CN201194249Y - Circularly polarized ultra-high-frequency RFID reader antenna - Google Patents
Circularly polarized ultra-high-frequency RFID reader antenna Download PDFInfo
- Publication number
- CN201194249Y CN201194249Y CNU2008200574504U CN200820057450U CN201194249Y CN 201194249 Y CN201194249 Y CN 201194249Y CN U2008200574504 U CNU2008200574504 U CN U2008200574504U CN 200820057450 U CN200820057450 U CN 200820057450U CN 201194249 Y CN201194249 Y CN 201194249Y
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- antenna
- ground plate
- radiation fin
- circular polarization
- radio frequency
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Abstract
The utility model discloses a circular polarization ultrahigh radio frequency recognition reader aerial, with an air gap microstrip aerial structure, comprising a ground plate, a radiation fin and an impedance matching unit, wherein the radiation fin is a square ring, and the square ground plate s coincident with a symmetrical axis of the radiation fin. Lines of the impedance matching unit extend inwards from a diagonal of the radiation fin, then vertically bend down to the ground plate, form into feed lines of the ground plate. The feed lines vertically bend again at the part near the ground plate, form into signal line feed lines of the ground plate, which is connected with the signal lines of a coaxial cable. The ground plate and the coaxial cable of the aerial are connected. The current feeding system of the utility model is simple, area is reduced, meanwhile cost is low and efficiency is high.
Description
Technical field
The utility model relates to antenna, particularly a kind of circular polarization super high frequency radio frequency identification reader antenna.
Background technology
Radio-frequency recognition system (Radio Frequency Identification, hereinafter to be referred as RFID) be that a kind of radio wave that utilizes is read and write programmed recording medium, radio-frequency technique is combined with the IC-card technology and can be used for the technology of remote, moving-target, wireless identification.
Rfid system is in concrete application process, and according to different application purposes and applied environment, the composition of system can be different, but with regard to its operation principle, system generally all is made up of transponder, reader and PC.Transponder should be placed on the object that will discern, can send and receive information, and can do processing such as read/write according to the operational order of receiving; Reader is to gather transponder information and transponder is sent the device of operational order, and the order of sending comprises orders such as read/write, selection, cancellation selection.
Antenna is a critical component in radio communication and the radar system as the equipment of a kind of reception and launching electromagnetic wave, and it is the interface of free space and transmission line, is commonly referred to " electronic eyes " or " electronic ear ".The effect of antenna in various radiotechnics equipment is identical basically.Any radiotechnics equipment all transmits signal by electromagnetic wave, and it must have the energy radiation or receive electromagnetic device, and antenna is exactly this device, so the effect of antenna at first is exactly radiation and receives electromagnetic wave.Based on such prerequisite, since the generation of wireless communication technique, antenna just has been born thereupon.
From the simplest wire antenna, surface antenna, antenna technology has experienced innovation for several times.Along with the expansion in antenna applications field, being showing improvement or progress day by day of wireless communication technology, people are more and more higher to the requirement of antenna: operating distance is far away as much as possible, and it is big as much as possible to gain, and power consumption is as much as possible little, and efficient is high as much as possible, and polarization is coupling or the like as much as possible.Invented technology such as microstrip antenna and antenna array in recent years again, made antenna be applied in more field, intelligence communication field particularly is such as TD-SCDMA mobile phone.
Generally speaking electronic tag all is designed to the form of linear polarization, and it is put may be any direction, and this cooperates the read-write of label antenna with regard to the reading and writing device antenna that needs circular polarization.Circular polarization means that in the plane of antenna the read write line rotation does not influence the communication distance of system.
See also Fig. 1 and Fig. 2.Fig. 1 is the stereogram of the microstrip antenna of the utility model routine, and Fig. 2 is the end view of the microstrip antenna of the utility model routine.Conventional paster antenna is called microstrip antenna again, and the simplest microstrip antenna of structure is to be made of the radiation fin 10 that is attached on the dielectric substrate 12 that has metal ground plate 11.Radiation fin 10 is used for radiated electromagnetic wave, adopts copper and gold to make usually, desirable arbitrary shape.The length of side of the radiation fin of a rectangle approximates half-wavelength.The feeding classification of antenna generally has the limit feedback and the back of the body to present two kinds, the mode of limit feedback generally can increase the area of antenna, a lot of for this reason antennas adopt back of the body feedback mode as shown in Figure 2, are connected coaxial cable, the realization impedance matching by one with the vertical metal wire 23 of radiation fin 10.
The area of antenna can reduce along with the increase of the dielectric constant of dielectric layer, but the radiation efficiency of such microstrip antenna can reduce, and cost can increase.Antenna adopts the dielectric structure of air-gap more cheaply.The radiation efficiency of the microstrip antenna of air-gap is expensive low, but its volume is big.
The utility model content
The utility model is the deficiency that overcomes above-mentioned prior art, and the technical problems to be solved in the utility model provides a kind of circular polarization super high frequency radio frequency identification reader antenna.
For solving the problems of the technologies described above, the technical solution of the utility model is:
A kind of circular polarization super high frequency radio frequency identification reader antenna, this antenna is the air-gap microstrip antenna structure, comprises ground plate, radiation fin and impedance matching unit, this radiation fin and ground plate are parallel to each other, and connect by nylon screw.
Described radiation fin is Fang Huan, and the described square ground plate and the symmetry axis of radiation fin overlap.
The lines of described impedance matching unit extend in ring from a diagonal of described radiation fin, then vertically roll over down to described ground plate, form the feed lines that hang down as for this ground plate, these feed lines are vertically bending once more near described ground plate place, formation is parallel to the holding wire feed lines of described ground plate, these holding wire feed lines are connected with the holding wire of the coaxial cable of described antenna, and described ground plate links to each other with the ground wire of the coaxial cable of described antenna.
The impedance matching unit of described antenna is to become with a kind of metallic with the radiation fin of antenna.
The impedance matching unit of described antenna and the radiation fin of antenna are to be made by copper or aluminium.
The center line girth of described radiation fin is regulated in positive and negative 10% scope of antenna operation wavelength.
The center line girth of described radiation fin equals the wavelength of described antenna work.
Described ground plate is an aluminium sheet.
Compared with prior art, the beneficial effects of the utility model are:
The utility model is designed to Fang Huan with the radiation fin of the microstrip antenna of routine, and its girth approximates the wavelength of antenna work.Such radiation fin structure can reduce the area of radiation fin, under identical ground plate, is equal to the area that has increased ground plate, and then has increased the gain of antenna, has reduced the cost of material simultaneously.This novel feeding classification is made simple, and area reduces, and has realized low-cost, high efficiency simultaneously.
Description of drawings
Fig. 1 is the stereogram of the microstrip antenna of the utility model routine;
Fig. 2 is the end view of the microstrip antenna of the utility model routine;
Fig. 3 is the vertical view of the utility model reader antenna;
Fig. 4 is the stereogram of the utility model reader antenna.
Embodiment
Below in conjunction with drawings and Examples embodiment of the present utility model is further described in detail, but should limit protection range of the present utility model with this.
See also Fig. 3 and Fig. 4.Fig. 3 is the vertical view of the utility model reader antenna; Fig. 4 be the utility model reader antenna stereogram.This novel circular polarization super high frequency radio frequency identification reader antenna, this antenna is the air-gap microstrip antenna structure, comprises ground plate 30, radiation fin 31 and impedance matching unit 32.Ground plate 30 is aluminium sheets, and radiation fin 31 and impedance matching Unit 32 are copper coins.
The lines of described impedance matching unit 32 extend in ring from a diagonal of described radiation fin 31, then to described ground plate 30 vertical foldings down, form the feed lines 33 that hang down as for this ground plate 30, these feed lines 33 are vertically bending 1 millimeter-5 mm distance once more near described ground plate 30, formation is parallel to the holding wire feed lines 34 of described ground plate 30, these holding wire feed lines 34 are connected with the holding wire of the coaxial cable of described antenna, and described ground plate 30 links to each other with the ground wire of the coaxial cable of described antenna.
The impedance matching unit 32 of described antenna is to become with a kind of metallic with the radiation fin 31 of antenna, adopts copper or gold usually.
The utility model circular polarization super high frequency radio frequency identification reader antenna has reduced antenna volume, has realized low-cost, high efficiency simultaneously.
The above is preferred embodiment of the present utility model only, is not to be used for limiting practical range of the present utility model.Be that all equivalences of doing according to the content of the utility model claim change and modification, all should be technology category of the present utility model.
Claims (9)
1. a circular polarization super high frequency radio frequency is discerned reader antenna, this antenna is the air-gap microstrip antenna structure, comprises ground plate (30), radiation fin (31) and impedance matching unit (32), and this radiation fin (31) and ground plate (30) are parallel to each other, connect by nylon screw, it is characterized in that:
Described radiation fin (31) is Fang Huan, and the described square ground plate (30) and the symmetry axis of radiation fin (31) overlap,
The lines of described impedance matching unit (32) extend in ring from a diagonal of described radiation fin (31), then vertically roll over down to described ground plate (30), form the feed lines (33) that hang down as for this ground plate (30), these feed lines (33) are being located vertically to bend once more near described ground plate (30), formation is parallel to the holding wire feed lines (34) of described ground plate (30), these holding wire feed lines (34) are connected with the holding wire of the coaxial cable of described antenna, and described ground plate (30) links to each other with the ground wire of the coaxial cable of described antenna.
2. circular polarization super high frequency radio frequency identification reader antenna according to claim 1, it is characterized in that: the impedance matching unit of described antenna (32) is to become with a kind of metallic with the radiation fin (31) of antenna.
3. circular polarization super high frequency radio frequency identification reader antenna according to claim 1 and 2, it is characterized in that: the impedance matching unit of described antenna (32) is to be made by copper or aluminium with the radiation fin (31) of antenna.
4. circular polarization super high frequency radio frequency according to claim 1 identification reader antenna is characterized in that: the center line girth of described radiation fin (31) is regulated in positive and negative 10% scope of antenna operation wavelength.
5. circular polarization super high frequency radio frequency according to claim 3 identification reader antenna is characterized in that: the center line girth of described radiation fin (31) is regulated in positive and negative 10% scope of antenna operation wavelength.
6. according to claim 1 or 2 or 4 described circular polarization super high frequency radio frequency identification reader antennas, it is characterized in that: the center line girth of described radiation fin (31) equals the wavelength of described antenna work.
7. circular polarization super high frequency radio frequency identification reader antenna according to claim 1 and 2, it is characterized in that: described ground plate (30) is an aluminium sheet.
8. circular polarization super high frequency radio frequency identification reader antenna according to claim 3, it is characterized in that: described ground plate (30) is an aluminium sheet.
9. circular polarization super high frequency radio frequency identification reader antenna according to claim 4, it is characterized in that: described ground plate (30) is an aluminium sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200574504U CN201194249Y (en) | 2008-04-18 | 2008-04-18 | Circularly polarized ultra-high-frequency RFID reader antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200574504U CN201194249Y (en) | 2008-04-18 | 2008-04-18 | Circularly polarized ultra-high-frequency RFID reader antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201194249Y true CN201194249Y (en) | 2009-02-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200574504U Expired - Fee Related CN201194249Y (en) | 2008-04-18 | 2008-04-18 | Circularly polarized ultra-high-frequency RFID reader antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201194249Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807748A (en) * | 2010-04-13 | 2010-08-18 | 湖南大学 | Broadband circularly polarization microstrip patch antenna |
| CN110247172A (en) * | 2019-06-30 | 2019-09-17 | 瑞声光电科技（苏州）有限公司 | Antenna oscillator and array antenna |
-
2008
- 2008-04-18 CN CNU2008200574504U patent/CN201194249Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101807748A (en) * | 2010-04-13 | 2010-08-18 | 湖南大学 | Broadband circularly polarization microstrip patch antenna |
| CN101807748B (en) * | 2010-04-13 | 2012-10-31 | 湖南大学 | Broadband circularly polarization microstrip patch antenna |
| CN110247172A (en) * | 2019-06-30 | 2019-09-17 | 瑞声光电科技（苏州）有限公司 | Antenna oscillator and array antenna |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090211 Termination date: 20170418 |