CN208477534U - A kind of RFID antenna and RFID reader - Google Patents
A kind of RFID antenna and RFID reader Download PDFInfo
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- CN208477534U CN208477534U CN201821027836.0U CN201821027836U CN208477534U CN 208477534 U CN208477534 U CN 208477534U CN 201821027836 U CN201821027836 U CN 201821027836U CN 208477534 U CN208477534 U CN 208477534U
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Abstract
The utility model discloses a kind of RFID antennas, comprising: antenna body, the first polarized signal port, the second polarized signal port, third polarized signal port, first switch, second switch and third switch；First polarized signal port, the second polarized signal port, third polarized signal port are set to the transmitting-receiving that not co polar signal is realized at the different location of the antenna body；The first switch is connect with the first polarized signal port electrical；The second switch is connect with the second polarized signal port electrical；Third polarized signal port and third switch are electrically connected.The invention also discloses a kind of RFID readers, are based on the utility model, it may be determined that a more well-regulated antenna read range, to reduce the probability for misreading skip.
Description
Technical field
The utility model relates to less radio-frequency fields, more particularly to a kind of RFID antenna and RFID reader.
Background technique
Conventional RFID tag, all directions gain have a long way to go, it means that apart from RFID antenna it is identical away from
From RFID tag is put in different directions in space, and reception has very big difference, causes to occur more from RFID antenna
The RFID tag of remote distance is misread since direction can be generated well with normal communication, and the label close apart from RFID antenna due to
Direction receive signal capabilities difference cannot be read by RFID antenna and generate skip, in this way, can not determine one it is more regular
RFID antenna read range.
Utility model content
The purpose of this utility model is that proposing a kind of RFID antenna and RFID reader, it may be determined that a comparison has rule
RFID antenna read range then reduces the probability for misreading skip.
The utility model provides a kind of RFID antenna, comprising:
Antenna body, the first polarized signal port, the second polarized signal port, third polarized signal port, first switch,
Second switch and third switch；
First polarized signal port, the second polarized signal port, third polarized signal port are set to the antenna
The transmitting-receiving of not co polar signal is realized at the different location of main body；
The first switch is connect with the first polarized signal port electrical；The second switch and second polarization
Signal port electrical connection；Third polarized signal port and third switch are electrically connected.
Preferably, the first switch, second switch and third switch are diode switch control circuit.
Preferably, the antenna body includes guiding piece, radiation fin, metal floor and metal cylinder into；
Wherein, piece, radiation fin, the metal floor of guiding into is connected to the metal cylinder, and the radiation fin is arranged
It is guided between piece and the metal floor in described；The radiation fin includes main part and the different location from the main part
The first arm and the second arm to extend out, and first arm is connect with second arm；
First polarized signal port is set on the first arm, and is connect with the metal floor；Second polarization
Signal port is set on the second arm, and is connect with the metal floor；Third polarized signal port is set to described
The junction of one arm and second arm, and connect with the metal floor.
Preferably, the length of first arm is identical as the length of second arm；One end of first arm and described
One end of second arm is connected to the main part；The other end of the other end of first arm and second arm vertically connects.
Preferably, first polarized signal port reaches the distance of the main part by first arm and passes through institute
The corresponding phase difference of path length difference for stating the distance that the second arm reaches the main part is (2m ± 1/2) π, wherein m is integer；
Second polarized signal port by second arm reach the distance of the main part with by described first
The corresponding phase difference of path length difference that arm reaches the distance of the main part is (2n ± 1/2) π, wherein n is integer；
Third polarized signal port by first arm reach the distance of the main part with by described second
The distance that arm reaches the main part is equal.
Preferably, first polarized signal port, the second polarized signal port, third polarized signal port are coaxial
The port of structure.
Preferably, first polarized signal port, the second polarized signal port, third polarized signal port include interior
Core and shell, the inner core are set in the shell；Wherein, the shell is connect with the metal floor；The inner core
It is connect with the radiation fin, to realize signal transmitting and receiving.
The utility model additionally provides a kind of RFID reader, including read-write chip, controller and such as above-mentioned RFID
Antenna；The controller is connect respectively with the first switch, second switch, third switch and read-write chip connection.
In the present embodiment, the first polarized signal port, the second polarized signal are arranged by the different location in antenna body
Port, third polarized signal port, realize the transmitting-receiving of not co polar signal, so that RFID antenna can obtain one
The reliable communication range of rule, reduces the probability for misreading skip appearance.
Detailed description of the invention
It, below will be to attached needed in embodiment in order to illustrate more clearly of the technical solution of the utility model
Figure is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the utility model, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of structural schematic diagram for the RFID antenna that the utility model first embodiment provides.
Fig. 2 is another structural schematic diagram for the RFID antenna that the utility model first embodiment provides.
Fig. 3 is another structural schematic diagram for the RFID antenna that the utility model first embodiment provides.
Fig. 4 is the structural schematic diagram for the RFID reader that the utility model second embodiment provides.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without creative efforts
Every other embodiment obtained, fall within the protection scope of the utility model.
Referring to Fig. 1, first embodiment of the invention provides a kind of RFID antenna, comprising:
Antenna body 10, the first polarized signal port 20, the second polarized signal port 30, third polarized signal port 40,
First switch 50, second switch 60 and third switch 70；Wherein, first polarized signal port 20, the second polarized signal end
Mouth 30, third polarized signal port 40 are set at the different location of the antenna body 10；The first switch 50 with it is described
The electrical connection of first polarized signal port 20；The second switch 60 is electrically connected with second polarized signal port 30；Institute
It states third polarized signal port 40 and the third switch 70 is electrically connected.
Please refer to figs. 2 and 3, and in the present embodiment, the antenna body 10 includes guiding piece 11, radiation fin 12, metal into
Floor 13 and metal cylinder 14.
Wherein, piece 11, radiation fin 12, the metal floor 13 of guiding into is connected to the metal cylinder 14, and the spoke
It penetrates piece 12 and is set to described guide between piece 11 and the metal floor 13；The radiation fin 12 include main part 121 and from
The first arm 122 and the second arm 123 that the different location of the main part 121 extends out, and first arm 122 with it is described
The connection of second arm 123.
In the present embodiment, first polarized signal port 20 is set on the first arm 122, and with the metal floor
13 connections；Second polarized signal port 30 is set on the second arm 123, and is connect with the metal floor 13；Described
Three polarized signal ports 40 are set to the junction of first arm 122 with second arm 123, and with the metal floor 13
Connection.
Preferably, first arm 122 may include the first linking arm and the second linking arm, wherein first linking arm
One end connect the radiation fin 12, the other end connects one end of second linking arm.Second arm 123 may include third
Linking arm and the 4th linking arm, wherein one end of the third linking arm connects the radiation fin 12, other end connection described the
One end of four linking arms.The other end of second linking arm connects the other end of the 4th linking arm.
Preferably, first linking arm is vertical with the second linking arm connect, and is parallel to third linking arm；The third
Linking arm is vertical with the 4th linking arm to be connect.Second linking arm is vertical with the 4th linking arm to be connect.Certainly, also
There can be other connection types, the utility model is not specifically limited.Moreover it is preferred that length and the institute of first arm 122
The length for stating the second arm 123 is identical.
Preferably, first polarized signal port 20, the second polarized signal port 30, third polarized signal port 40 are equal
For the port of coaxial configuration.Wherein, first polarized signal port 20, the second polarized signal port 30, third polarized signal
Port 40 includes inner core and shell, and the inner core is set in the shell；Wherein, the shell and the metal floor
13 connections；The inner core is connect with the radiation fin 12, and can realize the transmission of signal.
Preferably, first polarized signal port 20 reaches the road of the main part 121 by first arm 122
Journey phase difference corresponding with the path length difference of distance for reaching the main part 121 by second arm 123 is (2m ± 1/2) π,
Wherein, m is integer.In this way, first polarized signal port 20 can realize the receipts of the polarized electromagnetic wave signal of right-hand circular polarization
Hair.
Second polarized signal port 30 is reached the distance of the main part 121 and is passed through by second arm 123
The corresponding phase difference of path length difference that first arm 122 reaches the distance of the main part 121 is (2n ± 1/2) π, wherein n
For integer.In this way, second polarized signal port 30 can realize the transmitting-receiving of the polarized electromagnetic wave signal of Left-hand circular polarization.
Third polarized signal port 40 is reached the distance of the main part 121 and is passed through by first arm 122
The distance that second arm 123 reaches the main part 121 is equal.In this way, third polarized signal port 40 can realize line
Polarize the transmitting-receiving of polarized electromagnetic wave signal.
It is introduced below working principle of the utility model is:
Signal higher for frequency, one is being propagated in a manner of electromagnetic wave, one kind is in a manner of electric signal in conductor
It propagates in portion.For signal receive process, the radiation fin 12 receives signal from extraneous all directions, most of signal receive after with
Metal floor constitutes transmission line structure, is transferred at polarized signal port, small part is launched away, guides piece 11 by described
It can be made to be received again by the radiation fin 12, to enhance wherein close to the signal of vertical direction by secondary reflection again afterwards
The gain of signal close on vertical direction, so that the signal reception on this direction becomes strong.For signal emission process,
It is the inverse process of signal receive process, this will not be repeated here.
Existing RFID antenna usually only has a polarized signal port, therefore can only receive a kind of polarized signal, this
Just improve the probability that skip is misread.For this purpose, in the present embodiment, being polarized by the first polarized signal port 20, second of setting
The transmitting-receiving of not co polar signal is realized in signal port 30, third polarized signal port 40, can greatly reduce single polarization
Skip is misread caused by antenna.
In addition, each polarized signal port cannot work at the same time, for this purpose, being also provided with phase for each polarized signal port
The switch answered controls the switching of the working condition of each polarized signal port by switching.Wherein, each switch can be two poles
Pipe ON-OFF control circuit.
In conclusion in the present embodiment, by the different location in antenna body 10 be arranged the first polarized signal port 20,
Second polarized signal port 30, third polarized signal port 40, realize the transmitting-receiving of not co polar signal, so that RFID days
Line can obtain the reliable communication range of rule, reduce the probability for misreading skip appearance.
Referring to Fig. 4, the utility model second embodiment additionally provides a kind of RFID reader, the RFID reader
Including read-write chip 200, controller 300 and the RFID antenna 100 as described in above-mentioned any embodiment；The controller 300
It is connect respectively with the first switch 50, second switch 60, third switch 70 and the read-write chip 200.
Specifically, in the present embodiment, the first switch 50, second switch 60, third are controlled by the controller 300
Switch 70 realizes the working condition of each polarized signal port, thus using time-multiplexed method, by each polarized signal
The signal that port is sent is aggregated into controller 300, then is sent to read-write chip 200 by the controller 300.
Since the communication of each RFID tag requires the regular hour, it is (a kind of how to distribute every kind of polarization mode
Polarization mode correspond to a polarized signal port) occupy the multiplexing time be also the emphasis for considering entire RFID reader performance.
In the present embodiment, it using Dynamic Programming working time method of adjustment, i.e., is received according to every kind of polarization mode
The specific gravity of RFID tag quantity carrys out the dynamic allocation works time.Specifically, when starting to work (in such as the 1st second), each
Polarization mode distributes identical time (i.e. every kind of polarization mode is distributed 1/3 second).When n-th second after start-up operation, the control
Device 300 processed can count the number of labels that every kind of polarization mode obtains in the second in 1- (n-1), then be determined according to these number of labels
The time that every kind of polarization mode needs to distribute in n-th second.For example, set the first polarized signal port, the second polarized signal port,
The number of labels that the corresponding polarization mode in third polarized signal port obtains within 1- (n-1) second is respectively as follows: Jn, Kn, Ln, then n-th
Every kind of polarization mode needs the time distributed can in second are as follows: Jn/(Jn+Kn+Ln), Kn/(Jn+Kn+Ln), Ln/(Jn+Kn+Ln).Such as
This, can make full use of the time of time-sharing multiplex, improve the read-write efficiency of RFID tag.
The preferable specific embodiment of the above, only the utility model, but the protection scope of the utility model is not
It is confined to this, anyone skilled in the art within the technical scope disclosed by the utility model, can readily occur in
Change or replacement, should be covered within the scope of the utility model.Therefore, the protection scope of the utility model should
It is subject to the protection scope in claims.
Claims (8)
1. a kind of RFID antenna characterized by comprising
Antenna body, the first polarized signal port, the second polarized signal port, third polarized signal port, first switch, second
Switch and third switch；
First polarized signal port, the second polarized signal port, third polarized signal port are set to the antenna body
Different location to realize the transmitting-receiving of not co polar signal；
The first switch is connect with the first polarized signal port electrical；The second switch and second polarized signal
Port electrical connection；Third polarized signal port and third switch are electrically connected.
2. RFID antenna according to claim 1, which is characterized in that
The first switch, second switch and third switch are diode switch control circuit.
3. RFID antenna according to claim 1, which is characterized in that the antenna body includes guiding piece, radiation fin, gold into
Possession plate and metal cylinder；
Wherein, piece, radiation fin, the metal floor of guiding into is connected to the metal cylinder, and the radiation fin is set to institute
It states and guides between piece and the metal floor；The radiation fin includes main part and extends from the different location of the main part
The first arm and the second arm out, and first arm is connect with second arm；
First polarized signal port is set on the first arm, and is connect with the metal floor；Second polarized signal
Port is set on the second arm, and is connect with the metal floor；Third polarized signal port is set to first arm
With the junction of second arm, and it is connect with the metal floor.
4. RFID antenna according to claim 3, which is characterized in that the length of the length of first arm and second arm
It spends identical；One end of first arm and one end of second arm are connected to the main part；The other end of first arm
And the other end of second arm vertically connects.
5. RFID antenna according to claim 3, which is characterized in that
First polarized signal port is arrived by the distance that first arm reaches the main part with by second arm
The corresponding phase difference of path length difference up to the distance of the main part is (2m ± 1/2) π, wherein m is integer；
Second polarized signal port is arrived by the distance that second arm reaches the main part with by first arm
The corresponding phase difference of path length difference up to the distance of the main part is (2n ± 1/2) π, wherein n is integer；
Third polarized signal port is arrived by the distance that first arm reaches the main part with by second arm
Distance up to the main part is equal.
6. RFID antenna according to claim 3, which is characterized in that first polarized signal port, the second polarization letter
Number port, third polarized signal port are the port of coaxial configuration.
7. RFID antenna according to claim 6, which is characterized in that first polarized signal port, the second polarization letter
Number port, third polarized signal port include inner core and shell, and the inner core is set in the shell；Wherein, described
Shell is connect with the metal floor；The inner core is connect with the radiation fin, to realize signal transmitting and receiving.
8. a kind of RFID reader, which is characterized in that including read-write chip, controller and such as claim 1 to 7 any one
The RFID antenna；The controller is connect respectively with the first switch, second switch, third switch and the read-write
Chip connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821027836.0U CN208477534U (en) | 2018-06-29 | 2018-06-29 | A kind of RFID antenna and RFID reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821027836.0U CN208477534U (en) | 2018-06-29 | 2018-06-29 | A kind of RFID antenna and RFID reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208477534U true CN208477534U (en) | 2019-02-05 |
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ID=65212259
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821027836.0U Active CN208477534U (en) | 2018-06-29 | 2018-06-29 | A kind of RFID antenna and RFID reader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208477534U (en) |
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2018
- 2018-06-29 CN CN201821027836.0U patent/CN208477534U/en active Active
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