CN205488479U - Double frequency -band circular polarization radio frequency identification reads ware antenna - Google Patents
Double frequency -band circular polarization radio frequency identification reads ware antenna Download PDFInfo
- Publication number
- CN205488479U CN205488479U CN201620078320.3U CN201620078320U CN205488479U CN 205488479 U CN205488479 U CN 205488479U CN 201620078320 U CN201620078320 U CN 201620078320U CN 205488479 U CN205488479 U CN 205488479U
- Authority
- CN
- China
- Prior art keywords
- port
- circular polarization
- frequency identification
- dual
- branch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Waveguide Aerials (AREA)
Abstract
The utility model discloses a double frequency -band circular polarization radio frequency identification reads ware antenna for the radio frequency identification system, including two -layer medium base plate, branch line coupler, floor and radiating element, two -layer medium base plate includes upper and lower layer medium base plate, the branch line coupler is printed in the lower surface of lower floor's medium base plate, the floor is printed in the upper surface of lower floor's medium base plate, radiating element prints in the upper surface of upper medium base plate, radiating element specifically is square, the central department on four square limits has all opened the rectangular channel, and the diagonal in square is opened has two circular recesss. The utility model discloses double frequency -band, broad area, circular polarization, miniaturized balanced optimization to minimum size obtains the biggest radiation bandwidth and circular polarization bandwidth.
Description
Technical field
This utility model relates to field of radio frequency identification, is specifically related to a kind of Dual-band circular polarization radio-frequency identification reader antenna.
Background technology
RF identification (Radio Frequency Identification, RFID) originates from the development of the Radar Technology forties in 20th century, is a kind of non-contacting automatic identification technology, also referred to as electronic label technology.It is automatically identified target by radiofrequency signal and is obtained target data, all processes unmanned.Many high-tech forward positions such as RFID technique relates to microelectronics, material, equipment and technique information, management multidisciplinary, many technology interleaving techniques group, covering radio communication, electromagnetic radiation, wireless receiving and dispatching, chip designs, and manufactures, assembling, Antenna Design, the technology such as data exchange, information security.Along with correlation technique develops, the application of RFID technique is increasingly extensive, some experts even predict that, it is likely to become another item after mobile communication technology, Internet technology affects the new technique of global economy and people's life.The particularly application of China's China second-generation identity card based on RFID technique so that Chinese people deeper a layer to the understanding of RFID.RFID is considered as one of 21 century the most rising technology.
RF identification (RFID) technology is a very important part in Internet of Things.The antenna being applied to rfid system read write line is one of its most important equipment, has had become as study hotspot at present.On the one hand, the RFID antenna of far field application generally uses circular polarized antenna or the aerial array of high-gain, to increase its reading distance.The rfid interrogator antenna near field then needs the characteristic of high-intensity magnetic field, broadband and low gain, and the magnetic field simultaneously produced should be uniformly distributed to avoid producing skip phenomenon.On the other hand, the read write line input/output signal in rfid system needs preferable transceiver insulation, and this isolation becomes one of key factor affecting system sensitivity.So that system obtains the label signal ability that preferably reads, need to reduce as far as possible the power of transmitter signal in receiver.
Utility model content
In order to overcome shortcoming that prior art exists with not enough, this utility model provides a kind of Dual-band circular polarization radio-frequency identification reader antenna.
This utility model adopts the following technical scheme that
A kind of Dual-band circular polarization radio-frequency identification reader antenna, including two layer medium substrate, branch-line coupler, floor and radiating element, described two layer medium substrate includes upper and lower layer medium substrate, described branch-line coupler is printed on the lower surface of layer dielectric substrate, described floor is printed on the upper surface of layer dielectric substrate, described radiating element is printed on the upper surface of upper layer medium substrate, described radiating element is the most square, the center on described four square limits all has rectangular channel, and the diagonal in square has two circular troughs.
The radius of said two circular trough is different.
Described branch-line coupler is specially square, and described foursquare across flats is equal, and adjacent side width is unequal, and described foursquare four summits are drawn four branch lines respectively and constituted four line caps.
Described branch-line coupler is counterclockwise, and 90-degree rotation is placed, the line cap that bottom summit is drawn is the first port, being followed successively by the second port, the 3rd port and the 4th port according to direction counterclockwise, first and second port described is respectively as launching signal feed port and receiving signal feed port.
Described floor includes that two H-shaped grooves, said two H-shaped groove lay respectively at the second port and the upper surface of the 3rd port just layer dielectric substrate of correspondence.
The medial lateral line of said two H-shaped groove is vertical with the branch line of the branch line of the second port being positioned at layer dielectric base lower surface and the 3rd port respectively.
The protruding rectangle of foursquare length of side midpoint between the first port and the 4th port, described rectangular aspect is 4mm*10mm.
The material of described upper and lower layer medium substrate is identical, and the vertical dimension between upper and lower layer medium substrate is 20mm.
The beneficial effects of the utility model:
(1) radiating surface at former linear polarized antenna drives asymmetric circular trough, it is achieved circular polarisation；
(2) radiating surface in former single-band antenna opens rectangular channel, increases frequency, it is achieved Dual-band circular polarization；
(3) two-layered medium substrate is used so that separate with being referenced between branch-line coupler with radiant panel, to keep good circular polarisation purity；
(4) open mutually orthogonal two H-type groove with reference to floor, couple generation circular polarization radiation with branch-line coupler；
(5) branch-line coupler improves antenna transmitting, the isolation of receiving port so that antenna can be effectively operating in full duplex state.
Accompanying drawing explanation
Fig. 1 is the structural representation of this utility model a kind of Dual-band circular polarization radio-frequency identification reader antenna；
Fig. 2 is the structural representation of the branch-line coupler being printed on layer dielectric base lower surface in Fig. 1；
Fig. 3 is the floor panel structure schematic diagram being printed on layer dielectric upper surface of base plate in Fig. 1；
Fig. 4 is the radiating element being printed on upper layer medium substrate upper surface in Fig. 1；
Fig. 5 is this utility model embodiment reflection coefficient S11 near 900MHz and near 2.45GHz；
Fig. 6 is this utility model embodiment AR near 900MHz and near 2.45GHz.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, this utility model is described in further detail, but embodiment of the present utility model is not limited to this.
Embodiment
As Figure 1-Figure 4, a kind of Dual-band circular polarization radio-frequency identification reader antenna, for RF identification (RFID) system, including two layer medium substrate, branch-line coupler, floor and radiating element, described two layer medium substrate includes, layer dielectric substrate 2, 1, described branch-line coupler is printed on the lower surface of layer dielectric substrate, described floor is printed on the upper surface of layer dielectric substrate, described radiating element is printed on the upper surface of upper layer medium substrate, described radiating element 9 is the most square, the center on described four square limits all has rectangular channel, described rectangular channel is all to square internal projection, diagonal in square has two circular troughs, said two circular trough radius is different, in the present embodiment, the centre point of two circular troughs is respectively positioned on diagonal.
Described upper and lower layer medium substrate material uses FR4, and dielectric constant is 4.4, and loss angle tangent is 0.02, and thickness is 1.6mm.Two-layer substrate material is consistent, and interval vertical distance is placed for 20mm, and the center of upper and lower layer medium substrate is on the vertical straight line of same.The size of layer dielectric version is 200mm*200mm, and the size of top dielectric plate is 152mm*152mm.The reason using two layer medium plate is to separate with being referenced between branch-line coupler with radiant panel, to keep good circular polarisation purity.
As shown in Figure 2, described branch-line coupler is printed on the lower surface of layer dielectric substrate, the basic configuration of branch-line coupler is square, the length of side is 48mm, foursquare across flats is equal, adjacent side width is unequal, and described foursquare four summits are drawn four branch lines 6 respectively and constituted four line caps.Described branch-line coupler is counterclockwise, and 90-degree rotation is placed, the line cap that bottom summit is drawn is the first port port1, being followed successively by the second port port2, the 3rd port port3 and the 4th port port4 according to direction counterclockwise, first and second port described is respectively as launching signal feed port and receiving signal feed port.
The length of side 4 between second port port2 and the 3rd port port3 is equal with the length of side 5 width between its opposite side that is first port port1 and the 4th port port4, and its width is 2.6mm.
The length of side 3 between first port port1 and the second port port2 is equal with the width of its opposite side, and its width is 5mm, the length of side in order to increase isolation, between the first port port1 and the 4th port port4
The protruding rectangle of midpoint, its long a width of 4mm*10mm.The length and width that four branch lines 6 are drawn on described foursquare four summits respectively is respectively 36.7mm and 3mm.
Wherein, two line cap port1 and port4 at medium substrate edge it are positioned at respectively as launching signal feed port and receiving signal feed port.Surface current is divided into two branch roads from port1, and the energy entering port1 distributes to port2 and port3 with phase quadrature equably, and the electric current near port 4 is greatly attenuated by carrier offset simultaneously, it is achieved good isolation.
Described floor includes two H-shaped grooves, said two H-shaped groove lays respectively at the upper surface of layer dielectric substrate just corresponding for the second port port2 and the 3rd port port3, described H-shaped groove is by two vertical lines 7 and between two vertical lines and the horizontal line 8 vertical with two vertical lines is constituted, two articles of horizontal lines of described H-shaped groove are vertical with the branch line of the 3rd port and the second port respectively, the a length of 41mm of described vertical line, width is 1mm；The a length of 41.4mm of horizontal line 8, width is 0.5mm.Second port port2 and the 3rd port port3 H type slot-coupled orthogonal with on floor two, produces circular polarization radiation.
Described radiating element 9 is printed on the upper surface of upper layer medium substrate, and described radiating element is the most square, and the center on described four square limits all has rectangular channel 10, and the diagonal in square has two circular troughs 11,12.
Described square size is 120mm*120mm, and the size of rectangular channel is 4mm*4mm, to increase 2.45GHz resonance frequency, meanwhile, square diagonal is opened asymmetric circular trough, form perturbation, realizing circular polarisation, the radius of said two circular trough is different, and radius is respectively 8mm and 4mm.
The Dual-band circular polarization radio-frequency identification reader antenna simulation result that dimensions indicated above makes is as shown in Figure 5 and Figure 6, wherein, Fig. 5 is the reflection coefficient S11 curve chart near 900MHz and near 2.45GHz, for investigating 10dB bandwidth, can be seen that, 10dB near 900MHz carries a width of 720-940MHz, covers European standard (865 869MHz) and Unite States Standard (902 928MHz)；10dB near 2.45GHz carries a width of 2.36GHz-2.75GHz, and bandwidth ratio reaches 15.9%.Fig. 6 be the axle near 900MHz than AR curve chart, be used for investigating 3dB circular polarisation bandwidth, it can be seen that in 10dB frequency band, the axle of antenna is than approximately less than 3dB, it is achieved that good circular polarisation.
This utility model uses branch-line coupler, optimizes the isolation of single antenna dual-port.Meanwhile, novel mode of grooving is applied to radiating surface, increases circular polarisation frequency band, optimizes circular polarisation bandwidth, it is achieved dual-frequency band and dual round polarization；It is applied to reference ground, realizes slot-coupled with port2 and port3 of branch-line coupler, produce circular polarization radiation.And novel fluting makes whole antenna obtain miniaturization.
This utility model double frequency-band, wider band, circular polarisation, miniaturization balance optimizing, obtain maximum radiation bandwidth and circular polarisation bandwidth with minimum size.
Above-described embodiment is this utility model preferably embodiment; but embodiment of the present utility model is also not restricted by the embodiments; other any without departing from the change made under spirit of the present utility model and principle, modify, substitute, combine, simplify; all should be the substitute mode of equivalence, within being included in protection domain of the present utility model.
Claims (8)
1. a Dual-band circular polarization radio-frequency identification reader antenna, it is characterized in that, including two layer medium substrate, branch-line coupler, floor and radiating element, described two layer medium substrate includes upper and lower layer medium substrate, described branch-line coupler is printed on the lower surface of layer dielectric substrate, described floor is printed on the upper surface of layer dielectric substrate, described radiating element is printed on the upper surface of upper layer medium substrate, described radiating element is the most square, the center on described four square limits all has rectangular channel, and the diagonal in square has two circular troughs.
A kind of Dual-band circular polarization radio-frequency identification reader antenna the most according to claim 1, it is characterised in that the radius of said two circular trough is different.
A kind of Dual-band circular polarization radio-frequency identification reader antenna the most according to claim 1, it is characterized in that, described branch-line coupler is specially square, described foursquare across flats is equal, adjacent side width is unequal, and described foursquare four summits are drawn four branch lines respectively and constituted four line caps.
A kind of Dual-band circular polarization radio-frequency identification reader antenna the most according to claim 3, it is characterized in that, described branch-line coupler is counterclockwise, and 90-degree rotation is placed, the line cap that bottom summit is drawn is the first port, being followed successively by the second port, the 3rd port and the 4th port according to direction counterclockwise, first and second port described is respectively as launching signal feed port and receiving signal feed port.
A kind of Dual-band circular polarization radio-frequency identification reader antenna the most according to claim 1, it is characterised in that described floor includes that two H-shaped grooves, said two H-shaped groove lay respectively at the second port and the upper surface of the 3rd port just layer dielectric substrate of correspondence.
A kind of Dual-band circular polarization radio-frequency identification reader antenna the most according to claim 5, it is characterised in that the medial lateral line of said two H-shaped groove is vertical with the branch line of the branch line of the second port being positioned at layer dielectric base lower surface and the 3rd port respectively.
A kind of Dual-band circular polarization radio-frequency identification reader antenna the most according to claim 3, it is characterised in that the protruding rectangle of the foursquare length of side midpoint between the first port and the 4th port, described rectangular aspect is 4mm*10mm.
A kind of Dual-band circular polarization radio-frequency identification reader antenna the most according to claim 1, it is characterised in that the material of described upper and lower layer medium substrate is identical, and the vertical dimension between upper and lower layer medium substrate is 20mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620078320.3U CN205488479U (en) | 2016-01-26 | 2016-01-26 | Double frequency -band circular polarization radio frequency identification reads ware antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620078320.3U CN205488479U (en) | 2016-01-26 | 2016-01-26 | Double frequency -band circular polarization radio frequency identification reads ware antenna |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205488479U true CN205488479U (en) | 2016-08-17 |
Family
ID=56619563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620078320.3U Expired - Fee Related CN205488479U (en) | 2016-01-26 | 2016-01-26 | Double frequency -band circular polarization radio frequency identification reads ware antenna |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205488479U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529519A (en) * | 2016-01-26 | 2016-04-27 | 华南理工大学 | Dual-frequency-band circularly polarized radio frequency identification reader antenna |
| US11239562B2 (en) | 2019-03-28 | 2022-02-01 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Antenna module and electronic device |
-
2016
- 2016-01-26 CN CN201620078320.3U patent/CN205488479U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105529519A (en) * | 2016-01-26 | 2016-04-27 | 华南理工大学 | Dual-frequency-band circularly polarized radio frequency identification reader antenna |
| US11239562B2 (en) | 2019-03-28 | 2022-02-01 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Antenna module and electronic device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103178336B (en) | Ultrathin double-frequency microstrip patch antenna configuration RFID label antenna | |
| US6184841B1 (en) | Antenna array in an RFID system | |
| US20170077614A1 (en) | Dual-frequency dual-polarized base station antenna for parallel dual feeding | |
| CN105529519A (en) | Dual-frequency-band circularly polarized radio frequency identification reader antenna | |
| CN205029009U (en) | Two wireless radio frequency identification antennas of circular polarization in broadband | |
| CN101299486A (en) | RFID reader-writer antenna capable of overlapping high-frequency and ultrahigh frequency as well as microwave frequency band | |
| CN105322289A (en) | Novel RFID circularly polarized antenna | |
| CN205488479U (en) | Double frequency -band circular polarization radio frequency identification reads ware antenna | |
| CN201191647Y (en) | RFID electronic label antenna having dual T type slot radiation element | |
| Huang et al. | Design of a Printed Dipole Array Antenna with Wideband Power Divider and RF Switches | |
| CN108521014B (en) | Miniaturized MIMO reader antenna and terminal applied to RFID | |
| CN203423258U (en) | RFID antenna | |
| CN101330170B (en) | Ultra short span quasi-eight-wood metal-resistant antenna and electronic label using the same | |
| CN103474764B (en) | RFID high-gain circular polarization microstrip antenna array | |
| CN112366446B (en) | Multi-slot coupling simultaneous same-frequency full-duplex antenna applied to UHF frequency band RFID | |
| CN106025526A (en) | Polarized sensitive array antenna | |
| CN206490172U (en) | Super high frequency radio frequency recognizes antenna | |
| CN101635393A (en) | Circularly polarized MIMO antenna system in RFID technical management field | |
| CN206541932U (en) | A kind of double frequency mimo antenna suitable for WLAN | |
| CN205282643U (en) | Radio -frequency identification antenna | |
| CN209344301U (en) | Ultrahigh frequency RFID anti-metal tag antenna | |
| CN107026320A (en) | A kind of non-homogeneous circular polarisation loop antenna of balanced type | |
| CN203456593U (en) | Double-frequency-band slot antenna based on half-mode substrate integrated waveguides | |
| CN202333115U (en) | Microstrip patch type radio frequency identification (RFID) label antenna | |
| CN201789071U (en) | Elongated circular polarized antenna structure |
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: 20160817 Termination date: 20190126 |