CN109921183A - A kind of frequency read/write antenna structure - Google Patents
A kind of frequency read/write antenna structure Download PDFInfo
- Publication number
- CN109921183A CN109921183A CN201910073435.1A CN201910073435A CN109921183A CN 109921183 A CN109921183 A CN 109921183A CN 201910073435 A CN201910073435 A CN 201910073435A CN 109921183 A CN109921183 A CN 109921183A
- Authority
- CN
- China
- Prior art keywords
- transmission line
- microstrip transmission
- antenna structure
- frequency read
- dielectric
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
The invention discloses a kind of frequency read/write antenna structures, are related to radio frequency identification reader antenna technical field, including transport part, and the transport part includes: dielectric-slab；Metal, the bottom of the dielectric-slab is set；The top of the dielectric-slab is arranged in first microstrip transmission line；Complementary open-loop resonator: being arranged in the metal ground surface, and is located at the corresponding metal of the first microstrip transmission line electric current smallest point and is located in.The present invention is located in the complementary open-loop resonator structure of load by metal, strengthen the electric current at microstrip transmission line electric current smallest point, to increase the magnetic field strength at microstrip transmission line electric current smallest point, it greatly reduces and reads the probability that cavity generates, the stability for strengthening frequency read/write work, improves the using effect of frequency read/write.
Description
Technical field
The present invention relates to radio frequency identification reader antenna technical fields, particularly relate to a kind of frequency read/write antenna structure.
Background technique
Radio frequency identification (Radio Frequency Identification) is a kind of non-contacting automatic identification technology.It
Mainly by Space Coupling, i.e. alternating magnetic field or electromagnetic field carries out information exchange to achieve the purpose that identify label.
Radio-frequency recognition system is generally made of reader and electronic tag.Reader is generally by RFID radio-frequency module, control
Unit and reading and writing device antenna composition.Compared to traditional identification technology, RFID technique have small in size, label shape it is variable,
Contamination resistance is strong, it is reusable, identify that quantity is more, the identification distance advantages such as far simultaneously.In RFID system, antenna is provided
The platform of information exchange between label and reader completes the data transmitting between label and reader.Therefore, reader day
The performance of line determines the performance of RFID system.
Microstrip transmission line structure is formed by reading and writing device antenna, although structure is simple, it is convenient to realize, works as antenna area
When very big, will occur reading cavity because magnetic field dies down between microstrip transmission line, influence the normal work of frequency read/write.
Summary of the invention
In view of this, it is an object of the invention to propose a kind of frequency read/write antenna structure, for promoting radio frequency read-write
Stability when device works.
A kind of frequency read/write antenna structure, including transport part, the transport part include:
Dielectric-slab；
Metal, the bottom of the dielectric-slab is set；
The top of the dielectric-slab is arranged in first microstrip transmission line；
Complementary open-loop resonator, setting are located at the first microstrip transmission line electric current smallest point in the metal ground
The corresponding metal is located in.
Optionally, the antenna structure further includes the second microstrip transmission line, the transport part further include with it is described second micro-
With the power divider that transmission line one end is fixedly connected, a port of the power divider is fixedly connected with delay unit,
Another port is fixedly connected with third microstrip transmission line, and one end of the delay unit and first microstrip transmission line is fixed
Connection, the delay unit for changing two ports of the power divider output current and phase difference.
Optionally, the power divider include the 4th microstrip transmission line, described 4th microstrip transmission line one end with it is described
Second microstrip transmission line is fixedly connected, the other end be equipped with the 5th microstrip transmission line, the 5th microstrip transmission line set there are two end
Mouthful, one of port is fixedly connected with the delay unit, another port is fixedly connected with the third microstrip transmission line.
Optionally, the end of first microstrip transmission line and the third microstrip transmission line is equipped with matched load.
Optionally, the length of the delay unit is unrestricted for the integral multiple and shape of electromagnetic wave half-wavelength.
Optionally, the complementary open-loop resonator any amount is one group, first microstrip transmission line and the third
Three groups of complementation open-loop resonators are respectively provided at microstrip transmission line.
Optionally, the antenna structure includes at least two transport parts being set side by side.
Optionally, complementary open-loop resonator is equipped between two adjacent transport parts.
Optionally, the thickness range of the dielectric-slab is 0-10mm, and dielectric-slab uses glass mat FR-4 material, relatively
Dielectric constant is 4.3, and the length range of first, second, third, fourth and fifth microstrip transmission line is 0-1000mm.
Optionally, the inner ring that the outer ring and radius that the complementary open-loop resonator is 13mm by radius are 7mm is nested to form,
The outer ring and inner ring are provided with the notch of 1mm.
From the above it can be seen that a kind of frequency read/write antenna structure provided by the invention has the advantages that
(1) present invention is located in the complementary open-loop resonator structure of load by metal, and it is minimum to strengthen microstrip transmission line electric current
Electric current at point greatly reduces reading cavity and generates to increase the magnetic field strength at microstrip transmission line electric current smallest point
Probability, strengthen the stability of frequency read/write work, improve the using effect of frequency read/write, simultaneously as magnetic field
Enhancing, improves the reading distance of RF tag.
(2) the invention proposes a kind of easy to process, large scale, low cost hyperfrequency near field read-write device antennas.
(3) present invention can increase or decrease length of transmission line or quantity and penetrate to reach change according to actual needs
The size of frequency reading and writing device antenna, to adapt to different application scenarios, antenna pattern has reconfigurability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram one of antenna structure of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of antenna structure of embodiment of the present invention complementation open-loop resonator；
Fig. 3 is the structural schematic diagram two of antenna structure of the embodiment of the present invention；
Fig. 4 is the structural schematic diagram of antenna structure of embodiment of the present invention power divider；
Fig. 5 is the reflection coefficient of antenna structure of the embodiment of the present invention and the change curve of frequency；
Fig. 6 is the Distribution of Magnetic Field figure in the face yoz of antenna structure of the embodiment of the present invention；
Fig. 7 is the Distribution of Magnetic Field figure in the face xoy of antenna structure of the embodiment of the present invention.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
A kind of frequency read/write antenna structure, including transport part, the transport part include: dielectric-slab；Metal, setting exists
The bottom of the dielectric-slab；The top of the dielectric-slab is arranged in first microstrip transmission line；Complementary open-loop resonator: setting exists
The metal ground surface, and be located at the corresponding metal of the first microstrip transmission line electric current smallest point and be located in.
Split ring resonator is a kind of special construction for constituting magnetic Meta Materials, and the center of the structure is overlapped, size is in sub- wave
Long left and right is mutually provided with notch in symmetrical position, magnetic conductivity can be improved in required centre frequency to enhance
Magnetic field.Complementary open-loop resonator is the complementary structure of split ring resonator, it is a kind of gap structure corroded on metal flat,
Opening resonance loop structure is cut out on the ground in metal, can also generate the effect in enhancing magnetic field.Opening resonance loop structure when by
Perpendicular to toroidal direction time-varying magnetic field and be parallel to anchor ring and along the time-varying electric field of ring opening direction motivate when, just can be most
Big degree generates resonance.And complementary open-loop resonator structure is worked as by the time-varying electric field perpendicular to toroidal direction and is parallel to anchor ring
And resonance can be utmostly generated along the excitation of the time-varying magnetic field of ring opening direction, the resonance utmostly generated strengthens micro-
With the electric current at transmission line choke smallest point, to increase the magnetic field strength at microstrip transmission line electric current smallest point, subtract significantly
Lack and read the probability that cavity generates, strengthened the stability of frequency read/write work, has improved the use effect of frequency read/write
Fruit, simultaneously as the enhancing in magnetic field, improves the reading distance of RF tag.Therefore complementary open-loop resonator structure more suitable for
Planar structure antenna.
As shown in Figure 1, as an embodiment of the present invention, a kind of frequency read/write antenna structure, including dielectric-slab 1,
The thickness range of dielectric-slab 1 is 0-10mm, optionally, dielectric-slab 1 with a thickness of 1.6mm, dielectric-slab 1 uses glass mat
FR-4 material, relative dielectric constant 4.3, loss angle tangent 0.02, the bottom of dielectric-slab 1 with being fixedly connected with metal 2.It can
Choosing, with metal 2 clamping or glued together of dielectric-slab 1, the top of dielectric-slab 1 is fixedly connected with the first microstrip transmission line 3,
Dielectric-slab 1 can be clamped or glued together with the first microstrip transmission line 3.The metal 2 surface be equipped with complementary open loop resonance
Device 4, complementary open-loop resonator 4 are a kind of in metal gap structures on 2 surfaces, specifically can by the method for corrosion at
Type, complementary open-loop resonator 4 with being located at the corresponding metal of the 3 electric current smallest point of the first microstrip transmission line at 2, open by complementation
4 structure of ring resonator can be but be not limited to the shapes such as circle, rectangle, hexagon, need to only meet resonance frequency.Complementary open loop is humorous
Vibration 4 structure of device is analogous to a resonance circuit, therefore it has a resonance frequency, and magnetic field reaches maximum at the resonance frequency.
As shown in Fig. 2, 42 nested shape of inner ring that outer ring 41 and radius that optional complementation open-loop resonator 4 is 13mm by radius are 7mm
At two annulus are provided with the notch 43 of 1mm, and 4 size of complementary open-loop resonator of such structure is suitable, and the resonance effect generated
Fruit is good.
Complementary open-loop resonator 4 generates resonance, the electric current at microstrip transmission line electric current smallest point is strengthened, to increase
Magnetic field strength at microstrip transmission line electric current smallest point greatly reduces and reads the probability that cavity generates, and strengthens radio frequency read-write
The stability of device work, improves the using effect of frequency read/write, simultaneously as the enhancing in magnetic field, improves RF tag
Read distance.
As shown in figure 3, the optional one embodiment of the present invention, the antenna structure further includes the second microstrip transmission line 5, the
Two microstrip transmission lines 5 are fixedly connected on the top of dielectric-slab 1, and the transport part further includes solid with 5 one end of the second microstrip transmission line
Surely the left end at 1 top of dielectric-slab is arranged in the power divider 6 connected, second microstrip transmission line 5 and power divider 6,
The a port of the power divider 6 is fixedly connected with delay unit 7, another port is fixedly connected with the transmission of third micro-strip
Line 8, the delay unit 7 are fixedly connected with one end of the first microstrip transmission line 3, and the delay unit 7 is for changing the function
The output current and phase difference of two ports of rate distributor 6.Optionally, the length of the delay unit 7 is electromagnetic wave half-wavelength
Integral multiple.The output current and phase difference of two ports of power divider 6 is increased by 180 ° by delay unit 7, so that micro-strip passes
Electric current constant amplitude in defeated line per adjacent two transmission lines is reversed, realizes the superposition in magnetic field between microstrip transmission line, so that the
Magnetic field strength between one microstrip transmission line 3 and third microstrip transmission line 8 greatly enhances, and further reduces reading cavity and generates
Probability, strengthen the stability of frequency read/write work, improve the using effect of frequency read/write, simultaneously as magnetic field
Enhancing, improves the reading distance of RF tag.
As shown in figure 4, the optional one embodiment of the present invention, the power divider 6 includes the 4th microstrip transmission line 61,
Described 4th microstrip transmission line, 61 one end is fixedly connected with the second microstrip transmission line 5, and the other end is equipped with the 5th microstrip transmission line 62,
5th microstrip transmission line 62 is set there are two port, and one of port is fixedly connected with delay unit 7, another port and
Third microstrip transmission line 8 is fixedly connected, and optional 4th microstrip transmission line 61 and the 5th microstrip transmission line 62 are arranged in medium
The top of plate 1.The length range of microstrip transmission line is 0-1000mm, and optionally, the length of the microstrip transmission line is 330mm,
The optional one embodiment of the present invention, the resistance value of optional second microstrip transmission line 5 are 50 ohm, and the 4th micro-strip passes
The resistance value of defeated line 61 is 100 ohm, and the resistance value of the 5th microstrip transmission line 62 is 70.7 ohm, and length is a quarter electromagnetism
Resistance value is so transformed to 50 ohm from 100 ohm by wave wavelength, and 50 ohm of port is transmitted by 100 ohm of the first micro-strip
Line 3 and third microstrip transmission line 8 are divided into 2 100 ohm of port respectively, realize the mean allocation of power.
The end of the optional one embodiment of the present invention, first microstrip transmission line 3 and third microstrip transmission line 8 is all provided with
There is matched load 9, optional matched load 9 is serially connected in the end of the first microstrip transmission line 3 and third microstrip transmission line 8, matching
Load 9 is arranged at the top of the dielectric-slab 1, and the resistance value of optional matched load 9 is 50 ohm, the first microstrip transmission line 3
With metal 2 it is connected after matched load 9 by metallic vias with third microstrip transmission line 8, realization impedance matching, so that the
The wave transmitted on one microstrip transmission line 3 and third microstrip transmission line 8 is traveling wave, so that antenna is travelling-wave aerial, traveling wave day
The reading and writing device antenna of cable architecture has the characteristics that read apart from remote, design is simple, stability is high.
The optional one embodiment of the present invention, the antenna structure include at least two transport parts being set side by side.So
So that microstrip transmission line is more, the quantity for increasing microstrip transmission line can increase the read range of antenna, improve antenna
Using effect.
The optional one embodiment of the present invention, complementation 4 any amount of open-loop resonator is one group, preferably, three
It is one group, three groups of complementation open-loop resonators 4 is equipped at each microstrip transmission line.As shown in figure 3, metal be loaded with 3 on 2 altogether ×
15 pairs (totally 45) complementary open-loop resonators 4, multiple complementation open-loop resonators 4 improve resonance effect, further enhance micro-
With the electric current at transmission line choke smallest point, to increase the magnetic field strength at microstrip transmission line electric current smallest point, subtract significantly
Lack and read the probability that cavity generates, strengthened the stability of frequency read/write work, has improved the use effect of frequency read/write
Fruit, simultaneously as the enhancing in magnetic field, improves the reading distance of RF tag.
The optional one embodiment of the present invention is equipped with complementary open-loop resonator 4 between two adjacent transport parts, such as
This enhances microstrip transmission line stiffness of coupling, to enhance the magnetic field strength between microstrip transmission line, it is empty further to eliminate magnetic field
Hole strengthens the stability of frequency read/write work, improves the using effect of frequency read/write.
Optionally, antenna size is 400mm × 200mm, is 60MHz (880MHz-940MHz), covering in -10dB bandwidth
All hyperfrequencies (UHF) RFID frequency range including China, as shown in Figure 5.A kind of RFID reader that large area is read
Magnetic field of the antenna structure on the face yoz in 920MHz is as shown in Figure 6；Magnetic field such as Fig. 7 institute as z=10mm, on the face xoy
Show；As can be seen from the figure the read-write range of the antenna near-field is 400mm × 200mm × 60mm.
It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under thinking of the invention, above embodiments
Or can also be combined between the technical characteristic in different embodiments, step can be realized with random order, and be existed such as
Many other variations of the upper different aspect of the invention, for simplicity, they are not provided in details.
The embodiment of the present invention be intended to cover fall into all such replacements within the broad range of appended claims,
Modifications and variations.Therefore, all within the spirits and principles of the present invention, any omission, modification, equivalent replacement, the improvement made
Deng should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of frequency read/write antenna structure, which is characterized in that including transport part, the transport part includes:
Dielectric-slab；
Metal, the bottom of the dielectric-slab is set；
The top of the dielectric-slab is arranged in first microstrip transmission line；
Complementary open-loop resonator, setting is in the metal ground, and it is corresponding to be located at the first microstrip transmission line electric current smallest point
The metal be located in.
2. a kind of frequency read/write antenna structure according to claim 1, which is characterized in that the antenna structure further includes
Second microstrip transmission line, the transport part further include the power divider being fixedly connected with second microstrip transmission line one end,
The a port of the power divider is fixedly connected with delay unit, another port is fixedly connected with the transmission of third micro-strip
Line, the delay unit are fixedly connected with one end of first microstrip transmission line, and the delay unit is for changing the function
The output current and phase difference of two ports of rate distributor.
3. a kind of frequency read/write antenna structure according to claim 2, which is characterized in that the power divider includes
4th microstrip transmission line, described 4th microstrip transmission line one end are fixedly connected with second microstrip transmission line, and the other end is equipped with
5th microstrip transmission line, the 5th microstrip transmission line are set there are two port, and one of port is fixed with the delay unit
Connection, another port is fixedly connected with the third microstrip transmission line.
4. a kind of frequency read/write antenna structure according to claim 3, which is characterized in that first microstrip transmission line
Matched load is equipped with the end of the third microstrip transmission line.
5. a kind of frequency read/write antenna structure according to claim 4, which is characterized in that the length of the delay unit
It is unrestricted for the integral multiple and shape of electromagnetic wave half-wavelength.
6. a kind of frequency read/write antenna structure according to claim 5, which is characterized in that the complementation open-loop resonator
Any amount is one group, is respectively provided with three groups of complementation open loop resonance at first microstrip transmission line and the third microstrip transmission line
Device.
7. a kind of frequency read/write antenna structure according to claim 6, which is characterized in that the antenna structure includes extremely
Few two transport parts being set side by side.
8. a kind of frequency read/write antenna structure according to claim 7, which is characterized in that two adjacent transmission
Complementary open-loop resonator is equipped between portion.
9. a kind of frequency read/write antenna structure according to claim 3, which is characterized in that the thickness model of the dielectric-slab
It enclosing for 0-10mm, dielectric-slab uses glass mat FR-4 material, relative dielectric constant 4.3, described first, second, third,
The length range of 4th and the 5th microstrip transmission line is 0-1000mm.
10. a kind of frequency read/write antenna structure according to claim 1, which is characterized in that the complementation open loop resonance
The inner ring that the outer ring and radius that device is 13mm by radius are 7mm is nested to form, and the outer ring and inner ring are provided with the notch of 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910073435.1A CN109921183B (en) | 2019-01-25 | 2019-01-25 | Radio frequency reader-writer antenna structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910073435.1A CN109921183B (en) | 2019-01-25 | 2019-01-25 | Radio frequency reader-writer antenna structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109921183A true CN109921183A (en) | 2019-06-21 |
| CN109921183B CN109921183B (en) | 2020-11-03 |
Family
ID=66960856
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910073435.1A Active CN109921183B (en) | 2019-01-25 | 2019-01-25 | Radio frequency reader-writer antenna structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109921183B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201378631Y (en) * | 2008-12-08 | 2010-01-06 | 成都九洲电子信息系统有限责任公司 | RFID directional antenna array |
| US20100026582A1 (en) * | 2008-08-04 | 2010-02-04 | Electronics And Telecommunications Research Institute | Near-field radio frequency identification reader antenna |
| US20140022140A1 (en) * | 2011-01-20 | 2014-01-23 | Siemens Aktiengesellschaft | Radio Frequency Identification Reader Antenna and Shelf |
| CN206850015U (en) * | 2017-04-01 | 2018-01-05 | 厦门致联科技有限公司 | A kind of work(for RFID system divides feeding network |
-
2019
- 2019-01-25 CN CN201910073435.1A patent/CN109921183B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100026582A1 (en) * | 2008-08-04 | 2010-02-04 | Electronics And Telecommunications Research Institute | Near-field radio frequency identification reader antenna |
| CN201378631Y (en) * | 2008-12-08 | 2010-01-06 | 成都九洲电子信息系统有限责任公司 | RFID directional antenna array |
| US20140022140A1 (en) * | 2011-01-20 | 2014-01-23 | Siemens Aktiengesellschaft | Radio Frequency Identification Reader Antenna and Shelf |
| CN206850015U (en) * | 2017-04-01 | 2018-01-05 | 厦门致联科技有限公司 | A kind of work(for RFID system divides feeding network |
Non-Patent Citations (3)
| Title |
|---|
| CAIXIA CUI等: "Design of A Novel UHF RFID Reader Antenna for Near-field Applications", 《2015 IEEE INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION & USNC/URSI NATIONAL RADIO SCIENCE MEETING》 * |
| JAYARAM KIZHEKKE PAKKATHILLAM等: "A Novel UHF Near-Field Reader Antenna Deploying CSRR Element", 《IEEE TRANSACTION ON ANTENNA AND PROPAGATION》 * |
| K.W.LAM等: "A Novel leaky wave antenna for the base station in an innovative indoors cellular mobile communication system", 《IEEE ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109921183B (en) | 2020-11-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7750813B2 (en) | Microstrip antenna for RFID device | |
| US8564439B2 (en) | Microstrip antenna for RFID device | |
| CN1953273B (en) | Tag antenna, tag and rfid system using the same | |
| CN103165988A (en) | Broadband circularly-polarized radio frequency identification (RFID) reader antenna | |
| CN202205889U (en) | Microwave frequency band RFID (Radio Frequency Identification Device) tag antenna applied to nonmetal surface | |
| CN108598667A (en) | A kind of compact wideband circular polarisation back cavity type RFID reader antenna | |
| CN101916907B (en) | Ultrahigh frequency band near field RFID reader-writer antenna | |
| US8884834B1 (en) | Antenna system with an antenna and a high-impedance backing | |
| CN102820531A (en) | RFID (radio frequency identification) tag antenna with compensation structure, RFID tag and system | |
| US11329697B2 (en) | Multi-layer electromagnetic coupler arrangement | |
| CN106374218A (en) | RFID (Radio Frequency Identification) near-field reader-writer antenna | |
| CN101527391A (en) | Plate-shaped feeding air-dielectric patch antenna | |
| US20090027285A1 (en) | Antenna device and radio communication system | |
| CN109066070A (en) | A kind of RFID reader antenna and its application method | |
| CN109921183A (en) | A kind of frequency read/write antenna structure | |
| CN108808247B (en) | Near field radio frequency identification antenna with electrically large size identification area | |
| CN102820535A (en) | Near-field radio frequency identification (RFID) reader plane opening dual-ring antenna for ultra high frequency (UHF) band | |
| CN203839507U (en) | Mini anti-metal UHF label antenna based on EBG structure | |
| CN202817177U (en) | Plane opening double-ring antenna of near-field RFID reader-writer used for UHF frequency range | |
| Ren et al. | A novel design for UHF near-field RFID reader antenna based on traveling wave | |
| CN111553453B (en) | Chip-free radio frequency identification electronic tag device based on defected ground structure | |
| US8022815B2 (en) | Magnetic RFID coupler with balanced signal configuration | |
| CN201758174U (en) | Ultra-high frequency range near field FRID reader-writer antenna | |
| CN108923111B (en) | UHF RFID near field reader antenna applied to liquid environment | |
| CN203085759U (en) | Complete planar anti-metal RFID ultrahigh frequency label antenna |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |