CN208299032U - A kind of miniaturization directed radiation MIMO reader antenna for RFID - Google Patents
A kind of miniaturization directed radiation MIMO reader antenna for RFID Download PDFInfo
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- CN208299032U CN208299032U CN201820854143.2U CN201820854143U CN208299032U CN 208299032 U CN208299032 U CN 208299032U CN 201820854143 U CN201820854143 U CN 201820854143U CN 208299032 U CN208299032 U CN 208299032U
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- patch
- medium substrate
- minor matters
- mimo
- rectangle frame
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Abstract
The utility model relates to a kind of miniaturization directed radiation MIMO reader antennas for RFID, including first medium substrate, second medium substrate, radiation patch, earth plate and reflector patch, first medium substrate and second medium substrate are setting up and down, radiation patch is printed on the upper surface of first medium substrate, including rectangle frame patch, four T shape minor matters and 3dB electric bridge, four T shape minor matters center symmetric settings, the vertical edge of each T shape minor matters is connected respectively a side of rectangle frame patch, 3dB electric bridge is set at the center of rectangle frame patch along the diagonal line of rectangle frame patch, two input ports of 3dB electric bridge are connected with the respective side of adjacent rectangle frame patch respectively, earth plate is printed on the lower surface of first medium substrate, reflector patch is printed on the upper surface of second medium substrate.Compared with prior art, the utility model covers RFID frequency range, functional, size is small and exquisite, is suitably applied in mobile terminal device.
Description
Technical field
The utility model relates to wireless communication technology fields, more particularly, to a kind of miniaturization directed radiation for RFID
MIMO reader antenna.
Background technique
With the proposition of the concepts such as " industrialize and merged with informationization ", " the wisdom earth ", " sensing China ", Internet of Things conduct
The important representative field of strategic type new industry, has started third time information technology tide.Internet of Things is exactly to be known by radio frequency
Not (Radio Frequency identification, RFID), infrared sensor, wireless sensor technology, laser scanner, complete
The information sensing devices such as ball positioning system connect any article with Internet by the agreement of agreement, carry out information friendship
It changes and communicates, to realize a kind of network of Weigh sensor, positioning, tracking, monitoring and management.In this network, essence
It is exactly using wireless RFID technique, childhood crosses the interconnection of the automatic identification and information of computer internet realization article and shares.
Important component of the antenna as RFID system, the front end in RFID system, be electromagnetic wave outlet and
Entrance, the transmitting and reception of electromagnetic wave are all completed by antenna.Antenna is to influence the performances such as RFID system reliability
The requirement of one of key factor, performance indicator needed for selecting suitable antenna period to meet system is very important.Due to
Label placement position is not fixed, therefore it is required that the antenna for reading its information is circular polarisation.In the field RFID, circular polarized antenna
There is important application, it has also become current domestic and international research hotspot.Compared with linear polarized antenna, circular polarized antenna application is wider, sends out
It is bigger to open up potentiality.The spreading speed of RFID device is greatly speeded up to the research association of circular polarized antenna.RFID antenna is in addition to the property pursued
Can and quality promotion outside, will towards the application aspect of wideband and multifrequency develop, in specific manufacturing technology will towards miniaturization,
The direction for planarizing and being easy to make is developed.Therefore there is wide answer in RFID system for the research for minimizing loop aerial
Use prospect.
MIMO(Multiple-Input Multiple-Output) technology refer to used respectively in transmitting terminal and receiving end it is more
A transmitting antenna and receiving antenna make signal by the transmission of the mutiple antennas of transmitting terminal and receiving end and receive, so as to improve logical
Believe quality.
Utility model content
The purpose of this utility model is exactly to provide a kind of for RFID to overcome the problems of the above-mentioned prior art
Miniaturization directed radiation MIMO reader antenna, cover RFID frequency range, it is functional, size is small and exquisite, be suitably applied in movement
In terminal device.
The purpose of this utility model can be achieved through the following technical solutions:
A kind of miniaturization directed radiation MIMO reader antenna for RFID, including first medium substrate, second medium
Substrate, radiation patch, earth plate and reflector patch, the first medium substrate and second medium substrate are setting up and down, described
Radiation patch is printed on the upper surface of first medium substrate, including rectangle frame patch, four T shape minor matters and 3dB electric bridge, four T
Shape minor matters center symmetric setting, the vertical edge of each T shape minor matters are connected respectively a side of rectangle frame patch, and T shape minor matters
Horizontal edge be located in rectangle frame patch, the 3dB electric bridge along rectangle frame patch diagonal line be set to rectangle frame patch center at,
Two input ports of 3dB electric bridge are connected with the respective side of adjacent rectangle frame patch respectively, two outputs of 3dB electric bridge
As feeding point, the earth plate is printed on the lower surface of first medium substrate for port, and the reflector patch is printed on second
The upper surface of medium substrate.
At a quarter of a side that the vertical edge of each T shape minor matters is connected respectively rectangle frame patch.
The horizontal edge of each T shape minor matters is parallel with the respective side of rectangle frame patch respectively.
The size of four T shape minor matters is identical.
The earth plate includes rectangular patch and two F shape minor matters, and the rectangular patch is located under first medium substrate
At centre of surface, two F type minor matters, which correspond, to be located close on the outside of the side of the rectangular patch of two feeding points, each F shape
Two horizontal edges of minor matters are connected with the respective side of rectangular patch, and the top of two F shape minor matters is towards rectangular patch
The same right angle.
The vertical edge of each F type minor matters is parallel with the respective side of rectangular patch respectively.
The size of described two F shape minor matters is identical.
The reflector patch rectangular frame-shaped, and each middle side edge of reflector patch concaves.
It is air layer between the first medium substrate and second medium substrate.
Compared with prior art, the utility model, which has the advantage that, is designed as dual-port feedback for the structure of radiation patch
Electricity has preferable interport isolation, day line width impedance bandwidth and wide axial ratio bandwidth may be implemented, while docking floor panel structure
Design is realized while directed radiation, antenna thin (low section) and can guarantee antenna broadband.The antenna size can be
74.2mm × 74.2mm × 5mm realizes miniaturization.The antenna performance is good, size is small and exquisite, is suitably applied in mobile terminal device
In.
Detailed description of the invention
Fig. 1 is the perspective view for minimizing directed radiation MIMO reader antenna；
Fig. 2 is the front view for minimizing directed radiation MIMO reader antenna；
Fig. 3 is the structural schematic diagram of first medium upper surface of base plate；
Fig. 4 is the structural schematic diagram of first medium base lower surface；
Fig. 5 is the structural schematic diagram of second medium upper surface of base plate；
Fig. 6 is the schematic diagram of the radiation patch region when overlooking miniaturization directed radiation MIMO reader antenna；
Fig. 7 is the schematic diagram of the earth plate region when overlooking miniaturization directed radiation MIMO reader antenna；
Fig. 8 is the schematic diagram of the reflector patch region when overlooking miniaturization directed radiation MIMO reader antenna；
Fig. 9 is the reflection coefficient simulation result diagram for minimizing directed radiation MIMO reader antenna；
Figure 10 is the Circular polarization ratio bandwidth simulation result diagram for minimizing directed radiation MIMO reader antenna；
Figure 11 be minimize directed radiation MIMO reader antenna the face XOZ directional diagram；
Figure 12 is the isolation figure minimized between directed radiation MIMO reader antenna port.
In figure, 1, first medium substrate, 2, second medium substrate, 3, radiation patch, 31, rectangle frame patch, 32, T shape branch
Section, 33,3dB electric bridge, 4, earth plate, 41, rectangular patch, 42, F shape minor matters, 5, reflector patch, 6, air layer, A, feeding point.
Specific embodiment
The utility model is described in detail in the following with reference to the drawings and specific embodiments.The present embodiment is with the utility model
Implemented premised on technical solution, the detailed implementation method and specific operation process are given, but the guarantor of the utility model
Shield range is not limited to the following embodiments.
As Figure 1-Figure 8, a kind of miniaturization directed radiation MIMO reader antenna for RFID includes first medium
Substrate 1, second medium substrate 2, radiation patch 3, earth plate 4 and reflector patch 5, first medium substrate 1 and second medium base
Plate 2 is setting up and down, is air layer 6, radiation patch 3, earth plate 4 and reflection between first medium substrate 1 and second medium substrate 2
Device patch 5 is three layers of conductor, and radiation patch 3 is antenna body part, and radiation patch 3 is printed on the upper table of first medium substrate 1
Face, earth plate 4 are printed on the lower surface of first medium substrate 1, earth plate of the earth plate 4 as 3 center coupler of radiation patch,
Reflector patch 5 is printed on the upper surface of second medium substrate 2, reflector patch 5 for realizing antenna directed radiation.
As shown in figure 3, radiation patch 3 includes 31, four T shape minor matters 32 of rectangle frame patch and 3dB electric bridge 33, four T shapes
32 center symmetric setting of minor matters, the vertical edge of each T shape minor matters 32 are connected respectively four points of a side of rectangle frame patch 31
One of place, and the horizontal edge of T shape minor matters 32 is located in rectangle frame patch 31, and 3dB electric bridge 33 is set along the diagonal line of rectangle frame patch 31
At the center of rectangle frame patch 31, two input ports of 3dB electric bridge 33 are corresponding with adjacent rectangle frame patch 31 respectively
Side is connected, and the horizontal edge of each T shape minor matters 32 is parallel with the respective side of rectangle frame patch 31 respectively, T shape minor matters 32
Horizontal edge and vertical edge are perpendicular, and two output ports of 3dB electric bridge 33 are as feeding point A.Radiation patch 3 is designed as dual-port feedback
Electricity has preferable interport isolation, and day line width impedance bandwidth and wide axial ratio bandwidth may be implemented.Grey filling region in Fig. 6
For radiation patch 3.
The excitation of 3dB electric bridge 33 is located at two ports in the lower left corner in Fig. 3, and two ports in the upper right corner are directly to rectangle frame
Patch 31 is fed.The structure of four T shape minor matters 32 is identical and equal sized, and 31 width of rectangle frame patch is equal.
As shown in figure 4, earth plate 4 includes that rectangular patch 41 and two F shape minor matters 42, rectangular patch 41 are located at first medium
At the lower surface center of substrate 1, two F type minor matters correspond the side for being located close to the rectangular patch 41 of two feeding point A
Two horizontal edges in outside, each F shape minor matters 42 are connected with the respective side of rectangular patch 41, the vertical edge of each F type minor matters
Parallel with the respective side of rectangular patch 41 respectively, the horizontal edge and vertical edge of F type minor matters are perpendicular, the top of two F shape minor matters 42
End is towards the same right angle of rectangular patch 41.The structure of two F shape minor matters 42 is identical and equal sized.Grey in Fig. 7
Filling region is earth plate 4.
As shown in figure 5,5 rectangular frame-shaped of reflector patch, and each middle side edge of reflector patch 5 concaves.
It may be implemented while directed radiation by the design of reflector patch 5, antenna thin (low section) and can guarantee antenna wideband
Band.Grey filling region is reflector patch 5 in Fig. 8.
First medium substrate 1 and second medium substrate 2 are RF4 medium substrate, use model IT- in the present embodiment
The medium substrate of 8350G.
The miniaturization directed radiation MIMO reader antenna swashs the feed placement of loop antenna by adjusting 3dB electric bridge 33
Encourage high frequency (860-960MHz) frequency range of RFID.And by adjusting each parameters such as the rectangular box-like reflector patches 5 to bend inwards
Value, can excite circularly polarised wave, realize the circular polarisation of antenna.
In the present embodiment, which is 74.2mm × 74.2mm × 5mm, all more much smaller than existing antenna.Specific ruler
Very little to have: two dielectric substrate thickness are 0.504mm, and rectangle frame patch 31 is positive the annulus of rectangle, and 31 outer of rectangle frame patch is every
Side length is 72mm, it is interior along every side length be 62mm；The trace width of 3dB electric bridge 33 is respectively 0.58mm, 1.1mm.The ruler of earth plate 4
Very little is 35mm × 35mm.5 width of reflector patch is 5mm, and the length to bend inwards is 10.7mm.Sky between two layers of medium substrate
Gas-bearing formation 6 is 5mm high.
Fig. 9 show the simulation result of the reflection coefficient S (1,1) of miniaturization directed radiation MIMO reader antenna, Freq
Indicate frequency；Figure 10 show Circular polarization ratio (the Axial Ratio of miniaturization directed radiation MIMO reader antenna
Value) the wide simulation result of band；Figure 11 show miniaturization directed radiation MIMO reader antenna the face XOZ directional diagram；Figure
12 show isolation S (2,1) curve between miniaturization directed radiation MIMO reader antenna port.
Claims (9)
1. a kind of miniaturization directed radiation MIMO reader antenna for RFID, which is characterized in that including first medium substrate,
Second medium substrate, radiation patch, earth plate and reflector patch are divided on the first medium substrate and second medium substrate
It sets, the radiation patch is printed on the upper surface of first medium substrate, including rectangle frame patch, four T shape minor matters and 3dB electricity
Bridge, four T shape minor matters center symmetric settings, the vertical edge of each T shape minor matters are connected respectively a side of rectangle frame patch, and
The horizontal edge of T shape minor matters is located in rectangle frame patch, and the 3dB electric bridge is set to rectangle frame patch along the diagonal line of rectangle frame patch
At center, two input ports of 3dB electric bridge are connected with the respective side of adjacent rectangle frame patch respectively, 3dB electric bridge
For two output ports as feeding point, the earth plate is printed on the lower surface of first medium substrate, the reflector patch print
System is in the upper surface of second medium substrate.
2. a kind of miniaturization directed radiation MIMO reader antenna for RFID according to claim 1, feature exist
In at a quarter of a side that the vertical edge of each T shape minor matters is connected respectively rectangle frame patch.
3. a kind of miniaturization directed radiation MIMO reader antenna for RFID according to claim 1, feature exist
In the horizontal edge of each T shape minor matters is parallel with the respective side of rectangle frame patch respectively.
4. a kind of miniaturization directed radiation MIMO reader antenna for RFID according to claim 1, feature exist
In the size of four T shape minor matters is identical.
5. a kind of miniaturization directed radiation MIMO reader antenna for RFID according to claim 1, feature exist
In the earth plate includes rectangular patch and two F shape minor matters, and the rectangular patch is located in the lower surface of first medium substrate
At the heart, two F type minor matters, which correspond, to be located close on the outside of the side of the rectangular patch of two feeding points, each F shape minor matters
Two horizontal edges are connected with the respective side of rectangular patch, and the top of two F shape minor matters is towards the same of rectangular patch
Right angle.
6. a kind of miniaturization directed radiation MIMO reader antenna for RFID according to claim 5, feature exist
In the vertical edge of each F type minor matters is parallel with the respective side of rectangular patch respectively.
7. a kind of miniaturization directed radiation MIMO reader antenna for RFID according to claim 5, feature exist
In the size of described two F shape minor matters is identical.
8. a kind of miniaturization directed radiation MIMO reader antenna for RFID according to claim 1, feature exist
In, the reflector patch rectangular frame-shaped, and each middle side edge of reflector patch concaves.
9. a kind of miniaturization directed radiation MIMO reader antenna for RFID according to claim 1, feature exist
In, between the first medium substrate and second medium substrate be air layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820854143.2U CN208299032U (en) | 2018-06-04 | 2018-06-04 | A kind of miniaturization directed radiation MIMO reader antenna for RFID |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820854143.2U CN208299032U (en) | 2018-06-04 | 2018-06-04 | A kind of miniaturization directed radiation MIMO reader antenna for RFID |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208299032U true CN208299032U (en) | 2018-12-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820854143.2U Withdrawn - After Issue CN208299032U (en) | 2018-06-04 | 2018-06-04 | A kind of miniaturization directed radiation MIMO reader antenna for RFID |
Country Status (1)
| Country | Link |
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| CN (1) | CN208299032U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521014A (en) * | 2018-06-04 | 2018-09-11 | 福州大学 | A kind of miniaturization MIMO reader antennas and terminal applied to RFID |
| CN112310609A (en) * | 2020-11-25 | 2021-02-02 | 福州大学 | Low-profile wide-beam circularly polarized reader antenna applied to RFID |
-
2018
- 2018-06-04 CN CN201820854143.2U patent/CN208299032U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108521014A (en) * | 2018-06-04 | 2018-09-11 | 福州大学 | A kind of miniaturization MIMO reader antennas and terminal applied to RFID |
| CN112310609A (en) * | 2020-11-25 | 2021-02-02 | 福州大学 | Low-profile wide-beam circularly polarized reader antenna applied to RFID |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20181228 Effective date of abandoning: 20230728 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20181228 Effective date of abandoning: 20230728 |