CN105305018A - RFID reader wave beam switching type array antenna - Google Patents
RFID reader wave beam switching type array antenna Download PDFInfo
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- CN105305018A CN105305018A CN201510632287.4A CN201510632287A CN105305018A CN 105305018 A CN105305018 A CN 105305018A CN 201510632287 A CN201510632287 A CN 201510632287A CN 105305018 A CN105305018 A CN 105305018A
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Abstract
The invention relates to an RFID reader wave beam switching type array antenna and belongs to the radio frequency identification technology and antenna technology field. The RFID reader wave beam switching type array antenna comprises four antenna radiation units, an electrical control phase shifter, a power divider and an attenuator, wherein the antenna radiation units employ a microstrip antenna mode to realize miniaturization of reader antennas, a radiation paster is provided with a groove, a dielectric layer is an air layer, a grounding face is a flat bonded copper, a coaxial line feeding mode is utilized, phase control on an output signal can be realized by the electrical control phase shifter through a main chip, so the wave beam switching function is realized; the power divider is a quartering power divider formed by microstrip lines, the power divider is independently designed, the structure is simple, mounting is convenient, debugging is easy, amplitude attenuation for a signal current can be carried out through an attenuator, so the excitation amplitude proportion is satisfied. According to the RFID reader wave beam switching type array antenna, area scanning for labels can be carried out through a reader, the identification area of the reader is expanded, and guidance meaning is exerted on the RFID system.
Description
Technical field
The invention belongs to REID and antenna technical field, particularly relate to reader beam switchover type array antenna.
Background technology
RFID (radio-frequency (RF) identification) technology utilizes radiofrequency signal to carry out contactless two-way communication, automatically identifies destination object and obtain relevant information data to be successfully applied to the every field such as the manufacturing, logistic storage, communications and transportation, health care, public safety.It utilizes the Space Coupling of radiofrequency signal to realize the transmission of non-contact type data, and is reached the object identifying object by the mutual transmission of information.
The conventional maximum decipherment distance of reader is at about 10 meters, and total identified region is limited, can't meet the demand of most of user, thus limits its large-scale application.Antenna is as reader important component part, it is the key factor realizing RFDC, antenna parameter (gain, antenna pattern etc.) directly affects the location etc. of the decipherment distance of reader, identified region and label, thus affects the performance of reader.Traditional reader antenna has the antenna pattern of low gain, broad beam, and thus make decipherment distance, identified region is restricted, tag location error is larger.
Smart antenna can utilize the combination of multiple bay to carry out signal transacting, automatically adjustment transmitting and receiving directional diagram, to reach best performance for different signal environments.Intelligent antenna technology is applied in rfid system, the maximum decipherment distance of existing reader, overlay area, location and the performance such as anti-interference can be improved.Very large attention is obtained in recent years in smart antenna application to RFID reader.
Smart antenna can be divided into fixed beam antenna, beam switchover type smart antenna and adaptive smart antenna by the difference of operation principle.Wherein beam switchover type smart antenna have structure simple, the advantages such as subscriber signal arrival direction and fast response time need not be differentiated, the more important thing is that the same wave beam of up link also can be used for down link, thus also can provide gain on the uplink, its potential using value obtains increasing attention both at home and abroad.
When label antenna received power is constant, increasing decipherment distance will increase transmitting power or increase reader antenna gain, and the increase of simple beam or fixed beam antenna gain reduces beamwidth, reduces the coverage of reader.Beam switchover type array antenna increases the gain of antenna, wave beam narrows, because wave beam scans in a plurality of directions, so total identified region extends, as shown in Figure 1, the area coverage sum of wave beam 1,2,3,4 is greater than the area coverage of single low gain fixed beam.
Summary of the invention
The invention provides a kind of reader beam switchover type array antenna, the object of expansion reader identified region can be reached.
In order to realize above-mentioned functions, embodiments of the invention adopt following technical scheme:
RFID reader beam switchover type array antenna, comprise antenna radiation unit, electronically controlled phase shifter, power divider, attenuator, it is characterized in that: described antenna radiation unit adopts microstrip antenna form, use coaxial feeding mode, described electronically controlled phase shifter can carry out phase control by master chip to providing signal, described power divider is the quartering power splitter that microstrip line is formed, and described attenuator is to signal code amplitude fading.
Antenna radiation unit provided by the invention, radiation patch uses fine copper plate, and ground level is used in the FR4 plate that one side covers copper, and dielectric layer uses air layer.Radiation patch, i.e. slot treatment on fine copper plate, radiation patch fluting size is respectively 67mm × 8mm, 25mm × 4mm, reduces antenna size, realizes miniaturized; Ground plate is slotted, and is of a size of 30mm × 3mm, reduces the back lobe level of antenna, strengthens main beam gain.Antenna element separation λ/2, feed adopts end feedback form by coaxial line, and the quartering power splitter adopting microstrip line to form, designs separately, be connected by coaxial line with array antenna.Phase shifter between array antenna and power splitter, in order to the signal phase shift of every road.Because every road signal phase difference is identical, all with first via signal for benchmark, therefore, three phase shifters can be used to carry out real-time phase to signal and to move.Attenuator is in order to decay to signal amplitude, to meet excitation signal amplitude requirement.
Accompanying drawing illustrates:
In order to clearer explanation inventive embodiments or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, accompanying drawing in the following describes is only one embodiment of the present of invention, for those of ordinary skill in the art, not paying under the laborious prerequisite of creation, other accompanying drawing can also be obtained with reference to the accompanying drawings.
Fig. 1 is reader beam switchover type antenna scanning schematic diagram;
Fig. 2 is overall structure schematic diagram of the present invention;
Fig. 3 is reader array bay structural representation of the present invention;
Fig. 4 is array antenna array element feed probes structural representation of the present invention;
Fig. 5 is array antenna structure schematic diagram of the present invention;
Fig. 6 is the present invention four road power splitter structure schematic diagram.
Embodiment:
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the embodiment of the present invention is described in further detail.
Purport of the present invention proposes a kind of beam switchover type array antenna to realize the effective identification of reader to label, expands the identified region of reader.Institute's antenna array of carrying is short for reader decipherment distance, and the shortcomings such as identified region is little, expensive have important directive significance.
Below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Fig. 1 is reader beam switchover type antenna scanning schematic diagram, when label antenna received power is constant, increase decipherment distance will increase transmitting power or increase reader antenna gain, the increase of simple beam or fixed beam antenna gain reduces beamwidth, reduces the coverage of reader.Beam switchover type array antenna increases the gain of antenna, wave beam narrows, because wave beam scans in a plurality of directions, so total identified region extends, as shown in Figure 1, the area coverage sum of wave beam 1,2,3,4 is greater than the area coverage of single low gain fixed beam.A, B, C 3 are the half-power point of wave beam, and the crosspoint as each wave beam effectively can identify the label in whole region, has directive significance to the design of antenna array.
Fig. 2 is overall structure schematic diagram of the present invention, and Fig. 3 is reader array bay structural representation of the present invention, and array element selects micro-strip paster antenna form, and radiation patch uses fine copper plate, and ground level is used in the FR4 plate that one side covers copper, and dielectric layer uses air layer.Radiation patch, i.e. slot treatment on fine copper plate, radiation patch fluting size is respectively 67mm × 8mm, 25mm × 4mm, reduces antenna size, realizes miniaturized; Ground plate is slotted, and is of a size of 30mm × 3mm, reduces the back lobe level of antenna, strengthens main beam gain.This bay energisation mode uses coaxial feed, coaxial line connected mode is welded with the paving copper ground plane of lower floor by the crust of coaxial line, the heart yearn of coaxial line welds with the radiation patch on upper strata through through hole, Fig. 4 is array antenna array element feed probes structural representation of the present invention, because sub-miniature A connector does not meet the demand of antenna feed probe, antenna probe copper rod is connected with sub-miniature A connector by pyramidal structure.
Fig. 5 is array antenna structure schematic diagram of the present invention, and the present invention adopts 4 antenna linear array composition linear Array, distributing point spacing λ/2.Connect bay and phase shifter, attenuator, inventive antenna array adopts chebyshev function excitation, because excitation amplitude is different, use attenuator can regulate the ratio of current amplitude, in order to reach the object of beam switchover, add electronically controlled phase shifter at antennal interface, realize the real-time change of signal phase, to obtain the wave beam of demand.
Fig. 6 is the present invention four road power splitter structure schematic diagram, makes microstrip line quartering power splitter, normally can work, realize the function of power decile in frequency 860MHz ~ 960MHz according to Wilkinson power splitter principle.
In sum, the present invention relates to a kind of RFID reader beam switchover type array antenna, this invention will have important application in field of radio frequency identification.
It will be appreciated by those skilled in the art that accompanying drawing is the schematic diagram of an embodiment, the invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
The foregoing is only preferred embodiment of the present invention, do not limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1.RFID reader beam switchover type array antenna, comprise antenna radiation unit, electronically controlled phase shifter, power divider, attenuator, it is characterized in that: described antenna radiation unit adopts microstrip antenna form, use coaxial feeding mode, described electronically controlled phase shifter can carry out phase control by master chip to providing signal, and described power divider is the quartering power splitter that microstrip line is formed, and described attenuator can be decayed to signal amplitude.
2. according to right 1 requirement, described array antenna comprises 4 micro-strip paster antennas, it is characterized in that: 4 micro-strip paster antennas are identical, adopts coaxial feed mode, 4 antenna linear array composition linear Array, distributing point spacing λ/2.
3. according to right 2 requirement, described micro-strip paster antenna structure is simple, it is characterized in that: radiation patch uses fine copper plate, and ground level is used in the FR4 plate that one side covers copper, and dielectric layer uses air layer.
4. according to right 2 requirement, described microstrip antenna, is characterized in that: radiation patch, i.e. slot treatment on fine copper plate, reduces antenna size, realizes miniaturized, and ground plate fluting reduces the back lobe level of antenna, strengthens main beam gain.
5., according to right 4 requirement, described microstrip antenna, is characterized in that: radiation patch is of a size of 136mm × 100mm, and ground level is of a size of 168mm × 268mm.
6. according to right 2 requirement, described microstrip antenna feed mode, it is characterized in that: feed adopts end feedback form by coaxial line, and coaxial line connected mode is welded with the paving copper ground plane of lower floor by the crust of coaxial line, and the heart yearn of coaxial line welds with the radiation patch on upper strata through through hole.
7. according to right 1 requirement, described array antenna feeding classification is characterised in that: use chebyshev function excitation, make its array have low minor level of Denging.
8. according to right 1 requirement, described electronically controlled phase shifter is characterised in that: can shift in real time carrier signal according to control signal, to meet the demand of antenna feed.
9. according to right 1 requirement, described power divider is characterised in that: the quartering power splitter adopting microstrip line to form, and designs separately, is connected by coaxial line with array antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201510632287.4A CN105305018A (en) | 2015-09-29 | 2015-09-29 | RFID reader wave beam switching type array antenna |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510632287.4A CN105305018A (en) | 2015-09-29 | 2015-09-29 | RFID reader wave beam switching type array antenna |
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| CN105305018A true CN105305018A (en) | 2016-02-03 |
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| CN201510632287.4A Pending CN105305018A (en) | 2015-09-29 | 2015-09-29 | RFID reader wave beam switching type array antenna |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106207378A (en) * | 2016-07-13 | 2016-12-07 | 天津工业大学 | A kind of RFID reader beam switchover type smart antenna |
| CN106250788A (en) * | 2016-07-27 | 2016-12-21 | 天津工业大学 | The method of passive ultra-high frequency RFID system based on smart antenna suppression multi-path jamming |
| CN106656360A (en) * | 2016-12-30 | 2017-05-10 | 维沃移动通信有限公司 | Antenna system and mobile terminal |
| CN109073728A (en) * | 2016-02-12 | 2018-12-21 | 弗劳恩霍夫应用研究促进协会 | For determining the equipment and corresponding method of the position of transmitter |
| CN109462040A (en) * | 2018-10-30 | 2019-03-12 | 深圳市航天华拓科技有限公司 | Phased array antenna and RFID system applied to RFID system |
| CN111029741A (en) * | 2019-12-06 | 2020-04-17 | 京信通信技术(广州)有限公司 | Antenna array structure and communication equipment |
| CN111146579A (en) * | 2020-01-17 | 2020-05-12 | 惠州Tcl移动通信有限公司 | Antenna device and terminal equipment |
| CN112421218A (en) * | 2020-11-27 | 2021-02-26 | 重庆金美通信有限责任公司 | Multi-beam switching antenna |
| CN115828957A (en) * | 2023-02-16 | 2023-03-21 | 深圳市安威无线科技有限公司 | Phased antenna power distribution system based on RFID |
-
2015
- 2015-09-29 CN CN201510632287.4A patent/CN105305018A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109073728A (en) * | 2016-02-12 | 2018-12-21 | 弗劳恩霍夫应用研究促进协会 | For determining the equipment and corresponding method of the position of transmitter |
| US11693079B2 (en) | 2016-02-12 | 2023-07-04 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. | Device for determining a position of a transmitter and corresponding method |
| CN106207378A (en) * | 2016-07-13 | 2016-12-07 | 天津工业大学 | A kind of RFID reader beam switchover type smart antenna |
| CN106250788A (en) * | 2016-07-27 | 2016-12-21 | 天津工业大学 | The method of passive ultra-high frequency RFID system based on smart antenna suppression multi-path jamming |
| CN106656360A (en) * | 2016-12-30 | 2017-05-10 | 维沃移动通信有限公司 | Antenna system and mobile terminal |
| CN109462040A (en) * | 2018-10-30 | 2019-03-12 | 深圳市航天华拓科技有限公司 | Phased array antenna and RFID system applied to RFID system |
| CN111029741A (en) * | 2019-12-06 | 2020-04-17 | 京信通信技术(广州)有限公司 | Antenna array structure and communication equipment |
| CN111146579A (en) * | 2020-01-17 | 2020-05-12 | 惠州Tcl移动通信有限公司 | Antenna device and terminal equipment |
| CN112421218A (en) * | 2020-11-27 | 2021-02-26 | 重庆金美通信有限责任公司 | Multi-beam switching antenna |
| CN115828957A (en) * | 2023-02-16 | 2023-03-21 | 深圳市安威无线科技有限公司 | Phased antenna power distribution system based on RFID |
| CN115828957B (en) * | 2023-02-16 | 2023-06-30 | 深圳市安威无线科技有限公司 | Phased antenna power distribution system based on RFID |
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Application publication date: 20160203 |
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