CN105514621A - Near-field segmented line array antenna - Google Patents
Near-field segmented line array antenna Download PDFInfo
- Publication number
- CN105514621A CN105514621A CN201610086730.7A CN201610086730A CN105514621A CN 105514621 A CN105514621 A CN 105514621A CN 201610086730 A CN201610086730 A CN 201610086730A CN 105514621 A CN105514621 A CN 105514621A
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- CN
- China
- Prior art keywords
- line
- feeder line
- segmented
- director
- near field
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
-
- 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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
Abstract
The invention discloses a near-field segmented line array antenna which comprises a dielectric slab, a metal layer and capacitors. The metal layer comprises a feeder line, directors and a reflector, wherein the feeder line is composed of center-fed segmented lines, the directors are parallel to the feeder line and are composed of multiple segmented lines, and an outline of the reflector is composed of tapered lines linearly decreased from the middle to two sides. The directors and the reflector are respectively located on two sides of the feeder line. The capacitors are located among the segmented lines, and capacitance values of the capacitors on the same horizontal line are equal. The working frequency of the antenna depends on the resonance of the segmented lines and the capacitors. The directions of the currents on the feeder line and the directors are same by utilizing phase lag characteristics of the capacitors. Larger-area magnetic field uniformity of the antenna within a near-field range is achieved through multiple directors. In addition, the magnetic field intensity is strengthened by utilizing the reflector, and antenna matching is well achieved by adopting the tapered line structure of the reflector.
Description
Technical field
The invention belongs to Electromagnetic Field and Microwave Technology field.Be specifically related to a kind of electric larger-size near field antenna.
Background technology
Near field antenna is generally the structure of a kind of closed annular or closed-loop path.Near field antenna obtains investigation and application very widely in fields such as sensitive product tracking, transport, medical product, Medical Logistics and bio-sensings.But, near field antenna faces distinct issues when applying in above-mentioned field, namely need large area intensity in certain distance enough strong and uniform magnetic field, if when the electric size of near field antenna is larger, electric current will there will be significantly oppositely, magnetic field intensity can be caused uneven, affect the correlated performance of near field antenna, such as: near field antenna reading theory step-down, exists too much blind area.Therefore, the near field antenna of electrically large sizes is a study hotspot in recent years.
The size of typical near-field antenna is approximately half operation wavelength, and the Area comparison be coiled into is little, needs further area increased.Be directed to this, the technology of current most of near field antenna area increased mainly uses reverse current pair, or the closed hoop that uses segmented line and parasitic capacitance structure to form or closedly to realize; But the former near field antenna exists larger reading blind area, the latter is because its closing structure can only area increased to a certain extent.Therefore, the near field antenna of the electrically large sizes that design is novel is further needed.
Summary of the invention
The object of the present invention is to provide a kind of near field segmented line array antenna, large-area field homogeneity can be realized, ensure that enough magnetic field intensitys simultaneously, have not by the feature that electrically large sizes affects.
The technical solution used in the present invention is as follows:
Near field segmented line array antenna, comprises dielectric-slab, metal level and capacitor, and metal level and capacitor are arranged on the upper surface of dielectric-slab, and current feed terminal is arranged on the lower surface of dielectric-slab; Described metal level comprises feeder line, director and reflector, and wherein, feeder line is made up of the segmented line of apex drive, and director is parallel with feeder line and be made up of multiple segmented line, and the profile of reflector is that the transition line linearly reduced toward both sides from centre is formed; Described director and reflector lay respectively at the both sides of feeder line; Described capacitor is between each segmented line, and the capacitance of capacitor on same level line is equal.
The hop count of the segmented line that described feeder line comprises is more than or equal to 12.
Further, the total length of described feeder line is wavelength corresponding to the operating frequency of 1.5 times.
Described director employing is multiple and arranged in parallel, and the segmentation hop count of each director and total length are all equal with described feeder line.
Further, the distance between each director is all equal with the distance between described feeder line and adjacent director.
The capacitance of described feedback on-trace capacitors becomes arithmetic progression with the capacitance often arranging capacitor on director.
Near field provided by the present invention segmented line array antenna is compared with existing near field antenna, and beneficial effect is:
(1) provide a kind of near field antenna of open loop form, broken the limitation of electric small-size, more Large-Area-Uniform and the magnetic field of sufficient intensity are provided;
(2) resonance of segmented line and capacitor determines the operating frequency of antenna; Utilize the delayed phase characteristic of capacitor, on feeder line He on each director, realize electric current in the same way, finally make antenna break through the limitation of electric small-size;
(3) by director, antenna achieves more large-area field homogeneity near field range;
(4) utilize reflector that magnetic field intensity is strengthened, and the structure of reflector transition line achieve the coupling of antenna well.
Accompanying drawing explanation
Fig. 1 (a) is the schematic three dimensional views of near field segmented line array antenna and (b) design parameter mark figure thereof that propose according to the present invention.
Fig. 2 is the simulation result figure of near field segmented line array antenna return loss proposed by the invention.
Fig. 3 is the simulation result figure of the magnetic field intensity at 50mm place directly near field antenna array antenna feed proposed by the invention.
Wherein, description of reference numerals is as follows: 1-dielectric-slab; 2-feeder line; 3-director; 4-reflector; 5-capacitor.
Embodiment
Below in conjunction with accompanying drawing, implement to be specifically described to a kind of near field provided by the invention segmented line array antenna:
A kind of near field segmented line array antenna of the present invention's design is as shown in Fig. 1 (a), comprise the feeder line 2 on dielectric-slab, seven directors 3 on dielectric-slab, a reflector 4 with transition line structure, its profile is that middle past both sides linearly reduce, and the capacitor 5 on same level direction between segmented line.
As Suo Shi Fig. 1 (b), the length of dielectric-slab is l, and wide is w, and thickness is h, and the length of feeder line is l
1, wide is w
1, the shortest spacing between inverter and feeder line is l
2, the spacing of segmented line is d, and the distance of the spacing of each director and feeder line and nearest director is s.
The operating frequency that the present invention designs according to Fig. 1 is at the near field segmented line array antenna of 920MHz, and the dielectric constant of its medium substrate is 4.4, the length l=600mm of medium substrate, and width is w=450mm thickness is h=1.6mm, and the length of segmented line is l
1=37mm, width is w
1=5mm, spacing d=1mm, the distance of the spacing of each director and feeder line and nearest director is s=40mm, the beeline l between inverter and feeder line
2=10mm.
Fig. 2 uses HFSS simulation software to the simulation result figure of return loss of near field of the present invention segmented line array antenna with above-mentioned size, can see that the operating frequency range of this antenna-10dB is between 866MHz ~ 957MHz, resonance frequency, substantially at 920MHz place, meets the specification of domestic near field tag.
Fig. 3 is magnetic field intensity simulation result figure of the present invention, can see and in very large range achieve field homogeneity, is the magnetic field that can obtain sufficient intensity under the prerequisite of 30dBmW in input power.Simultaneously, feeder line total length in the present invention is 455mm, be about 1.5 times of operation wavelength, achieve the electrically large sizes design of near field antenna, and final reading area is 455mm × 300mm, girth is about the operation wavelength of 5 times, compared to some designs before, achieves the more large-area read-write of near field antenna.
Claims (6)
1. near field segmented line array antenna, comprises dielectric-slab, metal level and capacitor, it is characterized in that: metal level and capacitor are arranged on the upper surface of dielectric-slab, and current feed terminal is arranged on the lower surface of dielectric-slab; Described metal level comprises feeder line, director and reflector, and wherein, feeder line is made up of the segmented line of apex drive, and director is parallel with feeder line and be made up of multiple segmented line, and the profile of reflector is that the transition line linearly reduced toward both sides from centre is formed; Described director and reflector lay respectively at the both sides of feeder line; Described capacitor is between each segmented line, and the capacitance of capacitor on same level line is equal.
2. near field according to claim 1 segmented line array antenna, is characterized in that: the hop count of the segmented line that described feeder line comprises is more than or equal to 12.
3. near field according to claim 2 segmented line array antenna, is characterized in that: the total length of described feeder line is wavelength corresponding to the operating frequency of 1.5 times.
4. near field according to claim 1 segmented line array antenna, is characterized in that: described director employing is multiple and arranged in parallel, and the segmentation hop count of each director and total length are all equal with described feeder line.
5. near field according to claim 4 segmented line array antenna, is characterized in that: the distance between each director is all equal with the distance between described feeder line and adjacent director.
6. the near field segmented line array antenna according to claim 4 or 5, is characterized in that: the capacitance of described feedback on-trace capacitors becomes arithmetic progression with the capacitance often arranging capacitor on director.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610086730.7A CN105514621B (en) | 2016-02-16 | 2016-02-16 | Near field is segmented linear array antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610086730.7A CN105514621B (en) | 2016-02-16 | 2016-02-16 | Near field is segmented linear array antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105514621A true CN105514621A (en) | 2016-04-20 |
| CN105514621B CN105514621B (en) | 2018-02-09 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610086730.7A Expired - Fee Related CN105514621B (en) | 2016-02-16 | 2016-02-16 | Near field is segmented linear array antenna |
Country Status (1)
| Country | Link |
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| CN (1) | CN105514621B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2114898U (en) * | 1991-11-25 | 1992-09-02 | 倪工力 | Special high-efficient all-channel tv antenna |
| CN101009402A (en) * | 2007-01-19 | 2007-08-01 | 华南理工大学 | A RF labeling antenna with the directional line and bending line |
| US20090295659A1 (en) * | 2007-09-06 | 2009-12-03 | Blumberg Jr David | Rfid system |
| CN201649967U (en) * | 2010-04-07 | 2010-11-24 | 张维 | Electronic cabinet and monitoring system |
| CN102496776A (en) * | 2011-12-08 | 2012-06-13 | 南京大学 | Tag antenna capable of covering global UHF RFID frequency ranges, electronic tag |
| CN102693034A (en) * | 2010-12-23 | 2012-09-26 | 韩国电子通信研究院 | Touch input device and electromagnetic-wave transceiver using the same device |
| CN203179032U (en) * | 2013-04-11 | 2013-09-04 | 成都摩宝网络科技有限公司 | RFID card reader with elliptic segmented loop antennas |
| CN103390797A (en) * | 2013-08-01 | 2013-11-13 | 厦门信达物联科技有限公司 | Near-field antenna for ultrahigh-frequency reader-writer |
| CN104636693A (en) * | 2013-11-11 | 2015-05-20 | 恩智浦有限公司 | UHF-RFID antenna for point of sales application |
-
2016
- 2016-02-16 CN CN201610086730.7A patent/CN105514621B/en not_active Expired - Fee Related
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2114898U (en) * | 1991-11-25 | 1992-09-02 | 倪工力 | Special high-efficient all-channel tv antenna |
| CN101009402A (en) * | 2007-01-19 | 2007-08-01 | 华南理工大学 | A RF labeling antenna with the directional line and bending line |
| US20090295659A1 (en) * | 2007-09-06 | 2009-12-03 | Blumberg Jr David | Rfid system |
| CN201649967U (en) * | 2010-04-07 | 2010-11-24 | 张维 | Electronic cabinet and monitoring system |
| CN102693034A (en) * | 2010-12-23 | 2012-09-26 | 韩国电子通信研究院 | Touch input device and electromagnetic-wave transceiver using the same device |
| CN102496776A (en) * | 2011-12-08 | 2012-06-13 | 南京大学 | Tag antenna capable of covering global UHF RFID frequency ranges, electronic tag |
| CN203179032U (en) * | 2013-04-11 | 2013-09-04 | 成都摩宝网络科技有限公司 | RFID card reader with elliptic segmented loop antennas |
| CN103390797A (en) * | 2013-08-01 | 2013-11-13 | 厦门信达物联科技有限公司 | Near-field antenna for ultrahigh-frequency reader-writer |
| CN104636693A (en) * | 2013-11-11 | 2015-05-20 | 恩智浦有限公司 | UHF-RFID antenna for point of sales application |
Non-Patent Citations (2)
| Title |
|---|
| CHENG HUANG.ET AL: "Segmented line array antenna for UHF near field RFID application", 《7TH ASIA PACIFIC INTERNATIONAL SYMPOSIUM ON ELECTROMAGNETIC COMPATIBILITY》 * |
| JIN SHI.ET AL: "Electrically Large Dual-Loop Antenna for UHF Near-Field RFID Reader", 《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105514621B (en) | 2018-02-09 |
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Granted publication date: 20180209 Termination date: 20210216 |