CN205282643U

CN205282643U - Radio -frequency identification antenna

Info

Publication number: CN205282643U
Application number: CN201521136700.XU
Authority: CN
Inventors: 刘星云; 周敏
Original assignee: THINGPLE TECHNOLOGIES Corp
Current assignee: THINGPLE TECHNOLOGIES Corp
Priority date: 2015-12-31
Filing date: 2015-12-31
Publication date: 2016-06-01
Anticipated expiration: 2025-12-31

Abstract

The utility model provides a radio -frequency identification antenna, include: a metal casing, an insulation substrate, set up in on the metal casing, insulation substrate with the metal casing surrounds and forms a cavity cavity, and a radiant panel, set up in in the cavity cavity, the radiant panel includes a plurality of sectorial radiating element, and is a plurality of radiating element forms annular interval arrangement, and is a plurality of directly link a radiating element and a N coupling radiating element including one among the radiating element, it connects a signal source directly to link radiating element, coupling radiating element with directly link the radiating element coupling, adjacent two phase -delay between the coupling radiating element [ 360 (N+1) ] degree, and the amplitude is the same. The utility model discloses the function of discernment of compatible far field and near field discernment to the air reduces the dielectric loss in the radio -frequency identification antenna radiative process as the medium, improves radio -frequency identification antenna's radiant efficiency, and simple structure has simplified production processes, the design of case antenna ization has also improved radio -frequency identification antenna's mechanical strength.

Description

A kind of RFID antenna

Technical field

The utility model relates to microwave antenna art field, specifically, it relates 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 from nineteen nineties rise utilizes radiofrequency signal to carry out noncontact formula two-way communication, automatically identifies target object and obtains the wireless communication technology of relevant information. Along with the progress of science and technology, RFID has related to all respects of people's daily life, being widely used in the various fields such as industrial automation, business automation, traffic operation control management, the traffic supervisory system of such as train, Auto Express-way Toll Collector System, Item Management, production line balance automatization, gate control system, finance transaction, warehouse management, livestock management, vehicle anti-theft etc., RFID technique will become a basic technology of following information society construction.

Rfid system comprises multiple RFID label tag, at least one and the RFID reader with RFID antenna of this RFID label tag communication and the calculating device for controlling this RFID reader usually. Usually, 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 is used for the receptor from RFID tag identity and out of Memory; Calculating device processes the information obtained by RFID reader. The transmitter of RFID reader exports RF (RadioFrequency) via RFID antenna, radiofrequency signal, thus produces electromagnetic field, and this electromagnetic field makes RFID label tag return the RF signal of the information of carrying.

For adapting to the demand of modern communications equipment, the research and development of RFID antenna mainly carry out towards several aspects, are respectively and reduce size, broadband and multiband work, intelligence Pattern control etc. And the omni-directional radio frequency identification tag antenna in existing market all exists that radiation efficiency is lower, polarization mode is single, narrower bandwidth, easily by problems such as ambient interference.

Practical novel content

For defect of the prior art, the purpose of this utility model 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, it is to increase the radiation efficiency of RFID antenna, and structure is simple, simplifying production link, the design of housing antenna also improves the physical strength of RFID antenna.

According to one side of the present utility model, it is provided that a kind of RFID antenna, it is characterised in that, described RFID antenna comprises: a metal housing; One insulated substrate, is arranged on described metal housing, and described insulated substrate and described metal housing surround and form a hollow cavity; And a radiant panel, it is arranged in described hollow cavity, described radiant panel comprises the radiating element of multiple sector, 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 the radiation fin main body of a sector and at least one coupling arm, described radiation fin main body has the inner arc towards the center of circle and deviates from the outer arc in the center of circle, described coupling arm from the inner arc of described radiation fin main body along the radius direction of its circular arc, extend to the center of circle of the radiation fin main body of described sector, non-intersect between described coupling arm.

Preferably, the length of described coupling arm is 1��2 times of the length of the radius of the radiation fin main body of described sector.

Preferably, radiating element described in each comprises two coupling arms, and described two coupling arms extend to the center of circle of the radiation fin main body of described sector 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 radiating element described in each, 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 connecting joint.

Preferably, described radio frequency connecting joint is arranged on described metal housing, and described direct-connected radiating element is connected with described radio frequency connecting joint by coaxial line or parallel double conducting wire.

Preferably, described radiant panel pastes the surface being pressed on described insulated substrate towards described metal housing.

Preferably, the metal sidewall that described metal housing comprises metal bottom surface and is vertically installed 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.

Preferably, described hollow cavity is straight prism or right cylinder.

Preferably, the height of described hollow cavity is 1/10th of described RFID antenna operation wavelength.

Preferably, described hollow cavity is rectangular parallelepiped, 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 right 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 utility model by being arranged between insulated substrate and metal housing by radiant panel, and its multiple radiating element is in annular 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 radiation blind area; In near field, the current direction of its multiple radiating element is identical, it is possible to strengthen the recognition effect near field tag, the function that compatible far field identifies and near field identifies simultaneously. In addition, the metal housing of RFID antenna of the present utility model 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 directive antenna and reduce many accessories, make the structure of RFID antenna more simple, simplify production link, form the physical strength that typical housing design antenna structure also improves RFID antenna.

Accompanying drawing explanation

By reading with reference to the detailed description that non-limiting example is done by the following drawings, other features, objects and advantages of the present utility model will become more obvious:

Fig. 1 is the structural representation of RFID antenna of the present utility model;

Fig. 2 is the vertical view of the housing of RFID antenna of the present utility model;

Fig. 3 is the vertical section structure schematic diagram of the housing of RFID antenna of the present utility model;

Fig. 4 is the structural representation of the radiant panel of RFID antenna of the present utility model; And

Fig. 5 be RFID antenna of the present utility model radiant panel in the structural representation of a radiating element.

Reference numeral

1 metal housing

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 utility model is described further.

Refer to Fig. 1, it illustrates the structural representation of RFID antenna of the present utility model. In the preferred embodiment shown in Fig. 1, RFID antenna of the present utility model comprises metal housing 1, insulated substrate 2 and radiant panel 3.

Please also refer to Fig. 2 and Fig. 3, which respectively show the vertical view of the housing of RFID antenna and vertical section structure schematic diagram. In the preferred embodiment shown in Fig. 2 and Fig. 3, metal housing 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 embodiments more of the present utility model, metal bottom surface 11 can also 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 utility model, the cross section of metal sidewall 12 can also 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 housing 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 can also 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 housing 1 surround and form a hollow cavity 4. Size and dimension and the metal sidewall 12 of hollow cavity 4 are roughly the same, and namely the height of hollow cavity 4 is 1/10th of described RFID antenna operation wavelength. The shape of hollow cavity 4 is straight prism or right cylinder, when hollow cavity 4 be rectangular parallelepiped, 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 housing 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 pasting the mode of pressing. And then, in this embodiment, RFID antenna, using air as medium, reduces the dielectric loss in RFID antenna radiative process, it is to increase the radiation efficiency of RFID antenna.

Please also refer to Fig. 4 and Fig. 5, which respectively show the structural representation of a radiating element of the structural representation of the radiant panel of RFID antenna and radiant panel. Radiant panel 3 comprises multiple radiating element, and described multiple radiating element is arranged in annular, 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 connecting joint (not shown), directly provides energy by leading travelling 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 radiation blind area; And near field, the current direction of its four radiating elements is identical, strengthen the recognition effect near field tag. In an embodiment of the present utility model, described radio frequency connecting joint can be arranged on metal housing 1, and direct-connected radiating element 31 is connected with described radio frequency connecting joint by coaxial line or parallel double conducting wire.

Further, radiating element of the present utility model is described by Fig. 5 for coupled radiation unit 32, it should be noted that, in preferred embodiment of the present utility model, 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, the coupling arm 34 that coupled radiation unit 32 comprises radiation fin main body 33 and extends 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 metallic substance. Specifically, as shown in Figure 4 and Figure 5, radiation fin main body 33 is roughly in fan-shaped, and it has the inner arc towards the center of circle and the outer arc deviating from the center of circle. The inner arc of coupling arm 34 self radiation sheet main body 33, along the radius direction of its circular arc, extends to the center of circle of the radiation fin main body 33 of sector, 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 the radiation fin main body 33 of sector from the two ends of the inner arc of fan-shaped radiation fin main body 33. Owing to 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, mutually vertical (can see two coupling arms 34 in Fig. 5) between two coupling arms 34 of each radiating element.

It should be noted that, in other embodiments of the present utility model, the quantity of the radiating element forming 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 connecting joint are connected to form direct-connected radiating element travelling wave signal directly provide energy by leading, and remaining radiating element obtains energy as coupled radiation unit by coupling. These embodiments can realize equally, does not repeat them here.

In summary, RFID antenna of the present utility model by being arranged between insulated substrate and metal housing by radiant panel, and its multiple radiating element is in annular 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 radiation blind area; In near field, the current direction of its multiple radiating element is identical, it is possible to strengthen the recognition effect near field tag, the function that compatible far field identifies and near field identifies simultaneously. In addition, the metal housing of RFID antenna of the present utility model 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 directive antenna and reduce many accessories, make the structure of RFID antenna more simple, simplify production link, form the physical strength that typical housing design antenna structure also improves RFID antenna.

Although the utility model with preferred embodiment disclose as above, but itself and be not used to limit the utility model. The utility model person of ordinary skill in the field, not departing from spirit and scope of the present utility model, when doing various changes and amendment. Therefore, protection domain of the present utility model ought be as the criterion depending on the scope that claim book defines.

Claims

1. a RFID antenna, it is characterised in that, described RFID antenna comprises:

One metal housing;

One insulated substrate, is arranged on described metal housing, and described insulated substrate and described metal housing surround and form a hollow cavity; And

One radiant panel, it is arranged in described hollow cavity, described radiant panel comprises the radiating element of multiple sector, 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 the radiation fin main body of a sector and at least one coupling arm, described radiation fin main body has the inner arc towards the center of circle and deviates from the outer arc in the center of circle, described coupling arm from the inner arc of described radiation fin main body along the radius direction of its circular arc, extend to the center of circle of the radiation fin main body of described sector, non-intersect between described coupling arm.

3. RFID antenna according to claim 2, it is characterised in that, the length of described coupling arm is 1��2 times of the length of the radius of the radiation fin main body of described sector.

4. RFID antenna according to claim 3, it is characterised in that, radiating element described in each comprises two coupling arms, and described two coupling arms extend to the center of circle of the radiation fin main body of described sector 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, between two coupling arms of radiating element described in each mutually vertically, phase delay 90 degree between two adjacent described coupled radiation units, and amplitude is identical.

6. RFID antenna according to claim 1, it is characterised 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, it is characterised in that, described direct-connected radiating element is connected with a radio frequency connecting joint.

8. RFID antenna according to claim 7, it is characterised in that, described radio frequency connecting joint is arranged on described metal housing, and described direct-connected radiating element is connected with described radio frequency connecting joint by coaxial line or parallel double conducting wire.

9. RFID antenna according to claim 1, it is characterised in that, described radiant panel pastes the surface being pressed on described insulated substrate towards described metal housing.

10. RFID antenna as claimed in any of claims 1 to 9, it is characterized in that, the metal sidewall that described metal housing comprises metal bottom surface and is vertically installed 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, it is characterised in that, described hollow cavity is straight prism or right cylinder.

12. RFID antenna according to claim 11, it is characterised in that, the height of described hollow cavity is 1/10th of described RFID antenna operation wavelength.

13. RFID antenna according to claim 11, it is characterised in that, described hollow cavity is rectangular parallelepiped, 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, it is characterised in that, described hollow cavity is right 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.