CN105470637A - Radio frequency identification antenna - Google Patents
Radio frequency identification antenna Download PDFInfo
- Publication number
- CN105470637A CN105470637A CN201511030029.5A CN201511030029A CN105470637A CN 105470637 A CN105470637 A CN 105470637A CN 201511030029 A CN201511030029 A CN 201511030029A CN 105470637 A CN105470637 A CN 105470637A
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- Prior art keywords
- rfid antenna
- radiating element
- antenna according
- hollow cavity
- direct
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/42—Housings not intimately mechanically associated with radiating elements, e.g. radome
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- Waveguide Aerials (AREA)
Abstract
The invention provides a radio frequency identification antenna, which comprises a metal shell, an insulating substrate and a radiation panel, wherein the insulating substrate is arranged on the metal shell; a hollow cavity is surrounded by the insulating substrate and the metal shell; the radiation panel is arranged in the hollow cavity and comprises a plurality of fan-shaped radiation elements; the plurality of fan-shaped radiation elements are arranged at annular intervals; the plurality of radiation elements comprise a direct-connected radiation element and N coupled radiation elements; the direct-connected radiation element is connected with a signal source; the coupled radiation elements are coupled to the direct-connected radiation element; a phase delay of [360/(N+1)] degrees is formed between two adjacent coupled radiation elements; and the amplitudes are the same.
Description
Technical field
The present invention relates to microwave antenna art field, particularly, relate to a kind of far and near field cavity RFID antenna.
Background technology
RFID is the abbreviation of radio RF recognition technology (RadioFrequencyIdentification), RFID is commonly called as electronic tag, RFID technique is that of rising from nineteen nineties utilizes radiofrequency signal to carry out contactless two-way communication, automatically identifies destination object and obtains the wireless communication technology of relevant information.Along with the progress of science and technology, RFID has related to the various aspects of people's daily life, be widely used in the various fields such as industrial automation, business automation, the management of traffic s operation control, the traffic surveillance and control system, Auto Express-way Toll Collector System, Item Management, production line balance automation, gate control system, financial transaction, storehouse management, livestock management, vehicle anti-theft etc. of such as train, RFID technique will become a basic technology of Future Information social construction.
Rfid system normally comprises multiple RFID label tag, the RFID reader with RFID antenna that at least one communicates with this RFID label tag and the calculation element for controlling this RFID reader.Normally, RFID label tag is made up of RFID label antenna and label chip; RFID reader comprises: for energy or information being provided to the transmitter of RFID label tag and being used for receiving from RFID label tag the receiver of identity and out of Memory; The information that calculation element process is obtained by RFID reader.The transmitter of RFID reader exports RF (RadioFrequency) via RFID antenna, radiofrequency signal, thus generates an electromagnetic field, and this electromagnetic field makes RFID label tag return the RF signal of carry information.
For adapting to the demand of modern communications equipment, the research and development of RFID antenna are mainly carried out towards several aspect, are respectively and reduce size, broadband and multiband work, intelligent Pattern control etc.And omni-directional radio frequency identification label antenna in the market all exists, and radiation efficiency is lower, polarization mode is single, bandwidth is narrower, easily by problems such as environmental interference.
Summary of the invention
For defect of the prior art, the object of the present invention is to provide a kind of RFID antenna, the function that the compatible far field of this RFID antenna identifies and near field identifies, using air as medium, reduce the dielectric loss in RFID antenna radiative process, improve the radiation efficiency of RFID antenna, and structure is simple, simplify production link, the design of body type antenna also improves the mechanical strength of RFID antenna.
According to an aspect of the present invention, provide a kind of RFID antenna, it is characterized in that, described RFID antenna comprises: a metal shell; One insulated substrate, is arranged on described metal shell, and described insulated substrate surrounds formation one hollow cavity in described metal shell; And a radiant panel, be arranged in described hollow cavity, described radiant panel comprises multiple fan-shaped radiating element, multiple described radiating element forms annular space arrangement, a direct-connected radiating element and N number of coupled radiation unit is comprised among multiple described radiating element, described direct-connected radiating element connects a signal source, described coupled radiation unit is coupled with described direct-connected radiating element, phase delay [360/ (N+1)] degree between two adjacent described coupled radiation units, and amplitude is identical, wherein, N is positive integer.
Preferably, described radiating element comprises a fan-shaped radiation fin main body and at least one coupling arm, described radiation fin main body has towards the inner arc in the center of circle and the outer arc deviating from the center of circle, described coupling arm from the inner arc of described radiation fin main body along the radial direction of its circular arc, the center of circle to described fan-shaped radiation fin main body extends, non-intersect between described coupling arm.
Preferably, the length of described coupling arm is 1 ~ 2 times of the length of the radius of described fan-shaped radiation fin main body.
Preferably, each described radiating element comprises two coupling arms, and described two coupling arms extend to the center of circle of described fan-shaped radiation fin main body from the two ends of the inner arc of fan-shaped described radiation fin main body.
Preferably, described radiant panel comprises a direct-connected radiating element and 3 coupled radiation units, mutually vertical between two coupling arms of each described radiating element, phase delay 90 degree between two adjacent described coupled radiation units, and amplitude is identical.
Preferably, the spacing between described multiple radiating element is greater than 0.001 times of described RFID antenna operation wavelength, is less than 0.01 times of described RFID antenna operation wavelength.
Preferably, described direct-connected radiating element is connected with a radio frequency connector.
Preferably, described radio frequency connector is arranged on described metal shell, and described direct-connected radiating element is connected with described radio frequency connector by coaxial line or parallel double conducting wire.
Preferably, described radiant panel pastes the surface be pressed on towards described metal shell on described insulated substrate.
Preferably, described metal shell comprises metal bottom surface and is vertically installed in the metal sidewall on described metal bottom surface, and the end face of described metal sidewall has an inner shoulder table respectively, and described insulated substrate is connected on the inner shoulder table of described metal sidewall.
Preferably, described hollow cavity is right prism or cylinder.
Preferably, the height of described hollow cavity is 1/10th of described RFID antenna operation wavelength.
Preferably, described hollow cavity is cuboid, and the length of its bottom surface and width are respectively 0.5 to 1.5 times of the operation wavelength of described RFID antenna.
Preferably, described hollow cavity is cylinder, and the radius of the bottom surface of described hollow cavity is 0.5 to 1.5 times of described RFID antenna operation wavelength.
RFID antenna of the present invention is by being arranged between insulated substrate and metal shell by radiant panel, and its multiple radiating element ringwise and spaced setting, two groups of orthogonal linear polarization characteristics can be presented in far field, the recognition effect superposition of multiple radiating element, reduces dead angle; In near field, the current direction of its multiple radiating element is identical, can strengthen the recognition effect near field tag, the function that compatible far field identifies and near field identifies simultaneously.In addition, the metal shell of RFID antenna of the present invention and insulated substrate form a hollow cavity, radiant panel is arranged at this hollow cavity, using air as medium, reduce the dielectric loss in RFID antenna radiative process, improve the radiation efficiency of RFID antenna, and compare existing directional antenna and reduce many accessories, make the structure of RFID antenna more simple, simplify production link, form the mechanical strength that typical housing design antenna structure also improves RFID antenna.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the structural representation of RFID antenna of the present invention;
Fig. 2 is the vertical view of the housing of RFID antenna of the present invention;
Fig. 3 is the vertical section structure schematic diagram of the housing of RFID antenna of the present invention;
Fig. 4 is the structural representation of the radiant panel of RFID antenna of the present invention; And
Fig. 5 is the structural representation of a radiating element in the radiant panel of RFID antenna of the present invention.
Reference numeral
1 metal shell
11 metal bottom surfaces
12 metal sidewall
121 inner shoulder tables
2 insulated substrates
3 radiant panels
31 direct-connected radiating elements
32,32 ', 32 " coupled radiation unit
33 radiation fin main bodys
34 coupling arms
4 hollow cavities
5 spacing
Embodiment
Below in conjunction with drawings and Examples, technology contents of the present invention is described further.
Refer to Fig. 1, it illustrates the structural representation of RFID antenna of the present invention.In the preferred embodiment shown in Fig. 1, RFID antenna of the present invention comprises metal shell 1, insulated substrate 2 and radiant panel 3.
Please also refer to Fig. 2 and Fig. 3, which respectively show vertical view and the vertical section structure schematic diagram of the housing of RFID antenna.In the preferred embodiment shown in Fig. 2 and Fig. 3, metal shell 1 comprises metal bottom surface 11 and metal sidewall 12.Metal bottom surface 11 is a rectangular flat.The length of metal bottom surface 11 is preferably 0.5 to 1.5 times of described RFID antenna operation wavelength.Wherein, the operation wavelength of RFID antenna is preferably 32cm.
Preferably, metal sidewall 12 is vertically installed on metal bottom surface 11.The cross section of metal sidewall 12 is rectangle, and wherein, the cross section of metal sidewall 12 refers to the cross section parallel with metal bottom surface 11.The length of the cross section of metal sidewall 12 and wide scope are 0.5 to 1 times of described RFID antenna operation wavelength.The height of metal sidewall 12 is 1/10th of described RFID antenna operation wavelength.
It should be noted that, in some embodiments of the invention, metal bottom surface 11 also can be a circular flat board.The diameter of metal bottom surface 11 is preferably 0.5 to 1.5 times of described RFID antenna operation wavelength.In addition, in other embodiments of the present invention, the cross section of metal sidewall 12 also can be circular.The scope of the diameter of the cross section of metal sidewall 12 is 0.5 to 1 times of described RFID antenna operation wavelength.
Further, as shown in Figure 1, insulated substrate 2 is arranged on metal shell 1.Specifically, in the preferred embodiment shown in Fig. 1 and Fig. 3, the end, one end (end face) that metal sidewall 12 is not connected with metal bottom surface 11 has an inner shoulder table 121 (can see Fig. 3).The shape and size of insulated substrate 2 and the cross section of metal sidewall 12 adapt, and namely the shape of insulated substrate 2 also can be rectangle or circle, and then insulated substrate 2 is arranged on the inner shoulder table 121 of metal sidewall 12, is fixedly connected with metal sidewall 12.Insulated substrate 2 and metal shell 1 surround formation one hollow cavity 4.The size and dimension of hollow cavity 4 is roughly the same with metal sidewall 12, and namely the height of hollow cavity 4 is 1/10th of described RFID antenna operation wavelength.The shape of hollow cavity 4 is right prism or cylinder, when hollow cavity 4 be cuboid, its cross section (bottom surface) for rectangle time, the length of its cross section and wide scope are 0.5 to 1 times of described RFID antenna operation wavelength; When the cross section of hollow cavity 4 is circular, the diameter of its cross section (bottom surface) is 0.5 to 1 times of described RFID antenna operation wavelength.
As shown in Figure 1, radiant panel 3 is arranged at the side of insulated substrate 2.Specifically, radiant panel 3 is between metal shell 1 and insulated substrate 2, and namely radiant panel 3 is arranged in hollow cavity 4.Radiant panel 3 and insulated substrate 2 are affixed.Preferably, radiant panel 3 is attached on insulated substrate 2 by the mode pasting pressing.And then in this embodiment, RFID antenna, using air as medium, reduces the dielectric loss in RFID antenna radiative process, improves the radiation efficiency of RFID antenna.
Please also refer to Fig. 4 and Fig. 5, which respectively show the structural representation of the structural representation of the radiant panel of RFID antenna and a radiating element of radiant panel.Radiant panel 3 comprises multiple radiating element, and described multiple radiating element is arranged ringwise, and spaced between described multiple radiating element.Specifically, radiant panel 3 comprises a direct-connected radiating element and N number of coupled radiation unit.Wherein, direct-connected radiating element connects a signal source, and coupled radiation unit is coupled with direct-connected radiating element, phase delay [360/ (N+1)] degree (N is positive integer) between two adjacent coupled radiation units, and amplitude is identical.In the preferred embodiment shown in Fig. 4, radiant panel 3 comprises four radiating elements, is respectively a direct-connected radiating element 31 and three coupled radiation units 32,32 ', 32 ".Direct-connected radiating element 31 and three coupled radiation units 32,32 ', 32 " formed one circular.Between direct-connected radiating element 31 and adjacent two coupled radiation units 32 and 32 ' and coupled radiation unit 32 and 32 " between and coupled radiation unit 32 ' and 32 " between all there is a spacing 5, spacing 5 is greater than 0.001 times of described RFID antenna operation wavelength, is less than 0.01 times of described RFID antenna operation wavelength.Wherein, direct-connected radiating element 31 is connected with a radio frequency connector (not shown), directly provides energy by guided wave signal.Three coupled radiation units 32,32 ', 32 " obtain energy by coupling.Preferably, between two adjacent coupled radiation units between (i.e. coupled radiation unit 32 and 32 " or coupled radiation unit 32 ' and 32 " between) phase delay 90 degree, and amplitude is identical.And then in this embodiment, RFID antenna can present two groups of orthogonal linear polarization characteristics in far field, the recognition effect superposition of four radiating elements, reduces dead angle; And near field, the current direction of its four radiating elements is identical, strengthen the recognition effect near field tag.In one embodiment of the invention, described radio frequency connector can be arranged on metal shell 1, and direct-connected radiating element 31 is connected with described radio frequency connector by coaxial line or parallel double conducting wire.
Further, for coupled radiation unit 32, radiating element of the present invention is described in Fig. 5, it should be noted that, in a preferred embodiment of the invention, coupled radiation unit 32 and coupled radiation unit 32 ', 32 " and the structure of direct-connected radiating element 31 substantially identical.
As shown in Figure 5, coupled radiation unit 32 coupling arm 34 that comprises radiation fin main body 33 and extended to the center of radiant panel 3 by radiation fin main body 33.Preferably, radiation fin main body 33 and coupling arm 34 are made by metal material.Specifically, as shown in Figure 4 and Figure 5, radiation fin main body 33 is roughly in fan-shaped, and it has towards the inner arc in the center of circle and the outer arc deviating from the center of circle.The inner arc of coupling arm 34 autoradiolysis sheet main body 33 is along the radial direction of its circular arc, and the center of circle to fan-shaped radiation fin main body 33 extends, non-intersect between coupling arm 34.The length of coupling arm 34 is the length 1 ~ 2 times of the radius of fan-shaped radiation fin main body 33.In the embodiment shown in Fig. 4 and Fig. 5, coupled radiation unit 32 comprises two coupling arms 34, two coupling arms 34 are arranged at the both sides of radiation fin main body 33 respectively, and two coupling arms 34 extend to the center of circle of fan-shaped radiation fin main body 33 from the two ends of the inner arc of fan-shaped radiation fin main body 33.Because radiant panel 3 in the embodiment shown in Fig. 4 comprises a direct-connected radiating element 31 and three coupled radiation units 32,32 ', 32 " totally four radiating elements; therefore; after composition annular, between two coupling arms 34 of each radiating element mutually vertical (can see the coupling arm of two in Fig. 5 34).
It should be noted that, in other embodiments of the invention, the quantity forming the radiating element of radiant panel can change, such as can be made up of five or six radiating elements, multiple radiating element is formed circular, interval is arranged each other, and the coupling arm of each radiating element all extends to the center of radiant panel, wherein, any one radiating element and radio frequency connector are connected to form direct-connected radiating element and directly provide energy by guided wave signal, and remaining radiating element obtains energy as coupled radiation unit by coupling.These embodiments can realize equally, do not repeat them here.
In summary, RFID antenna of the present invention is by being arranged between insulated substrate and metal shell by radiant panel, and its multiple radiating element ringwise and spaced setting, two groups of orthogonal linear polarization characteristics can be presented in far field, the recognition effect superposition of multiple radiating element, reduces dead angle; In near field, the current direction of its multiple radiating element is identical, can strengthen the recognition effect near field tag, the function that compatible far field identifies and near field identifies simultaneously.In addition, the metal shell of RFID antenna of the present invention and insulated substrate form a hollow cavity, radiant panel is arranged at this hollow cavity, using air as medium, reduce the dielectric loss in RFID antenna radiative process, improve the radiation efficiency of RFID antenna, and compare existing directional antenna and reduce many accessories, make the structure of RFID antenna more simple, simplify production link, form the mechanical strength that typical housing design antenna structure also improves RFID antenna.
Although the present invention with preferred embodiment disclose as above, but itself and be not used to limit the present invention.Those skilled in the art, without departing from the spirit and scope of the present invention, when doing various changes and amendment.Therefore, the scope that protection scope of the present invention ought define depending on claims is as the criterion.
Claims (14)
1. a RFID antenna, is characterized in that, described RFID antenna comprises:
One metal shell;
One insulated substrate, is arranged on described metal shell, and described insulated substrate surrounds formation one hollow cavity in described metal shell; And
One radiant panel, be arranged in described hollow cavity, described radiant panel comprises multiple fan-shaped radiating element, multiple described radiating element forms annular space arrangement, a direct-connected radiating element and N number of coupled radiation unit is comprised among multiple described radiating element, described direct-connected radiating element connects a signal source, described coupled radiation unit is coupled with described direct-connected radiating element, phase delay [360/ (N+1)] degree between two adjacent described coupled radiation units, and amplitude is identical, wherein, N is positive integer.
2. RFID antenna according to claim 1, it is characterized in that, described radiating element comprises a fan-shaped radiation fin main body and at least one coupling arm, described radiation fin main body has towards the inner arc in the center of circle and the outer arc deviating from the center of circle, described coupling arm from the inner arc of described radiation fin main body along the radial direction of its circular arc, the center of circle to described fan-shaped radiation fin main body extends, non-intersect between described coupling arm.
3. RFID antenna according to claim 2, is characterized in that, the length of described coupling arm is 1 ~ 2 times of the length of the radius of described fan-shaped radiation fin main body.
4. RFID antenna according to claim 3, is characterized in that, each described radiating element comprises two coupling arms, and described two coupling arms extend to the center of circle of described fan-shaped radiation fin main body from the two ends of the inner arc of fan-shaped described radiation fin main body.
5. RFID antenna according to claim 4, it is characterized in that, described radiant panel comprises a direct-connected radiating element and 3 coupled radiation units, mutually vertical between two coupling arms of each described radiating element, phase delay 90 degree between two adjacent described coupled radiation units, and amplitude is identical.
6. RFID antenna according to claim 1, is characterized in that, the spacing between described multiple radiating element is greater than 0.001 times of described RFID antenna operation wavelength, is less than 0.01 times of described RFID antenna operation wavelength.
7. RFID antenna according to claim 1, is characterized in that, described direct-connected radiating element is connected with a radio frequency connector.
8. RFID antenna according to claim 7, is characterized in that, described radio frequency connector is arranged on described metal shell, and described direct-connected radiating element is connected with described radio frequency connector by coaxial line or parallel double conducting wire.
9. RFID antenna according to claim 1, is characterized in that, described radiant panel pastes the surface be pressed on towards described metal shell on described insulated substrate.
10. RFID antenna as claimed in any of claims 1 to 9, it is characterized in that, described metal shell comprises metal bottom surface and is vertically installed in the metal sidewall on described metal bottom surface, the end face of described metal sidewall has an inner shoulder table respectively, and described insulated substrate is connected on the inner shoulder table of described metal sidewall.
11. RFID antenna according to claim 10, is characterized in that, described hollow cavity is right prism or cylinder.
12. RFID antenna according to claim 11, is characterized in that, the height of described hollow cavity is 1/10th of described RFID antenna operation wavelength.
13. RFID antenna according to claim 11, is characterized in that, described hollow cavity is cuboid, and the length of its bottom surface and width are respectively 0.5 to 1.5 times of the operation wavelength of described RFID antenna.
14. RFID antenna according to claim 11, is characterized in that, described hollow cavity is cylinder, and the radius of the bottom surface of described hollow cavity is 0.5 to 1.5 times of described RFID antenna operation wavelength.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511030029.5A CN105470637A (en) | 2015-12-31 | 2015-12-31 | Radio frequency identification antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201511030029.5A CN105470637A (en) | 2015-12-31 | 2015-12-31 | Radio frequency identification antenna |
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| CN105470637A true CN105470637A (en) | 2016-04-06 |
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| CN201511030029.5A Pending CN105470637A (en) | 2015-12-31 | 2015-12-31 | Radio frequency identification antenna |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114497991A (en) * | 2020-11-11 | 2022-05-13 | 永道无线射频标签（香港）有限公司 | Antenna structure |
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| CN114497991A (en) * | 2020-11-11 | 2022-05-13 | 永道无线射频标签（香港）有限公司 | Antenna structure |
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Application publication date: 20160406 |