CN107221739A - A kind of RFID reader antenna based on orthogonal slot technology - Google Patents
A kind of RFID reader antenna based on orthogonal slot technology Download PDFInfo
- Publication number
- CN107221739A CN107221739A CN201710439409.7A CN201710439409A CN107221739A CN 107221739 A CN107221739 A CN 107221739A CN 201710439409 A CN201710439409 A CN 201710439409A CN 107221739 A CN107221739 A CN 107221739A
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- gap
- medium substrate
- reader antenna
- rfid reader
- diagonal
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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
- H01Q1/2225—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 active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- 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
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- Waveguide Aerials (AREA)
Abstract
The invention discloses a kind of RFID reader antenna based on orthogonal slot technology, including medium substrate, print Z-shaped feeder line in the medium substrate back side, medium substrate front printing first, second, third, fourth and the 5th gap, first gap, the second gap and the 5th gap are symmetrical on medium substrate diagonal, and the 3rd gap and the 4th gap are symmetrical on medium substrate diagonal；Also include three PIN diodes, be separately positioned on the initial segment, interlude and the concluding paragraph in the second gap, the working condition of three PIN diodes is identical.Recognition circular polarization reader antenna disclosed by the invention covers general uhf band and WLAN frequency ranges, with size it is small, with it is wide, to insensitive, working frequency range restructural the good characteristic of polarizing.
Description
Technical field
The present invention relates to a kind of restructural double frequency round polarized antenna, and in particular to a kind of RFID based on orthogonal slot technology
Reader antenna.
Background technology
In recent years, RFID technique development is increasingly faster, gradually applied to storehouse management and retail trade system etc..UHF (superelevation
Frequency 0.9GHz) and WLAN (wireless MAN 2.45GHz) frequency range RFID (radio frequency identification) systems due to detection range it is remote,
The advantages of reading rate is soon and message transmission rate is high, shows advantage in many practical applications.The UHF frequencies of every country distribution
Section and disunity, therefore antenna needs covering 0.84-0.96GHz general uhf band.Typical RFID system has reader day
Line and label antenna composition, wherein label antenna is typically linear polarization.Because the polarization of label antenna has randomness, therefore
It is required that reader antenna has circular polarization characteristics to avoid polarization mismatch serious between reader antenna and label antenna.
The challenge of design RFID recognition circular polarization reader antennas at present is to keep to cover general uhf band while small size
(0.84-0.96GHz) and WLAN frequency ranges (2.4-2.48GHz).Common circular polarisation technology has following several：Radiation patch is cut
Angle, introduces perturbation unit, cross dipole antenna, using feeding network of 90 ° of phase differences etc. in square gap.But these
Method has the shortcomings that size is big and narrow bandwidth.Slot antenna has simple in construction, low section, is easy to impedance matching, bandwidth money
And high radiation efficiency.Therefore small size can be kept while broadband is reached using slit design circular polarized antenna.
The content of the invention
In order to overcome the shortcoming and deficiency that prior art is present, the present invention provides a kind of RFID based on orthogonal slot technology
Reader antenna, the reader antenna has the advantages that broadband, small size, makes easy, working frequency range restructural.
The present invention is adopted the following technical scheme that：
A kind of RFID reader antenna based on orthogonal slot technology, including medium substrate, the medium substrate back side print
Make Z-shaped feeder line, medium substrate front printing first, second, third, fourth and the 5th gap, first gap, second
Gap and the 5th gap are symmetrical on medium substrate diagonal, and the 3rd gap and the 4th gap are diagonal on medium substrate
Line is symmetrical；
Also include three PIN diodes, be separately positioned on the initial segment, interlude and the concluding paragraph in the second gap, described three
The working condition of PIN diode is identical.
First gap is made up of Liang Ge L-types branch, the orthogonal connection in long side of described two L-type branches, and on being situated between
The diagonal of matter substrate is symmetrical, and the short side of described two L-type branches is equipped with opening.
Second gap is made up of two orthogonal L-type branches, and second gap is located at two L-types in the first gap
In the region that branch surrounds.
3rd and the 4th gap is rectangle.
5th gap is made up of two mutually orthogonal rectangle branches.
Positioned at the PIN diode of the second gap interlude, the corresponding medium of tips branch in Z-shaped feeder line is specifically located at
On the position of substrate front side.
Beneficial effects of the present invention：
(1) it is proposed by the present invention to bend, be open, just compared with application RFID recognition circular polarization reader Antenna Designs
Cross-stitch gap can effectively reduce the size of antenna；
(2) circular polarisation bandwidth is effectively increased on the symmetrical gap of antenna diagonal by etching in the present invention, is covered
Cover general uhf band (0.84-0.96GHz) and WLAN frequency ranges (2.4-2.48GHz)；
(3) two working frequency range be able to will not be interacted with separately adjustable in the present invention；
(4) present invention in can by control 3 PIN diodes state, switch operating frequency range.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the scale diagrams of the embodiment of the present invention；
The return loss plot that embodiment is emulated after Fig. 3 installs for antenna in Fig. 1；
The axle that embodiment is emulated after Fig. 4 installs for antenna in Fig. 1 is than figure.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not
It is limited to this.
Embodiment
As shown in Figures 1 and 2, a kind of RFID reader antenna based on orthogonal slot technology, including medium substrate, it is described
The Z-shaped feeder line 6 of medium substrate back side printing, the front of medium substrate 8 printing first, second, third, fourth and the 5th gap 1,
2nd, 3,4,5, first gap 1, the second gap 2 and the 5th gap 5 are symmetrical on medium substrate diagonal, the 3rd seam
The gap 4 of gap 3 and the 4th is symmetrical on medium substrate diagonal, and the medium substrate diagonal is same, the present embodiment intermediary
Matter substrate diagonal be in medium substrate with the diagonal that horizontal plane positive direction angle is obtuse angle, effectively increase antenna circular polarisation
Bandwidth.
Also include three PIN diodes, be separately positioned on the initial segment 7a, interlude 7b and concluding paragraph 7c in the second gap,
The working condition of three PIN diodes is identical, while opening a way for closure or simultaneously, uhf band and WLAN frequencies are corresponded to respectively
Section mode of operation, so that the restructural to reaching working frequency range.
First gap 1 is made up of Liang Ge L-types branch, the orthogonal connection in long side of described two L-type branches, and on being situated between
The diagonal of matter substrate is symmetrical, and the short side of described two L-type branches is equipped with opening.
Second gap 2 is made up of two orthogonal L-type branches, and second gap is located at two L in the first gap
In the region that type branch surrounds, vertically connection forms similar M shapes structure on two sides of the Liang Ge L-types branch in second gap,
Adjacent edge angle is 90 degree in the M shapes structure, and three PIN diodes are located at the initial segment, the centre in the second gap respectively
Section and concluding paragraph, the initial segment are horizontal direction, and the concluding paragraph is vertical direction, and the second gap is diagonal on medium substrate
Line is symmetrical.
3rd gap 4 and the 4th gap 3 are rectangle, and two gaps are symmetrical on medium substrate diagonal, and the 3rd
Gap is horizontally arranged, is connected with medium substrate left side edge, and the 4th gap is set for vertical direction, with medium base
Plate upper edge is connected.
5th gap is made up of two mutually orthogonal rectangle branches, and it is diagonal that the 5th gap is located at medium substrate
The afterbody of line.
The Z-shaped feeder line 6 by three successively vertical branch constitute, the positive position of the corresponding medium substrate of its tips branch
The overlapping position put with the second gap interlude sets PIN diode, so that the circular polarisation bandwidth and impedance bandwidth in broadband are produced, this
Tips branch is horizontally arranged in embodiment.
Technical scheme implementation process is as follows：
It is the circular polarization characteristics for realizing the general uhf band of covering first.Medium substrate front printing one opening, it is curved
Folding, the first orthogonal gap, form the main body of uhf band circular polarization radiation, in the Z-shaped feeder line of medium substrate back up, feeder line
Near the first slit centers, the electric current shape phase difference in 90 ° in the orthogonal two-arm in the first gap, so as to realize entelechy
Change.Then in medium substrate front printing threeth gap symmetrical and orthogonal on antenna diagonal, the 4th gap and the 5th seam
Gap, makes circular polarisation bandwidth cover general uhf band.
Next to that realizing the circular polarization characteristics of WLAN frequency ranges, an opening, bending, the second orthogonal gap are printed, into
The main body of WLAN frequency range circular polarization radiations, makes Z-shaped feeder line by near the second slit centers, so as to realize entelechy in WLAN frequency ranges
Change characteristic.
Finally realize the restructural of working frequency range.It is located at the second seam respectively in positive three PIN diodes of medium substrate
Above the two ends of gap and microstrip line, the state of three PIN diodes is opened a way for closure or simultaneously simultaneously, and uhf band is corresponded to respectively
With WLAN band operational modes so that the restructural to reaching working frequency range.
In order to verify the validity of this programme, instantiation is given below and illustrates.
In this example, it is 4.4 from relative dielectric constant, loss angle tangent is 0.02, thickness is situated between for 0.8mm FR4
Matter substrate, the planar dimension of medium substrate is L × L, wherein L=98mm.The distance on the summit in the first gap to the substrate left side is
L1=59mm, the length in the third and fourth gap is L2=43.5mm, and an edge lengths in the 5th gap are L3=42mm.First seam
Most a width of W1=11mm of gap, the width in second, third and the 4th gap is respectively W2=5mm, W3=8mm, W4=10mm.
In actual implementation, with 50 ohm of coaxial line direct feed, the inner wire of coaxial line is connected with microstrip feed line, outer conductor and spoke
Paster is penetrated to be connected.
The return loss and axle ratio result of the RFID reader antenna emulation made with above-mentioned Fig. 2 illustrated dimensions are respectively as schemed
3 and Fig. 4.As seen from the figure, the RFID reader antenna is in 0.75-1.1GHz and 2.36-2.7GHz, and return loss is less than-
10dB, axle ratio is less than 3dB, covers general uhf band (0.84-0.96GHz) and WLAN frequency ranges (2.4-2.48GHz).
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by the embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (6)
1. a kind of RFID reader antenna based on orthogonal slot technology, it is characterised in that including medium substrate, the medium base
Back prints Z-shaped feeder line, medium substrate front printing first, second, third, fourth and the 5th gap, described first
Gap, the second gap and the 5th gap are symmetrical on medium substrate diagonal, and the 3rd gap is with the 4th gap on being situated between
Matter substrate diagonal is symmetrical；
Also include three PIN diodes, be separately positioned on the initial segment, interlude and the concluding paragraph in the second gap, three PIN
The working condition of diode is identical.
2. RFID reader antenna according to claim 1, it is characterised in that first gap is by Liang Ge L-types branch
Constitute, the orthogonal connection in long side of described two L-type branches, and, described two L-type branches symmetrical on the diagonal of medium substrate
Short side be equipped with opening.
3. RFID reader antenna according to claim 2, it is characterised in that second gap is by two orthogonal L
Type branch is constituted, and second gap is located in the region that the Liang Ge L-types branch in the first gap surrounds.
4. RFID reader antenna according to claim 1, it is characterised in that the 3rd and the 4th gap is square
Shape.
5. RFID reader antenna according to claim 1, it is characterised in that the 5th gap is mutually orthogonal by two
Rectangle branch constitute.
6. RFID reader antenna according to claim 1, it is characterised in that positioned at the PIN bis- of the second gap interlude
Pole pipe, is specifically located in Z-shaped feeder line on the positive position of the corresponding medium substrate of tips branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710439409.7A CN107221739B (en) | 2017-06-12 | 2017-06-12 | RFID reader antenna based on orthogonal slot technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710439409.7A CN107221739B (en) | 2017-06-12 | 2017-06-12 | RFID reader antenna based on orthogonal slot technology |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107221739A true CN107221739A (en) | 2017-09-29 |
| CN107221739B CN107221739B (en) | 2023-02-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710439409.7A Active CN107221739B (en) | 2017-06-12 | 2017-06-12 | RFID reader antenna based on orthogonal slot technology |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131182A (en) * | 2019-12-30 | 2021-07-16 | 华为技术有限公司 | Antenna and electronic equipment |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8804708D0 (en) * | 1988-02-29 | 1990-11-21 | Stc Plc | Crossed slot antenna |
| EP0831547A2 (en) * | 1996-09-20 | 1998-03-25 | Murata Manufacturing Co., Ltd. | Microstrip antenna |
| US20080143602A1 (en) * | 2006-12-18 | 2008-06-19 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Miniaturized orthogonal antenna system |
| WO2008113171A1 (en) * | 2007-03-19 | 2008-09-25 | Research In Motion Limited | Multi-band slot-strip antenna |
| FR2943185A1 (en) * | 2009-03-13 | 2010-09-17 | Thales Sa | Reconfigurable polarization patch antenna, has rectangular slits coupling microstrip patch with printed line to polarize patch according to directions, which are associated with rectangular slits |
| CN102544722A (en) * | 2012-01-04 | 2012-07-04 | 电子科技大学 | Polarization reconfigurable high-gain panel antenna |
| CN102832450A (en) * | 2012-07-02 | 2012-12-19 | 上海大学 | Novel dual-frequency and polarization reconfigurable antenna |
| US20130293433A1 (en) * | 2012-05-01 | 2013-11-07 | Fujitsu Limited | Antenna device |
| US20160211580A1 (en) * | 2015-01-21 | 2016-07-21 | Wistron Neweb Corporation | Microstrip Antenna Transceiver |
-
2017
- 2017-06-12 CN CN201710439409.7A patent/CN107221739B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8804708D0 (en) * | 1988-02-29 | 1990-11-21 | Stc Plc | Crossed slot antenna |
| EP0831547A2 (en) * | 1996-09-20 | 1998-03-25 | Murata Manufacturing Co., Ltd. | Microstrip antenna |
| US20080143602A1 (en) * | 2006-12-18 | 2008-06-19 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Miniaturized orthogonal antenna system |
| WO2008113171A1 (en) * | 2007-03-19 | 2008-09-25 | Research In Motion Limited | Multi-band slot-strip antenna |
| FR2943185A1 (en) * | 2009-03-13 | 2010-09-17 | Thales Sa | Reconfigurable polarization patch antenna, has rectangular slits coupling microstrip patch with printed line to polarize patch according to directions, which are associated with rectangular slits |
| CN102544722A (en) * | 2012-01-04 | 2012-07-04 | 电子科技大学 | Polarization reconfigurable high-gain panel antenna |
| US20130293433A1 (en) * | 2012-05-01 | 2013-11-07 | Fujitsu Limited | Antenna device |
| CN102832450A (en) * | 2012-07-02 | 2012-12-19 | 上海大学 | Novel dual-frequency and polarization reconfigurable antenna |
| US20160211580A1 (en) * | 2015-01-21 | 2016-07-21 | Wistron Neweb Corporation | Microstrip Antenna Transceiver |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113131182A (en) * | 2019-12-30 | 2021-07-16 | 华为技术有限公司 | Antenna and electronic equipment |
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| Publication number | Publication date |
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| CN107221739B (en) | 2023-02-14 |
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