CN204179218U - A kind of uhf band anti-metal rfid interrogator antenna - Google Patents
A kind of uhf band anti-metal rfid interrogator antenna Download PDFInfo
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- CN204179218U CN204179218U CN201420593856.XU CN201420593856U CN204179218U CN 204179218 U CN204179218 U CN 204179218U CN 201420593856 U CN201420593856 U CN 201420593856U CN 204179218 U CN204179218 U CN 204179218U
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Abstract
The utility model discloses a kind of uhf band anti-metal rfid interrogator antenna, this antenna can produce and large-arealy be uniformly distributed magnetic field.The technical scheme adopted comprises: two-layer PCB substrate, coaxial fitting, upper surface metal conduction band, lower surface bending type metal conduction band and matched load.The utility model is by selecting the length of lower surface bending type metal conduction band and upper surface metal conduction band, and the phase-shift phase sum making them produce is the integral multiple of wavelength, thus forms large-area uniform magnetic field to greatest extent.The utility model has field homogeneity distribution, easily adjusts, not by the feature of metal environmental impact without read-write cavity, size.
Description
Technical field
The invention belongs to Antenna Construction Design technical field, relate to a kind of rfid interrogator antenna.
Background technology
RFID (Radio Frequency Identification, radio-frequency (RF) identification) technology is a kind of non-contacting automatic identification technology.Reading and writing device antenna plays key effect in rfid system.The frequency of reading and writing device antenna work may have low frequency (below 135kHz), high frequency (13.56MHz), hyperfrequency (860-960MHz) and microwave frequency band (more than 2.4GHZ) etc.Reading and writing device antenna divides according to operating distance, can be divided near field antenna and far field antenna.The near field read-write device antenna working in UHF (Ultra High Frequency, hyperfrequency) is highly suitable for work in narrow space.Because near field antenna is only closely locating just there is stronger electromagnetic field, the intensity of distance electromagnetic fields slightly far away is sharply weakening, and the far gain of this antenna is very low, so the large-area metal around antenna can't have an impact to the performance of antenna.
Because uhf band near field RFID reader-writer antenna has a lot of premium properties.But after the size of antenna is more than a wavelength, the magnetic field near it is just no longer even.In this field, the research having had a lot of scholar to be correlated with to increase the size of antenna, and has Related product to come out, such as: based on the antenna of coupling loop, the loop antenna amounted to, loop antenna etc. by lumped capacity compensation of phase.But the size of these antenna is still large not, cannot apply in the scene such as file cabinet, large-scale shelf.The shelf antenna that document " RFID Smart Shelf with Confined Detection Volume at UHF; Carla R.Mederios; Jorge R.Costa; and Carlos A.Fernandes, IEEE Antennas and Wireless Propagation Letters, 2008; Vol.7; p773-776 " discloses a kind of microstrip line to realize, the change length that this antenna can be random, but width can not broaden.Document " Near-Field Antenna for RFID Smart Shelf in UHF, Wonkyu Choi, Jeong-Seok Kim, Ji-Hoon Bae, Gilyoung Choi, and Jong-Suk Chae, Antennas and Propagation Society International Syposiuim, 2009, p1-4 " disclose another kind of shelf antenna, adopt power splitter feeder line to be divided into the parallel microstrip line of a lot of root, then by a lot of root gaps on floor, electric field energy is coupled away, this method is owing to there being power splitter, so the electric current on every root line all can reduce, because reduce the reading/writing distance of antenna.
Utility model content
The deficiency that on every root line, electric current reduces is caused in order to overcome after prior art adopts power splitter, and under all-metal environment the defect of unstable properties, the invention provides a kind of uhf band be applied to all-metal environment under large scale rfid interrogator antenna, this antenna can produce and large-arealy be uniformly distributed magnetic field.
The technical solution adopted for the present invention to solve the technical problems is: comprising: PCB substrate, coaxial fitting and metal conduction band, is characterized in that: upper strata PCB substrate and lower floor's PCB substrate are supported by several nonmetal posts and form air gap; The lower surface of upper strata PCB substrate has the metal conduction band of bending type; The upper surface of lower floor's PCB substrate has two metal conduction bands, lower surface covering metal; This metal underlying surface forms microstrip line together with air gap, two-layer PCB substrate and surface metal conduction band.Upper surface metal conduction band is connected with coaxial fitting and matched load.Signal, from coaxial fitting feed-in, through lower surface metal conduction band, finally arrives matched load.Lower surface metal conduction band can motivate stronger magnetic field perpendicular on the direction of conduction band, and adjustment upper surface bending type metal conduction band can make field homogeneity distribute, and does not have cavity, magnetic field.Select the length of lower surface bending type metal conduction band and upper surface metal conduction band, the phase-shift phase sum making them produce is the integral multiple of wavelength, can form large-area uniform magnetic field to greatest extent like this.
The invention has the beneficial effects as follows: do not have to adopt the technical method being realized field homogeneity distribution by multiple power splitter, but pass through the coupling of lower surface bending type metal conduction band and upper surface metal conduction band, produce the magnetic field of Large-Area-Uniform distribution; Change length and the width of antenna, the bending number of lower surface bending type metal conduction band and the length of upper surface metal conduction band, all little to the performance change of antenna, so the antenna of different size can be designed easily; Because signal long-distance transmission has decay, and lower surface bending type metal conduction band can play the booster action to antenna magnetic field, makes in the working range of antenna, and magnetic field can not be subject to metal environmental impact, steady operation.
Below in conjunction with drawings and Examples, the present invention is further described.
Accompanying drawing explanation
Fig. 1 is uhf band anti-metal rfid interrogator antenna structure view of the present invention
Fig. 2 is the top view of Fig. 1
Fig. 3 is the end view of Fig. 1
In figure, 1, upper strata PCB substrate; 2, lower floor's PCB substrate; 3, coaxial fitting; 4, Wilkinson power divider; 5, lower surface folded form metal conduction band; 6, upper surface metal conduction band; 7, matched load; 8, air gap; 9, metal covers overall
Embodiment
With reference to Fig. 1-3, the present invention by 1, upper strata PCB substrate; 2, lower floor's PCB substrate; 3, coaxial fitting; 4, Wilkinson power divider; 5, lower surface folded form metal conduction band; 6, upper surface metal conduction band; 7, matched load; 8, air gap; 9, metal covers overall composition
In the present embodiment, the width of upper strata PCB substrate 1 is 100mm, and length is 800mm, and thickness is 1.6mm; The width of lower floor's PCB substrate 2 is 125mm, and length is 800mm, and thickness is 1.6mm; Material is FR4.Two pieces of PCB substrate are supported by the nonmetal post that height is 2mm, form air gap 8.
In the present embodiment, signal arrives matched load 7 through two lower surface metal conduction bands 5 to the right from coaxial fitting 3.And under the effect of upper strata folded form metal conduction band 6, form large-area uniform steady magnetic field.
Should be understood that, the foregoing is only a kind of embodiment of the present invention.For those of ordinary skills, can increase or reduce the bending number of lower surface bending type metal conduction band 5 and the length of upper surface metal conduction band 6 easily, change the length of antenna; Increase or reduce the spacing of lower surface bending type metal conduction band 5 and two upper surface metal conduction bands 6, change the width of antenna.As long as the phase-shift phase sum ensureing lower surface bending type metal conduction band 5 and upper surface metal conduction band 6 is the integral multiple of wavelength.
Claims (3)
1. a uhf band anti-metal rfid interrogator antenna, comprise: PCB substrate, coaxial fitting and metal conduction band, is characterized in that: upper strata PCB substrate (1) and lower floor's PCB substrate (2) are supported by several nonmetal posts (3) and form air gap (4); The lower surface of upper strata PCB substrate has the metal conduction band (5) of bending type; The upper surface of lower floor's PCB substrate has two metal conduction bands (6), and lower surface is overall covering metal (7); Upper surface metal conduction band (6) is connected with coaxial fitting (8) and matched load (9); The phase-shift phase sum that lower surface bending type metal conduction band (5) and upper surface metal conduction band (6) produce is the integral multiple of wavelength.
2. uhf band anti-metal rfid interrogator antenna according to claim 1, is characterized in that: the metal conduction band (5) that the lower surface of upper strata PCB substrate has a bending type to realize upper surface two metal conduction bands (6) of lower floor's PCB substrate form the enhancing of field strength.
3. uhf band anti-metal rfid interrogator antenna according to claim 1, is characterized in that: the phase-shift phase sum that lower surface bending type metal conduction band (5) and upper surface metal conduction band (6) produce is the integral multiple of wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420593856.XU CN204179218U (en) | 2014-10-14 | 2014-10-14 | A kind of uhf band anti-metal rfid interrogator antenna |
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| CN201420593856.XU CN204179218U (en) | 2014-10-14 | 2014-10-14 | A kind of uhf band anti-metal rfid interrogator antenna |
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| CN204179218U true CN204179218U (en) | 2015-02-25 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107799873A (en) * | 2017-10-26 | 2018-03-13 | 苏州优函信息科技有限公司 | Near-field readers antenna and antenna array for unmanned cash register platform |
| CN109462026A (en) * | 2018-11-22 | 2019-03-12 | 南京思追特电子科技有限公司 | The microstrip line and super high frequency radio frequency recognition read-write machine of super high frequency radio frequency identification |
-
2014
- 2014-10-14 CN CN201420593856.XU patent/CN204179218U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107799873A (en) * | 2017-10-26 | 2018-03-13 | 苏州优函信息科技有限公司 | Near-field readers antenna and antenna array for unmanned cash register platform |
| CN107799873B (en) * | 2017-10-26 | 2024-01-09 | 苏州优函信息科技有限公司 | Near field reader antenna and antenna array for unmanned cashier platform |
| CN109462026A (en) * | 2018-11-22 | 2019-03-12 | 南京思追特电子科技有限公司 | The microstrip line and super high frequency radio frequency recognition read-write machine of super high frequency radio frequency identification |
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