CN104600424A - Circularly polarized anti-metal tag antenna - Google Patents
Circularly polarized anti-metal tag antenna Download PDFInfo
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- CN104600424A CN104600424A CN201510003454.9A CN201510003454A CN104600424A CN 104600424 A CN104600424 A CN 104600424A CN 201510003454 A CN201510003454 A CN 201510003454A CN 104600424 A CN104600424 A CN 104600424A
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- circular polarization
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- tag antenna
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Abstract
The invention discloses a circularly polarized anti-metal tag antenna. The circularly polarized anti-metal tag antenna comprises a dielectric slab, and a circularly polarized radiation patch and a metal floor which are respectively etched at the top and the bottom of the dielectric slab through a light etching technology, wherein the circularly polarized radiation patch is a corner cutting rectangle micro strip patch, at least on cross-line-shaped groove which extends towards the center of the corner cutting rectangle micro strip patch is arranged on each edge of the corner cutting rectangle micro strip patch, at least one cross groove is formed in the surface of a portion surrounded by each two adjacent cross-line-shaped grooves and the corresponding edge of the circularly polarized radiation patch, a groove body is arranged at the center of the circularly polarized radiation patch, an impedance matching wire is arranged in the circularly polarized radiation patch, an impedance matching branch node is arranged at one end of each cross-line-shaped groove, close to the groove body, and the impedance matching wire is connected with the circularly polarized radiation patch through a chip, and connected with the metal floor through a metal short circuit pin. The circularly polarized anti-metal tag antenna has a good impedance characteristic and a circular polarization characteristic, is compact in structure, and simple and clear in design thought, and can be directly installed on an object of a metal structure for use.
Description
Technical field
The present invention relates to field of radio frequency identification, be specifically related to a kind of circular polarization anti-metal tag antenna.
Background technology
Radio-frequency (RF) identification (RFID) carries out non-contacting two-way communication by electromagnetism or inductance coupling high, realizes automatically identifying to have precision high, the advantages such as adaptive capacity to environment is strong.The development of RFID technique facilitates the progress of Antenna Design and manufacture craft, especially in electronic label antenna, has defined a unique research field.Antenna is as the device of transmission and reception carrier information in rfid system, and its importance is self-evident.
In order to reduce costs, together with label antenna is connected directly between with label chip, and between chip and antenna, do not use match circuit and other elements.The performance of label antenna and the power consumption of label chip directly affect the performance of whole rfid system, as label sizes, decipherment distance and the compatibility etc. with labeling article.
Label antenna is broadly divided into general label antenna and anti-metal tag antenna according to environment for use difference.To identify product be metal or the other materials affecting antenna performance time, need anti-metal tag antenna be adopted.Anti-metal tag antenna is different according to the polarization of antenna, can be divided into linear polarization anti-metal tag antenna and circular polarization anti-metal tag antenna.In most rfid system, reader antenna adopts the antenna form of circular polarization, if label antenna adopts the antenna form of linear polarization, will cause the polarization mismatch between reading and writing device antenna and label antenna, thus reduces the attainable maximum read range of system.It should be noted that, if reader antenna adopts linear polarized antenna form, for ensureing maximum read range, propose harsher requirement by the putting position of linear polarization label antenna and orientation, this is obviously not easy to enforcement and the control of system.
At present linear polarization anti-metal tag antenna has a variety of on the market, but circular polarization anti-metal tag antenna is fewer, and the design of this mainly circular polarization anti-metal tag antenna is more difficult.Further developing in recent years along with rfid system, the anti-metal tag antenna of circular polarization comes into one's own gradually.
The correlative study achievement about circular polarization anti-metal tag antenna consecutive publications both at home and abroad.
The people such as external Horng-Dean Chen in 2012 publish an article " Coupling-FeedCircularly Polarized RFID Tag Antenna Mountable on MetallicSurface " on IEEE TRANSACTIONS ONANTENNAS AND PROPAGATION publication, in literary composition, radiation patch adopts rectangular patch form, realize circular polarization by " ten " font groove opened at paster center, and adopt inverted "L" shaped microstrip lines feed form.Calculating and experimental result show that the label antenna proposed can effectively increase maximum read range relative to traditional label antenna, and this antenna shapes structure is shown in Fig. 1 (a).
Within domestic 2013, He Lian magnitude people discloses a kind of small circularly-polarizedanti-metal anti-metal tag antenna (publication number: 201310677273.5 based on split ring resonator of Chinese patent, publication date: 20140409), the label antenna of crossed dipole type is proposed in patent, for realize antenna miniaturized oscillator in opened meandering line structure groove, realize circular polarization by the length adjusting two oscillators, and adopt opening resonance loop structure microstrip lines feed form.Simulation result shows that antenna performance is good, and this antenna shapes structure is shown in Fig. 1 (b).
Summary of the invention
The present invention aims to provide a kind of circular polarization anti-metal tag antenna with good impedance operator and circular polarization characteristics, compact conformation, grooving techniques is utilized to realize circular polarization anti-metal tag antenna miniaturized, and utilize microstrip antenna center zero potential characteristic, introduce cell body at center and realize miniaturization further, the spatial embedding impedance matching helix simultaneously utilizing cell body limited and impedance matching minor matters realize the compact circular polarization anti-metal tag antenna of new structure.
To achieve these goals, the present invention adopts following technical scheme:
A kind of circular polarization anti-metal tag antenna, comprise circular polarization radiation paster, dielectric-slab, metal floor, described circular polarization radiation paster and metal floor are etched in top and the bottom of described dielectric-slab respectively by photoetching technique; Described circular polarization radiation paster is corner cut rectangular microband paste, its every bar limit is equipped with at least one yi word pattern groove extended to paster center, and the part surface that every two adjacent yi word pattern grooves and circular polarization radiation patch edges surround is equipped with at least one cross groove; The core of described circular polarization radiation paster is provided with cell body, and its inside is provided with impedance matching line; Described yi word pattern groove is provided with impedance matching minor matters near one end of described cell body; Described impedance matching line is connected with described circular polarization radiation paster by chip, and is connected with described metal floor by short circuit metal post.
It should be noted that, by slotting in radiation patch, the path that the electric current in radiation patch can be made to flow through is elongated, thus the resonance frequency of antenna is reduced.Therefore, under identical resonance frequency, the antenna that described circular polarization radiation paster is slotted is little relative to the antenna of unslotted, thus realizes miniaturized.
It should be noted that, described impedance matching line and impedance matching minor matters the maximum power transfer that object is to realize between antenna and chip is set, require that the input impedance of antenna and the impedance of chip form conjugate impedance match.
It should be noted that, described yi word pattern groove is about the Central Symmetry of described circular polarization radiation paster.
It should be noted that, described impedance matching line is helical form.Impedance matching line is connected with metal floor by short circuit post, and object is the inductance that will form a ground connection, and helical form can make this part structure take up room less.
It should be noted that, described cell body is rectangular channel.
It should be noted that, described circular polarization radiation paster, dielectric-slab and metal floor are formed primarily of high-frequency microwave medium sheet material.
Beneficial effect of the present invention is: the present invention has good impedance operator and circular polarization characteristics, and compact conformation, and mentality of designing is simple and clear, can directly install and use in metal structure target.
Accompanying drawing explanation
The structural representation of two kind existing circular polarization anti-metal tag antennas of Fig. 1 for providing in background technology;
Fig. 2 is general structure schematic diagram of the present invention;
Fig. 3 is schematic cross-section of the present invention;
Fig. 4 is the structural representation of circular polarization radiation paster in Fig. 1;
Fig. 5 is the center close-up schematic view of Fig. 4;
Fig. 6 is real part of the present invention and imaginary impedance figure;
Fig. 7 is that axial ratio of the present invention is with frequency change figure;
Fig. 8 be the present invention when being arranged on the metal floor of different size gain with frequency change figure.
Embodiment
Below with reference to accompanying drawing, the invention will be further described, it should be noted that, the present embodiment, premised on the technical program, provide detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to the present embodiment.
As shown in Figure 2 and Figure 3, a kind of circular polarization anti-metal tag antenna, comprise circular polarization radiation paster 1, dielectric-slab 2, metal floor 3, described circular polarization radiation paster 1 adopts photoetching technique to be etched on dielectric-slab 2, and described metal floor 3 adopts photoetching technique to be etched in the bottom of described dielectric-slab 2.Described circular polarization radiation paster 1, dielectric-slab 2 and metal floor 3 are formed primarily of high-frequency microwave medium sheet material.
As shown in Figure 4, described circular polarization radiation paster 1 is corner cut rectangular microband paste, its four corners is equipped with corner cut 11, to realize the circular polarization characteristics of label antenna.Its every bar limit is equipped with at least one yi word pattern groove 13 extended to circular polarization radiation paster 1 center, described yi word pattern groove 13 is about described circular polarization radiation paster 1 Central Symmetry.And the part surface that every two adjacent yi word pattern grooves 13 and circular polarization radiation patch edges surround is equipped with at least one cross groove 12; Described yi word pattern groove 13 is provided with impedance matching minor matters 14 near the one end at circular polarization radiation paster center.
As shown in Fig. 2, Fig. 3 and Fig. 5, the core of described circular polarization radiation paster 1 is provided with rectangle cell body, and its inside is provided with impedance matching helix 15; Described impedance matching helix 15 is connected with described circular polarization radiation paster 1 by chip 5, and is connected with described metal floor 3 by short circuit metal post 4.The realization of impedance matching is particular by the length and the thickness that regulate impedance matching minor matters 14 and impedance matching helix 15.
As an embodiment, described circular polarization anti-metal tag antenna employing thickness of slab is that the FR4 sheet material of 1mm is made.The size of dielectric-slab is 70mm × 70mm, and metal floor size is consistent with dielectric-slab, and circular polarization radiation patch size is 47mm × 47mm, and described corner cut is the triangle of length of side 6mm; The length of described yi word pattern groove is 16.3mm, and width is 2mm, and the length of described cross groove is 16mm, and width is 1mm, and described rectangular channel is 8mm × 8mm.
Be illustrated in figure 6 emulated input impedance of the present invention, in figure, solid line is real part and dotted line is imaginary part.Find out at 900MHzRFID frequency range (920-925MHz) in figure, the resistance value (impedance of chip is 11-i141 ohm) of the antenna feed impedance real part of emulation and the value of imaginary part and chip is suitable.Therefore impedance of the present invention and and the impedance of chip can realize good conjugate impedance match.
Be illustrated in figure 7 emulation axial ratio of the present invention with frequency variation curve, in figure, find out that the axial ratio of antenna is functional at 900MHzRFID frequency range (920-925MHz).
Be illustrated in figure 8 the present invention when being arranged on the metal base plate of different size, the gain of emulation is with the curve of frequency change.Find out in figure that the size along with metal base plate increases, gain is obviously increased, and illustrates that the circular polarization anti-metal tag antenna operating state that the present invention proposes in metal environment is good.
For a person skilled in the art, according to above technical scheme and design, various corresponding change and distortion can be provided, and all these change and distortion all should be included within the protection range of the claims in the present invention.
Claims (5)
1. a circular polarization anti-metal tag antenna, comprise circular polarization radiation paster, dielectric-slab, metal floor, described circular polarization radiation paster and metal floor are etched in top and the bottom of described dielectric-slab respectively by photoetching technique, it is characterized in that: described circular polarization radiation paster is corner cut rectangular microband paste, its every bar limit is equipped with at least one yi word pattern groove extended to circular polarization radiation paster center, and the part surface that every two adjacent yi word pattern grooves and circular polarization radiation patch edges surround is equipped with at least one cross groove; The core of described circular polarization radiation paster is provided with cell body, and its inside is provided with impedance matching line; Described yi word pattern groove is provided with impedance matching minor matters near one end of described cell body; Described impedance matching line is connected with described circular polarization radiation paster by chip, and is connected with described metal floor by short circuit metal post.
2. a kind of circular polarization anti-metal tag antenna according to claim 1, is characterized in that, described yi word pattern groove is about described circular polarization radiation paster Central Symmetry.
3. a kind of circular polarization anti-metal tag antenna according to claim 1, is characterized in that, described impedance matching line is helical form.
4. a kind of circular polarization anti-metal tag antenna according to claim 1, is characterized in that, described cell body is rectangular channel.
5. a kind of circular polarization anti-metal tag antenna according to claim 1, is characterized in that, described circular polarization radiation paster, dielectric-slab and metal floor are formed primarily of high-frequency microwave medium sheet material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510003454.9A CN104600424A (en) | 2015-01-06 | 2015-01-06 | Circularly polarized anti-metal tag antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510003454.9A CN104600424A (en) | 2015-01-06 | 2015-01-06 | Circularly polarized anti-metal tag antenna |
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| CN104600424A true CN104600424A (en) | 2015-05-06 |
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| CN201510003454.9A Pending CN104600424A (en) | 2015-01-06 | 2015-01-06 | Circularly polarized anti-metal tag antenna |
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Cited By (10)
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| CN106252869A (en) * | 2016-09-11 | 2016-12-21 | 河南师范大学 | Electromagnetic wave energy collection system |
| CN106252867A (en) * | 2016-09-11 | 2016-12-21 | 河南师范大学 | Radio frequency efficient absorption antenna |
| CN106252864A (en) * | 2016-09-11 | 2016-12-21 | 河南师范大学 | Heptangle conversion electromagnetic energy reception antenna |
| CN106299654A (en) * | 2016-09-11 | 2017-01-04 | 河南师范大学 | High-gain radio-frequency (RF) energy collects antenna |
| CN106486741A (en) * | 2015-08-26 | 2017-03-08 | 香港中文大学 | A kind of air patch microstrip antenna |
| CN108682941A (en) * | 2018-06-07 | 2018-10-19 | 电子科技大学 | Solar energy circular polarized antenna |
| CN108777362A (en) * | 2018-06-05 | 2018-11-09 | 成都电科星天科技有限公司 | The high-gain circular polarisation satellite earth antenna of anti-metal |
| CN108832287A (en) * | 2018-06-20 | 2018-11-16 | 袁涛 | Three frequency range WiFi antennas |
| CN109509960A (en) * | 2019-01-22 | 2019-03-22 | 公安部交通管理科学研究所 | Ultrahigh frequency RFID anti-metal tag antenna |
| CN111162373A (en) * | 2019-12-13 | 2020-05-15 | 山东冠通智能科技有限公司 | RFID circular polarization air microstrip antenna |
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2015
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106486741A (en) * | 2015-08-26 | 2017-03-08 | 香港中文大学 | A kind of air patch microstrip antenna |
| CN106486741B (en) * | 2015-08-26 | 2020-04-17 | 香港中文大学 | Air patch microstrip antenna |
| CN106252869A (en) * | 2016-09-11 | 2016-12-21 | 河南师范大学 | Electromagnetic wave energy collection system |
| CN106252867A (en) * | 2016-09-11 | 2016-12-21 | 河南师范大学 | Radio frequency efficient absorption antenna |
| CN106252864A (en) * | 2016-09-11 | 2016-12-21 | 河南师范大学 | Heptangle conversion electromagnetic energy reception antenna |
| CN106299654A (en) * | 2016-09-11 | 2017-01-04 | 河南师范大学 | High-gain radio-frequency (RF) energy collects antenna |
| CN108777362A (en) * | 2018-06-05 | 2018-11-09 | 成都电科星天科技有限公司 | The high-gain circular polarisation satellite earth antenna of anti-metal |
| CN108682941A (en) * | 2018-06-07 | 2018-10-19 | 电子科技大学 | Solar energy circular polarized antenna |
| CN108832287A (en) * | 2018-06-20 | 2018-11-16 | 袁涛 | Three frequency range WiFi antennas |
| CN108832287B (en) * | 2018-06-20 | 2020-03-31 | 袁涛 | Three-frequency-band WiFi antenna |
| CN109509960A (en) * | 2019-01-22 | 2019-03-22 | 公安部交通管理科学研究所 | Ultrahigh frequency RFID anti-metal tag antenna |
| CN109509960B (en) * | 2019-01-22 | 2023-09-22 | 公安部交通管理科学研究所 | Ultrahigh frequency RFID anti-metal tag antenna |
| CN111162373A (en) * | 2019-12-13 | 2020-05-15 | 山东冠通智能科技有限公司 | RFID circular polarization air microstrip antenna |
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Application publication date: 20150506 |