CN103606756A - Small circularly-polarized antenna - Google Patents
Small circularly-polarized antenna Download PDFInfo
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- CN103606756A CN103606756A CN201310513236.0A CN201310513236A CN103606756A CN 103606756 A CN103606756 A CN 103606756A CN 201310513236 A CN201310513236 A CN 201310513236A CN 103606756 A CN103606756 A CN 103606756A
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Abstract
The invention relates to a small circularly-polarized antenna comprising a feeding plate and four radiation oscillators mounted on one side face of the feeding plate. The feeding plate is provided with a feeding network, and the feeding network has four output ends which are respectively connected with the four radiation oscillators and used for generating four equal-power signals, of which the phase difference is 90 degrees, and respectively outputting the four signals to the four radiation oscillators. The radiation oscillators are PIFA oscillators, and low-loss insulating medium or gas of which the dielectric constant is greater than 2 is filled between horizontal portions of the radiation oscillators and the surface of the feeding plate. According to the small circularly-polarized antenna provided by the embodiment of the invention, by filling high-dielectric-constant low-loss insulating medium between the PIFA radiation oscillators and the feeding plate, the size of the antenna is greatly reduced, circular polarization is realized, and meanwhile, the cost of production is lowered. Compared with the prior art, the small circularly-polarized antenna of the invention has the advantages of small size, low profile, good circular polarization performance, high gain and the like.
Description
Technical field
The present invention relates to RFID applied technical field, particularly a kind of small-sized circular polarized antenna.
Background technology
Radio-frequency (RF) identification is a kind of contactless automatic identification technology.In RFID(Radio Frequency Identification, radio-frequency (RF) identification) in system, identifying information leaves in electric data carrier, and electric data carrier becomes transponder.The identifying information of depositing in transponder is read by reader, and in some applications, reader not only can be read the information of depositing, and can be to transponder data writing, and this read-write operation is realized by bipartite radio communication.Microstrip antenna, as directional antenna form conventional in rfid system, has extremely important meaning to the development of RFID and application.
The structure of microstrip antenna early-stage development is the stack structure of plane formula together, afterwards along with frequency ratio, polarization require and integrated antenna volume on requirement, coordinate different feed-in modes and derive various different designs structures.In addition, solving in the problem of microstrip antenna narrow-band characteristic, various designs are constantly weeded out the old and bring forth the new, and the method for utilizing is also constantly developed and interosculates.
But current used method exists many deficiencies, can have influence on other performance index of antenna.For example, use grounding probe to load, in reduction antenna size, also can be with serving shortcoming: make impedance matching depend on the position of grounding probe and the distance of distributing point thereof on the one hand, to manufacturing tolerance, proposed harsh requirement; Be the problem of bandwidth reducing on the other hand, if use reactive components to load, can cause bandwidth reducing equally, if use resistive device, although contribute to launch frequency band, resistance element will reduce the efficiency of antenna to the consumption of energy.
Therefore, how to adopt new technology when realizing Miniaturized Microstrip Antennas multiband, broadband operation performance, take into account other performance index of antenna, as efficiency, gain, polarization etc., become the difficult point of current research.
Summary of the invention
The object of the invention is to, for deficiency of the prior art, provide a kind of small-sized circular polarized antenna, it has advantages of miniaturization, low section, high-gain and broadband.
For achieving the above object, the present invention is by the following technical solutions:
A small-sized circular polarized antenna, comprises feeder panel and is installed on four radiation a period of time on feeder panel one side, on described feeder panel, has feeding network; Described feeding network has four outputs, and described four outputs are connected with four radiation a period of time respectively, and, phase difference equal for generation of four road power is followed successively by the signal of 90 °, exports to respectively four radiation a period of time;
Described radiation a period of time is a period of time of PIFA form, is filled with low-loss and insulating medium or gas that dielectric constant is greater than 2 between the horizontal component in radiation a period of time and feeder panel surface.
Preferably, described feeder panel comprises the first to the 3rd insulation medium board and feeding network, described feeding network comprises first to fourth feed layer, the first feed layer, the first insulation medium board, the second feed layer, the second insulation medium board, the 3rd feed layer, the 3rd insulation medium board and the 4th feed layer stack gradually connection, and described four radiation a period of time are installed in the first feed layer.
Preferably, described insulation medium board is polyfluortetraethylene plate or FR-4 insulation board.
Preferably, described feeder panel is rectangle, and described four radiation a period of time install along the four edges of rectangle respectively.
Preferably, described radiation a period of time consists of stainless steel, foreign copper-nickel alloy or FPC.
Preferably, described the second feed layer and the 4th feed layer be ground connection respectively, which is provided with via hole; In described the 3rd feed layer, be provided with power splitter and phase shifter, described phase shifter is connected in one of them output of power splitter, and another output of power splitter and the output of phase shifter are connected to the first feed layer by the via hole in the second feed layer respectively; In described the first feed layer, be provided with two power splitters and two phase shifters, one of them output of each power splitter connects a phase shifter.
Preferably, described power splitter and phase shifter are co-planar waveguide, strip line or microstrip line.
A kind of small-sized circular polarized antenna that the embodiment of the present invention provides, by filling the low-loss and insulating medium of high-k between the radiation a period of time in PIFA form and feeder panel, success by the volume-diminished in radiation a period of time 2/3rds left and right, antenna size is only 45mm * 45mm * 5mm; Greatly reduce antenna volume, realized circular polarization, reduced production cost simultaneously.
With existing technology, compare, small-sized circular polarized antenna of the present invention has the advantages such as miniaturization, low section, circular polarization performance are good, high-gain.The present invention has not only overcome circular polarization microstrip antenna narrow bandwidth, bulky defect but also has simplified multiport feed system complicated shortcoming is installed, and has saved cost, is more applicable to the application of RFID industry.
Accompanying drawing explanation
Fig. 1 is the side structure schematic diagram of the embodiment of the present invention.
Fig. 2 is the vertical view of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment, technical scheme of the present invention is elaborated.
As depicted in figs. 1 and 2, a kind of small-sized circular polarized antenna that the embodiment of the present invention provides comprises feeder panel and is installed on four radiation a period of time 9 on feeder panel one side.On described feeder panel, have feeding network, described feeding network has four outputs, and described four outputs are connected with four radiation a period of time 9 respectively.For input signal is treated to, four road power equate described feeding network, phase difference is followed successively by the signal of 90 °, export to respectively four radiation a period of time 9.
Feeder panel in the embodiment of the present invention is sandwich construction, comprises the first insulation medium board 5, the second insulation medium board 6, the 3rd insulation medium board 7 and is fixed on one minute four multilayer feeding network therebetween.Wherein, the described first to the 3rd insulation medium board is the sheet materials such as polyfluortetraethylene plate or FR-4 insulation board.Described feeding network comprises the first feed layer 1, the second feed layer 2, the 3rd feed layer 3 and the 4th feed layer 4.Described the first feed layer 1, the first insulation medium board 5, the second feed layer 2, the second insulation medium board 6, the 3rd feed layer 3, the 3rd insulation medium board 7 and the 4th feed layer 4 stack gradually connection from top to bottom, and described four radiation a period of time 9 are installed in the first feed layer 1.
Preferably, as shown in Figure 2, described feeder panel is rectangle, and described four radiation a period of time 9 install along the four edges of rectangle respectively.
Wherein, described the second feed layer 2 and the 4th feed layer 4 be ground connection respectively, for entirely covering copper layer, and which is provided with via hole.In the 3rd feed layer 3, be provided with power splitter and phase shifter, described power splitter is for being divided into two the signal of feed-in; Described phase shifter is connected in one of them output of power splitter, for a wherein road output signal of power splitter is carried out to 180 ° of phase shifts; Another output of power splitter and the output of phase shifter are connected to the first feed layer 1 by the via hole in the second feed layer 2 respectively, and the signal that is 180 ° by two-way constant amplitude, phase difference is inputted the first feed layer 1.In the first feed layer 1, be provided with two power splitters and two phase shifters, described two power splitters are for being divided into four road signals by the two paths of signals of the 3rd feed layer 3 feed-ins; One of them output of each power splitter connects a phase shifter, for the wherein road output signal to power splitter, carries out 90 ° of phase shifts; Finally, by the first feed layer 1, to the signal that four radiation a period of time 9 output, four road power equate, phase difference is followed successively by 90 degree, realize the circular polarization of antenna.Wherein, above-described power splitter and phase shifter can be co-planar waveguide, strip line or microstrip line.
Preferably, in embodiments of the present invention, described radiation a period of time 9 is PIFA(Planar Inverted-F Antenna, planar inverted F-shape antenna) a period of time of form.A period of time of PIFA form comprises vertical component and horizontal component, the lower end of described vertical component is vertically fixed on feeder panel, the upper end of vertical component is connected with horizontal component, and described horizontal component is parallel with feeder panel, the whole shape that forms " F " who lies down.Wherein, described radiation a period of time 9 is by FPC(Flexible Printed Circuit, flexible printed circuit board) form, in addition, described radiation a period of time 9 also can be made by stainless steel, foreign copper-nickel alloy or other metallic conductors.
Further, there are 2 pins in each radiation a period of time 9, and one of them is connected with the first feed layer 1, for feed; Another one is by the second feed layer 2 ground connection.A period of time of this PIFA form has not only been improved the stability of antenna performance, but also has significantly dwindled antenna volume.
Between the horizontal component in radiation a period of time 9 and feeder panel surface, be filled with low-loss and insulating medium or gas that dielectric constant is greater than 2, as FR-4, poly-four Buddhist ethene etc.The thickness of described low-loss and insulating medium and large I are adjusted according to actual engineering design demand.As shown in Figure 1, in the embodiment of the present invention, the whole spaces between the horizontal component in radiation a period of time 9 and feeder panel surface are filled up by low-loss and insulating medium 8, and described radiation a period of time 9 is attached on described low-loss and insulating medium 8.Because four radiation a period of time 9 are attached on the low-loss and insulating medium 8 of high-k, larger according to same frequency dielectric constant, the principle that wavelength is less, the volume of antenna has been got back and has further been dwindled, and this is the key that antenna in the embodiment of the present invention is realized miniaturization.
The working frequency range of small-sized circular polarized antenna of the present invention can be the hyperfrequency of RFID, can be also the frequency ranges such as 433MHz or 2.4GHz.By regulating the horizontal component in width, length and radiation a period of time 9 of microstrip line on the size in radiation a period of time 9 and feeding network or strip line and the height between feeder panel, the working frequency range of adjustable antenna or bandwidth.
A kind of small-sized circular polarized antenna that the embodiment of the present invention provides, by filling the low-loss and insulating medium of high-k between the radiation a period of time in PIFA form and feeder panel, success by the volume-diminished in radiation a period of time 2/3rds left and right, antenna size is only 45mm * 45mm * 5mm; Greatly reduce antenna volume, realized circular polarization, reduced production cost simultaneously.
With existing technology, compare, small-sized circular polarized antenna of the present invention has the advantages such as miniaturization, low section, circular polarization performance are good, high-gain.The present invention has not only overcome circular polarization microstrip antenna narrow bandwidth, bulky defect but also has simplified multiport feed system complicated shortcoming is installed, and has saved cost, is more applicable to the application of RFID industry.
The above embodiment has only expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (7)
1. a small-sized circular polarized antenna, is characterized in that, comprises feeder panel and is installed on four radiation a period of time on feeder panel one side, on described feeder panel, has feeding network; Described feeding network has four outputs, and described four outputs are connected with four radiation a period of time respectively, and, phase difference equal for generation of four road power is followed successively by the signal of 90 °, exports to respectively four radiation a period of time;
Described radiation a period of time is a period of time of PIFA form, is filled with low-loss and insulating medium or gas that dielectric constant is greater than 2 between the horizontal component in radiation a period of time and feeder panel surface.
2. small-sized circular polarized antenna according to claim 1, it is characterized in that, described feeder panel comprises the first to the 3rd insulation medium board and feeding network, described feeding network comprises first to fourth feed layer, the first feed layer, the first insulation medium board, the second feed layer, the second insulation medium board, the 3rd feed layer, the 3rd insulation medium board and the 4th feed layer stack gradually connection, and described four radiation a period of time are installed in the first feed layer.
3. small-sized circular polarized antenna according to claim 2, is characterized in that, described insulation medium board is polyfluortetraethylene plate or FR-4 insulation board.
4. small-sized circular polarized antenna according to claim 1, is characterized in that, described feeder panel is rectangle, and described four radiation a period of time install along the four edges of rectangle respectively.
5. small-sized circular polarized antenna according to claim 1, is characterized in that, described radiation a period of time consists of stainless steel, foreign copper-nickel alloy or FPC.
6. small-sized circular polarized antenna according to claim 2, is characterized in that, described the second feed layer and the 4th feed layer be ground connection respectively, which is provided with via hole; In described the 3rd feed layer, be provided with power splitter and phase shifter, described phase shifter is connected in one of them output of power splitter, and another output of power splitter and the output of phase shifter are connected to the first feed layer by the via hole in the second feed layer respectively; In described the first feed layer, be provided with two power splitters and two phase shifters, one of them output of each power splitter connects a phase shifter.
7. small-sized circular polarized antenna according to claim 6, is characterized in that, described power splitter and phase shifter are co-planar waveguide, strip line or microstrip line.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310513236.0A CN103606756A (en) | 2013-10-25 | 2013-10-25 | Small circularly-polarized antenna |
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| CN201310513236.0A CN103606756A (en) | 2013-10-25 | 2013-10-25 | Small circularly-polarized antenna |
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| CN103606756A true CN103606756A (en) | 2014-02-26 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017067032A1 (en) * | 2015-10-19 | 2017-04-27 | 叶雷 | Gnss signal receiving antenna |
| CN107394371A (en) * | 2017-06-13 | 2017-11-24 | 东南大学 | The Big Dipper/GPS circular polarisation the reception antennas being produced on Watch glass dial plate |
| CN108172984A (en) * | 2017-12-01 | 2018-06-15 | 北京北方联星科技有限公司 | A kind of circular polarized antenna being made of multiple PIFA antennas |
| EP3367504A1 (en) | 2017-02-27 | 2018-08-29 | Sick AG | Antenna for an rfid reading device and method for transferring and/or receiving rfid signals |
| CN109728414A (en) * | 2018-12-28 | 2019-05-07 | 维沃移动通信有限公司 | A kind of antenna structure and terminal device |
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| US20090322631A1 (en) * | 2006-07-21 | 2009-12-31 | Commissariat A L'energie Atomique | Antenna and associated measurement sensor |
| CN102570017A (en) * | 2011-12-15 | 2012-07-11 | 东南大学 | Tri-band wide wave beam circular polarization microstrip antenna |
| US20120212386A1 (en) * | 2011-02-21 | 2012-08-23 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of National Defence | Wideband circularly polarized hybrid dielectric resonator antenna |
| CN103280630A (en) * | 2013-05-02 | 2013-09-04 | 苏州卡基纳斯通信科技有限公司 | Multi-frequency wide-beam circular polarization antenna |
| CN203536569U (en) * | 2013-10-25 | 2014-04-09 | 深圳市摩天射频技术有限公司 | Small circular polarized antenna |
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2013
- 2013-10-25 CN CN201310513236.0A patent/CN103606756A/en active Pending
Patent Citations (5)
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| US20090322631A1 (en) * | 2006-07-21 | 2009-12-31 | Commissariat A L'energie Atomique | Antenna and associated measurement sensor |
| US20120212386A1 (en) * | 2011-02-21 | 2012-08-23 | Her Majesty The Queen In Right Of Canada As Represented By The Minister Of National Defence | Wideband circularly polarized hybrid dielectric resonator antenna |
| CN102570017A (en) * | 2011-12-15 | 2012-07-11 | 东南大学 | Tri-band wide wave beam circular polarization microstrip antenna |
| CN103280630A (en) * | 2013-05-02 | 2013-09-04 | 苏州卡基纳斯通信科技有限公司 | Multi-frequency wide-beam circular polarization antenna |
| CN203536569U (en) * | 2013-10-25 | 2014-04-09 | 深圳市摩天射频技术有限公司 | Small circular polarized antenna |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017067032A1 (en) * | 2015-10-19 | 2017-04-27 | 叶雷 | Gnss signal receiving antenna |
| EP3367504A1 (en) | 2017-02-27 | 2018-08-29 | Sick AG | Antenna for an rfid reading device and method for transferring and/or receiving rfid signals |
| US10331995B2 (en) | 2017-02-27 | 2019-06-25 | Sick Ag | Antenna for an RFID reading apparatus and method for transmitting and/or receiving RFID signals |
| CN107394371A (en) * | 2017-06-13 | 2017-11-24 | 东南大学 | The Big Dipper/GPS circular polarisation the reception antennas being produced on Watch glass dial plate |
| CN108172984A (en) * | 2017-12-01 | 2018-06-15 | 北京北方联星科技有限公司 | A kind of circular polarized antenna being made of multiple PIFA antennas |
| CN109728414A (en) * | 2018-12-28 | 2019-05-07 | 维沃移动通信有限公司 | A kind of antenna structure and terminal device |
| CN109728414B (en) * | 2018-12-28 | 2020-06-05 | 维沃移动通信有限公司 | Antenna structure and terminal equipment |
| US11942674B2 (en) | 2018-12-28 | 2024-03-26 | Vivo Mobile Communication Co., Ltd. | Antenna structure and terminal device |
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Effective date of registration: 20150204 Address after: 518100, 1401c building, C6 building, Hengfeng Industrial Town, Xixiang street, Shenzhen, Guangdong, Baoan District Applicant after: Shenzhen Boda Intelligent Identification Technology Co., Ltd. Address before: 518057 South Guangdong province Shenzhen city Nanshan District high tech Zone South seven road No. 022 on the west side of building fifth unit T2-A-a Applicant before: SHENZHEN MYANTENNA RADIO FREQUENCY TECHNOLOGY CO., LTD. |
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Application publication date: 20140226 |