CN108767429A - Micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages - Google Patents
Micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages Download PDFInfo
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- CN108767429A CN108767429A CN201810571537.1A CN201810571537A CN108767429A CN 108767429 A CN108767429 A CN 108767429A CN 201810571537 A CN201810571537 A CN 201810571537A CN 108767429 A CN108767429 A CN 108767429A
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- micro
- strip
- leaky wave
- wave antenna
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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
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- 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
- H01Q1/36—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
- H01Q1/48—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/10—Resonant slot antennas
- H01Q13/106—Microstrip slot antennas
Abstract
The invention discloses a kind of micro-strip leaky wave antennas towards the application of ultra-high-frequency passive RFID Distributed coverages, including the gap combination based on periodically eight word slot elements being provided on upper layer metal micro-strip, medium substrate and its bottom copper-plated ground surface plate, gap combination based on periodically eight word slot elements may make along microstrip line there is energy radiation, to effectively be distinguished to the passive label in strip region.The reading uniformity of label along antenna is promoted finally by the form of adjustment terminating load resistance value.The advantages that present invention has low cost as RFID reader antenna, light-weight, is easy to conformal, and concealment is strong, can be effectively applied to the Internet of Things field such as library, storage rack, smart home, whole safeguard fence.
Description
Technical field
The present invention relates to antenna technical fields, are covered towards hyperfrequency (UHF) passive RFID distribution more particularly to one kind
Cover the micro-strip leaky wave antenna of application.
Background technology
Radio frequency identification (RFID) technology, the key technology as structure Internet of Things receive people and more and more pay close attention to.
In recent years, there are some new demands in application field, is mainly manifested in and how to realize distribution to a certain specified region
Formula covers, when especially the region is an elongated zones, such as the long continuous productive process arranged in book stand, industrial production in library
Line, the region that security protection fence is monitored, the irregular overlay area etc. in smart home.Traditional directional radiation antenna
Because of its beam coverage area underaction, can not be competent at.To solve this RFID Distributed coverage application demand, use at present
Solution is generally worked at the same time to cover specified region by multiple antennas, this would generally increase the cost of whole system, and
System arranges that complexity is higher.
The characteristics of in view of above-mentioned Internet of Things application demand, sets in the metal floor layer etching of conventional microstrip line by special
The transmission and radiation of energy can be achieved at the same time in the period gap of meter, and the micro-strip leaky wave antenna of formation has as RFID reader antenna
It hopes and effective solution is provided, realize the Distributed coverage to specifying region.Based on this, the present invention devises a kind of towards super
There is planar structure to be conducive to conformal peace for the micro-strip leaky wave antenna of high frequency passive RFID Distributed coverages application, the RFID antenna
Dress is had preferable concealment, while can further be reduced as the medium substrate of microstrip line using physical blowing medium
Cost mitigates weight, so as to be effectively applied to the Internet of Things such as library, storage rack, smart home, whole safeguard fence neck
Domain solves some new demands.
Invention content
The object of the present invention is to provide a kind of strip shaped microstrip leaky wave antennas, are applicable as ultra-high-frequency passive RFID reader
Antenna realizes the Distributed coverage to specific sleeve configuration region, and then effectively identifies the label in the region.
The present invention is achieved by the following technical solutions：
The present invention towards ultra-high-frequency passive RFID Distributed coverages application micro-strip leaky wave antenna, including from top to bottom according to
Metal micro-strip layer, medium substrate and the metal floor layer of secondary arrangement, the metal floor layer is provided with to be stitched based on periodically eight words
It combines in the gap of gap unit.
The bright micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages of we, the medium substrate are contained
Cover FR4, F4B, a variety of medium substrates such as physical blowing dielectric-slab.
The bright micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages of we, it is described based on periodically
The gap of eight word slot elements is combined as multiple eight words slot element lateral periodicity arrangements or longitudinal periodicity arrangement.
The bright micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages of we is based on the period when described
Property eight word slot elements gap combination eight word slot element longitudinal arrangements, eight word slot element numbers be 3 or multiple, seam
Gap length, width are equal or different, and spacing can be equidistant or non-equidistant.
The bright micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages of we is based on the period when described
Property eight word slot elements gap combination eight word slot elements it is transversely arranged, eight word slot element numbers be 4 or multiple, seam
Gap length, width are equal or different, and spacing can be equidistant or non-equidistant.
The bright micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages of we, to improve Antenna Operation
When along label read uniformity, can suitably change terminating load form according to actual antennas.
It is provided in an embodiment of the present invention towards ultra-high-frequency passive RFID it can be seen from the technical solution that foregoing invention provides
The long strip type micro-strip leaky wave antenna that near field is read has the characteristics that high-energy leakage and remote transmission, can be used as reader
Antenna realizes the Distributed coverage in specific sleeve configuration region.
Description of the drawings
Fig. 1 is micro-strip leaky wave antenna as passive RFID system reader antenna Distributed coverage schematic diagram.
Fig. 2 is micro-strip leaky wave antenna structural schematic diagram in the embodiment of the present invention.
Fig. 3 is micro-strip leaky wave antenna floor longitudinal slot structure chart in the embodiment of the present invention.
Fig. 4 is micro-strip leaky wave antenna floor transverse slot structure chart in the embodiment of the present invention.
Fig. 5 is electric-field intensity distribution curve at different distance along micro-strip leaky wave antenna in the embodiment of the present invention.
Fig. 6 is electric-field intensity distribution curve at 30cm under micro-strip leaky wave antenna different loads in the embodiment of the present invention.
Reference numeral meaning is in figure：1 is metal micro-strip line, and 2 be medium substrate, and 3 be metal floor layer, and 4 is periodically
It combines in the gap of eight word slot elements.
Specific implementation mode
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention has carried out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, rather than whole embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The micro-strip leaky wave antenna applied to ultra-high-frequency passive RFID of the present invention, preferable specific implementation mode are：
Including the metal micro-strip line being sequentially arranged from top to bottom, medium substrate layer, metal floor layer, the metal floor
Layer is provided with the gap combination based on periodically eight word slot elements.
The gap based on periodically eight word slot elements is combined as transversely arranged or longitudinal arrangement multiple seams
Gap combines
When it is described based on periodically eight word slot elements gap be combined as longitudinal arrangement more gaps combination, using three
Gap composite structure.
It is combined when the gap based on periodically eight word slot elements is combined as transversely arranged more gaps, using four
Gap composite structure.
The micro-strip leaky wave antenna towards ultra-high-frequency passive RFID applications of the present invention, is used as passive RFID reader day
Line has the characteristics that electromagnetic signal is radiated in transmission.As ultra-high-frequency passive RFID reader antenna, microstrip line leaky wave antenna
It can be achieved effectively to identify the label along the internal antenna of specific sleeve configuration region.
In the present invention, the micro-strip leaky wave antenna using over long distances design, length can according to application scenario demand into
Row rationally designs, and metal floor layer uses the pattern of cracking of the gap combination based on periodically eight word slot elements.
The described gap combination based on periodically eight word slot elements, occurs with more gap combining forms, and can be with
Using more gap longitudinal arrangements and horizontal mode.
Preferably, the medium substrate uses physical blowing medium, can effectively reduce design cost while mitigate day
The weight of line.
Preferably, the gap combination based on periodically eight word slot elements uses longitudinal three gap arrangement modes, can
Increase so that micro-strip leaky wave antenna is radiated when relatively short distance is designed along heat input, is conducive to add under short range antenna structure
By force to the reading distance of passive label.
Preferably, laterally four gap arrangement modes are adopted in the gap combination based on periodically eight word slot elements, can be with
There is relatively uniform Energy distribution along making micro-strip leaky wave antenna when long range designs, be conducive to increase micro-strip and sew day
The discrimination of passive label along line.
Preferably, when micro-strip leaky wave antenna work, terminal load can be according to practical application tune terminating load
Form promotes label along antenna and reads uniformity.
Beneficial effects of the present invention：
Micro-strip leaky wave antenna proposed by the present invention applied to ultra-high-frequency passive RFID system is brought to micro-strip leaky wave antenna
A kind of completely new application model and design pattern.
1. what the present invention used carries out design of cracking in microstrip line, two-way electromagnetic energy leakage can be improved,
Certain application scenarios have good application value.
2. using the Figure of eight structure slit design of longitudinal more gap arrangements, edge can be changed by changing slot inclination angle degree
Heat input radiates size, final so that micro-strip leaky wave antenna has reading distance farther out in the shorter application scenario of length.
3. using the Figure of eight structure slit design of laterally more gap arrangements, it is suitable for long range micro-strip leaky wave antenna and designs,
Lateral arrangement structure can make along Energy distribution it is relatively uniform, improve antenna footprint under passive label discrimination.
4. compared with traditional near field ultrahigh frequency RFID reader antenna, this micro-strip leaky wave antenna can be realized to specific long and narrow
The Distributed coverage in type region, to some new demands in effective solution Internet of Things field.
Specific embodiment：
To keep above-mentioned purpose, the features and advantages of the present invention more obvious and easy to understand, below in conjunction with the accompanying drawings and specific embodiment party
The present invention is described in further detail for formula.
With reference to Fig. 2, the present invention provides the structures of the uniform micro-strip leaky wave antenna embodiment of energy leakage along a kind of 1
Figure, specifically include micro-strip metal layer 1, medium substrate layer 2, metal floor layer 3 and metal floor layer 3 based on periodically eight words
The gap combination 4 of slot element.
It is basic structure that this structure, which is with microstrip line, is configured as ultra-high-frequency passive RFID antenna, operating center frequency is
915MHz, microstrip line characteristic impedance are 50 ohm, microstrip line layer metal micro-strip width w1It can be by microstrip line characteristic impedance formula
It acquires：
Wherein, h indicates the thickness of medium substrate, εrFor the relative dielectric constant of medium substrate, t indicates microstrip line metal layer
Thickness.
Using eight word gap structures of laterally or longitudinally more gap arrangement modes, the period can be determined by following formula：
Wherein λ0For the wavelength under center of antenna working frequency,C is propagation velocity of electromagnetic wave in vacuum, f0For
Center operating frequency of the micro-strip leaky wave antenna in RFID system, εrOpposite dielectric for the medium substrate of micro-strip leaky wave antenna is normal
Number, P are the length in eight word slot element periods.
The value of each gap width length and width degree is：
20mm≤Li≤40mm
2mm≤wi≤4mm
It combines to form eight word slot elements using longitudinal more gaps, typical case is as shown in figure 3, its each gap spacing value is：
10mm≤m≤20mm, energy coupling journey between slot element can be controlled by adjusting the size of the length in each gap, width and spacing
Degree, to change overall radiation performance.
The value range of tiltangleθ is 55 °≤θ≤65 °, and the longitudinally cutting current level in the more big then gap of θ angles increases, edge
The electromagnetic energy that line is sewed increases, simultaneous transmission loss aggravation.
The value principle of each parameter is above：Gap period P will be according to design micro-strip leaky wave antenna length and leaky-wave antenna
Period Formula considers value；Gap width value range is in above-mentioned section；Gap length L values are big according to floor width
Small and micro-strip leaky wave antenna design length determines that transmission loss is aggravated when L increases, and energy transmission distance shortens, and antenna is practical
Can operating distance shorten.
Eight word slot element arrangement modes can also be adjusted as follows in the embodiment above：
Eight word slot elements of the gap combination 4 based on periodically eight word slot elements are changed to by longitudinal more gap arrangements
Laterally more gaps are arranged in parallel, and typical as shown in figure 4, micro-strip leaky wave antenna is reinforced along beta radiation at this time, Antenna Operation length becomes
It is short.
Combine to form eight word slot elements using laterally more gaps, laterally the spacing m value ranges in each gap be changed to 5mm≤
m≤10mm。
Usually, using more gaps as shown in Figure 2 periodically eight word cells, when sewing microstrip line work, terminal load
Pattern can select different loads form to increase the uniformity that label is read along antenna according to the length and size of design.
Using floor joint pattern shown in Fig. 3 as numerical：Here citing is intended merely to demonstrate above-mentioned reality
Applying method is applied in specific micro-strip leaky wave antenna design, is not offered as the embodiment above and is only applicable in number set forth below
According to.
Selection medium substrate is physical blowing medium substrate, and relative dielectric constant 1.26, dielectric substrate thickness is
2mm, width 40mm, upper layer metal micro-strip line width are 40mm, and thickness is the metal copper layer of 0.035mm.Selection is cracked period P
=243.5mm；Gap equal length L=21.3mm；Gap equal in width w=4mm；The equidistant m=16.8mm in parallel slit；Incline in gap
Bevel angle θ=59 °, overall antenna length degree are 6 periods, a length of 1461mm.
Model emulation is carried out in HFSS all-wave 3 D electromagnetics simulation software, micro-strip leaky wave antenna input terminal power is 1W,
Terminal is connected to matched load, and Fig. 5 gives along micro-strip leaky wave antenna that electric-field intensity distribution is bent in polarization direction at different distance
Line.Electric field strength at 30cm right over micro-strip leaky wave antenna is calculated, 90% area above electric field intensity value is more than
0.8V/m.For common ultra-high-frequency passive tag, by taking Alien 9662 as an example, minimum activation power is generally -15dBm,
It is 0.478V/m that the corresponding field minimum intensity value for activating label, which is calculated,.Fig. 6 gives negative in three kinds of special terminations
Electric-field intensity distribution curve at 30cm along micro-strip leaky wave antenna, as can be seen from the figure changes matched load under load pattern
Change can improve along field distribution, tag recognition rate along increase.Therefore, micro-strip leaky wave antenna, which is applied, is used as ultra-high-frequency passive
RFID reader antenna can reach passive label discrimination at 30cm along microstrip line leaky wave antenna under 1W power inputs
To 90% or more.
The foregoing is only a preferred embodiment of the present invention, but being not limited in protection scope of the present invention
This, any one skilled in the art the variation that can readily occur in or replaces in the technical scope of present disclosure
It changes, should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection of claims
Subject to range.
Claims (6)
1. a kind of micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages, which is characterized in that including by upper
The metal micro-strip line (1) that is sequentially arranged under, medium substrate (2), metal floor layer (3), the metal floor layer (3) are provided with
Combine (4) in gap based on periodically eight word slot elements.
2. the micro-strip leaky wave antenna according to claim 1 towards the application of ultra-high-frequency passive RFID Distributed coverages, special
Sign is that the medium substrate (2) covers FR4, F4B, a variety of medium substrates such as physical blowing dielectric-slab.
3. the micro-strip leaky wave antenna according to claim 1 towards the application of ultra-high-frequency passive RFID Distributed coverages, special
Sign is that the gap combination (4) based on periodically eight word slot elements is multiple horizontally-parallel arrangements of eight words slot element
Or parallel longitudinal arrangement.
4. the micro-strip leaky wave antenna according to claim 1 or 2 towards the application of ultra-high-frequency passive RFID Distributed coverages,
Be characterized in that, when it is described based on periodically eight word slot elements gap combine (4) the eight parallel longitudinal arrangements of word slot element,
Eight word slot element numbers are 3 or multiple, and gap length, width are equal or different, and spacing can be equidistant or non-equidistant.
5. the micro-strip leaky wave antenna according to claim 1 or 2 towards the application of ultra-high-frequency passive RFID Distributed coverages,
Be characterized in that, when it is described based on periodically eight word slot elements gap combine (4) the eight horizontally-parallel arrangements of word slot element,
Eight word slot element numbers are 4 or multiple, and gap length, width are equal or different, and spacing can be equidistant or non-equidistant.
6. the micro-strip leaky wave antenna according to claim 1 or 2 towards the application of ultra-high-frequency passive RFID Distributed coverages,
Be characterized in that, for improve Antenna Operation when along label read uniformity, can suitably change terminating load shape according to actual antennas
Formula.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810571537.1A CN108767429A (en) | 2018-06-06 | 2018-06-06 | Micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages |
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| CN201810571537.1A CN108767429A (en) | 2018-06-06 | 2018-06-06 | Micro-strip leaky wave antenna towards the application of ultra-high-frequency passive RFID Distributed coverages |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921196A (en) * | 2019-03-12 | 2019-06-21 | 合肥应为电子科技有限公司 | A kind of phased array antenna structure with ultra wide band wide-angle scanning function |
| CN113745838A (en) * | 2021-08-26 | 2021-12-03 | 中山大学 | Leaky-wave antenna with dual-beam radiation |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020180644A1 (en) * | 2001-02-16 | 2002-12-05 | Ems Technologies, Inc. | Method and system for increasing RF bandwidth and beamwidth in a compact volume |
| JP2004350163A (en) * | 2003-05-23 | 2004-12-09 | Anritsu Corp | Dielectric body leak wave antenna |
| CN201146246Y (en) * | 2008-01-17 | 2008-11-05 | 华南理工大学 | Radio frequency recognition circular polarization reader array antenna based on annular feed network |
| CN103337711A (en) * | 2013-05-31 | 2013-10-02 | 中科院杭州射频识别技术研发中心 | Ultrahigh frequency near field RFID reader-writer antenna based on photonic crystal |
| US8669904B2 (en) * | 2010-12-03 | 2014-03-11 | Electronics & Telecommunications Research Institute | Near-field antenna |
| CN104638354A (en) * | 2013-11-07 | 2015-05-20 | 富士通株式会社 | Antenna apparatus |
| CN204651491U (en) * | 2015-05-25 | 2015-09-16 | 华南理工大学 | There is the difference gap mimo antenna of high cmrr |
-
2018
- 2018-06-06 CN CN201810571537.1A patent/CN108767429A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020180644A1 (en) * | 2001-02-16 | 2002-12-05 | Ems Technologies, Inc. | Method and system for increasing RF bandwidth and beamwidth in a compact volume |
| JP2004350163A (en) * | 2003-05-23 | 2004-12-09 | Anritsu Corp | Dielectric body leak wave antenna |
| CN201146246Y (en) * | 2008-01-17 | 2008-11-05 | 华南理工大学 | Radio frequency recognition circular polarization reader array antenna based on annular feed network |
| US8669904B2 (en) * | 2010-12-03 | 2014-03-11 | Electronics & Telecommunications Research Institute | Near-field antenna |
| CN103337711A (en) * | 2013-05-31 | 2013-10-02 | 中科院杭州射频识别技术研发中心 | Ultrahigh frequency near field RFID reader-writer antenna based on photonic crystal |
| CN104638354A (en) * | 2013-11-07 | 2015-05-20 | 富士通株式会社 | Antenna apparatus |
| CN204651491U (en) * | 2015-05-25 | 2015-09-16 | 华南理工大学 | There is the difference gap mimo antenna of high cmrr |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109921196A (en) * | 2019-03-12 | 2019-06-21 | 合肥应为电子科技有限公司 | A kind of phased array antenna structure with ultra wide band wide-angle scanning function |
| CN113745838A (en) * | 2021-08-26 | 2021-12-03 | 中山大学 | Leaky-wave antenna with dual-beam radiation |
| CN113745838B (en) * | 2021-08-26 | 2022-09-30 | 中山大学 | Leaky-wave antenna with dual-beam radiation |
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