CN101527391A - Plate-shaped feeding air-dielectric patch antenna - Google Patents
Plate-shaped feeding air-dielectric patch antenna Download PDFInfo
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- CN101527391A CN101527391A CN200910030782A CN200910030782A CN101527391A CN 101527391 A CN101527391 A CN 101527391A CN 200910030782 A CN200910030782 A CN 200910030782A CN 200910030782 A CN200910030782 A CN 200910030782A CN 101527391 A CN101527391 A CN 101527391A
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Abstract
The invention relates to a plate-shaped feeding air-dielectric patch antenna, in particular to a broadband patch antenna, and a bent metal plate in a definite shape is adopted as a feeding appliance to form an air patch antenna with small volume and wider bandwidth. A plate-shaped feeding sheet of the antenna comprises three metal plates which are connected into a right-angle ladder shape, a radiation unit is a rectangle patch, the center of antenna is fixed and supported by a metal supporting rod, and the antenna is fed by a coaxial joint, an inner conductor of a coaxial joint is welded with the plate-shaped feeding appliance together, and an outer conductor of the coaxial joint is arranged on a frustum earth plate. The invention has the advantages of small volume, simple structure and fabrication process and low cost, and can be used as a card reader antenna of a radio-frequency identification system with a 900-MHz frequency band.
Description
Technical field
What the present invention relates to is a kind of plate-shaped feeding air-dielectric patch antenna, and the crooked metal sheet by making definite shape realizes that as feed structure volume is less, the directional antenna of frequency band broad.The present invention is mainly used in the card reader of 900MHz frequency range radio-frequency recognition system, belongs to microwave technical field.
Background technology
In recent years, REID has obtained development fast in fields such as service field, sale of goods, logistics distribution, commerce, manufacturing enterprise and material circulations, progressively become a professional domain independently interdisciplinary, mainly comprise high frequency technique, semiconductor technology, electromagnetic compatibility technology, data security secrecy technology, telecommunications and manufacturing technology etc.Antenna directly affects the performance of system as the Primary Component of radio-frequency recognition system design.Antenna is a kind of device that front-end radiofrequency signal power is received or radiate with the electromagnetic wave form, is the interface device in circuit and space, is used for realizing the conversion of guided wave and free space wave energy.In rfid system, antenna is divided into electronic label antenna and reading and writing device antenna two big classes, bears the effect of received energy and emitted energy respectively.Current rfid system mainly concentrates on LF, HF (13.56MHz), UHF (860-960MHz) and microwave frequency band, and the principle of the rfid system antenna of different operating frequency range has fundamentally different with design.The gain of antenna and impedance operator can exert an influence to operating distance of rfid system etc., and the working frequency range of rfid system has certain requirement to antenna size and radiation loss conversely.So the RFID antenna performance directly influences the performance of whole rfid system.
For LF and HF frequency range, system works is in the near field of antenna, the required energy of label all is to obtain by the coupling coil radiation near field of inductance coupling high mode by read write line, working method is an inductance coupling high, and electric field strength is with the cube decay of distance, and magnetic field intensity is with the quadratic power decay of distance, and the electromagnetic field component phase difference is 90 degree, Poynting vector is an imaginary number, and energy only carries out the exchange of electric energy and magnetic energy not to external radiation near antenna surface.Because in fact do not relate to the problem of electromagnetic wave propagation in the near field, Antenna Design is fairly simple, general adopting process coil form antenna simple, with low cost.The coil form antenna is exactly in fact a resonant circuit.On the operating frequency of appointment, when induced impedance equaled condensance, coil antenna will produce resonance.The coil antenna resonant operational frequency of HF section RFID is generally 13.56MHz., and the RFID application system realizes two-way data communication by this frequency carrier.Some applied environment requires RFID coil antenna profile very little, and needs certain operating distance, and the mutual induction amount of coil antenna is reduced.In order to address this problem, our common portion in coil inserts the Ferrite Material with high permeability μ, to increase mutual induction amount, thereby the problem that the bucking coil cross section reduces. clearly, our transformer principle of knowing of the operation principle all fours of near field antenna, theory is relatively simple.
For hyperfrequency and microwave frequency band, reading and writing device antenna will provide energy or wake active label up for label, operating distance is far away, generally be positioned at the far field of reading and writing device antenna, electric field strength and magnetic field intensity are with the first power decay of distance, electric field is vertical mutually with magnetic direction, and all perpendicular to the direction of propagation.Poynting vector is a real number, and electromagnetic field is with the outside emittance of electromagnetic wave form.At this moment, Antenna Design is bigger to the systematic function influence, adopts dipole-type or micro-strip paster antenna more.
Dipole antenna is also referred to as doublet antenna, and being arranged in a line by two sections same thicknesses and isometric straight lead constitutes.Signal will produce certain CURRENT DISTRIBUTION from two end points feed-ins of centre on two arms of dipole, this CURRENT DISTRIBUTION will excite electromagnetic field at the antenna surrounding space.What generally use in the RFID electronic tag is the folded dipole antenna of meander configuration.When requiring dipole antenna that bigger input impedance is arranged, can adopt folded dipole antenna.
Micro-strip paster antenna mostly is print structure, has characteristics such as light weight, volume are little, thin profile, is convenient to integrated with other printed circuit.Microband paste can adopt the photoetching process manufacturing, and cost is low, be easy to a large amount of productions.Usually the radiation conductor of micro-strip paster antenna and metal floor distance is 1/tens wavelength, supposes that radiated electric field does not change along horizontal and vertical both direction of conductor, and only the edge is about the conductor length direction variation of half wavelength.Then the radiation of micro-strip paster antenna is that fringing field by patch conductor open circuit edge causes the radiation direction basic fixed.Therefore, micro-strip paster antenna is highly suitable in the little RFID application system of direction of communication variation.
Use for RFID closely, the general and read write line of antenna integrates, and for the far Distance RFID system, reading and writing device antenna and read write line are generally taked separate type, by the coaxial cable connection of impedance matching.In general, reading and writing device antenna requires characteristics such as low section, miniaturization and multiband covering.
Summary of the invention
Technical problem: the objective of the invention is to the shortcoming big at conventional radio-frequency card reader antenna volume, that manufacture craft is complicated, the plate-shaped feeding air-dielectric patch antenna that a kind of novelty simple in structure, working band are wide, be convenient to make realization is proposed, for the radio-frequency recognition system of 900MHz frequency range provides technological reserve.The technology that it has simple structure, is convenient to realize has smaller volume, can obtain the bandwidth of broad effectively.
Technical scheme: plate-shaped feeding air-dielectric patch antenna of the present invention, constitute by rectangular metal paster radiating element, metallic support rod, metal ground plate, plate-shaped feeding sheet, adopt coaxial feeding, it is characterized in that: the center of rectangular metal paster radiating element and an end of metallic support rod link together, and the other end of metallic support rod is fixed on the metal ground plate; The upper end of plate-shaped feeding sheet is connected the downside of rectangular metal paster radiating element; The lower end of plate-shaped feeding sheet and the inner wire of coaxial fitting link together; The outer conductor of coaxial fitting then is installed on the metal ground plate.
It is stepped that the plate-shaped feeding sheet connects to form the right angle by 3 planes, and the bottom surface of first plane and rectangular metal paster radiating element is perpendicular, and second plane and first plane are perpendicular, and the 3rd plane and second plane are perpendicular.
Beneficial effect: adopt the working band of the metallic plate of certain curved shape, adopt metallic support rectangular patch unit simultaneously, guarantee that antenna has both good electric and mechanical performance as feeder equipment, broadening antenna.Advantage of the present invention: simple in structure, manufacture craft is easy, and is with low cost.
Description of drawings
Fig. 1 is the perspective view of plate-shaped feeding air-dielectric patch antenna.
Fig. 2 is the cross-sectional view of plate-shaped feeding air-dielectric patch antenna.
Fig. 3 is the structural representation of the plate-shaped feeding sheet of plate-shaped feeding air-dielectric patch antenna.
Fig. 4 has provided the reflection coefficient characteristic of plate-shaped feeding air-dielectric patch antenna.
Fig. 5 has provided the antenna pattern of plate-shaped feeding air-dielectric patch antenna.
Plate-shaped feeding air-dielectric patch antenna among Fig. 1-3, wherein have: rectangular metal paster radiating element 1, metallic support rod 2, metal ground plate 3, plate-shaped feeding sheet 4, the inner wire 5 of first plane 41, second plane 42, the 3rd plane 43, coaxial fitting, the outer conductor 6 of coaxial fitting, alphabetical A-L mark the relative dimensions parameter of antenna each several part successively.
Embodiment
Contrast accompanying drawing 1-3, the characteristics of this antenna structure comprise:
1. the rectangular metal paster radiating element 1 of plate-shaped feeding air-dielectric patch antenna, its center adopt metallic support rod 2 to be connected on the metal ground plate 3, and the radius of metallic support rod is G;
2. the length of side of rectangular metal paster radiating element 1 is respectively B and C, and metal ground plate 3 is the square of length of side A;
3. plate-shaped feeding sheet 4 is formed according to the solid angle K in the accompanying drawing 3, J are folding by a block of metal plate, and other dimensional parameters comprises E, F, I, L, M;
4. an end of plate-shaped feeding sheet 4 directly is connected on the rectangular metal paster radiating element 1, and this connection feed base (length is L) is H to the distance at rectangular metal paster radiating element 1 center;
5. the other end of plate-shaped feeding sheet 4 (length is M) directly links to each other with the inner wire 5 of coaxial fitting, and the outer conductor 6 of coaxial fitting is installed on the metal ground plate 3.
Plate-shaped feeding air-dielectric patch antenna has that volume is little, working band is wide, characteristics such as directed radiation, and realization is simple, low processing cost, therefore be expected to apply in 900MHz frequency range radio-frequency recognition system, use, thereby have boundless application prospect as card reader antenna.
Claims (2)
1. plate-shaped feeding air-dielectric patch antenna, constitute by rectangular metal paster radiating element (1), metallic support rod (2), metal ground plate (3), plate-shaped feeding sheet (4), adopt coaxial feeding, it is characterized in that: an end of the center of rectangular metal paster radiating element (1) and metallic support rod (2) links together, and the other end of metallic support rod (2) is fixed on the metal ground plate (3); The upper end of plate-shaped feeding sheet (4) is connected the downside of rectangular metal paster radiating element (1); The inner wire (5) of the lower end of plate-shaped feeding sheet (4) and coaxial fitting links together; The outer conductor of coaxial fitting (6) then is installed on the metal ground plate (3).
2. plate-shaped feeding air-dielectric patch antenna according to claim 1, it is stepped to it is characterized in that plate-shaped feeding sheet (4) connects to form the right angle by 3 planes, first plane (41) is perpendicular with the bottom surface of rectangular metal paster radiating element (1), second plane (42) is perpendicular with first plane (41), and the 3rd plane (43) is perpendicular with second plane (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910030782A CN101527391A (en) | 2009-04-15 | 2009-04-15 | Plate-shaped feeding air-dielectric patch antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910030782A CN101527391A (en) | 2009-04-15 | 2009-04-15 | Plate-shaped feeding air-dielectric patch antenna |
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| CN101527391A true CN101527391A (en) | 2009-09-09 |
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| CN200910030782A Pending CN101527391A (en) | 2009-04-15 | 2009-04-15 | Plate-shaped feeding air-dielectric patch antenna |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102110871A (en) * | 2011-03-10 | 2011-06-29 | 江苏拓元科技发展有限公司 | Radio frequency identification tag antenna suitable for metal surface |
| CN102881984A (en) * | 2012-09-24 | 2013-01-16 | 南京邮电大学 | Directional antenna with slide tuning unit |
| CN102906938A (en) * | 2010-04-06 | 2013-01-30 | 拉迪娜股份有限公司 | Antenna having a broadband power supply structural body, and a power supply method |
| CN106252833A (en) * | 2016-07-29 | 2016-12-21 | 西安电子科技大学 | A kind of low section broadband UHF RFID antenna |
| CN111162373A (en) * | 2019-12-13 | 2020-05-15 | 山东冠通智能科技有限公司 | RFID circular polarization air microstrip antenna |
| CN114865289A (en) * | 2022-06-01 | 2022-08-05 | 成都益为创达科技有限公司 | Low-profile magnetic dipole antenna applicable to base station antenna |
-
2009
- 2009-04-15 CN CN200910030782A patent/CN101527391A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102906938A (en) * | 2010-04-06 | 2013-01-30 | 拉迪娜股份有限公司 | Antenna having a broadband power supply structural body, and a power supply method |
| CN102906938B (en) * | 2010-04-06 | 2016-03-23 | 拉迪娜股份有限公司 | There is antenna and the feed-in method of broadband feed-in structure body |
| CN102110871A (en) * | 2011-03-10 | 2011-06-29 | 江苏拓元科技发展有限公司 | Radio frequency identification tag antenna suitable for metal surface |
| CN102881984A (en) * | 2012-09-24 | 2013-01-16 | 南京邮电大学 | Directional antenna with slide tuning unit |
| CN106252833A (en) * | 2016-07-29 | 2016-12-21 | 西安电子科技大学 | A kind of low section broadband UHF RFID antenna |
| CN106252833B (en) * | 2016-07-29 | 2019-03-15 | 西安电子科技大学 | A kind of low section broadband UHF RFID antenna |
| CN111162373A (en) * | 2019-12-13 | 2020-05-15 | 山东冠通智能科技有限公司 | RFID circular polarization air microstrip antenna |
| CN114865289A (en) * | 2022-06-01 | 2022-08-05 | 成都益为创达科技有限公司 | Low-profile magnetic dipole antenna applicable to base station antenna |
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Application publication date: 20090909 |