CN104916908B - Ultrahigh frequency broadband circular polarisation RFID reader antenna - Google Patents
Ultrahigh frequency broadband circular polarisation RFID reader antenna Download PDFInfo
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- CN104916908B CN104916908B CN201510272027.0A CN201510272027A CN104916908B CN 104916908 B CN104916908 B CN 104916908B CN 201510272027 A CN201510272027 A CN 201510272027A CN 104916908 B CN104916908 B CN 104916908B
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- patch
- bronze medal
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- antenna
- rfid reader
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Abstract
The invention discloses a kind of ultrahigh frequency broadband circular polarisation RFID reader antennas, including substrate, the substrate is square, the first bronze medal patch is printed in the upper surface of substrate, first bronze medal patch is square cyclic structure, in four vertex of the first bronze medal patch, identical rectangle the second bronze medal patch of four block sizes is diagonally inwardly each extended over out；The 3rd bronze medal patch of rectangle and the 4th bronze medal patch of inverted L shape are printed in the lower surface of substrate, one end of the 3rd bronze medal patch is located at the midpoint of a side of substrate, and the other end connects the 4th bronze medal patch.Inventive antenna has wide impedance bandwidth, and 10 dB impedance bandwidths are 772 1166 MHz；Antenna has wide axial ratio bandwidth, and the 3dB axial ratio bandwidths of maximum gain direction are 840 965 MHz, can cover America, Europe, Japan, China, India, South Korea, Singapore, Hong Kong, Taiwan, the ultrahigh frequency RFID working frequency range of Australia.
Description
Technical field
The invention belongs to antenna technologies and wireless communication field, are related to a kind of ultrahigh frequency broadband circular polarisation RFID reader day
Line.
Background technology
Radio frequency identification, that is, RFID（Radio Frequency Identification）Technology, available for marking articles and with
Track is a kind of contactless automatic identification technology.It is excellent since detection range is long, reading rate is fast and data transmission efficiency is high
Point, RFID technique is in hyperfrequency（UHF）There are many application of frequency range, and every country and the uhf band in area are different from, as in
State is 840 ~ 845 MHz and 920 ~ 925 MHz, and Europe is 866 ~ 869 MHz, and Australia is 920 ~ 926
MHz, Singapore are 866 ~ 869 MHz and 869 ~ 925 MHz, and the U.S. is 902 ~ 928 MHz, Japanese for 952
~ 955 MHz。
Important component of the RFID reader antenna as RFID system, its performance will greatly influence entire RFID
The efficiency and quality of system.Size of the principal element including antenna of influence RFID reader antenna, working frequency range, bandwidth, resistance
Anti-, gain and polarization mode.
The working frequency range of most of existing circular polarisation ultrahigh frequency RFID reader antennas is only capable of meeting Chinese Industrial Standards (CIS), the U.S.
One kind in the standards such as standard, European standard can not cover the working frequency range of all standards simultaneously.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of ultrahigh frequency broadband circular polarisation RFID reader
Antenna.
The purpose of the present invention is what is be achieved through the following technical solutions：A kind of ultrahigh frequency broadband circular polarisation RFID reader
Antenna, including substrate, the substrate is square, and the first bronze medal patch, the first bronze medal patch are printed in the upper surface of substrate
For square cyclic structure, in four vertex of the first bronze medal patch, four block sizes are diagonally inwardly each extended over out
Identical rectangle the second bronze medal patch；Print the 3rd bronze medal patch of rectangle and the 4th bronze medal patch of inverted L shape in the lower surface of substrate, described the
One end of three bronze medal patches is located at the midpoint of a side of substrate, and the other end connects the 4th bronze medal patch.When the length of the second bronze medal patch
When elongated, the resonant frequency of antenna decreases, and bandwidth of operation reduces therewith.
Further, a length of 80mm of inner edge of the first bronze medal patch, the length of the second bronze medal patch is 26.9mm；Inverted L shape
4th bronze medal patch a length of 20.9mm along the 3rd bronze medal patch direction, width 33.7mm, perpendicular to a length of of the 3rd bronze medal patch direction
16.6mm, width 13.3mm.
The beneficial effects of the invention are as follows：The RFID antenna size of the present invention is 100mm × 100mm × 1.5mm, be can be used for
In RFID reader.Antenna has wide impedance bandwidth, and -10 dB impedance bandwidths are 772-1166 MHz.Antenna has wide axis ratio
Bandwidth, the 3dB axial ratio bandwidths of maximum gain direction are 840-965 MHz, can cover America, Europe, Japan, China, print
Degree, South Korea, Singapore, Hong Kong, Taiwan, the ultrahigh frequency RFID working frequency range of Australia.
Description of the drawings
Fig. 1 is the overall structure top view of antenna；
Fig. 2 is the overall structure bottom view of antenna；
Fig. 3 is the emulation of impedance bandwidth of antenna and test result figure；
Fig. 4 is the emulation of antenna maximum gain direction axial ratio bandwidth and test result figure；
Fig. 5 is the emulation of antenna left-hand circular polarization gain and test result figure；
In figure, substrate 1, the first bronze medal patch 2, the second bronze medal patch 3, the 3rd bronze medal patch 4, the 4th bronze medal patch 5.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, 2, a kind of ultrahigh frequency broadband circular polarisation RFID reader antenna of the present invention, including substrate 1, the base
Bottom 1 is square, and the first bronze medal patch 2 is printed in the upper surface of substrate 1, and the first bronze medal patch 2 is square cyclic structure,
In four vertex of the first bronze medal patch 2, identical the second bronze medal of rectangle of four block sizes is diagonally inwardly each extended over out
Patch 3；The 3rd bronze medal patch 4 of rectangle and the 4th bronze medal patch 5 of inverted L shape are printed in the lower surface of substrate 1, the 3rd bronze medal patch 4
One end is located at the midpoint of a side of substrate 1, and the other end connects the 4th bronze medal patch 5.When the length of the second bronze medal patch, day
The resonant frequency of line decreases, and bandwidth of operation reduces therewith.
Embodiment
RFID reader antenna size is 100mm × 100mm × 1.5mm；The a length of 80mm of inner edge of first bronze medal patch 2, the
The length of two bronze medal patches 3 is 26.9mm；The 4th bronze medal patch 5 of inverted L shape is a length of along 50 the 3rd bronze medal patch of Ω microstrip lines, 4 direction
20.9mm, width 33.7mm, a length of 16.6mm perpendicular to 4 direction of the 3rd bronze medal patch, width 13.3mm.
The course of work of the present invention is as follows：The present invention is a kind of slot antenna.1 upper surface of substrate forms a slot without lying copper region
Shape radiator.The second bronze medal patch 3 is introduced, the perimeter of no lying copper region can be increased considerably, so as to reduce the resonance of slot antenna frequency
Rate, and then reduce the size of antenna.3rd bronze medal patch 4 of substrate lower surface is one 50 Ω microstrip lines, and the 4th bronze medal patch 5 is inverted L
Type feed structure.The micro-strip part of 50 external Ω microstrip lines or the inner wire of 50 Ω sub-miniature A connectors connect the 3rd bronze medal from side
Patch 4.The metal of 50 external Ω microstrip lines part or 50 Ω sub-miniature A connectors outer conductor from side connect the first bronze medal patch
Piece 2.Radiofrequency signal is fed to the 3rd bronze medal patch 4 via external 50 Ω microstrip lines or 50 Ω sub-miniature A connectors.3rd bronze medal patch 4
Signal is further transmitted to the 4th bronze medal patch 5.The energy of signal is fed to substrate by the 4th bronze medal patch 5 by couple feed
Upper surface.Energy is in upper surface without generating resonance, outside radiation signal in lying copper region.Since the 4th bronze medal patch 5 is inverted L shape knot
Structure can generate the orthogonal electric current of both direction, so that radiation field of aerial has orthogonal electric field component.Suitably
The length and width of 5 two arms of the 4th bronze medal patch are adjusted, the electric field of radiation can be made there are identical amplitude and 90 ° of phase differences, so as to
Generate circular polarization radiation.
The advantages of RFID reader antenna of the present invention, includes：
（1）At low cost and size is minimum.Antenna processes most basic material only with two kinds of antennas of FR4 and copper.Due to drawing
The second bronze medal patch 3 is entered, antenna size significantly reduces, and entire antenna size is 100mm × 100mm × 1.5mm, can with other
The circular polarisation RFID reader antenna for covering All Countries standard is smaller compared to size.
（2）Because larger for the more traditional stria antenna size of the size of slot, the bandwidth of antenna is than traditional stria antenna
Width, working frequency range can meet all ultrahigh frequency RFID frequency ranges simultaneously.
（3）840.5-955MHz band operations are good.Reflectance factor is respectively less than -10dB, the axis ratio band of maximum gain direction
Width is respectively less than 3dB, and left-hand circular polarization gain is more than 2.2 dBic.
The test input impedance of the antenna as shown in figure 3, measured impedance 772-1166MHz with 50 Ω impedance transfers
Lines matching is good.Antenna maximum gain direction axial ratio bandwidth test result as shown in figure 4, in 840-955MHz, axis ratio
Respectively less than 3dB.As shown in figure 5, in 840-955MHz, left-hand circular polarization gain is all higher than 2.2 for antenna left-hand circular polarization gain
dBic。
Above-described embodiment is available to those of ordinary skill in the art to realize or use the present invention, the common skill in this field
Art personnel can make above-described embodiment various modifications or variation without departing from the present invention in the case of the inventive idea, thus
Protection scope of the present invention is not limited by above-described embodiment, and should meet the inventive features that claims are mentioned
Maximum magnitude.
Claims (2)
1. a kind of ultrahigh frequency broadband circular polarisation RFID reader antenna, which is characterized in that including substrate（1）, the substrate（1）For
Square, in substrate（1）Upper surface be printed with the first bronze medal patch（2）, the first bronze medal patch（2）For square annular knot
Structure, in the first bronze medal patch（2）Four vertex, diagonally inwardly each extend over out the identical rectangle of four block sizes
Two bronze medal patches（3）；In substrate（1）Lower surface printing the 3rd bronze medal patch of rectangle（4）With the 4th bronze medal patch of inverted L shape（5）, described
Three bronze medal patches（4）One end be located at substrate（1）A side midpoint, as feed end, the other end connects the 4th bronze medal patch
（5）；When the second bronze medal patch（3）Length when, the resonant frequency of antenna decreases, and bandwidth of operation reduces therewith.
2. a kind of ultrahigh frequency broadband circular polarisation RFID reader antenna according to claim 1, which is characterized in that described first
Copper patch（2）The a length of 80mm of inner edge, the second bronze medal patch（3）Length be 26.9mm；The 4th bronze medal patch of inverted L shape（5）Along the 3rd
Copper patch（4）A length of 20.9mm in direction, width 33.7mm, perpendicular to the 3rd bronze medal patch（4）A length of 16.6mm in direction, width are
13.3mm。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510272027.0A CN104916908B (en) | 2015-03-11 | 2015-05-26 | Ultrahigh frequency broadband circular polarisation RFID reader antenna |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2015101070487 | 2015-03-11 | ||
| CN201510107048 | 2015-03-11 | ||
| CN201510272027.0A CN104916908B (en) | 2015-03-11 | 2015-05-26 | Ultrahigh frequency broadband circular polarisation RFID reader antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104916908A CN104916908A (en) | 2015-09-16 |
| CN104916908B true CN104916908B (en) | 2018-05-29 |
Family
ID=54085753
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510272027.0A Expired - Fee Related CN104916908B (en) | 2015-03-11 | 2015-05-26 | Ultrahigh frequency broadband circular polarisation RFID reader antenna |
Country Status (1)
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| CN (1) | CN104916908B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108054502A (en) * | 2017-11-30 | 2018-05-18 | 苏州优函信息科技有限公司 | Compact-type high-gain recognition circular polarization reader antenna and feeding network preparation method |
| CN108521014B (en) * | 2018-06-04 | 2023-07-28 | 福州大学 | Miniaturized MIMO reader antenna and terminal applied to RFID |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006124400A2 (en) * | 2005-05-13 | 2006-11-23 | University Of Pittsburgh - Of The Commonwealth System Of Higher Education | Method of making an electronic device using an electrically conductive polymer, and associated products |
| US20070279286A1 (en) * | 2006-06-05 | 2007-12-06 | Mark Iv Industries Corp. | Multi-Mode Antenna Array |
| KR100859714B1 (en) * | 2006-10-31 | 2008-09-23 | 한국전자통신연구원 | Tag antenna mountable on metallic objects using artificial magnetic conductorAMC for wireless identification and wireless identification system using the same tag antenna |
| CN203434283U (en) * | 2013-09-04 | 2014-02-12 | 中国计量学院 | Opening rectangular ring coplanar type ultra wide band microstrip antenna |
| CN103794863A (en) * | 2014-01-17 | 2014-05-14 | 浙江大学 | High-orientation RFID handheld reader antenna |
| CN204558640U (en) * | 2015-03-11 | 2015-08-12 | 浙江大学 | A kind of ultrahigh frequency broadband circular polarization RFID reader antenna |
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2015
- 2015-05-26 CN CN201510272027.0A patent/CN104916908B/en not_active Expired - Fee Related
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