CN206546879U - A kind of active RFID tag antenna on anti-metal surface - Google Patents
A kind of active RFID tag antenna on anti-metal surface Download PDFInfo
- Publication number
- CN206546879U CN206546879U CN201720095017.9U CN201720095017U CN206546879U CN 206546879 U CN206546879 U CN 206546879U CN 201720095017 U CN201720095017 U CN 201720095017U CN 206546879 U CN206546879 U CN 206546879U
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- CN
- China
- Prior art keywords
- antenna
- metal surface
- terminal
- rfid tag
- active rfid
- Prior art date
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- 239000002184 metal Substances 0.000 title claims abstract description 66
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 66
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 34
- 229910052802 copper Inorganic materials 0.000 claims abstract description 34
- 239000010949 copper Substances 0.000 claims abstract description 34
- 230000005855 radiation Effects 0.000 claims abstract description 29
- 239000000758 substrate Substances 0.000 claims abstract description 25
- 238000005452 bending Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- QRJOYPHTNNOAOJ-UHFFFAOYSA-N copper gold Chemical compound [Cu].[Au] QRJOYPHTNNOAOJ-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- Details Of Aerials (AREA)
Abstract
The utility model proposes a kind of active RFID tag antenna on anti-metal surface, including antenna body, medium substrate and cover copper metal piece, the antenna body is arranged at the upper surface of the medium substrate, described to cover the lower surface that copper metal piece is fixed on the medium substrate, wherein：The antenna body includes a signal terminal, a ground terminal and a radiation branch, the signal terminal is located between the radiation branch and the ground terminal, it is connected to the radiation branch, and an interdigital structure is provided between the ground terminal, the ground terminal is connected with the copper metal piece that covers.The active RFID tag antenna on anti-metal surface of the present utility model, can work in metal surface without being influenceed by metal surface, it is easily integrated, and performance is stable.
Description
Technical field
The utility model is related to a kind of antenna for Internet of Things active RFID tag, and in particular to a kind of anti-metal surface
Active RFID tag antenna.
Background technology
With flourishing for Internet of Things, upper active RFID (the Radio Frequency of Internet of Things core technology are used as
Identification- radio frequency identifications) technology also obtains tremendous development.Active RFID tag combines various sensors, is also answered
Among various environment.Because the Primary Component built-in aerial in label is easily affected by environment in use, easily
Frequency deviation, antenna pattern deteriorates.Therefore how design environment strong adaptability, be easy to integrated antenna, as RFID label antenna
The problem of design needs to solve.
Mainly there are three kinds of forms, element antenna, IFA (Inverted-F currently used for the built-in aerial of active RFID tag
Antenna) antenna and ceramic antenna.Element antenna is big due to antenna size, and main application is with limiting label sizes small field
Close；Ceramic antenna is mainly used in minimum label sizes and to the less demanding occasion of antenna performance.IFA antennas are due to structure
Compact, size is small, and performance turns into well the preferred antenna structure of active RFID tag.
IFA (Inverted-F Antenna) antenna typically uses printed circuit antenna structure.It is required that antenna is routed in top
Layer, antenna bottom must not floor file.Such structure, when label is installed on the metal surface, shape between antenna and underlying metal
Into very big coupled capacitor, antenna performance can be greatly affected, and label communication performance can be caused to deteriorate.
How a kind of size is designed small, compact conformation can keep antenna performance, and be arranged on metal surface in label again
When, antenna performance is unaffected, is the difficulties in Antenna Design.
Utility model content
The purpose of this utility model is to provide a kind of active RFID tag antenna on anti-metal surface, can worked in
Metal surface by metal surface without being influenceed, and it is easily integrated, and performance is stable.
Therefore, the utility model proposes a kind of active RFID tag antenna on anti-metal surface, it includes antenna master
Body, medium substrate and copper metal piece is covered, the antenna body is arranged at the upper surface of the medium substrate, described to cover copper metal piece
The lower surface of the medium substrate is fixed on, wherein：
The antenna body includes a signal terminal, a ground terminal and a radiation branch, and the signal terminal is located at institute
State between radiation branch and the ground terminal, it is connected to the radiation branch, and provided with an interdigital knot between the ground terminal
Structure, the ground terminal is connected with the copper metal piece that covers.
The active RFID tag antenna on anti-metal surface as described above, wherein, the radiation branch is a strip
Transversal piece, the signal terminal includes vertically arranged an inner terminal and an external terminal, the inner terminal and the outer end
Son interval is connected to the end of the radiation branch, makes the radiation branch be connected to form F type structures with the signal terminal.
The active RFID tag antenna on anti-metal surface as described above, wherein, along length side on the external terminal
To multiple outer end legs are interval with, each outer end leg is transversely extended towards the ground terminal, the earth terminal
Son is a vertical lamellar body, and it is interval with multiple inner legs along its length, and each inner leg is transversely towards described outer
Terminal is extended, and the inner leg is parallel to each other with the outer end leg, and both quantity is equal, each inner branch
Pin is vertically alternately arranged setting successively with each outer end leg, and is not in contact with each other, to form the interdigital structure.
The active RFID tag antenna on anti-metal surface as described above, wherein, the medium substrate is provided with one
Copper vias is covered, the upper end for covering copper vias is in contact with the ground terminal, its lower end connects with the copper metal piece that covers.
The active RFID tag antenna on anti-metal surface as described above, wherein, the other end folding of the radiation branch
Bending is into a U-shape structure.
The active RFID tag antenna on anti-metal surface as described above, wherein, the thickness of the medium substrate is
2mm, its length is 25mm, and its width is 6.25mm.
The utility model proposes anti-metal surface active RFID tag antenna, radiation branch by interdigital structure,
The prevention at radio-frequency port that signal terminal is constituted with ground is connected, it is achieved thereby that the antenna match design of distributed architecture, effectively eliminates day
The influence of floor file below line main body；Due to antenna body lower dielectric base plate bottom, copper metal has been covered in laying in advance, so
Structure, when being further added by metal surface under covering copper metal, on it is of the present utility model influence it is faint, reduce interference；
Radiation branch uses U-shape structure, effectively reduces antenna size.
The utility model proposes anti-metal surface active RFID tag antenna, can work in metal surface without
Influenceed by metal surface, it is easily integrated, performance is stable, it is adaptable to the active RFID tag of Internet of Things field.
Brief description of the drawings
The following drawings is only intended to, in doing the utility model schematic illustration and explanation, not limit model of the present utility model
Enclose.Wherein：
Fig. 1 is the schematic perspective view of the active RFID tag antenna on anti-metal surface of the present utility model.
Fig. 2 is the front view of the active RFID tag antenna on anti-metal surface of the present utility model.
Fig. 3 is the side view of medium substrate in the utility model.
Main element label declaration：
The signal terminal of 1 antenna body 11
The external terminal of 111 inner terminal 112
113 outer end legs
The inner leg of 12 ground terminal 121
The medium substrate of 13 radiation branch 2
21, which cover copper vias 3, covers copper metal piece
Embodiment
The utility model proposes a kind of active RFID tag antenna on anti-metal surface, including antenna body, medium
Substrate and copper metal piece is covered, the antenna body is arranged at the upper surface of the medium substrate, and the copper metal piece that covers is fixed on
The lower surface of the medium substrate, wherein：The antenna body includes a signal terminal, a ground terminal and a radiation branch,
The signal terminal is located between the radiation branch and the ground terminal, and it is connected to the radiation branch, and with the ground connection
An interdigital structure is provided between terminal, the ground terminal is connected with the copper metal piece that covers.It is of the present utility model to work in
Metal surface is easily integrated without the antenna that is influenceed by metal surface, the antenna, performance is stable, it is adaptable to which Internet of Things field has
Source RFID tag.
In order to be more clearly understood to technical characteristic of the present utility model, purpose and effect, below in conjunction with accompanying drawing and
Preferred embodiment, to the utility model proposes anti-metal surface active RFID tag antenna embodiment,
Structure, feature and effect, are described in detail as after.In addition, by the explanation of embodiment, when can be to the utility model up to
The technological means and effect taken into predetermined purpose are able to more deeply specific understanding, but institute's accompanying drawing is only to provide reference
Used with explanation, not for being any limitation as to the utility model.
Fig. 1 is the schematic perspective view of the active RFID tag antenna on anti-metal surface of the present utility model.Fig. 2 is this
The front view of the active RFID tag antenna on the anti-metal surface of utility model.Fig. 3 is medium substrate in the utility model
Side view.
As shown in figure 1, the utility model proposes anti-metal surface active RFID tag antenna, including antenna master
Body 1, medium substrate 2 and copper metal piece 3 is covered, the antenna body 1 is arranged at the upper surface of the medium substrate 2, described to cover copper
Sheet metal 3 is fixed on the lower surface of the medium substrate 2, wherein：
The antenna body 1 includes a signal terminal 11, a ground terminal 12 and a radiation branch 13, the signal terminal
11 are located between the radiation branch 12 and the ground terminal 13, and it is connected to the radiation branch 13, and with the ground terminal
An interdigital structure is provided between 12, the interdigital structure can effectively increase the series electrical capacitance of equivalent L-type matching network, thus
The capacitor element of extra lumped parameter need not be increased, it is achieved thereby that carrying out the purpose of antenna match using distributed constant；Institute
Ground terminal 12 is stated with the copper metal piece 3 that covers to be connected.
It is preferred that the radiation branch 13 is the transversal piece of a strip, the signal terminal 11 includes vertically arranged
One inner terminal 111 and an external terminal 112, the inner terminal 111 are connected to the radiation branch 13 with the external terminal 111 interval
End, makes the radiation branch 13 be connected to form F type structures with the signal terminal 11.
Wherein, multiple outer end legs 113, each outer end leg are interval with the external terminal 112 along its length
113 are transversely extended towards the ground terminal 12, and the ground terminal 12 is a vertical lamellar body, and it is spaced along its length
Provided with multiple inner legs 121, each inner leg 121 is transversely extended towards the external terminal 112, the inner branch
Pin 121 is parallel to each other with the outer end leg 113, and both quantity is equal, each inner leg 121 and each outer end
Leg 113 is vertically alternately arranged setting successively, and is not in contact with each other, to form the interdigital structure.Such as shown in Figure 2, most
Upside first is inner leg 121, and second is outer end leg 113, and the 3rd is inner leg 121 ..., the like,
Each inner leg 121 is set to be alternately arranged placement with outer end leg 113.Wherein, in structure as shown, above-mentioned transverse direction is preferred
It is vertically the width of the medium substrate for the length direction of the medium substrate.
Please also refer to Fig. 2, Fig. 3, the medium substrate 2 covers copper vias 21 provided with one, described to cover the upper of copper vias 21
End is in contact with the ground terminal 12, and its lower end connects with the copper metal piece 3 that covers, thus, can be in advance in the medium base
Through hole is drilled with plate 2, and using PCB technology in the through hole overlying copper, so that covering copper vias 21 described in being formed carrys out equivalent metal post,
Make its two ends correspondence and the ground terminal 12 and cover copper metal piece 3 and be connected, in order to the ground terminal 12 and to cover copper golden
Belong to the connection between piece 3.
In order to effectively reduce antenna size, the other end bending of preferably described radiation branch 13 forms a U-shape structure.As schemed
Show, preferably the U-shape structure is located at the phase homonymy of radiation branch 13 with the ground terminal 12, and it is open towards the ground terminal
12.Constituted in practical application, the medium substrate is preferably rigid material, e.g. dielectric constant is the print that 44, thickness is 2mm
Printed circuit board base material, and medium substrate size is 25mm (length) * 6.25mm (width).Additionally, it is preferred that antenna of the present utility model
Working frequency is in 2.4-2.483GHz.
The utility model proposes anti-metal surface active RFID tag antenna, prevention at radio-frequency port and interdigital structure
Left part (external terminal 112 in Fig. 2) is connected, and the right part (the inner leg 121 in Fig. 2) of interdigital structure is by covering copper
Through hole is grounded, it is achieved thereby that the inverted-L antenna matching network design of distributed architecture, effectively eliminates floor file below antenna body
Influence；Due to antenna body lower dielectric base plate bottom, copper metal has been covered in laying in advance, in such structure, when covering copper gold
It is faint on influence of the present utility model when subordinate is further added by metal surface, reduce interference.
The schematical embodiment of the utility model is the foregoing is only, model of the present utility model is not limited to
Enclose.Any those skilled in the art, the equivalent variations made on the premise of design of the present utility model and principle is not departed from
With modification, the scope of the utility model protection all should be belonged to.
Claims (6)
1. a kind of active RFID tag antenna on anti-metal surface, it is characterised in that the active of anti-metal surface is penetrated
Frequency identification tag antenna includes antenna body, medium substrate and covers copper metal piece, and the antenna body is arranged at the medium base
The upper surface of plate, it is described to cover the lower surface that copper metal piece is fixed on the medium substrate, wherein：
The antenna body includes a signal terminal, a ground terminal and a radiation branch, and the signal terminal is located at the spoke
Between ray and the ground terminal, it is connected to the radiation branch, and provided with an interdigital structure, institute between the ground terminal
Ground terminal is stated with the copper metal piece that covers to be connected.
2. the active RFID tag antenna on anti-metal surface as claimed in claim 1, it is characterised in that the radiation branch
For the transversal piece of a strip, the signal terminal includes vertically arranged an inner terminal and an external terminal, the inner terminal
The end of the radiation branch is connected to the external terminal interval, makes the radiation branch be connected to form F with the signal terminal
Type structure.
3. the active RFID tag antenna on anti-metal surface as claimed in claim 2, it is characterised in that the external terminal
On be interval with multiple outer end legs along its length, each outer end leg is transversely extended towards the ground terminal,
The ground terminal is a vertical lamellar body, and it is interval with multiple inner legs along its length, and each inner leg edge is horizontal
It is extended to towards the external terminal, the inner leg is parallel to each other with the outer end leg, and both quantity is equal, respectively
The inner leg is vertically alternately arranged setting successively with each outer end leg, and is not in contact with each other, described interdigital to be formed
Structure.
4. the active RFID tag antenna on the anti-metal surface as described in claim 1 or 3, it is characterised in that given an account of
Matter substrate covers copper vias provided with one, and the upper end for covering copper vias is in contact with the ground terminal, and its lower end is covered with described
Copper metal piece connects.
5. the active RFID tag antenna on anti-metal surface as claimed in claim 2 or claim 3, it is characterised in that the spoke
The other end bending of ray forms a U-shape structure.
6. the active RFID tag antenna on anti-metal surface as claimed in claim 1, it is characterised in that the medium base
The thickness of plate is 2mm, and its length is 25mm, and its width is 6.25mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720095017.9U CN206546879U (en) | 2017-01-24 | 2017-01-24 | A kind of active RFID tag antenna on anti-metal surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720095017.9U CN206546879U (en) | 2017-01-24 | 2017-01-24 | A kind of active RFID tag antenna on anti-metal surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206546879U true CN206546879U (en) | 2017-10-10 |
Family
ID=59993055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720095017.9U Active CN206546879U (en) | 2017-01-24 | 2017-01-24 | A kind of active RFID tag antenna on anti-metal surface |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206546879U (en) |
-
2017
- 2017-01-24 CN CN201720095017.9U patent/CN206546879U/en active Active
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