm feeding network, RF switch control switching antenna enter first group of N arm feeding network mode or second group of N arm transmission network
Network mode.The embodiment of the present invention is multiple not increasing cost and system while keeping UHF RFID recognition apart from remote feature
In the case where miscellaneous degree, the recognition area coverage of near-field region is increased.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is RFID system structural schematic diagram in the prior art；
Fig. 2 is the pcb board positive structure schematic of UHF RFID reader antenna provided in an embodiment of the present invention；
Fig. 3 is the pcb board reverse structure schematic of UHF RFID reader antenna provided in an embodiment of the present invention；
Fig. 4 is the quartering structure schematic diagram of UHF RFID reader antenna provided in an embodiment of the present invention；
Fig. 5 is the near field field distribution schematic diagram of first group of four arm feeding network provided in an embodiment of the present invention；
Fig. 6 is the near field field distribution schematic diagram of second group of four arm feeding network provided in an embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In order to improve the near field area coverage of UHF RFID reader antenna, the embodiment of the present invention is taken in printed circuit board
The front (Top) of (Printed Circuit Board, PCB) is uniformly distributed 2N identical antenna element, respectively PCB's
Obverse and reverse (Bot) setting N etc. divides power splitter and phase extended line, and RF switch, front is arranged in the front or back of PCB
N number of antenna oscillator divide power splitter and phase extended line to constitute that amplitude is identical and 360 °/N of phase phase difference with positioned at positive N etc.
First group of N arm feeding network, with other N number of antenna oscillator of the antenna oscillator cross arrangement of first group of N arm feeding network and position
Dividing power splitter and phase extended line to constitute in the N etc. of reverse side, amplitude is identical and second group of N arm transmission network of 360 °/N of phase phase difference
Network, RF switch control switching antenna enter first group of N arm feeding network mode or second group of N arm feeding network mode.Due to
The near field intensity of two groups of feeding networks is complementary, therefore by switched feed network mode, improves the near field of UHF RFID antenna
Overlay area.
Below in conjunction with attached drawing, the technical scheme provided by various embodiments of the present application will be described in detail.
Fig. 2 is the pcb board positive structure schematic of UHF RFID reader antenna provided in an embodiment of the present invention, and Fig. 3 is
The pcb board reverse structure schematic of UHF RFID reader antenna provided in an embodiment of the present invention, as shown in Fig. 2 Fig. 3, UHF
RFID reader antenna includes:
First group of N arm feeding network, second group of N arm feeding network and RF switch；
First group of N arm feeding network includes identical and is evenly distributed on the positive 2N antenna oscillator of printed circuit board
In N number of antenna oscillator and divide phase-shift network positioned at the positive function of the printed circuit board, wherein N is integer greater than 1；
Second group of N arm feeding network includes remaining N number of antenna oscillator in the 2N antenna oscillator and is located at print
The function of circuit board reverse side processed divides phase-shift network, wherein the antenna oscillator cross arrangement in two groups of N arm feeding networks；
The function divides phase-shift network to include that N etc. divides power splitter and N number of phase extended line, and described N etc. divides power splitter to include 1
Input port and N number of output port, described N etc. divide N number of output port of power splitter respectively with N number of phase extended line one
End is connected, and N number of amplitude is identical and the feed of 360 °/N of phase phase difference for providing, the other end of N number of phase extended line
The feed end of N number of antenna oscillator in corresponding N arm feeding network is connected respectively, the ground connection of N number of antenna oscillator
End is connected with the positive ground terminal that refers to of the printed circuit board；
The RF switch divides the input port, described of power splitter with the N etc. in first group of N arm feeding network respectively
N etc. in second group of N arm feeding network divides the input port of power splitter and the control module of UHF RFID reader to be connected, institute
RF switch is stated under the control of the control module, the UHF RFID reader antenna is switched into first group of N arm
Feeding network or second group of N arm feeding network.
Specifically, as shown in Fig. 2, being uniformly distributed 2N identical antenna oscillators, these antenna vibration in the face Top of PCB
Son includes feed end and ground terminal, and the ground terminal of antenna oscillator is connected with the reference ground terminal in the face Top, can with reference to ground terminal
It is realized with taking the face Top in PCB to cover copper.N etc. is additionally provided in the face Top of PCB and divides power splitter, and N etc. divides the purpose of power splitter
It is the feed in order to realize N number of same-amplitude, N etc. divides power splitter to include 1 input port and N number of output port, N number of output end
Mouth is separately connected N phase extended line, and the purpose of phase extended line is to realize that N number of phase difference is the feed of 360 °/N, example
Such as, N=8, then phase extended line needs to realize the feed of 45 ° of 8 phase phase differences, the other end of N phase extended line and the face Top
The feed end of mutual non-conterminous N number of antenna element be connected, such as N phase extended line the other end in sequence successively
Connect the feed end of antenna element 1, the feed end of antenna element 3, feed end of antenna oscillator 5 etc..N etc. divides power splitter and phase
Extended line constitutes function and divides phase-shift network.Positive N of PCB etc. divides power splitter, phase extended line and antenna oscillator to form amplitude
Identical and 360 °/N of phase phase difference feeding network, is denoted as first group of N arm feeding network.The input of first group of N arm feeding network
End is the input terminal that N etc. divides power splitter, connects the input terminal of first group of N arm feeding network, then UHF RFID reader antenna
It is switched to first group of N arm feeding network mode.
It is similar, as shown in figure 3, being uniformly distributed 2N identical antenna oscillators (in the face Bot with void in the face Top of PCB
Line indicates), these antenna oscillator includes feed end and ground terminal, the ground terminal and the reference ground terminal in the face Top of antenna oscillator
It is connected, can be taken with reference to ground terminal and cover copper realization in the face Top of PCB.N etc., which is also equipped with, in the face Bot of PCB divides function point
Device, the purpose that N etc. divides power splitter is feed in order to realize N number of same-amplitude, and N etc. divides power splitter to include 1 input port and N
A output port, N number of output port are separately connected N phase extended line, and the purpose of phase extended line is to realize N number of phase
Difference is the feed of 360 °/N, for example, N=8, then phase extended line needs to realize the feed of 45 ° of 8 phase phase differences, and N phase is prolonged
The other end of long line is connected with the feed end of mutual non-conterminous N number of antenna element in the face Top, the feedback of this N number of antenna oscillator
Electric end passes through PCB and is connected in the face Bot with phase extended line, such as the other end of N phase extended line is sequentially connected in sequence
The feed end of antenna element 2, the feed end of antenna element 4, feed end of antenna oscillator 6 etc..The N etc. of PCB reverse side divide power splitter,
Phase extended line and the antenna oscillator positioned at the face Top form that amplitude is identical and the feeding network of 360 °/N of phase phase difference, are denoted as
Second group of N arm feeding network.The input terminal of second group of N arm feeding network is the input terminal that N etc. divides power splitter, connects second group
The input terminal of N arm feeding network, then UHF RFID reader antenna is switched to second group of N arm feeding network mode.It is worth noting
, antenna oscillator cross arrangement in two groups of N arm feeding networks.
First group of N arm feeding network and second group of N arm transmission network are realized by control RF switch in the embodiment of the present invention
The switching of network, RF switch can both be arranged in the front PCB or be arranged in the back side PCB, and the embodiment of the present invention does not do this
It limits, one end of RF switch is connected with the control module (having shown that in Fig. 1) of UHF RFID reader, and RF switch also divides
The N in the input port and second group of N arm feeding network of power splitter etc. is not divided to divide function with the N etc. in first group of N arm feeding network
The input port of device is divided to be connected, when control module control RF switch is connected to first group of N arm feeding network, reader antenna
It is read in first group of N arm feeding network mode when control module control RF switch is connected to second group of N arm feeding network
Device antenna is in second group of N arm feeding network mode, since two groups of N arm feeding networks include that N number of amplitude is identical and phase phase
The feed of poor 360 °/N and two groups of oscillator cross arrangements, therefore pass through the switching of two groups of feeding modes, it can be improved reader day
The near-field region of line distinguishes area coverage.
On the basis of the above embodiments, further, RF switch may include: 1 rf inputs mouth, two penetrate
Frequency output port and two direct-flow input end mouths；
The rf inputs mouth is connected with the radio-frequency module (shown in Fig. 1) of UHF RFID reader；
Described two radio frequency output ports divide the input of power splitter with the N etc. in first group of N arm feeding network respectively
Port divides the input port of power splitter to be connected with the N etc. in second group of N arm feeding network；
Described two direct-flow input end mouths respectively with the DC power supply of the reader and the UHF RFID reader
Control module is connected, and described two direct-flow input end mouths, will be described by direct current signal under the control of the control module
UHF RFID reader antenna switches to first group of N arm feeding network or second group of N arm feeding network.
Further, the first direct-flow input end confession in two direct-flow input end mouths of RF switch is electric and described two
When the second direct-flow input end mouth in direct-flow input end mouth powers off, first group of N arm feeding network connection；
When the second direct-flow input end confession electricity and the first direct-flow input end mouth power-off, second group of N arm feedback
Electric network connection.
Specifically, by the radio-frequency module of coaxial feeder and reader, (Fig. 1 has shown the rf inputs mouth of RF switch
It is connected out), the N etc. in the first output port and first group of N arm feeding network in two radio frequency output ports divides power splitter
Input port be connected, the N equal part in second output terminal mouth and second group of N arm feeding network in two radio frequency output ports
The input port of power splitter is connected, and two direct-flow input end mouths are connected with the DC power supply of reader, and two direct currents
Input port is also connected with the control module of UHF RFID reader, and control module can control direct-flow input end mouth, and whether there is or not direct currents
Signal, wherein the first direct-flow input end mouth is connected to first group of N arm feeding network, the second direct-flow input end mouth is connected to second group of N arm
Feeding network.Two direct-flow input end mouths form two groups of switching modes, respectively mode 1 (1,0) and mode 2 (0,1).When first
When direct-flow input end confession electricity and the power-off of the second direct-flow input end mouth, only there is direct current signal in the first direct-flow input end mouth, formed
Mode 1, first group of N arm feeding network connection, first group of N arm feeding network is in running order, when the second direct-flow input end mouth
When power supply and the power-off of the first direct-flow input end mouth, only there are direct current signal, formation mode 2, second group of N in the second direct-flow input end mouth
The connection of arm feeding network, second group of N arm feeding network are in running order.
On the basis of the various embodiments described above, further, described N etc. is formed by microstrip transmission line and divides power splitter and institute
State phase extended line.
It is described described N etc. is formed by microstrip transmission line to divide power splitter, comprising:
N-1 bisection Wilkinson power divider, each bisection Wilkinson function are formed by microstrip transmission line
Being divided to device includes two output ports and an input port, connects the N-1 bisection Wilkinson power divider and forms the N
Equal part power splitter.
It is described that the phase extended line is formed by microstrip transmission line, comprising:
According to the operation wavelength λ of the microstrip transmission line0, dielectric constant ∈rThe micro-strip transmission is calculated with depth-width ratio h/W
The waveguide wavelength λ of lineg；
Calculate λg/ N determines the length of the phase extended line.
Specifically, N etc. can be formed by microstrip transmission line and divides power splitter and phase extended line, microstrip transmission line is by propping up
The microwave transmission line that plain conductor band on dielectric substrate is constituted.N-1 bisection Weir is made with microstrip transmission line first
The gloomy power splitter of gold, the method for making Wilkinson power divider is the prior art, and the embodiment of the present invention repeats no more, each bisection
Wilkinson power divider includes 1 input port and two output ports, and N-1 bisection Wilkinson power divider of connection is formed
N etc. divides power splitter.For example, Fig. 4 is the quartering power divider structure of UHF RFID reader antenna provided in an embodiment of the present invention
Schematic diagram, as shown in figure 4, input port of the input port of first bisection power splitter as entire quartering power splitter,
Two output ports respectively connect the input port of second bisection power splitter and the input port of third bisection power splitter,
Two output ports that second two output port for halving power splitter and third halve power splitter form the quartering
4 output ports of power splitter.
It can also realize that phase extends using the length of microstrip transmission line, it is first determined used microstrip transmission line
Operation wavelength λ0, dielectric constant ∈rWith depth-width ratio h/W, (h is height, and W is width) then calculates microstrip transmission line according to following formula
Waveguide wavelength λg:
Then the length L of phase extended line is calculated according to following formula:
For example, if N=4, extension line length that calculated L is 90 ° of phase phase difference.For example, calculating phase phase difference
90 ° of extension line length is 12.96mm, then can fix the length of a wherein phase extended line, successively be added in order
12.96mm forms Article 2 phase extended line, is added 2*12.96mm and forms Article 3 phase extended line, is added 3*12.96mm shape
At Article 3 phase extended line, achieve that phase differs 90 ° in this way.
On the basis of the various embodiments described above, further, N=2M, M are the integer greater than 1, and the 2N antenna shakes
Son is in the rounded arrangement in the printed circuit board front, it is preferable that N=4.
Specifically, in order to improve the near field overlay area of UHF RFID reader antenna, 4M antenna oscillator can be set,
In the rounded arrangement in the front PCB, to form two groups of circular polarized antennas, for example, setting N=4, then shaken using 8 identical antennas
Son forms two group of four arm spiral circular polarized antenna in the obverse and reverse of PCB respectively, can significantly increase UHF RFID reader
The near field overlay area of antenna.Fig. 5 is that the near field field distribution of first group of four arm feeding network provided in an embodiment of the present invention is shown
It is intended to；Fig. 6 is the near field field distribution schematic diagram of second group of four arm feeding network provided in an embodiment of the present invention, such as Fig. 5 and Fig. 6
Shown, gray scale is deeper, indicates that electric field is stronger, can visually see, first group of four arm feeding network and second group of four arm feed
The near field intensity of network is complementary, to increase the near field overlay area of UHF RFID reader antenna.
UHF RFID reader antenna provided in an embodiment of the present invention is keeping UHF RFID to distinguish apart from remote feature
Meanwhile in the case where not increasing cost and system complexity, the recognition area coverage of near-field region is increased.
Based on above-mentioned UHF RFID reader antenna, the embodiment of the present invention also provides a kind of UHF RFID reader antenna and cuts
Change method, comprising:
When needing to read the data of label antenna, switches the RF switch by predeterminated frequency and be connected to described first group
N arm feeding network or second group of N arm feeding network are to read the data of the label antenna.
If having read all data of the label antenna, stop switching.
Specifically, since UHF RFID reader antenna has two groups of N arm feeding networks, when needing to read label
When the data of antenna, different N arm feeding networks can be switched by control module control RF switch and enter working condition, example
Such as, RF switch can be controlled by predeterminated frequency so that first group of N arm feeding network and second group of N arm feeding network are by default
Frequency error factor then stops switching when having read all data of label antenna.Wherein, switch first group of N arm transmission network
The method of network and second group of N arm feeding network has illustrated that details are not described herein again in above-mentioned apparatus embodiment.The present invention is implemented
The UHF RFID reader antenna switching method that example provides is keeping UHF RFID to distinguish distance by switching N arm feeding network
While remote feature, in the case where not increasing cost and system complexity, the recognition area coverage of near-field region is increased.
Those of ordinary skill in the art will appreciate that: realize that all or part of the steps of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can store in computer-readable storage medium, which exists
When execution, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes: ROM, RAM, magnetic or disk
Etc. the various media that can store program code.
The embodiments such as device described above are only schematical, wherein the unit as illustrated by the separation member
It may or may not be physically separated, component shown as a unit may or may not be physics list
Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
Labour in the case where, it can understand and implement.
Finally, it should be noted that the above various embodiments is only to illustrate the technical solution of the embodiment of the present invention, rather than it is right
It is limited；Although the embodiment of the present invention is described in detail referring to foregoing embodiments, the ordinary skill of this field
Personnel are it is understood that it is still possible to modify the technical solutions described in the foregoing embodiments, or to part
Or all technical features are equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution
The range of various embodiments of the present invention technical solution.
Claims (10)
1. a kind of UHF RFID reader antenna characterized by comprising first group of N arm feeding network, second group of N arm feed
Network and RF switch；
First group of N arm feeding network includes identical and is evenly distributed in the positive 2N antenna oscillator of printed circuit board
N number of antenna oscillator and divide phase-shift network positioned at the positive function of the printed circuit board, wherein N is the integer greater than 1；
Second group of N arm feeding network includes remaining N number of antenna oscillator in the 2N antenna oscillator and is located at printing electricity
The function of road plate reverse side divides phase-shift network, wherein the antenna oscillator cross arrangement in two groups of N arm feeding networks；
The function divides phase-shift network to include that N etc. divides power splitter and N number of phase extended line, and described N etc. divides power splitter to include 1 input
Port and N number of output port, described N etc. divide N number of output port of power splitter one end phase with N number of phase extended line respectively
Connection, N number of amplitude is identical and the feed of 360 °/N of phase phase difference for providing, the other end difference of N number of phase extended line
The feed end of N number of antenna oscillator in corresponding N arm feeding network is connected, the ground terminal of N number of antenna oscillator with
The printed circuit board is positive to be connected with reference to ground terminal；
The RF switch divides the input port of power splitter, described second with the N etc. in first group of N arm feeding network respectively
N etc. in group N arm feeding network divides the input port of power splitter and the control module of UHF RFID reader to be connected, described to penetrate
The UHF RFID reader antenna is switched to first group of N arm and fed by frequency switch under the control of the control module
Network or second group of N arm feeding network.
2. antenna according to claim 1, which is characterized in that the RF switch include: rf inputs mouth, two penetrate
Frequency output port and two direct-flow input end mouths；
The rf inputs mouth is connected with the radio-frequency module of UHF RFID reader；
Described two radio frequency output ports divide the input port of power splitter with the N etc. in first group of N arm feeding network respectively
The input port of power splitter is divided to be connected with the N etc. in second group of N arm feeding network；
The control with the DC power supply of the reader and the UHF RFID reader respectively of described two direct-flow input end mouths
Module is connected, and described two direct-flow input end mouths are under the control of the control module, by direct current signal by the UHF
RFID reader antenna switches to first group of N arm feeding network or second group of N arm feeding network.
3. antenna according to claim 2, which is characterized in that in two direct-flow input end mouths of the RF switch
When the second direct-flow input end mouth in the power supply of one direct current input port and described two direct-flow input end mouths powers off, described first group
The connection of N arm feeding network；
When the second direct-flow input end confession electricity and the first direct-flow input end mouth power-off, second group of N arm transmission network
Network connection.
4. antenna according to claim 1 to 3, which is characterized in that form described N etc. by microstrip transmission line and divide function
Divide device and the phase extended line.
5. antenna according to claim 4, which is characterized in that described to form described N etc. by microstrip transmission line and divide function point
Device, comprising:
N-1 bisection Wilkinson power divider, each bisection Wilkinson power divider are formed by microstrip transmission line
Including two output ports and an input port, connects the N-1 bisection Wilkinson power divider and form the N equal part
Power splitter.
6. antenna according to claim 4, which is characterized in that described to form the phase extension by microstrip transmission line
Line, comprising:
According to the operation wavelength λ of the microstrip transmission line0, dielectric constant ∈rThe microstrip transmission line is calculated with depth-width ratio h/W
Waveguide wavelength λg；
Calculate λg/ N determines the length of the phase extended line.
7. antenna according to claim 4, which is characterized in that N=2M, M are integer greater than 1, and the 2N antenna
Oscillator is in the rounded arrangement in the printed circuit board front.
8. antenna according to claim 7, which is characterized in that N=4.
9. a kind of UHF RFID reader antenna switching method, which is characterized in that any described applied to claim 1-8
In UHF RFID reader antenna, comprising:
When needing to read the data of label antenna, switches the RF switch by predeterminated frequency and be connected to first group of N arm
Feeding network or second group of N arm feeding network are to read the data of the label antenna.
10. according to the method described in claim 9, it is characterized by further comprising:
If having read all data of the label antenna, stop switching.
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