CN201378631Y - RFID directional antenna array - Google Patents

RFID directional antenna array Download PDF

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Publication number
CN201378631Y
CN201378631Y CN200820223239U CN200820223239U CN201378631Y CN 201378631 Y CN201378631 Y CN 201378631Y CN 200820223239 U CN200820223239 U CN 200820223239U CN 200820223239 U CN200820223239 U CN 200820223239U CN 201378631 Y CN201378631 Y CN 201378631Y
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CN
China
Prior art keywords
antenna
described
end
rfid
power splitter
Prior art date
Application number
CN200820223239U
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Chinese (zh)
Inventor
严勇
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成都九洲电子信息系统有限责任公司
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Priority to CN200820223239U priority Critical patent/CN201378631Y/en
Application granted granted Critical
Publication of CN201378631Y publication Critical patent/CN201378631Y/en

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Abstract

The utility model relates to an RFID directional antenna array, comprising four antenna units, and the antenna unit is a paster antenna and all antenna units are arranged at interval to form a straight line; the antenna units are divided into two groups and each two antenna units form a group; and the two groups are respectively connected with one end of two power dividers, and the other end of the two power dividers is connected with one end of another power divider or a 3dB electrical bridge; another power divider or the 3dB electrical bridge is then connected with the input end of a radio frequency signal. The antenna unit, the phase shifter, the power divider or the 3dB electrical bridge are all arranged on a same PCB circuit board; and the PCB circuit board is also provided with a metal housing. The utility model has the advantages that on the one hand, the width of the antenna wave beam is enlarged, thus improving the radio frequency identification, on the other hand, the phase shifter is additionally arranged between the antenna unit and the power divider, then the direction of the antenna wave beam can be adjusted at any angle, thus avoiding changing the installation structure of the antenna unit for adjusting the antenna angle.

Description

A kind of RFID directional antenna array

Technical field

The utility model belongs to the REID field, relates in particular to a kind of RFID directional antenna array.

Background technology

RFID is the abbreviation of the English (Radio Frequency Identification) of REID, REID is a kind of automatic identification technology that begins to rise the nineties in 20th century, and REID is one and utilizes radiofrequency signal to realize that by space coupling (alternating magnetic field or electromagnetic field) contactless information transmission and the information of passing through to be transmitted reach the technology of identifying purpose.Radio-frequency (RF) identification (RFID) technology has obtained application more and more widely, particularly hyperfrequency (UHF) frequency range REID now, and very huge development potentiality is arranged.Uhf band RFID technology is considered to very rising industry at aspects such as logistics, warehousing managements at present.The most common scene is exactly the door that the RFID antenna is equipped with in article or people's discrepancy in logistics, storage, personal management, and the RFID reader just reads the article of coming in and going out by antenna.Existing RFID antenna mostly is circular plate antenna, as depicted in figs. 1 and 2, the wave beam of existing circular plate antenna is generally all narrower, when if article 4 pass through, too high or too low location tags 5 just may be outside beam area, the label card that personnel wear is too high or too low also may be outside beam area, thereby causes skip.In addition, as shown in Figure 1, the most basic mounting means of RFID antenna 2 is and doorframe 1 keeping parallelism, RFID antenna 2 sends antenna beam 3, but in the use of reality, can read information in advance in order to make the RFID reader, the inclination that need make RFID antenna 2 keep certain angle, as shown in Figure 2, make RFID antenna 2 and doorframe 1 keep the angle of 30 degree, the antenna beam 3 that sends also produces the angle of inclination of 30 degree.Generally speaking, the size of RFID antenna 2 wavelength about and the employed frequency range of RFID is approaching, and for example the electric wave wavelength of 915MHz is 32.7cm, and surveying some antenna sizes commonly used is 28cm~30cm.The thickness of this class antenna is generally 4cm~6cm.Ensconce door frames in some occasions will be with antenna, the thickness of doorframe needs 28cm * sin30 °+4cm=18cm approximately at least, and is that the size doorframe of this thickness generally is difficult to tolerate and very inaesthetic.

The utility model content

Above-mentioned deficiency at prior art, the utility model provides a kind of RFID directional antenna array, first purpose is to enlarge the width of antenna beam in vertical direction, and another purpose is to realize that by non-mechanical mode the RFID antenna sends the antenna beam of inclination.

To achieve these goals, the utility model has adopted following technical scheme: a kind of RFID directional antenna array, comprise four antenna elements, described antenna element is a paster antenna, and it is in alignment spatially to be distributed in distance, described antenna element in twos one group link to each other with an end of two power splitters respectively, the other end of described two power splitters links to each other with an end of another power splitter or 3dB electric bridge again, described another power splitter or 3dB electric bridge link to each other with the input of radiofrequency signal again; Above-mentioned antenna element, phase shifter, power splitter or 3dB electric bridge are installed on the same PCB circuit board, and described PCB circuit board also has the shell of metal material.

S=a λ is satisfied at above-mentioned interval, and wherein S is a spacing distance, and λ is the rf wave wavelength, and a is an interval coefficient.

In order to realize another purpose, also has phase shifter between described antenna element and the power splitter.

The beneficial effects of the utility model are: after using paster antenna to replace circular plate antenna as antenna element, effectively reduced the volume of antenna element, be convenient to more install, four paster antennas are arranged in a linear, further enlarge the width of antenna beam again, increased the effect of radio-frequency (RF) identification.In addition, after increasing phase shifter between antenna element and the power splitter, can adjust the direction of antenna beam at any angle, avoid structural change being made in the installation of antenna element in order to adjust angle.

Description of drawings

Fig. 1 is the mounting structure and the effect schematic diagram of antenna of the RFID reader of prior art.

Fig. 2 is the mounting structure schematic diagram behind the antenna deflection certain angle of RFID reader of prior art.

Fig. 3 is a principle assumption diagram of the present utility model.

Fig. 4 is the principle assumption diagram of embodiment 1 of the present utility model.

Fig. 5 is the principle assumption diagram of embodiment 2 of the present utility model.

Fig. 6 is the principle assumption diagram of embodiment 3 of the present utility model.

Fig. 7 is mounting structure of the present utility model and effect schematic diagram.

Description of reference numerals: doorframe 1, RFID antenna 2, antenna beam 3, article 4, label 5, antenna element 6, phase shifter 7, power splitter 8, power splitter 9,3dB electric bridge 10.

Embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Embodiment 1: as shown in Figure 3 and Figure 4, be provided with four antenna elements 6 in the present embodiment, all adopt finished product omnidirectional circularly-polarized patch antenna, antenna element 6 is arranged in a linear with a determining deviation, spacing satisfies formula S=a λ, and (S is a spacing distance, λ is the rf wave wavelength, a is an interval coefficient, the span of a can be between 0.15~0.35), get interval S=0.22 λ in the present embodiment, two antenna elements 6 are connected with a power splitter 8 by phase shifter 7 separately, phase shifter 7 is to adopt microstrip line to postpone to realize, feed differs 45 degree one by one between each phase shifter 7, because the phase shifts angle of one of them antenna element is 0 degree, thereby can dispense the phase shifter of this antenna element, power splitter adopts finished product miniature patch element, the other end of two power splitters 8 that connect with phase shifter 7 connects with same power splitter 9 again, and the other end of this power splitter 9 links to each other with the input of radiofrequency signal.Elements such as above-mentioned antenna element 6, phase shifter 7, power splitter 8, power splitter 9 are installed on the PCB circuit board, this PCB circuit board also has the shell of metal material, the double reflecting plate of doing of this metal shell, can with 180 spend to 360 the degree between antenna beam 3 reflex to 0 spend to 180 the degree between, the gain of aerial array is higher like this, and is also more practical.The spacing value of reflecting plate and PCB circuit board is 0.15 λ in the present embodiment.

The effect that present embodiment is realized as shown in Figure 7, antenna beam 3 left avertences are changeed 30 degree, gain more than 4dB, horizontal 3dB beamwidth 75 degree, vertical 3dB beamwidth 140 degree; And the horizontal 3dB beamwidth of existing circular polarization RFID plate aerial is 65 degree, vertical 3dB beamwidth 65 degree; Thereby the relative prior art of present embodiment is wide much at the beamwidth of vertical direction, so the label 5 on the very high and very low object 4 of easier read-out position.

Embodiment 2: as shown in Figure 5, present embodiment also is to adopt 45 degree of phase shift one by one to realize the inclination of antenna beam 3, basic structure is identical with embodiment 1, difference is to adopt a 3dB electric bridge 10 to replace the power splitter 9 that links to each other with the input of radiofrequency signal, the two ends of 3dB electric bridge 10 connect with two other power splitter 8 respectively, phase phasic difference 90 degree of the signal of 3dB electric bridge 10 two ends output, thereby only need two phase shifters 7 can realize 45 degree phase shifts between four antenna elements 6.

Embodiment 3: as shown in Figure 6, the basic structure of present embodiment is identical with embodiment 1, difference is to adopt phase shift one by one 60 degree to realize the inclination of antenna beam 3, thereby the phase difference between the phase shifter of each antenna element correspondence is 60 degree, spacing value 0.27 λ of antenna element.The antenna beam 3 left avertence gyrations of this example are about 42 degree, gain to more than the 5dB, horizontal 3dB beamwidth 57 degree, vertical 3dB beamwidth 120 degree.Compare example 1, the gain of aerial array is higher.

Those of ordinary skill in the art will appreciate that embodiment described here is in order to help reader understanding's principle of the present invention, should to be understood that protection range of the present utility model is not limited to such special statement and embodiment.Everyly make various possible being equal to according to foregoing description and replace or change, all be considered to belong to the protection range of claim of the present utility model.

Claims (3)

1. RFID directional antenna array, comprise four antenna elements, it is characterized in that, described antenna element is a paster antenna, and it is in alignment spatially to be distributed in distance, described antenna element in twos one group link to each other with an end of two power splitters respectively, the other end of described two power splitters links to each other with an end of another power splitter or 3dB electric bridge again, described another power splitter or 3dB electric bridge link to each other with the input of radiofrequency signal again; Above-mentioned antenna element, phase shifter, power splitter or 3dB electric bridge are installed on the same PCB circuit board, and described PCB circuit board also has the shell of metal material.
2. RFID directional antenna array according to claim 1 is characterized in that S=a λ is satisfied at described interval, and wherein S is a spacing distance, and λ is the rf wave wavelength, and a is an interval coefficient, and the value of a is between 0.15~0.35.
3. RFID directional antenna array according to claim 1 and 2 is characterized in that, also has phase shifter between described antenna element and the power splitter.
CN200820223239U 2008-12-08 2008-12-08 RFID directional antenna array CN201378631Y (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN200820223239U CN201378631Y (en) 2008-12-08 2008-12-08 RFID directional antenna array

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN200820223239U CN201378631Y (en) 2008-12-08 2008-12-08 RFID directional antenna array

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CN201378631Y true CN201378631Y (en) 2010-01-06

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CN200820223239U CN201378631Y (en) 2008-12-08 2008-12-08 RFID directional antenna array

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CN (1) CN201378631Y (en)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102520388A (en) * 2011-11-18 2012-06-27 天津大学 Positioning device using phased array principle and in combination with RSSI (Received Signal Strength Indicator) range measuring
CN102593588A (en) * 2011-11-21 2012-07-18 中国科学院合肥物质科学研究院 Scanning end-fire array antenna based on boundary scan test (BST) film phase shifter
CN102810769A (en) * 2012-07-31 2012-12-05 深圳市远望谷信息技术股份有限公司 Ultrahigh frequency broadband high-gain antenna
CN102820527A (en) * 2012-07-31 2012-12-12 深圳光启创新技术有限公司 Radar antenna and radar system
CN102820526A (en) * 2012-07-31 2012-12-12 深圳光启创新技术有限公司 Radar antenna and radar system
WO2012126405A3 (en) * 2012-04-20 2013-03-07 华为技术有限公司 Antenna, base station and beam processing method
CN103034886A (en) * 2012-12-03 2013-04-10 中国人民解放军济南军区72465部队 Device and method for locating and identification of active remote radio frequency tag
WO2013155889A1 (en) * 2012-04-20 2013-10-24 华为技术有限公司 Antenna, base station and beam processing method
CN103633452A (en) * 2013-11-28 2014-03-12 深圳市华为安捷信电气有限公司 Antenna and wireless signal transmitting and receiving method
CN103908078A (en) * 2014-03-28 2014-07-09 北京市第一中级人民法院 RFID (radio frequency identification device)-based archive storage system
CN104157976A (en) * 2014-07-29 2014-11-19 深圳市中兴物联科技有限公司 Antenna device and communication terminal
CN105264938A (en) * 2014-05-12 2016-01-20 华为技术有限公司 Antenna system
CN105322987A (en) * 2014-06-16 2016-02-10 智邦科技股份有限公司 Wireless network device and wireless network control method
CN105356050A (en) * 2015-11-11 2016-02-24 珠海纳睿达科技有限公司 Oriented wave beam variable double-array synthesis microstrip array antenna
CN107624226A (en) * 2015-07-28 2018-01-23 谷歌有限责任公司 Multibeam antenna system
CN105811109B (en) * 2016-03-14 2019-01-18 武汉虹信通信技术有限责任公司 A kind of big angle of declination electrical tilt antenna of high-gain
CN109921183A (en) * 2019-01-25 2019-06-21 北京邮电大学 A kind of frequency read/write antenna structure
WO2019149153A1 (en) * 2018-01-31 2019-08-08 华为技术有限公司 Communication apparatus

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102520388A (en) * 2011-11-18 2012-06-27 天津大学 Positioning device using phased array principle and in combination with RSSI (Received Signal Strength Indicator) range measuring
CN102593588A (en) * 2011-11-21 2012-07-18 中国科学院合肥物质科学研究院 Scanning end-fire array antenna based on boundary scan test (BST) film phase shifter
WO2013155889A1 (en) * 2012-04-20 2013-10-24 华为技术有限公司 Antenna, base station and beam processing method
US9673882B2 (en) 2012-04-20 2017-06-06 Huawei Technologies Co., Ltd. Antenna, base station, and beam processing method
WO2012126405A3 (en) * 2012-04-20 2013-03-07 华为技术有限公司 Antenna, base station and beam processing method
US8462047B1 (en) 2012-04-20 2013-06-11 Huawei Technologies Co., Ltd. Antenna, base station, and beam processing method
CN102820527B (en) * 2012-07-31 2015-11-25 深圳光启创新技术有限公司 A kind of radar antenna and radar system
CN102810769A (en) * 2012-07-31 2012-12-05 深圳市远望谷信息技术股份有限公司 Ultrahigh frequency broadband high-gain antenna
CN102820527A (en) * 2012-07-31 2012-12-12 深圳光启创新技术有限公司 Radar antenna and radar system
CN102820526A (en) * 2012-07-31 2012-12-12 深圳光启创新技术有限公司 Radar antenna and radar system
CN103034886A (en) * 2012-12-03 2013-04-10 中国人民解放军济南军区72465部队 Device and method for locating and identification of active remote radio frequency tag
CN103034886B (en) * 2012-12-03 2016-08-31 中国人民解放军济南军区72465部队 A kind of active remote radio frequency label positioning identifying method
CN103633452A (en) * 2013-11-28 2014-03-12 深圳市华为安捷信电气有限公司 Antenna and wireless signal transmitting and receiving method
CN103633452B (en) * 2013-11-28 2016-09-28 华为技术有限公司 A kind of antenna and wireless signal sending, receiving method
CN103908078A (en) * 2014-03-28 2014-07-09 北京市第一中级人民法院 RFID (radio frequency identification device)-based archive storage system
CN103908078B (en) * 2014-03-28 2016-10-26 北京市第一中级人民法院 Profile storage system based on RFID
US10205236B2 (en) 2014-05-12 2019-02-12 Huawei Technologies Co., Ltd. Antenna system
CN105264938A (en) * 2014-05-12 2016-01-20 华为技术有限公司 Antenna system
CN105322987A (en) * 2014-06-16 2016-02-10 智邦科技股份有限公司 Wireless network device and wireless network control method
CN105322987B (en) * 2014-06-16 2018-04-24 智邦科技股份有限公司 Radio network device and wireless network control method
CN104157976A (en) * 2014-07-29 2014-11-19 深圳市中兴物联科技有限公司 Antenna device and communication terminal
CN107624226A (en) * 2015-07-28 2018-01-23 谷歌有限责任公司 Multibeam antenna system
CN105356050A (en) * 2015-11-11 2016-02-24 珠海纳睿达科技有限公司 Oriented wave beam variable double-array synthesis microstrip array antenna
CN105356050B (en) * 2015-11-11 2019-06-07 珠海纳睿达科技有限公司 A kind of double arrays synthesis micro-strip array antennas of variable orientation wave beam
CN105811109B (en) * 2016-03-14 2019-01-18 武汉虹信通信技术有限责任公司 A kind of big angle of declination electrical tilt antenna of high-gain
WO2019149153A1 (en) * 2018-01-31 2019-08-08 华为技术有限公司 Communication apparatus
CN109921183A (en) * 2019-01-25 2019-06-21 北京邮电大学 A kind of frequency read/write antenna structure

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GR01 Patent grant
C56 Change in the name or address of the patentee

Owner name: CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO.,

Free format text: FORMER NAME: CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEMS CO., LTD.

CP01 Change in the name or title of a patent holder

Address after: The middle Tianfu Avenue in Chengdu city Sichuan province 610041 No. 765

Patentee after: Chengdu Jiuzhou Electronic Information System Co., Ltd.

Address before: The middle Tianfu Avenue in Chengdu city Sichuan province 610041 No. 765

Patentee before: Chengdu Jiuzhou Electronic Information Systems Co., Ltd.

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CX01 Expiry of patent term

Granted publication date: 20100106