CN209249681U - UHF RFID recognition circular polarization reader antenna - Google Patents
UHF RFID recognition circular polarization reader antenna Download PDFInfo
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- CN209249681U CN209249681U CN201920043174.4U CN201920043174U CN209249681U CN 209249681 U CN209249681 U CN 209249681U CN 201920043174 U CN201920043174 U CN 201920043174U CN 209249681 U CN209249681 U CN 209249681U
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Abstract
The utility model embodiment provides a kind of UHF RFID recognition circular polarization reader antenna, is related to antenna technical field.The UHF RFID recognition circular polarization reader antenna includes the earth plate being cascading, primary radiation patch and parasitic patch.Wherein, first through slot and two the second through slots there are two being opened up on primary radiation patch, two the first through slots are centrosymmetric distribution, two the second through slots are centrosymmetric distribution, two the first through slots and two the second through slots are staggeredly spaced setting, and the line of centres of two the first through slots and the line of centres of two the second through slots are mutually orthogonal.The UHF RFID recognition circular polarization reader antenna can either meet the requirement of antenna impedance bandwidth, axial ratio bandwidth and biggish gain, and can be realized the circular polarisation and miniaturization of antenna.
Description
Technical field
The utility model relates to antenna technical fields, in particular to a kind of UHF RFID recognition circular polarization reader antenna.
Background technique
Superfrequency (Ultra High Frequency, UHF) radio frequency identification (Radio Frequency
Identification, RFID) system is made of reader and label.Reader and label lead in its wireless range
Letter, and collect the information for the label being attached on object.Complete UHF RFID is generally by reader, electronic tag, software group
At.Entire identification process is that reader sends the reading signal of label by antenna in the form of an electromagnetic wave；Then,
Electronic tag receives the electromagnetic wave of reader transmission；Finally, label antenna transmits signal in a manner of electromagnetic backscatter
It is connected on antenna to reader.RFID reader antenna is one of RFID system critical elements.Country variant is applied in UHF
Frequency range in RFID system is different.UHF RFID system is generally operational in North America 902-928MHZ, European 865-
867MHZ and China 840-845MHz, 920-925MHZ.Therefore, a broadband day that can cover one or several frequency ranges is designed
Line is most important.
Although currently, RFID reader antenna in the market can have preferable impedance matching property, axial ratio bandwidth with
And biggish gain, but antenna size is larger, is unsatisfactory for requirement of most scenes to antenna miniaturization.
Utility model content
The purpose of this utility model includes providing a kind of UHF RFID recognition circular polarization reader antenna, can either meet antenna
The requirement of impedance bandwidth, axial ratio bandwidth and biggish gain, and can be realized the circular polarisation and miniaturization of antenna.
The embodiments of the present invention are achieved in that
A kind of UHF RFID recognition circular polarization reader antenna, including be cascading earth plate, primary radiation patch and post
Raw patch is opened up there are two the first through slot and two the second through slots on the primary radiation patch, during described two first through slots are in
The heart is symmetrical, and described two second through slots are centrosymmetric distribution, described two first through slots and described two second through slots
Staggeredly interval setting, the line of centres of described two first through slots and the line of centres of described two second through slots are mutually orthogonal.
Further, a wherein diagonal line for the line of centres of described two first through slots and the primary radiation patch is flat
Capable or concordant, the line of centres of described two second through slots is parallel with another diagonal line of the primary radiation patch or concordant.
Further, at least two L-type gaps for being centrosymmetric distribution are also provided on the primary radiation patch.
Further, one of L-type gap at least two L-type gap be located in one of the first through slot and
Between one of them second through slot, another L-type gap at least two L-type gap be located at another first through slot and
Between another second through slot.
Further, the primary radiation patch is respectively arranged with the first corner cut slot on its two opposite corner.
Further, the parasitic patch is respectively arranged with the second corner cut slot on its two opposite corner.
Further, the first air layer is provided between the earth plate and the primary radiation patch.
Further, the UHF RFID recognition circular polarization reader antenna further includes dielectric-slab, and the dielectric-slab is set to institute
It states between primary radiation patch and the parasitic patch, and the parasitic patch is attached on the dielectric-slab.
Further, the second air layer is provided between the dielectric-slab and the primary radiation patch.
Further, the UHF RFID recognition circular polarization reader antenna further includes coaxial probe, and the one of the coaxial probe
End is held in the primary radiation patch, and the other end passes through the earth plate.
The beneficial effect of UHF RFID recognition circular polarization reader antenna provided by the embodiment of the utility model include: by using
Earth plate and primary radiation patch are stacked, and are stacked parasitic patch on primary radiation patch, increase antenna bandwidth and
Gain, and open up on primary radiation patch two of two the first through slots of the distribution that is centrosymmetric and the distribution that is centrosymmetric
Second through slot, described two first through slots and described two second through slots, which are staggeredly spaced, to be arranged, in described two first through slots
Heart line and the line of centres of described two second through slots are mutually orthogonal, in this way, two the first through slots and two the second through slot shapes
At cross recess, the circular polarisation of antenna can be realized, and can reduce the size of antenna.Therefore, which reads
The requirement of antenna impedance bandwidth, axial ratio bandwidth and biggish gain can either be met by reading device antenna, and can be realized antenna
Circular polarisation and miniaturization.
Detailed description of the invention
It, below will be to use required in embodiment in order to illustrate more clearly of the technical solution of the utility model embodiment
Attached drawing be briefly described, it should be understood that the following drawings illustrates only some embodiments of the utility model, therefore should not be by
Regard the restriction to range as, for those of ordinary skill in the art, without creative efforts, may be used also
To obtain other relevant attached drawings according to these attached drawings.
Fig. 1 is that the three-dimensional stacked structure of UHF RFID recognition circular polarization reader antenna provided by the embodiment of the utility model is illustrated
Figure；Wherein, the first support construction and the second support construction is not shown in Fig. 1；
Fig. 2 is the side structure schematic view of UHF RFID recognition circular polarization reader antenna provided by the embodiment of the utility model；
Fig. 3 is the structural representation of the earth plate of UHF RFID recognition circular polarization reader antenna provided by the embodiment of the utility model
Figure；
Fig. 4 is the structure of the primary radiation patch of UHF RFID recognition circular polarization reader antenna provided by the embodiment of the utility model
Schematic diagram；
Fig. 5 is the irradiation structure schematic diagram of UHF RFID recognition circular polarization reader antenna provided by the embodiment of the utility model；
Wherein, Fig. 5 shows the location of coaxial probe；
Fig. 6 is the axis ratio (Axial of UHF RFID recognition circular polarization reader antenna provided by the embodiment of the utility model
Ratio, AR) schematic diagram；
Fig. 7 is showing for the return loss S11 of UHF RFID recognition circular polarization reader antenna provided by the embodiment of the utility model
It is intended to；
Fig. 8 is the radiation in XOZ plane of UHF RFID recognition circular polarization reader antenna provided by the embodiment of the utility model
Directional diagram.
Icon: 10-UHF RFID recognition circular polarization reader antenna；100- earth plate；200- primary radiation patch；210- first is logical
Slot；The second through slot of 220-；230-L type gap；240- the first corner cut slot；300- parasitic patch；310- the second corner cut slot；400-
One air layer；The first support construction of 410-；500- dielectric-slab；The second air layer of 510-；The second support construction of 520-；600- is coaxial
Probe.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model a part of the embodiment, instead of all the embodiments.Usually here in attached drawing description and
The component of the utility model embodiment shown can be arranged and be designed with a variety of different configurations.
Therefore, requirement is not intended to limit to the detailed description of the embodiments of the present invention provided in the accompanying drawings below
The scope of the utility model of protection, but it is merely representative of the selected embodiment of the utility model.Based in the utility model
Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all
Belong to the range of the utility model protection.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it should be understood that the orientation of the instructions such as term " on ", "lower", "inner", "outside"
Or positional relationship be based on the orientation or positional relationship shown in the drawings or the utility model product using when usually put
The orientation or positional relationship that orientation or positional relationship or those skilled in the art usually understand is merely for convenience of describing
The utility model and simplified description, rather than the equipment of indication or suggestion meaning or element must have a particular orientation, with spy
Fixed orientation construction and operation, therefore should not be understood as limiting the present invention.
In addition, term " first ", " second ", " third " etc. are only used for distinguishing description, it is not understood to indicate or imply
Relative importance.
In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, term " is set
Set ", " installation ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally
Connection；It can be mechanical connection, be also possible to be electrically connected；Can be directly connected, can also indirectly connected through an intermediary,
It can be the connection inside two elements.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
The concrete meaning of language in the present invention.
Referring to Fig. 1, present embodiments providing a kind of UHF RFID recognition circular polarization reader antenna 10, it is applied to UHF RFID
Reader, to realize the circle of antenna in the case where meeting the requirement of antenna impedance bandwidth, axial ratio bandwidth and biggish gain
Polarization and miniaturization.
Fig. 1 and Fig. 2 are please referred to, which includes the earth plate being cascading
100, primary radiation patch 200 and parasitic patch 300.Wherein, the first through slot 210 and two there are two being opened up on primary radiation patch 200
A second through slot 220.Two the first through slots 210 are centrosymmetric distribution, and two the second through slots 220 are centrosymmetric distribution.Two
A first through slot 210 and two the second through slots 220 are staggeredly spaced setting, and the line of centres of two the first through slots 210 and two the
The line of centres of two through slots 220 is mutually orthogonal.Optionally, in the present embodiment UHF RFID recognition circular polarization reader antenna 10 work
Centre frequency is in 915MHZ.
It should be noted that being stacked by using earth plate 100 and primary radiation patch 200, and in primary radiation patch
It is stacked parasitic patch 300 on 200, increases the bandwidth and gain of antenna.That is, on the basis of conventional microstrip antenna
On, it is additionally arranged the parasitic patch 300 being stacked, to increase the bandwidth and gain of antenna.Also, on primary radiation patch 200
Two the first through slots 210 and two the second through slots 220 are opened up, two the first through slots 210 and two the second through slots 220 form cross
Slot can be realized the circular polarisation of antenna, and can reduce the size of antenna.Therefore, the UHF RFID recognition circular polarization reader day
Line 10 can be realized circular polarisation and miniaturization.
Referring to Fig. 3, earth plate 100 is chosen as rectangular for being grounded.
Referring to Fig. 4, further, in this embodiment, primary radiation patch 200 is rectangular.During two the first through slots 210 are in
The heart is symmetrical, and the symmetrical centre of two the first through slots 210 is the center of main radiation patch 200；Two the second through slots 220 are in
Central symmetry distribution, and the symmetrical centre of two the second through slots 220 is the center of main radiation patch 200.In addition, two first logical
The line of centres of slot 210 is parallel with a wherein diagonal line for primary radiation patch 200 or concordant, in two the second through slots 220
Heart line is parallel with another diagonal line of primary radiation patch 200 or concordant.Further, in the same of primary radiation patch 200
On diagonal line, the spacing of two the first through slots 210 is equal with the spacing of two the second through slots 220.Optionally, the first through slot 210
Rectangular channel is all made of with the second through slot 220.
By carving four rectangular channels on primary radiation patch 200, across is organized, electric current perturbation is caused, generates amplitude phase
Together, 90 degree of phase phase difference of eigen mode, to form circular polarisation.
In addition, being also provided at least two L-type gaps 230 for being centrosymmetric distribution on primary radiation patch 200.This implementation
In example, the quantity in L-type gap 230 is two.Two L-type gaps 230 are centrosymmetric distribution, and pair in two L-type gaps 230
Center is referred to as the center of main radiation patch 200.Also, wherein the one of L-shaped one section of L-type gap 230 and primary radiation patch 200
Side is parallel, and L-shaped another section of L-type gap 230 is vertical with the side of above-mentioned primary radiation patch 200.
It should be noted that primary radiation patch 200 is respectively provided with orthogonal X-axis using its center as origin in the present embodiment
And Y-axis.Two L-type gaps 230 are arranged in X-axis.
By opening up the L-type gap 230 for the distribution that is centrosymmetric on primary radiation patch 200, antenna can be further reduced
Size, increase the bandwidth of antenna.
Optionally, one of L-type gap 230 at least two L-type gaps 230 is located in one of the first through slot
Between 210 and one of them second through slot 220, another L-type gap 230 at least two L-type gaps 230 is located at another
Between first through slot 210 and another second through slot 220.
In addition, primary radiation patch 200 is respectively arranged with the first corner cut slot 240 on its two opposite corner.By
The first corner cut slot 240 is opened up on primary radiation patch 200, being capable of forming meander reduces the resonance frequency of antenna.In the present embodiment, two
A first corner cut slot 240 is opened in primary radiation patch 200 on the diagonal line in 230 counter clockwise direction of L-type gap.Optionally,
It is formed on the adjacent two sides of the corner of primary radiation patch 200 and cuts out a rectangular channel respectively, two rectangular channels are connected in edge
It is logical, to form L-shaped first corner cut slot 240.
Referring to Fig. 5, in addition, parasitic patch 300 is substantially square.In the present embodiment, parasitic patch 300 is opposite at its
The second corner cut slot 310 is respectively arranged on two corners.Optionally, two the first corner cuts are located at the pair of horns of parasitic patch 300
On line, and the second corner cut slot 310 is corresponding with the position of the first corner cut slot 240.Second corner cut slot 310 can be triangle, this
In embodiment, the angle of the two sides of the edge of the trimming and parasitic patch 300 of the second corner cut slot 310 is 45 °.By
Second corner cut slot 310 is set in parasitic patch 300, further increases the bandwidth of antenna.
It should be noted that in the present embodiment, parasitic patch 300 using its center as origin, be respectively provided with orthogonal X-axis and
Y-axis.The X-axis of parasitic patch 300 is corresponding with the X-axis of primary radiation patch 200, the Y-axis and primary radiation patch 200 of parasitic patch 300
Y-axis it is corresponding.UHF RFID recognition circular polarization reader antenna 10 also has Z axis, and Z axis passes through the center of primary radiation patch 200 and posts
The center of raw patch 300.Earth plate 100, primary radiation patch 200 and parasitic patch 300 stack gradually on Z axis.
Please continue to refer to Fig. 2, in the present embodiment, the first air layer is provided between earth plate 100 and primary radiation patch 200
400, that is to say, that use air as medium between earth plate 100 and primary radiation patch 200.By the way that the first air layer is arranged
400, the bandwidth and gain of antenna can be increased, and reduce cost.
Further, UHF RFID recognition circular polarization reader antenna 10 can also include the first support construction 410, the first support
Structure 410 is set between earth plate 100 and primary radiation patch 200, is used to support primary radiation patch 200.Wherein, the first support
Structure 410 can be made of the dielectric constant foam identical or roughly the same with air.
In addition, UHF RFID recognition circular polarization reader antenna 10 further includes dielectric-slab 500, and dielectric-slab 500 is set in the present embodiment
It is placed between primary radiation patch 200 and parasitic patch 300, and parasitic patch 300 is attached on dielectric-slab 500.
Further, the second air layer 510 is provided between dielectric-slab 500 and primary radiation patch 200.That is, being situated between
Medium is used air as between scutum 500 and primary radiation patch 200.By the way that the second air layer 510 is arranged, antenna can be increased
Bandwidth and gain, and reduce cost.
Optionally, UHF RFID recognition circular polarization reader antenna 10 can also include the second support construction 520, the second support knot
Structure 520 is set between dielectric-slab 500 and primary radiation patch 200.Wherein, the second support construction 520 can use dielectric constant
Identical or roughly the same foam is made with air.
It should be noted that the rectangular primary radiation patch 200 of corner cut can generate elliptically polarised wave, and antenna will generate broadband
Circularly polarised wave needs parasitic patch 300 to possess suitably sized and position.This means that antenna circularly polarised wave dependent on two
The configuration of patch.As for the selection of the first air layer 400 and the dielectric thickness of the second air layer 510, dependent on working frequency
The needs of bandwidth and axis ratio.The present embodiment increases the impedance bandwidth and axial ratio bandwidth of antenna using antenna structure is stacked.
Please continue to refer to Fig. 5, further, UHF RFID recognition circular polarization reader antenna 10 further includes coaxial probe 600, together
One end of axis probe 600 is held in primary radiation patch 200, and the other end passes through earth plate 100.In the present embodiment, coaxial probe 600
Projection in parasitic patch 300 is located in the X-axis of parasitic patch 300.The antenna uses 600 SF single feed mode of coaxial probe,
Feed direction is X-direction.
Fig. 2~Fig. 5 is please referred to, introduces UHF RFID recognition circular polarization reader antenna 10 provided in this embodiment in detail below
Size.
The side length V1=178mm of earth plate 100, the side length V2=175mm of primary radiation patch 200, the ruler of parasitic patch 300
Very little Wx=145.8mm, the corner cut side length L1=22.4mm of the second corner cut slot 310 of parasitic patch 300, the first air layer 400
Thickness h=8mm, the thickness h 1=20.4mm of the second air layer 510, the width a=4.4mm of the first corner cut slot 240, the first corner cut
Slot 240 is in the length b1=32mm of 200 a side of primary radiation patch, and the first corner cut slot 240 is in another side of primary radiation patch 200
Length b2=28mm, the length d1=27mm of the first through slot 210, the width d2=14mm of the first through slot 210, two second are logical
Spacing d3=58mm, the length d4=34mm of the second through slot 220 between slot 220 are located at primary radiation patch 200X axis positive axis
On L shape gap turning outer corner point abscissa Xf=60mm, the L in the X-axis positive axis of primary radiation patch 200
Ordinate Yf=15mm, L the shape gap of the outer corner point at the turning in shape gap is in the length lx=on primary radiation patch 200Y axis
2mm, L shape gap are in the width w2=5mm in length ly=10mm, the L shape gap on primary radiation patch 200X axis.Coaxial probe
Distance D=33.1mm of 600 feed placement away from 200 center of primary radiation patch.
Fig. 6~Fig. 8 is please referred to, Fig. 6~Fig. 8 is obtained by the antenna of the above-mentioned size of use is emulated.Fig. 6 is the present embodiment
Axis ratio (Axial Ratio, AR) schematic diagram of the UHF RFID recognition circular polarization reader antenna of offer, wherein abscissa is frequency
(Frequency, Freq), unit MHz, ordinate are axis ratio Axial Ratio Value, upper right in unit dB, Fig. 6
The table at angle indicates calibration curve information (Curve Info), and the table in the upper left corner shows transverse and longitudinal coordinate (the m1 point of m1 point and m2 point
Sampled with m2 point with AR substantially 3dB), the table in the lower left corner shows the abscissa difference Delta (X) of m1 point and m2 point
With ordinate difference Delta (Y), the slope and backslash rate of m1 point and m2 point.Fig. 7 is UHF RFID entelechy provided in this embodiment
Change the schematic diagram of the return loss S11 of reader antenna, wherein abscissa is frequency Freq, unit MHz, and ordinate is back
S11 is lost in wave, and the table in the upper right corner indicates that calibration curve information Curve Info, the table in the upper left corner are shown in unit dB, Fig. 7
The transverse and longitudinal coordinate (m1 point and m2 point are sampled with S11 substantially -10dB) of m1 point and m2 point, the table in the lower left corner shows m1
The abscissa difference Delta (X) and ordinate difference Delta (Y) of point and m2 point, the slope and backslash rate of m1 point and m2 point.Fig. 8
For the antenna pattern (Radiation in XOZ plane of UHF RFID recognition circular polarization reader antenna provided in this embodiment
Pattern), wherein the table in the upper left corner shows curve 1 and 2, is set as last time adaptive curve last adaptive, right
The table at upper angle shows the coordinate of the sampled point m1 and m2 respectively on curve 1 and 2.It can be obtained by Fig. 6~Fig. 8, this implementation
UHF RFID recognition circular polarization reader antenna 10 is axis ratio AR < 3dB (wherein, AR for indicate circular polarization characteristics) the case where in example
Under, axial ratio bandwidth is 889.9~938MHz, and in return loss S11 < -10dB, (wherein, S11 is one in S parameter, is indicated back
Wave loss characteristic) in the case where, bandwidth is 885.9~953MHz, meets actual requirement well.The maximum gain of antenna is
7.9258dB gain is larger.
In conclusion UHF RFID recognition circular polarization reader antenna 10 provided by the embodiment of the utility model has size small
Feature increases the bandwidth and gain of antenna using parasitic patch 300 using antenna structure is stacked.With higher gain and larger
Front and back ratio, identification distance farther out, suitable for the scene having higher requirements to antenna gain；Using on primary radiation patch 200
It cuts cross recess and carves L-type gap 230, realize the circular polarisation and miniaturization of antenna, meet axis than the requirement with impedance bandwidth.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of UHF RFID recognition circular polarization reader antenna, which is characterized in that including be cascading earth plate, primary radiation
Patch and parasitic patch open up on the primary radiation patch there are two the first through slot and two the second through slots, described two first
Through slot is centrosymmetric distribution, and described two second through slots are centrosymmetric distribution, described two first through slots and described two
Second through slot is staggeredly spaced setting, the line of centres phase of the line of centres of described two first through slots and described two second through slots
It is mutually orthogonal.
2. UHF RFID recognition circular polarization reader antenna according to claim 1, which is characterized in that described two first through slots
The line of centres it is parallel with a wherein diagonal line for the primary radiation patch or concordant, the center of described two second through slots connects
Line is parallel with another diagonal line of the primary radiation patch or concordant.
3. UHF RFID recognition circular polarization reader antenna according to claim 1, which is characterized in that on the primary radiation patch
It is also provided at least two L-type gaps for being centrosymmetric distribution.
4. UHF RFID recognition circular polarization reader antenna according to claim 3, which is characterized in that at least two L-type
One of L-type gap in gap is located in one of between the first through slot and one of them second through slot, and described at least two
Another L-type gap in a L-type gap is located between another first through slot and another second through slot.
5. UHF RFID recognition circular polarization reader antenna according to claim 1, which is characterized in that the primary radiation patch exists
The first corner cut slot is respectively arranged on its two opposite corner.
6. UHF RFID recognition circular polarization reader antenna according to claim 1, which is characterized in that the parasitic patch is at it
The second corner cut slot is respectively arranged on two opposite corners.
7. UHF RFID recognition circular polarization reader antenna according to claim 1, which is characterized in that the earth plate and described
The first air layer is provided between primary radiation patch.
8. UHF RFID recognition circular polarization reader antenna according to claim 1, which is characterized in that the UHF RFID entelechy
Changing reader antenna further includes dielectric-slab, and the dielectric-slab is set between the primary radiation patch and the parasitic patch, and
The parasitic patch is attached on the dielectric-slab.
9. UHF RFID recognition circular polarization reader antenna according to claim 8, which is characterized in that the dielectric-slab and described
The second air layer is provided between primary radiation patch.
10. UHF RFID recognition circular polarization reader antenna according to claim 1, which is characterized in that the UHF RFID circle
The reader antenna that polarizes further includes coaxial probe, and one end of the coaxial probe is held in the primary radiation patch, and the other end is worn
Cross the earth plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920043174.4U CN209249681U (en) | 2019-01-10 | 2019-01-10 | UHF RFID recognition circular polarization reader antenna |
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| CN201920043174.4U CN209249681U (en) | 2019-01-10 | 2019-01-10 | UHF RFID recognition circular polarization reader antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110767983A (en) * | 2019-09-27 | 2020-02-07 | 宁波大学 | Ultrahigh frequency circularly polarized RFID tag antenna |
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2019
- 2019-01-10 CN CN201920043174.4U patent/CN209249681U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110767983A (en) * | 2019-09-27 | 2020-02-07 | 宁波大学 | Ultrahigh frequency circularly polarized RFID tag antenna |
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