CN109149092A - Compact list presents broadband circle polarized RFID reader antenna - Google Patents
Compact list presents broadband circle polarized RFID reader antenna Download PDFInfo
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- CN109149092A CN109149092A CN201810840531.XA CN201810840531A CN109149092A CN 109149092 A CN109149092 A CN 109149092A CN 201810840531 A CN201810840531 A CN 201810840531A CN 109149092 A CN109149092 A CN 109149092A
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- 230000005855 radiation Effects 0.000 claims abstract description 82
- 239000002184 metal Substances 0.000 claims abstract description 64
- 229910052751 metal Inorganic materials 0.000 claims abstract description 64
- 239000000758 substrate Substances 0.000 claims abstract description 40
- 230000003071 parasitic effect Effects 0.000 claims abstract description 24
- 230000010287 polarization Effects 0.000 claims abstract description 14
- 239000000523 sample Substances 0.000 claims description 10
- 239000004677 Nylon Substances 0.000 claims description 6
- 229920001778 nylon Polymers 0.000 claims description 6
- 230000024241 parasitism Effects 0.000 claims description 5
- 230000005284 excitation Effects 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 27
- 238000012360 testing method Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005388 cross polarization Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000002847 impedance measurement Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
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- 238000012545 processing Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- H01Q1/36—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
- H01Q1/12—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
- H01Q1/48—Earthing means; Earth screens; Counterpoises
-
- 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
Abstract
The invention discloses a kind of compact lists to present broadband circle polarized RFID reader antenna, including first layer primary radiation structure, second layer spurious radiation structure and ground plane structure；First layer primary radiation structure includes first medium substrate, and the half E type metal patch modified is etched in the upper surface of first medium substrate, etches oval groove and corner cut on half E type patch；Second layer spurious radiation structure includes second medium substrate, etches the parasitic metal patch for being cut out two an equal amount of angles in the top of second medium substrate；Ground plane structure includes four vertical metal plates and earth plate.The present invention is using the half E type metal patch modified as main radiating structure, it can generate circular polarization radiation, and there is wider impedance bandwidth, four vertical metal plates help to reduce the overall dimensions of antenna, spurious radiation structure can further enhance the circular polarisation bandwidth and impedance bandwidth of antenna, have the characteristics that size is small compared to other antennas, is suitable for smaller space environment.
Description
Technical field
The invention belongs to the technical fields of circular polarized antenna, are related to a kind of broadband circle polarized RFID reader of compact list feedback
Antenna.
Background technique
Recently as the quick emergence and development of Internet of Things industry, Radio Frequency Identification Technology (RFID) is in many various fields
In be applied to, such as wireless cash register system, the fields such as object tracking and automotive safety.Antenna is as important in RFID system
Component part is all the hot spot of people's research for a long time.For short distance RFID system, through frequently with high frequency near field RFID system
System, the 13.56MHz RFID system of such as less than 10cm are this often RFID reader together with antenna set.For needing
The RFID system to work at a distance, using work in uhf band or the RFID system of microwave frequency band.Long distance at present
Most widely used from the frequency range of work is uhf band RFID system, and antenna and reader often take separate structure, and lead to
The coaxial cable for crossing impedance matching links together reader and antenna.RFID system is due to structure, installation and use environment
Deng variation multiplicity, and reader product develops towards miniaturization even subminaturization, so that the design of reader antenna faces
New challenge.The placing direction of RFID tag is arbitrary in practical applications, and label antenna is usually linear polarization, is needed
The reader antenna of circular polarization radiation is wanted to guarantee the reliability communicated between reader and label.In addition, in most of reality
In the case of, there are higher demand, such as wider impedance bandwidth, axial ratio bandwidth to reader antenna, high antenna gain and fixed
To the symmetrical directional diagram of stabilization etc..The advantages of circular polarization microstrip antenna is due to compact-sized, low section, is easily integrated, warp
Often it is designed as RFID reader antenna.
Domestic and international researcher has done many researchs for circular polarisation RFID paster antenna at present, but in existing document
All bigger for the RFID recognition circular polarization reader antenna volume singly presented, this is primarily due to the side using stacked radiation patch
Formula or load matching minor matters go enhancing bandwidth.Single feedback circular polarisation RFID antenna bandwidth of operation of small size is all narrow, thus
Reduce the use scope of RFID system.If reader antenna will possess wider circular polarisation bandwidth under conditions of small size,
Antenna needs to introduce additional power splitter or coupler, i.e., using double-fed or the feeding classification more presented.It will increase day in this way
The complexity of linear system system, while also will increase the loss of antenna, reduce antenna radiation efficiency and gain.
Therefore, it is badly in need of designing a compact, is read using single feedback mode and the RFID with certain circular polarisation bandwidth
Device antenna, to meet current commercial and industrial needs.
Summary of the invention
The shortcomings that it is a primary object of the present invention to overcome the prior art and deficiency provide a kind of compact list feedback broadband circle
Polarize RFID reader antenna, is keeping size smaller, and under conditions of compact-sized, antenna has biggish impedance, circular polarisation
Bandwidth and higher circular polarized antenna gain.
In order to achieve the above object, the invention adopts the following technical scheme:
A kind of compact list of the present invention presents broadband circle polarized RFID reader antenna, including three-decker, the three-layered node
Structure is respectively first layer primary radiation structure, second layer spurious radiation structure and ground plane structure；The primary radiation structure includes the
One medium substrate etches the half E type metal patch modified, half E modified in the upper surface of first medium substrate
Type metal patch is to etch elliptical slot at the center of half E type metal patch, and corner cut is arranged in the position at a wherein angle, and
One section of minor matters is added in half E type metal patch, so that it is formed by paster antenna and generates circular polarization radiation；The second layer is parasitic
Irradiation structure includes second medium substrate, etches one in the top of second medium substrate and is cut out two an equal amount of angles
Parasitic metal patch；The ground plane structure includes four vertical metal plates and earth plate, and four vertical metal plates are rotations
Turn symmetrical, and the surrounding of earth plate is set, the vertical metal plate is connected with earth plate, and constituting a band, there are four lack
The metal cavity of mouth；The bottom of the earth plate is equipped with feed port, is equipped with SMA radio-frequency joint and SMA at the feed port
Feed probes；Equipped with antenna, the SMA radio-frequency joint with antenna is welded on for the lower section of the second layer spurious radiation structure
Together, SMA feed probes pass through second layer spurious radiation structure and feed directly to the half E type metal patch modified；Described
The square-shaped metal patch of two layers of spurious radiation structure etches a circular trough, for cutting off SMA feed probes and parasitism gold
Belong to patch contact, the second layer is generated by intercoupling between parasitic metal patch and the half E type metal patch modified
The excitation of spurious radiation structure.
The first medium substrate is square substrate as a preferred technical solution, and substrate side length is 140mm.As
Preferred technical solution, the long side of the half E type metal patch modified are 125mm, broadside 110mm；
The long axis of the elliptical slot is 27mm, short axle 18.9mm；
The length of the corner cut is 27mm.
The parasitic metal patch is clipped squares patch as a preferred technical solution,.
The clipped squares patch length is 122mm, length of corner cut 30mm as a preferred technical solution,.
The shape of the antenna ground plate is square as a preferred technical solution, side length 150mm.
The first layer primary radiation structure height is 1mm as a preferred technical solution,；
The height of the second layer spurious radiation structure is 1mm；
The distance of the first layer primary radiation structure and second layer spurious radiation structure is 8mm；
The second layer spurious radiation structure is 15mm at a distance from ground.
It as a preferred technical solution, further include for fixing first layer primary radiation structure, second layer spurious radiation structure
And the nylon column of ground plane structure, the nylon column install the surrounding of each layer structure.
It is 4.4 FR4 medium substrate that the first medium substrate, which selects dielectric constant, as a preferred technical solution, thick
Degree is 1mm.
It is 4.4 FR4 medium substrate that the second medium substrate, which selects dielectric constant, as a preferred technical solution, thick
Degree is 1mm.
Compared with the prior art, the invention has the following advantages and beneficial effects:
1, compact list of the invention presents half E type patch that broadband circle polarized RFID reader antenna will have been modified as master
Radiation patch, its own can generate circular polarization radiation, and have wider impedance bandwidth, compared to other paster antenna sheets
Body has the characteristics that patch size is small, is suitable for smaller space environment.
2, compact list of the invention is presented broadband circle polarized RFID reader antenna and is hung down using the load rotation of earth plate surrounding
Straight metal plate is combined with the half E type metal patch modified, and effectively reduces the work of the original half E type paster antenna modified
Working frequency is equivalent to the physical size for effectively reducing antenna.Therefore, the present invention can be in the size condition for not increasing antenna
Under, antenna is worked in the RFID frequency range of corresponding low-frequency range, more RFID system work are met.
3, compact list of the invention presents broadband circle polarized RFID reader antenna in improving circular polarization radiation performance,
Oval type groove and corner cut are loaded on the half E type metal patch modified, thus change the current disturbing on half E type metal patch,
The amplitude and phase of quadrature current in adjustment space, to improve circular polarization radiation purity and impedance bandwidth.
4, the circular polarisation bandwidth of the invention in order to further broaden antenna, is arranged near field below primary radiation patch
Parasitic radiation patch, so that the circular polarization pattern for having motivated another new increases under the altitudes for not increasing antenna
The impedance bandwidth and circular polarisation bandwidth of antenna.
5, there is antenna of the invention wide bandwidth of operation, compact-sized, low section, making material to make at low cost and processing
The less feature with assembly process has very strong practical value.
Detailed description of the invention
Fig. 1 is the schematic perspective view that compact list of the present invention presents broadband circle polarized RFID reader antenna；
Fig. 2 is the top view that compact list shown in Fig. 1 presents broadband circle polarized RFID reader antenna；
Fig. 3 is the side view that compact list shown in Fig. 1 presents broadband circle polarized RFID reader antenna；
Fig. 4 is the second layer spurious radiation structure that compact list shown in Fig. 1 presents broadband circle polarized RFID reader antenna
Schematic diagram；
Fig. 5 is the single feedback circularly-polarized patch antenna 1 for being not loaded near field parasitic patch；
Fig. 6 (a) is the feedback of compact list shown in Fig. 1 circularly-polarized patch antenna (antenna II) and the entelechy for being not loaded with parasitic patch
Change the artificial reflections charts for finned heat that paster antenna (antenna I) is compared；
Fig. 6 (b) is the reflection coefficient song of the feedback of compact list shown in Fig. 1 circularly-polarized patch antenna (antenna II) emulation and test
Line chart；
Fig. 7 (a) is the feedback of compact list shown in Fig. 1 circularly-polarized patch antenna (antenna II) and the entelechy for being not loaded with parasitic patch
The axis for changing the emulation that paster antenna (antenna I) is compared compares charts for finned heat；
Fig. 7 (b) is that the feedback of compact list shown in Fig. 1 circularly-polarized patch antenna (antenna II) emulation and the axis tested compare curve
Figure；
Fig. 8 is that the gain of emulation and test that compact list shown in Fig. 1 presents broadband circle polarized RFID reader antenna II is bent
Line chart；
Fig. 9 (a) is that the broadband circle polarized RFID reader antenna of the feedback of compact list shown in Fig. 1 is different in 920MHZ with Fig. 9 (b)
The emulation of plane and testing radiation directional diagram；
Figure 10 (a) and Figure 10 (b) be compact list shown in Fig. 1 present broadband circle polarized RFID reader antenna 875MHZ not
Coplanar emulation and testing radiation directional diagram.
Drawing reference numeral explanation: 1, first medium substrate；2, second medium substrate；3, primary radiation patch；4, near field parasitism spoke
Penetrate patch；5, vertical metal plate；6, earth plate；7, feeding point；8, nylon column；9, minor matters；10, elliptical slot；11, it first cuts
Angle；12, SMA feed probes 13, SMA radio-frequency joint 14, the second corner cut；15, circular trough.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment
The present invention provides a kind of compact list and presents broadband circle polarized RFID reader antenna, for increase its impedance bandwidth and
Circular polarisation bandwidth.The broadband circle polarized RFID reader paster antenna of compact list feedback of the invention, including three-decker, described three
Layer structure is respectively first layer primary radiation structure, second layer spurious radiation structure and ground plane structure；The primary radiation structure packet
First medium substrate is included, the half E type metal patch (quilt in the present embodiment modified is etched in the upper surface of first medium substrate
It is configured to primary radiation patch)；The second layer spurious radiation structure includes second medium substrate, in the top of second medium substrate
The square parasitic metal patch that etching one is cut out two an equal amount of angles (is configured near field parasitism in the present embodiment
Radiation patch)；The ground plane structure includes four vertical metal plates and earth plate；The primary radiation patch and near field parasitism spoke
The top that patch is respectively positioned on earth plate is penetrated, the vertical metal plate is rotational symmetry, and the surrounding of earth plate is arranged in.This
Invention passes through primary radiation patch of the half E type metal patch modified as antenna, realizes circular polarization radiation.It is pasted around primary radiation
Four blocks of vertical metal plates are arranged in earth plate surrounding to effectively reduce the horizontal size of antenna in piece surrounding.In order to enhance antenna
Impedance bandwidth and circular polarisation bandwidth, the method which proposes load near field parasitic patch, which not will increase antenna
Highly, it realizes bandwidth operation broadening, near field parasitic radiation patch is added below primary feed, to excite another circular polarisation mould
Formula broadens the circular polarisation bandwidth of antenna, and impedance bandwidth is also enhanced.
Fig. 1 is the stereochemical structure signal that the list in one embodiment of the present invention presents broadband circle polarized RFID paster antenna
Figure, the singly feedback circular polarisation RFID paster antenna II, including primary radiation patch 3, near field parasitic radiation patch 4, earth plate 6 and 4
Vertical metal plate 5.The top of first medium substrate 1 is arranged in the primary radiation patch.The near field parasitic radiation patch is set
It sets in second medium substrate 2；Wherein the material of first medium substrate and second medium substrate can select FR4 epoxy resin or
It is the respective media material that other dielectric constants are 4.4.The height of the vertical metal plate 5 and the height one of primary radiation patch
It causes, does not increase the height of antenna itself；Feed port 7 is located at the lower left of primary radiation patch 3.
Fig. 2 and Fig. 3 is the top view and side view of singly presenting circular polarisation RFID paster antenna, and the shape of primary radiation patch is
The half E type patch modified.When minor matters 9 are not added, the radio-frequency current on patch only flows half E type paster antenna in the direction of the x axis
It is dynamic.After increasing minor matters 9, the radio-frequency current of antenna Y direction is just excited.By adjust both direction current amplitude and
Phase can make antenna generate circular polarization radiation.In order not to increasing the lateral dimension of antenna, need to introduce four it is identical vertical
Metal plate 5, and the surrounding that earth plate is set of rotational symmetry；Four vertical metal plates 5 are connect with earth plate 6, are constituted
There are four the metal cavities of notch for one band.In the present embodiment, four vertical metal plates 5 can effectively reduce the work of patch
Working frequency enables the antenna to work in corresponding RFID frequency range, without increase antenna lateral dimension, metal plate it is a length of
75mm, width 25mm.Simultaneously as metal cavity can play the radiation for inhibiting antenna surrounding, and make antenna towards a side
To the effect of radiation, four metal plates of load effectively raise the antenna pattern front and back ratio of antenna.In order to increase antenna
Circular polarisation purity, need with minor matters 9 half E type patch on increase electric current disturbance unit, for no other reason than that being loaded with vertical
Straight metal plate 5, half E type paster antenna and metal plate with minor matters 9 generate close coupling, impedance bandwidth are caused to narrow, antenna
Radial axis ratio is all larger than 3dB.The half E type patch with minor matters 9 becomes the half E type patch modified.Therefore, half modified
Increasing current disturbing unit on E type patch can be improved the impedance bandwidth and axial ratio bandwidth of antenna.On the half E type patch modified
Etch elliptical slot 10 and the first corner cut 11, the size for adjusting oval groove and the first corner cut can improve the resistance of original antenna
Anti- bandwidth and axial ratio bandwidth.Antenna impedance bandwidth after improvement is 11.6%, and circular polarisation bandwidth is 5.6%, as in this example
Single feedback circular polarisation RFID reader antenna I.
In order to further improve impedance bandwidth and axial ratio bandwidth, the invention proposes one kind not to increase the original height of antenna
In the case where degree, the method for widening of the beamwidth of antenna is realized.In the place installation second medium of the lower section 8mm of first medium substrate 1
The interlayer structure of substrate 2, addition is as shown in Figure 4.There are two the close of identical size corner cut for the setting of second layer medium substrate top surface
Field parasitic radiation patch 4.Second layer medium substrate and the height on ground are 15mm.The near field parasitic radiation patch 4 uses coupling
The mode of conjunction inspires radio-frequency current, generates the degenerate mode of a pair of orthogonal, make its resonance frequency with improve half E type patch it is humorous
Vibration frequency is close.Make the circular polarization pattern phase of two patches by adjusting oval groove 10, the first corner cut 11 and the second corner cut 14
It is mutually close, to expand impedance bandwidth and circular polarisation bandwidth.It is equipped with SMA radio-frequency joint 13 at the feed port 7 and SMA is fed
Probe 12；Equipped with antenna, the SMA radio-frequency joint is welded on one with antenna for the lower section of the second layer spurious radiation structure
It rises, SMA feed probes pass through second layer spurious radiation structure and feed directly to the half E type metal patch modified；Described second
The square-shaped metal patch of layer spurious radiation structure etches a circular trough, for cutting off SMA feed probes and parasitic metal
Patch contact, is generated the second layer and is posted by intercoupling between parasitic metal patch and the half E type metal patch modified
The excitation of raw irradiation structure.
Wherein, as shown in figure 5, antenna I is single feedback circular polarisation RFID reader paster antenna that near field parasitic patch is not added,
And antenna II is that the list that the preferred embodiment of the present invention provides presents broadband circle polarized RFID reader paster antenna.From Fig. 6 (a), Fig. 6
(b), 7 (a), the addition that Fig. 7 (b) result can be seen that near field parasitic radiation patch not will increase the height of antenna, and broadening
The impedance bandwidth and axial ratio bandwidth of single feedback circular polarisation RFID reader paster antenna.So that improved single feedback circular polarized antenna
Impedance measurement bandwidth can achieve 14.2% (833-960MHz), 3dB axial ratio bandwidth can achieve 9.0% (846-
926MHz)。
Fig. 8 is the gain of emulation and test that list of the invention shown in Fig. 1 presents broadband circle polarized RFID reader antenna II
Curve graph, it can be seen from the figure that its gain is relatively stable in axial ratio bandwidth, test highest-gain reaches 7.6dBic.
Further, single feedback Broadband circularly polarized antenna of the invention needs 4 nylon columns 8 to be assembled and installed, 4 Buddhist nuns
Imperial column 8 is mounted on the surrounding of double-layer structure and ground plane, plays the role of fixed structure.The list feedback of the present embodiment is broadband circle polarized
It, can shown in antenna pattern such as Fig. 9 (a), Fig. 9 (b) of x-z-plane and y-z plane of the RFID reader antenna in 870MHz
It in a manner of finding out the antenna pattern of antenna in directed radiation, is radiated along positive Z-direction, the back lobe of antenna pattern is smaller.
Figure 10 (a), Figure 10 (b) RFID reader antenna in the x-z-plane of 920MHz and the antenna pattern of y-z plane, directional diagram compared with
Stablize, co-polarization ratio of gains cross polarization gain is greater than 15dB, than equal before and after 3dB axial ratio bandwidth internal antenna antenna pattern
Greater than 14dB.
The compact list that the present invention designs presents broadband circle polarized RFID reader antenna, and designer can be first according to oneself institute
The frequency range wanted determines the size of primary radiation patch, if size is larger, can reduce frequency using the metal plate of sequence rotation, reach
To the effect for reducing size.By adding parasitic radiation patch in the lower section of the primary radiation patch selected, the shape of patch is different
Surely identical as primary radiation patch, but to meet primary radiation patch working frequency and parasitic patch operating mode it is close.
Then the size for adjusting the current disturbing unit of the distance between two patches and each patch, to optimize the work of antenna
Impedance bandwidth and circular polarisation bandwidth.Other than these single-feed antennas, the technical solution that the present invention expands bandwidth can also be applied
In the even more feed circularly-polarized patch antennas of duplex feeding.
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, other any changes, modifications, substitutions, combinations, simplifications made without departing from the spirit and principles of the present invention,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
1. a kind of compact list presents broadband circle polarized RFID reader antenna, which is characterized in that including three-decker, described three layers
Structure is respectively first layer primary radiation structure, second layer spurious radiation structure and ground plane structure；The primary radiation structure includes
First medium substrate etches the half E type metal patch modified, half modified in the upper surface of first medium substrate
E type metal patch is to etch elliptical slot at the center of half E type metal patch, and corner cut is arranged in the position at a wherein angle,
And one section of minor matters is added in half E type metal patch, so that it is formed by paster antenna and generates circular polarization radiation；The second layer is posted
Raw irradiation structure includes second medium substrate, etches one in the top of second medium substrate and is cut out two an equal amount of angles
Parasitic metal patch；The ground plane structure includes four vertical metal plates and earth plate, and four vertical metal plates are
Rotational symmetry, and the surrounding of earth plate is set, the vertical metal plate is connected with earth plate, is constituted there are four a bands
The metal cavity of notch；The bottom of the earth plate is equipped with feed port, be equipped at the feed port SMA radio-frequency joint and
SMA feed probes；Equipped with antenna, the SMA radio-frequency joint with antenna welds for the lower section of the second layer spurious radiation structure
It is connected together, SMA feed probes pass through second layer spurious radiation structure and feed directly to the half E type metal patch modified；Institute
The square-shaped metal patch for stating second layer spurious radiation structure etches a circular trough, for cutting off SMA feed probes and posting
Raw metal patch contact generates the by intercoupling between parasitic metal patch and the half E type metal patch modified
The excitation of two layers of spurious radiation structure.
2. compact list presents broadband circle polarized RFID reader antenna according to claim 1, which is characterized in that described first
Medium substrate is square substrate, and substrate side length is 140mm.
3. compact list presents broadband circle polarized RFID reader antenna according to claim 1, which is characterized in that described to have repaired
The long side of the half E type metal patch changed is 125mm, broadside 110mm；
The long axis of the elliptical slot is 27mm, short axle 18.9mm；
The length of the corner cut is 27mm.
4. compact list presents broadband circle polarized RFID reader antenna according to claim 1, which is characterized in that the parasitism
Metal patch is clipped squares patch.
5. compact list presents broadband circle polarized RFID reader antenna according to claim 4, which is characterized in that described lacks
Angle square patch length is 122mm, length of corner cut 30mm.
6. compact list presents broadband circle polarized RFID reader antenna according to claim 1, which is characterized in that the antenna
The shape of earth plate is square, side length 150mm.
7. compact list presents broadband circle polarized RFID reader antenna according to claim 1, which is characterized in that
The first layer primary radiation structure height is 1mm；
The height of the second layer spurious radiation structure is 1mm；
The distance of the first layer primary radiation structure and second layer spurious radiation structure is 8mm；
The second layer spurious radiation structure is 15mm at a distance from ground.
8. compact list presents broadband circle polarized RFID reader antenna according to claim 1, which is characterized in that further include using
In the nylon column of fixed first layer primary radiation structure, second layer spurious radiation structure and ground plane structure, the nylon column peace
Fill the surrounding of each layer structure.
9. compact list presents broadband circle polarized RFID reader antenna according to claim 1, which is characterized in that described first
It is 4.4 FR4 medium substrate that medium substrate, which selects dielectric constant, with a thickness of 1mm.
10. compact list presents broadband circle polarized RFID reader antenna according to claim 1, which is characterized in that described the
It is 4.4 FR4 medium substrate that second medium substrate, which selects dielectric constant, with a thickness of 1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810840531.XA CN109149092B (en) | 2018-07-27 | 2018-07-27 | Compact single-feed broadband circularly polarized RFID reader antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810840531.XA CN109149092B (en) | 2018-07-27 | 2018-07-27 | Compact single-feed broadband circularly polarized RFID reader antenna |
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| Publication Number | Publication Date |
|---|---|
| CN109149092A true CN109149092A (en) | 2019-01-04 |
| CN109149092B CN109149092B (en) | 2023-12-29 |
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| CN201810840531.XA Active CN109149092B (en) | 2018-07-27 | 2018-07-27 | Compact single-feed broadband circularly polarized RFID reader antenna |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310609A (en) * | 2020-11-25 | 2021-02-02 | 福州大学 | Low-profile wide-beam circularly polarized reader antenna applied to RFID |
| CN113036459A (en) * | 2021-03-08 | 2021-06-25 | 安徽大学 | Millimeter wave low-profile broadband circularly polarized slot-fed dipole array antenna |
| CN117832829A (en) * | 2024-02-28 | 2024-04-05 | 长光卫星技术股份有限公司 | S-band double-layer microwave bandwidth beam antenna based on metal cavity |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105896091A (en) * | 2016-06-07 | 2016-08-24 | 桂林电子科技大学 | Miniaturized broadband high-gain circular polarized microstrip antenna |
| US20170025762A1 (en) * | 2015-07-20 | 2017-01-26 | The Regents Of The University Of California | Low-Profile Circularly-Polarized Single-Probe Broadband Antenna |
| CN107895846A (en) * | 2017-10-30 | 2018-04-10 | 华南理工大学 | One kind has wide band circularly-polarized patch antenna |
| CN208723085U (en) * | 2018-07-27 | 2019-04-09 | 华南师范大学 | Compact list presents broadband circle polarized RFID reader antenna |
-
2018
- 2018-07-27 CN CN201810840531.XA patent/CN109149092B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170025762A1 (en) * | 2015-07-20 | 2017-01-26 | The Regents Of The University Of California | Low-Profile Circularly-Polarized Single-Probe Broadband Antenna |
| CN105896091A (en) * | 2016-06-07 | 2016-08-24 | 桂林电子科技大学 | Miniaturized broadband high-gain circular polarized microstrip antenna |
| CN107895846A (en) * | 2017-10-30 | 2018-04-10 | 华南理工大学 | One kind has wide band circularly-polarized patch antenna |
| CN208723085U (en) * | 2018-07-27 | 2019-04-09 | 华南师范大学 | Compact list presents broadband circle polarized RFID reader antenna |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310609A (en) * | 2020-11-25 | 2021-02-02 | 福州大学 | Low-profile wide-beam circularly polarized reader antenna applied to RFID |
| CN113036459A (en) * | 2021-03-08 | 2021-06-25 | 安徽大学 | Millimeter wave low-profile broadband circularly polarized slot-fed dipole array antenna |
| CN117832829A (en) * | 2024-02-28 | 2024-04-05 | 长光卫星技术股份有限公司 | S-band double-layer microwave bandwidth beam antenna based on metal cavity |
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| Publication number | Publication date |
|---|---|
| CN109149092B (en) | 2023-12-29 |
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