CN201966314U - Dual-band RF antenna and wireless RFID device - Google Patents
Dual-band RF antenna and wireless RFID device Download PDFInfo
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- CN201966314U CN201966314U CN2010206408948U CN201020640894U CN201966314U CN 201966314 U CN201966314 U CN 201966314U CN 2010206408948 U CN2010206408948 U CN 2010206408948U CN 201020640894 U CN201020640894 U CN 201020640894U CN 201966314 U CN201966314 U CN 201966314U
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Abstract
The utility model relates to a dual-band RF (Radio Frequency) antenna, in particular to high-isolation design of two antennas in different frequency bands, which achieves perfect compatibility and avoids mutual influence. The RF antenna comprises a closed-loop antenna in the HF (High Frequency) band and a planar spiral antenna in the UHF (Ultra High Frequency) band, wherein the plane spiral antenna consists of two opposite subsidiary spiral antennas rotating in the same direction. Owing to the linear spiral characteristic of the spiral antenna, a spiral clearance existing in the antenna surface does not influence the electromagnetic induction working mode of the HF antenna, so that the closed-loop antenna and the planar spiral antenna can work together. The utility model solves the problem of electromagnetic compatibility of the UHF RF antenna, ensures the ticket reading evenness and avoids fault reading, thereby ensuring the ticket checking security. The utility model further provides an RFID (Radio Frequency Identification) device.
Description
Technical field
The utility model relates to the radio frequency identification applied technical field, particularly a kind of radio frequency bill the swipe the card dual-mode antenna and radio frequency identification device in field of being used for.
Background technology
Radio-frequency (RF) identification is a kind of contactless automatic identification technology.In RFID (Radio FrequencyIdentification, radio-frequency (RF) identification) system, identifying information leaves in the electric data carrier, and electric data carrier becomes transponder.The identifying information of depositing in the transponder is read by reader, and in some applications, reader not only can be read the information of depositing, and can write data to transponder, and the bipartite radio communication of passing through of read-write realizes.
RFID is divided into low frequency (LF), high frequency (HF), hyperfrequency (UHF), microwave (MW) by the difference of applying frequency, corresponding representative frequency is respectively: low frequency 135KHz is following, high frequency 13.56MHz, hyperfrequency 860M-960MHz, microwave 2.4G, 5.8G.
According to the difference of RF-coupled mode, RFID can be divided into inductance coupling high mode (magnetic coupling) and backscattering coupled modes (electromagnetic field couples) two big classes.
Wherein, the carrier frequency f of inductance coupling high mode
c(being also referred to as operating frequency) is for 13.56MHz with less than the frequency range of 135kHz.The transponder of inductance coupling high mode nearly all is passive, and energy obtains from reader.Because the magnetic field intensity that reader produces is subjected to the strictness restriction of Electro Magnetic Compatibility related standards, so the operating distance between reader and the transponder is very near, generally below one meter.
Superfrequency (UHF) and hyperfrequency (SHF) adopt RFID backscattering coupled modes.When electromagnetic wave ran into extraterrestrial target (transponder), its energy part was absorbed by target, and another part is dispersed into all directions with different intensity.In the energy of scattering, a part has been scattered back transmitting antenna (transmitting antenna also is a reception antenna thus), and is received by this antenna and to amplify to received signal and handle, and can obtain target for information about.
Respond to this magnetic field owing to the HF label utilizes inductance coupling high for received energy, wavelength is longer, belongs to the inductive type antenna, therefore needs more conductive material to realize.And the UHF label can obtain identical near-field energy equally at an easy rate, and efficient and cost benefit are higher.Therefore, UHF is can be than HF easier and be used for the near field more efficiently, this means that the UHF system can be included in the high environment of liquid and tenor than reading the more information that HF can read at complex environment more.
Along with the development of technology, the UHF technical advantage is more and more obvious, and its overall application is also irresistible.The common use of HF and UHF also becomes the demand in epoch.Therefore the bimodulus application system of developing HF and UHF is necessary.
The utility model content
Technical problem to be solved in the utility model provides a kind of bimodulus radio-frequency antenna, eliminate the mutual interference mutually of two band antennas of HF and UHF, realize the use of dual-mode antenna co-operation, and realize that induction range comprehensively, evenly, the purpose that distance is moderate, the phenomenon of effectively stopping bill mistake brush and leaking brush guarantees the fail safe of ticket checking.
The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of bimodulus radio-frequency antenna comprises substrate, is arranged at the flat helical antenna of the uhf band on the described substrate and around the HF band antenna of described uhf band antenna; Wherein, described flat helical antenna is made up of two sub-helical antennas of placing with the rotation direction opposition.
The beneficial effects of the utility model are: because the linear spinning behaviour of helical antenna, make screw type slit to occur in the antenna surface, do not influence the electromagnetic induction mode of operation of HF antenna, realize that uhf band and HF band antenna work simultaneously.
On the basis of technique scheme, the utility model can also be done following improvement.
Further, the spiral arm current feed phase of the sub-helical antenna of the flat helical antenna of described uhf band differs 180 °.
The beneficial effect that adopts above-mentioned further scheme is to realize non-frequency dependent characteristic, even peripheral HF aerial coil or complicated peripheral environment impact inner UHF antenna, because the broadband properties of antenna also can keep good resonance characteristic at the working frequency points place.
Further, between two of described flat helical antenna spirals the slit is arranged with the placement of rotation direction opposition.
The utility model also provides a kind of radio frequency identification device, comprises radio frequency signal processing circuit, the aforesaid bimodulus radio-frequency antenna that is connected with radio frequency signal processing circuit.
Further, described radio frequency signal processing circuit comprises the HF read circuit that is connected and is used to read the HF frequency band signals with the HF band antenna, and the UHF read circuit that is connected and is used to read the uhf band signal with the uhf band antenna.
Description of drawings
Fig. 1 is the utility model bimodulus radio-frequency antenna structural representation;
Fig. 2 is the fundamental diagram of HF band antenna among the utility model embodiment;
Fig. 3 is the fundamental diagram of uhf band antenna among the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing principle of the present utility model and feature are described, institute gives an actual example and only is used to explain the utility model, is not to be used to limit scope of the present utility model.
As shown in Figure 1, a kind of bimodulus radio-frequency antenna comprises the flat helical antenna 16 of a closed loop HF band antenna 11 and a uhf band.The spiral slit of described inner UHF flat helical antenna 16, give the sufficient diffraction of the magnetic line of force space of 13.56MHz antenna, under the prerequisite that does not influence HF band antenna 11 inductance coupling high modes, realized the backscattering coupling of oneself, reach both and work simultaneously, the purpose that is independent of each other.Described flat helical antenna 16 is made up of two sub-helical antennas of placing with rotation direction opposition 14 and 15, and two sub-helical antennas 14 and 15 have the slit, and the spiral arm current feed phase differs 180 °.Because the linear spinning behaviour of helical antenna makes and has promptly expanded effective radiating area in the screw type slit of the interior appearance of antenna surface, does not influence the electromagnetic induction mode of operation of HF antenna again.This utility model has been avoided interfering with each other between the antenna, can realize more comprehensive, the induction range of swiping the card uniformly.
In the utility model, described radio-frequency antenna 11 is operated in high frequency HF frequency range, and radio-frequency antenna array 12 is operated in the superfrequency uhf band.
The schematic diagram of antenna described in the utility model 11 in the ticket checking process seen Fig. 2, the 21st, and reader, the 22nd, the bill transponder is comprising HF coil antenna and reply chip.The 23rd, the peripheral HF closed loop antenna 11 in the utility model.Because the wavelength of HF frequency is longer, be about 22.1m, compare distance between reader and the transponder and want big many, the magnetic line of force that antenna 23 (being equivalent to the antenna 11 in the utility model accompanying drawing 1) is produced passes the bill antenna, produces induced voltage and come transmission information on discounted note.Therefore, the principle of induction of HF can be described as the transmission of inductance coupling high mode realization information.
The fundamental diagram of antenna described in the utility model 12 is seen Fig. 3, bill chip energy is provided by reader, reader antenna 31 (being equivalent to the antenna 12 in the utility model) emitted power P1 arrives bill antenna 32 after space attenuation, a power part that arrives is absorbed by the bill transponder, a part is reflected, and the part that is reflected is received by reader antenna 31.Therefore the UHF aerial array is the transmission that realizes information by the mode of backscattering coupling.
In embodiment of the present utility model, two prevention at radio-frequency port are powered simultaneously, and two different band antennas will be worked simultaneously.Appear at any place of antenna top when the ticket of 13.56MHz, because the spiral slit of antenna 12, make the line of magnetic induction of HF frequency range may reside in the helical antenna top, therefore, the bill of HF frequency range reads the influence that can not be subjected to antenna 12, all has the coupling magnetic line of force in whole zone, and bill is easy to sensed, as shown in Figure 2, and information is passed to reader carry out reprocessing.When the bill of 915MHz appears at any place of antenna top, because helical antenna has bigger swept area, even external coil is to its frequency shift (FS) that causes, the characteristic that its non-frequency becomes also can guarantee system the working frequency points place resonance condition is preferably arranged, realize reading of uhf band bill.
The above only is preferred embodiment of the present utility model, and is in order to restriction the utility model, not all within spirit of the present utility model and principle, any modification of being done, is equal to replacement, improvement etc., all should be included within the protection range of the present utility model.
Claims (5)
1. a bimodulus radio-frequency antenna is characterized in that, comprises substrate, is arranged at the flat helical antenna of the uhf band on the described substrate and around the closed loop HF band antenna of described uhf band antenna; Wherein, described flat helical antenna is made up of two sub-helical antennas of placing with the rotation direction opposition.
2. radio-frequency antenna according to claim 1 is characterized in that, the spiral arm current feed phase of two sub-helical antennas of the flat helical antenna of described uhf band differs 180 °.
3. radio-frequency antenna according to claim 1 is characterized in that, between two sub-helical antennas with the placement of rotation direction opposition of described flat helical antenna the slit is arranged.
4. a radio frequency identification device comprises radio frequency signal processing circuit, it is characterized in that, also include be connected with described radio frequency signal processing circuit as the arbitrary described bimodulus radio-frequency antenna of claim 1 to 3.
5. radio frequency identification device according to claim 4, it is characterized in that, described radio frequency signal processing circuit comprises the HF read circuit that is connected and is used to read the HF frequency band signals with the HF band antenna, and the UHF read circuit that is connected and is used to read the uhf band signal with the uhf band antenna.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206408948U CN201966314U (en) | 2010-12-03 | 2010-12-03 | Dual-band RF antenna and wireless RFID device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010206408948U CN201966314U (en) | 2010-12-03 | 2010-12-03 | Dual-band RF antenna and wireless RFID device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201966314U true CN201966314U (en) | 2011-09-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010206408948U Expired - Lifetime CN201966314U (en) | 2010-12-03 | 2010-12-03 | Dual-band RF antenna and wireless RFID device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201966314U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103000990A (en) * | 2012-12-05 | 2013-03-27 | 常州市科晶电子有限公司 | Anti-theft detection device for electronic tags |
| CN103646272A (en) * | 2013-12-03 | 2014-03-19 | 北京中电华大电子设计有限责任公司 | Miniature electronic tag |
| GB2550103A (en) * | 2016-03-10 | 2017-11-15 | Paxton Access Ltd | Dual frequency RFID reader |
| CN108511874A (en) * | 2018-03-13 | 2018-09-07 | 苏州德索文信息科技有限公司 | A kind of liquid RFID antenna and preparation method thereof |
| CN113036409A (en) * | 2021-01-27 | 2021-06-25 | 西安电子科技大学 | Low-profile planar helical antenna adopting novel feed mode |
-
2010
- 2010-12-03 CN CN2010206408948U patent/CN201966314U/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103000990A (en) * | 2012-12-05 | 2013-03-27 | 常州市科晶电子有限公司 | Anti-theft detection device for electronic tags |
| CN103000990B (en) * | 2012-12-05 | 2015-02-25 | 常州市科晶电子有限公司 | Anti-theft detection device for electronic tags |
| CN103646272A (en) * | 2013-12-03 | 2014-03-19 | 北京中电华大电子设计有限责任公司 | Miniature electronic tag |
| GB2550103A (en) * | 2016-03-10 | 2017-11-15 | Paxton Access Ltd | Dual frequency RFID reader |
| US10637143B2 (en) | 2016-03-10 | 2020-04-28 | Paxton Access Limited | Dual frequency RFID reader |
| CN108511874A (en) * | 2018-03-13 | 2018-09-07 | 苏州德索文信息科技有限公司 | A kind of liquid RFID antenna and preparation method thereof |
| CN113036409A (en) * | 2021-01-27 | 2021-06-25 | 西安电子科技大学 | Low-profile planar helical antenna adopting novel feed mode |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110907 |