CN108461911A - A kind of hyperfrequency near field RFED antenna and hyperfrequency near field RFID reader - Google Patents
A kind of hyperfrequency near field RFED antenna and hyperfrequency near field RFID reader Download PDFInfo
- Publication number
- CN108461911A CN108461911A CN201710090746.XA CN201710090746A CN108461911A CN 108461911 A CN108461911 A CN 108461911A CN 201710090746 A CN201710090746 A CN 201710090746A CN 108461911 A CN108461911 A CN 108461911A
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- antenna
- radiation patch
- near field
- hyperfrequency
- dielectric layer
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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
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
-
- 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
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2216—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in interrogator/reader equipment
-
- 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
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2225—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in active tags, i.e. provided with its own power source or in passive tags, i.e. deriving power from RF signal
-
- 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
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
Landscapes
- Waveguide Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a kind of hyperfrequency near field RFED antenna and hyperfrequency near field RFID readers, including first medium layer, second dielectric layer and multiple short-circuit columns, floor copper clad layers are set between first medium layer and second dielectric layer, first medium layer is set there are two microstrip power divider, each microstrip power divider includes that orthogonal feed is carried out between two output arms and two output arms, and each output arm is connected with one end of a short-circuit column respectively；Floor copper clad layers be equipped with for short-circuit column by via；Second dielectric layer, which is set, to be connected there are two the first radiation patch and at least one the second radiation patch coupled with the first radiation patch, the other end of short-circuit column with the first radiation patch.The present invention can effectively extend the bore of antenna, and then be effectively reduced the size of antenna.
Description
Technical field
The present invention relates to radio frequency identification (Radio Frequency Identification, abbreviation RFID) technical field,
More particularly to a kind of hyperfrequency near field RFED antenna and hyperfrequency near field RFID reader.
Background technology
Radio frequency identification be it is a kind of carrying out contactless bidirectional data communication by wireless radio frequency mode, to adding to target
With the technology of identification.Radio-frequency recognition system is generally made of reader (Reader) and electronic tag (Tag).RFID system passes through
Antenna come realize transmitting, receive electromagnetic wave, to realize identification of the reader to electronic tag.
RFID system operates mainly in low frequency (LF), high frequency (HF), hyperfrequency (UHF) and microwave frequency band.Low frequency and high frequency
RFID system is completed to identify by way of inductive coupling, be read apart from close.And hyperfrequency and microwave RFID systems pass through electromagnetism
The mode that wave transmits is completed to identify, be read apart from farther out.Usual near field RFED antenna is operated in HF frequency ranges, and such antenna passes through close
Field couples to activate label, however due to the limitation of its working frequency, the size of such antenna is relative to higher frequency range such as UHF frequencies
It is all bigger for section antenna, and the reading distance of antenna be also limited by the reading manner of near-field coupling will not be too far.And it is normal
The far field antenna seen is generally operational in uhf band, and the size of antenna is smaller, but such antenna is activated using radiation energy
Label is suitable for remote read-write；Gain generally all very little, can not be suitable near field read-write in the near field radiation area of antenna
Using.
Hyperfrequency near field RFED antenna has obtained many researchs in recent years, has devised various based on segmented couples annular day
Line, left-handed material load loop aerial, lumped capacity load the loop aerial etc. of phase compensation.These antenna common feature is
Using some way so that the electric current on ring keeps same phase, can thus be induced in annular region stronger more uniform
Magnetic field, but present these antenna volume is larger, is difficult in the Mobile portable handheld device of low-power consumption.
Invention content
In order to solve the above technical problem, the present invention provides a kind of hyperfrequency near field RFED antenna and hyperfrequency near fields
RFID reader can solve the problems, such as that existing hyperfrequency near field RFED antenna volume is larger.
In order to reach the object of the invention, what the technical solution of the embodiment of the present invention was realized in：
An embodiment of the present invention provides a kind of hyperfrequency near field RFED antenna, including first medium layer, second dielectric layer and
Multiple short circuit columns, are arranged floor copper clad layers between the first medium layer and second dielectric layer, wherein
It is set on the first medium layer there are two microstrip power divider, each microstrip power divider includes two output arms and two
Orthogonal feed is carried out between a output arm, each output arm is connected with one end of a short-circuit column respectively；
The floor copper clad layers are equipped with for the via across short-circuit column；
It is set in the second dielectric layer there are two the first radiation patch and at least one is coupled with the first radiation patch
The other end of second radiation patch, the short circuit column is connected with the first radiation patch.
Further, first radiation patch is the L-shaped structure for including two minor matters, and described two minor matters length can
It adjusts and is mutually perpendicular to.
Further, by adjusting the copper foil length on described two minor matters surfaces, the length of described two minor matters is adjusted.
Further, two output arms of the microstrip power divider are symmetrical curvilinear structures.
Further, the microstrip power divider is " E " type or " W " type structure.
Further, by adjusting the copper foil length on described two output arm surfaces, the length of described two output arms is adjusted
Degree difference is the 1/4 of antenna operating wavelength.
Further, second radiation patch is loop configuration.
Further, by adjust second radiation patch surface copper foil width and first radiation patch and
Purely resistive is presented in spacing between second radiation patch, the impedance operator for adjusting the antenna.
Further, the first medium layer and second dielectric layer are polytetrafluoroethylene (PTFE) epoxy resin medium plate.
The embodiment of the present invention additionally provides a kind of hyperfrequency near field RFID reader, includes the hyperfrequency of any description above
Near field RFED antenna.
Technical scheme of the present invention has the advantages that：
Hyperfrequency near field RFED antenna and hyperfrequency near field RFID reader provided by the invention, passes through microstrip power divider
Two output arms carry out orthogonal feed, are generated after the first radiation patch of the electromagnetic wave arrival second dielectric layer after short-circuit column
Then circularly polarised wave is coupled in the second radiation patch and is radiated, the bore for the antenna that extended, to effectively reduce antenna
Size；
Further, the first radiation patch is that two minor matters length are adjustable and orthogonal L-shaped structure, passes through adjusting
The length of two minor matters, the electromagnetic wave for reaching two minor matters will produce 90 degree of phase shifts, encouraged again in the first radiation patch again
Circularly polarised wave is played, so that the bandwidth of operation of antenna is wider, Circular polarization ratio is more preferable.
Description of the drawings
Attached drawing described herein is used to provide further understanding of the present invention, and is constituted part of this application, this hair
Bright illustrative embodiments and their description are not constituted improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is the vertical view of the hyperfrequency near field RFED antenna of the embodiment of the present invention；
Fig. 2 is the side view of the hyperfrequency near field RFED antenna of the embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the first medium layer of the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of the floor copper-clad of the embodiment of the present invention；
Fig. 5 is the structural schematic diagram of the second dielectric layer of the embodiment of the present invention.
Wherein：L1, L2 are the first radiation patch；1A, 1B are microstrip power divider；2 be the second radiation patch；3A、3B、3C、
3D is short-circuit column；4 be feed port；5 be floor copper-clad；6A is first medium layer；6B is second dielectric layer.
Specific implementation mode
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing to the present invention
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature mutually can arbitrarily combine.
An embodiment of the present invention provides a kind of hyperfrequency near field RFED antenna, including first medium layer, second dielectric layer and
Multiple short circuit columns, are arranged floor copper clad layers between the first medium layer and second dielectric layer, wherein
It is set on the first medium layer there are two microstrip power divider, each microstrip power divider includes two output arms and two
Orthogonal feed is carried out between a output arm, each output arm is connected with one end of a short-circuit column；
The floor copper clad layers be equipped with for short-circuit column by via；
It is set in the second dielectric layer there are two the first radiation patch and at least one is coupled with the first radiation patch
The other end of second radiation patch, the short circuit column is connected with the first radiation patch.
Further, first radiation patch is the L-shaped structure for including two minor matters, and described two minor matters length can
It adjusts and is mutually perpendicular to.
Specifically, by adjusting the copper foil length on described two minor matters surfaces, the length of described two minor matters is adjusted.When
Two minor matters of one radiation patch are isometric and when being mutually perpendicular to, the electromagnetic wave for reaching two minor matters generates 90 degree of phase shifts, generates circle
Polarized wave.
Further, the microstrip power divider is " E " type or " W " type structure.
It is worth noting that the structure of microstrip power divider of the invention can select the arbitrary knot for including two output arms
Structure, two output arms can be straight line, or symmetrical curvilinear structures.
Further, by adjusting the copper foil length on described two output arm surfaces, the length of described two output arms is adjusted
Degree difference is the 1/4 of antenna operating wavelength.When the length difference of two output arms of the microstrip power divider is antenna operating wavelength
When 1/4, the electromagnetic wave for reaching two on output arm short-circuit columns generates 90 degree of phase shifts, to generate circularly polarised wave.
Further, second radiation patch is loop configuration.It is loop configuration by the way that the second radiation patch is arranged, prolongs
The bore for having opened up antenna, to reduce the size of antenna.
Further, the copper foil width and the first spoke that the impedance operator of the antenna passes through the second radiation patch surface of adjusting
The spacing penetrated between patch and the second radiation patch is realized, when their spacing reaches certain value, the impedance operator of antenna
In purely resistive, to broaden the bandwidth of antenna.
Further, polytetrafluoroethylene (PTFE) (FR-4) epoxy resin Jie may be used in the first medium layer and second dielectric layer
Scutum.
The hyperfrequency near field RFED antenna of the present invention, circular polarisation and wide-band are combined, hyperfrequency near field is completely covered,
And axis is than easy to control, and antenna structure is simple, has the characteristics that low section, light-weight, small.
The embodiment of the present invention additionally provides a kind of hyperfrequency near field RFID reader, includes the hyperfrequency of any description above
Near field RFED antenna.
Embodiment one
Embodiments herein is illustrated below in conjunction with the accompanying drawings, as depicted in figs. 1 and 2, one kind according to the present invention
Hyperfrequency near field RFED antenna, including first medium layer 6A and second dielectric layer 6B, the side of first medium layer 6A are provided with feedback
Electric port 4 and two " E " types microstrip power divider 1A and 1B are respectively equipped with two on the output arm end of microstrip power divider 1A and 1B
A short circuit column 3A, 3B, 3C and 3D；Floor copper clad layers 5, floor copper clad layers are set between first medium layer 6A and second dielectric layer 6B
5 are equipped with 4 vias for being used for shoot through column, are directly grounded to avoid short-circuit column；The other side of second dielectric layer 6B is arranged
There are two first radiation patch L1, L2 of " L " type and the second radiation patch 2 of loop configuration.
Wherein, feed port 4 can select 100 ohm of impedance to feed, each output arm of microstrip power divider 1A and 1B
The microstrip transmission line in 50 Europe can be selected, the output arm surface is covered with copper foil, and the length of each output arm is defeated by adjusting
The copper foil for going out arm surface is adjusted.When two output arm length differences difference of each microstrip power divider is quarter-wave
When, the electromagnetic wave for reaching short-circuit column 3A, 3C generates 90 degree of phase shifts, and the electromagnetic wave for reaching short-circuit column 3B, 3D also generates 90 degree of phase shifts,
To generate circularly polarised wave；In addition, two minor matters vertical distributions of the first radiation patch L1, L2, and 90 degree of phase shifts are will produce, then
It is secondary that circularly polarised wave, two minor matters surfaces of the first radiation patch L1, L2 has been encouraged to be covered with copper foil, by adjusting two minor matters surfaces
Copper foil be adjusted, to adjust the axis ratio of circularly polarised wave, and then realize 3dB axis ratios；First radiation patch couples electromagnetic wave
It is radiated on to the second radiation patch 2.Microstrip power divider, the first radiation patch and the second radiation patch three length and
A quarter operation wavelength corresponding to working frequency equal to hyperfrequency near field RFED antenna, when the work frequency that antenna is determined
After rate, microstrip power divider, the first radiation patch and the second radiation that antenna can be calculated according to the operation wavelength of antenna are pasted
The length of piece, then best result is obtained by Optimization Debugging.Second radiation patch surface is covered with copper foil, fixes the second radiation patch
When piece, the impedance operator of antenna can by increasing and decreasing the copper foil on the second radiation patch surface, and then adjust the first radiation patch and
Spacing between second radiation patch is adjusted, and the spacing is smaller, and capacitance characteristic is stronger, adjusts the coupling electricity that spacing obtains
When holding suitable with the inductance that the second radiation patch, the first radiation patch generate, the impedance operator of antenna is exactly a pure resistance, to
The bandwidth of antenna is broadened.When the impedance of antenna is constant, the imaginary part of antenna can be with the length and width of the first radiation patch
The variation of degree and change, the longer first radiation patch the wider, and the imaginary part inductance of antenna is bigger.
Embodiment two
The structure of antenna is emulated by existing Microwave simulation software, the size at each position of antenna is calculated
Numerical value, makings is processed according to the numerical value for calculating gained, after the completion of processing and fabricating, two of adjusting microstrip power divider respectively
Length, width and the first spoke of the copper foil of output arm, two minor matters of the first radiation patch and the second radiation patch surface
Penetrate the spacing between patch and the second radiation patch.
With reference to figure 1 and Fig. 2, disclosed a kind of hyperfrequency near field RFED antenna according to embodiments of the present invention, first medium layer
The material of 6A and second dielectric layer 6B substrates can select FR-4 epoxy resin, dielectric constant 4.4, each medium laminar substrate thickness
Degree is 1.2mm, and the overall dimensions of antenna are 15mm*10mm, and the length of " E " type microstrip power divider is 12mm, and " L " type first radiates
The length of patch is 5mm, and the length of the second radiation patch is 22mm, width 2.2mm.The feed port of the antenna is 100 Europe
Nurse resistance, feeder line width are 0.5mm, and the antenna size of the present embodiment is smaller, is realized under the premise of not reducing antenna performance
The miniaturization of antenna.It is 0.2mm by the spacing adjusted between the second radiation patch and the first radiation patch, the impedance of antenna is special
Property be in purely resistive, to broaden the bandwidth of antenna, the working frequency range of antenna can be from 860MHz to 960MHz, impedance bandwidth
For 100MHz, international ultra-high frequency band (866~956MHz) is completely covered；The two of the first radiation patch L1 and L2 are adjusted respectively
A brachium, when two brachiums are 2.5mm, antenna is circular polarized antenna, and axis ratio is 3dB.
Embodiment three
The hyperfrequency near field RFED antenna of the present invention can be used for retail business, pharmaceutical sector, library's frame management, file cabinet pipe
The fields such as reason, shelf management and valuables tracking.
For example, being applied when library's frame manages, by the hyperfrequency near field RFED antenna combination radio frequency interface module
With Logic control module three parts constitute reader, for library Collections it is labelled be used for track the state of document with
And location information etc. can send information, to read under the induction of reader from trend reader so without human intervention
The information of tag memory storage.
Using the hyperfrequency near field RFED antenna of the present invention, recognizable swiftly passing object can simultaneously identify multiple simultaneously
RFID tag is read apart from farther, safety higher, and anti-interference ability is stronger.
Hyperfrequency near field RFED antenna using the present invention has following distinguishing feature：
1) RFID antenna is read apart from remote, coverage area is big when using；
2) hyperfrequency near field is completely covered in the antenna；
3) band of the antenna is wide, is disturbed small；
4) effect evenly, it is more preferable to be read in the magnetic field of the traditional near field antenna of the antenna ratio；
5) the antenna plane structure, small, antenna axis are than controllable, at low cost, installation is simple etc..
One of ordinary skill in the art will appreciate that all or part of step in the above method can be complete by software optimization
At.Optionally, all or part of step of above-described embodiment can also be realized using one or more integrated circuits, accordingly
Ground, the form that hardware may be used in each module/unit in above-described embodiment are realized.The present invention is not limited to any particular forms
Hardware and software combination.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, any made by repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of hyperfrequency near field RFED antenna, including first medium layer, second dielectric layer and multiple short-circuit columns, described first is situated between
Floor copper clad layers are set between matter layer and second dielectric layer, which is characterized in that wherein,
Microstrip power divider there are two being set on the first medium layer, each microstrip power divider includes two output arms and two defeated
Go out between arm and carry out orthogonal feed, each output arm is connected with one end of a short-circuit column respectively；
The floor copper clad layers are equipped with for the via across short-circuit column；
First radiation patch and at least one second coupled with the first radiation patch there are two being set in the second dielectric layer
The other end of radiation patch, the short circuit column is connected with the first radiation patch.
2. antenna according to claim 1, which is characterized in that first radiation patch is " L " for including two minor matters
Type structure, described two minor matters length are adjustable and are mutually perpendicular to.
3. antenna according to claim 2, which is characterized in that by adjusting the copper foil length on described two minor matters surfaces,
Adjust the length of described two minor matters.
4. antenna according to claim 1, which is characterized in that two output arms of the microstrip power divider are symmetrical bent
Cable architecture.
5. antenna according to claim 1, which is characterized in that the microstrip power divider is " E " type or " W " type structure.
6. antenna according to claim 1, which is characterized in that long by the copper foil for adjusting described two output arm surfaces
Degree, the length difference for adjusting described two output arms are the 1/4 of antenna operating wavelength.
7. antenna according to claim 1, which is characterized in that second radiation patch is loop configuration.
8. antenna according to claim 1, which is characterized in that wide by the copper foil for adjusting second radiation patch surface
Pure resistance is presented in degree and the spacing between first radiation patch and the second radiation patch, the impedance operator for adjusting the antenna
Property.
9. antenna according to claim 1, which is characterized in that the first medium layer and second dielectric layer are polytetrafluoroethyl-ne
Alkene epoxy resin medium plate.
10. a kind of hyperfrequency near field RFID reader, which is characterized in that close including any hyperfrequency of claim 1 to 9
Field RFID antenna.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710090746.XA CN108461911A (en) | 2017-02-20 | 2017-02-20 | A kind of hyperfrequency near field RFED antenna and hyperfrequency near field RFID reader |
| PCT/CN2017/120359 WO2018149248A1 (en) | 2017-02-20 | 2017-12-29 | Ultra-high-frequency near-field rfid antenna and ultra-high-frequency near-field rfid reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710090746.XA CN108461911A (en) | 2017-02-20 | 2017-02-20 | A kind of hyperfrequency near field RFED antenna and hyperfrequency near field RFID reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108461911A true CN108461911A (en) | 2018-08-28 |
Family
ID=63170505
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710090746.XA Pending CN108461911A (en) | 2017-02-20 | 2017-02-20 | A kind of hyperfrequency near field RFED antenna and hyperfrequency near field RFID reader |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108461911A (en) |
| WO (1) | WO2018149248A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111129748A (en) * | 2018-10-30 | 2020-05-08 | 天津大学青岛海洋技术研究院 | Dual-frequency antenna based on loading inductance technology |
| CN114914682A (en) * | 2022-07-11 | 2022-08-16 | 上海英内物联网科技股份有限公司 | Fold line-shaped microstrip near-field antenna used in closed metal cavity environment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103490151B (en) * | 2013-08-30 | 2015-08-26 | 大连海事大学 | A kind of L-waveband broadband circular polarization micro-strip antenna |
| CN103531895B (en) * | 2013-09-29 | 2017-01-11 | 华侨大学 | Novel broadband printed dipole antenna with branch wire integrated with feed balun |
| CN104821431A (en) * | 2015-05-06 | 2015-08-05 | 江苏军一物联网股份有限公司 | Three-dimensional antenna for ultrahigh-frequency RFID |
-
2017
- 2017-02-20 CN CN201710090746.XA patent/CN108461911A/en active Pending
- 2017-12-29 WO PCT/CN2017/120359 patent/WO2018149248A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111129748A (en) * | 2018-10-30 | 2020-05-08 | 天津大学青岛海洋技术研究院 | Dual-frequency antenna based on loading inductance technology |
| CN114914682A (en) * | 2022-07-11 | 2022-08-16 | 上海英内物联网科技股份有限公司 | Fold line-shaped microstrip near-field antenna used in closed metal cavity environment |
| CN114914682B (en) * | 2022-07-11 | 2022-11-01 | 上海英内物联网科技股份有限公司 | Fold line-shaped microstrip near-field antenna used in closed metal cavity environment |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018149248A1 (en) | 2018-08-23 |
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Application publication date: 20180828 |