CN106486783B - The novel leakage cable of internet of things oriented application - Google Patents
The novel leakage cable of internet of things oriented application Download PDFInfo
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- CN106486783B CN106486783B CN201611081248.0A CN201611081248A CN106486783B CN 106486783 B CN106486783 B CN 106486783B CN 201611081248 A CN201611081248 A CN 201611081248A CN 106486783 B CN106486783 B CN 106486783B
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- gap
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- 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
- H01Q13/20—Non-resonant leaky-waveguide or transmission-line antennas; Equivalent structures causing radiation along the transmission path of a guided wave
-
- 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
Abstract
The invention discloses a kind of novel leakage cables of internet of things oriented application, and including inner conductor, dielectric layer, outer conductor, the insulating protective layer being sequentially arranged by internal layer outer layers, outer conductor is provided with continuous gap along axial direction, and the two sides in continuous gap are provided with periodical gap.Continuous gap is wavy bending type gap or linear gap, the interlaced arrangement in periodical gap of continuous gap two sides.Periodical gap is single triangular slits or multiple triangle sets joint close gaps or is L-type or U-shaped gap.Suitable for RFID of Internet-of-things/Application in Sensing, there is high coupling loss.As hyperfrequency (UHF) Internet of Things antenna, the leakage coaxial cable of high coupling loss can provide larger radiation energy to activate label to achieve the purpose that reading at a distance.
Description
Technical field
The present invention relates to the novel leakage cables that a kind of leakage coaxial cable more particularly to a kind of internet of things oriented are applied.
Background technique
In recent years, there are some new, urgent application demands in RFID of Internet-of-things, Application in Sensing field.These are needed
It asks and shows two aspects: 1) requiring hyperfrequency (UHF) Internet of Things antenna that can cover and only cover a specified region；2)
It is required that passive UHF RFID label tag is integrated with passive sensor, passive RFID/Sensor is formed, is realized to object in specific region
The recognition of body and the perception of physical environment information.When this region is an elongated zones, the one of such as long row's storage rack
The management of product, fine manipulation greenhouse on article and temperature and humidity monitor, an industrial processing line on layer
Each plant of a line crops mark and Temperature and Humidity Control, the fence of safety monitoring etc., Internet of Things is as using tradition
Directional radiation antenna, can because beam coverage area is excessive or is unable to flexible modulation, it is difficult to competent.Existing solution generally by
Multiple antennas works at the same time to cover and need region.How a kind of deployment flexible, regulation convenient, inexpensive solution is found,
It realizes and formulates elongated zones or other irregular codes RFID/ sensing covering, very worth research.
Leakage coaxial cable is to open a series of gaps in coaxial cable outer conductor to make its transmission energy that can reveal to come together
When achieve the purpose that signal transmission and aerial radiation.The characteristics of in view of above-mentioned Internet of Things application demand, is sewed using leakage cable
Coaxial cable, it is expected to which excellent solution is provided.Using the leakage cable Jing Guo special designing as hyperfrequency Internet of Things antenna, lead to
Cross the different interleaving deployment of leakage cable, can flexibly, conveniently realize Distributed coverage to arbitrary region, thus push Internet of Things without
Source RFID/ senses application in terms of storage rack, industrial production continuous productive process, green agriculture greenhouse, security protection.
Currently, existing leakage cable is applied to the communications field, coupling loss is small, radiation energy is low, directly applies to superelevation
It can only achieve several centimetres to the effective reading distance of passive RFID tags when in frequency Internet of things system, be unable to satisfy normal work
The demand of environment.
Summary of the invention
The novel leakage cable for the internet of things oriented application with high coupling loss that the object of the present invention is to provide a kind of.
The purpose of the present invention is what is be achieved through the following technical solutions:
The novel leakage cable of internet of things oriented application of the invention, including be sequentially arranged by internal layer outer layers inner conductor, be situated between
Matter layer, outer conductor, insulating protective layer, the outer conductor are provided with continuous gap along axial direction, and the two sides in the continuous gap are provided with week
Phase property gap.
As seen from the above technical solution provided by the invention, internet of things oriented provided in an embodiment of the present invention is applied
Novel leakage cable is suitable for RFID of Internet-of-things/Application in Sensing, has high coupling loss, the leakage coaxial cable of high coupling loss can
To provide larger radiation energy to activate label to achieve the purpose that reading at a distance.
Detailed description of the invention
Fig. 1 is the Internet of Things multiaerial system schematic diagram in conjunction with switch arrays.
Fig. 2 is leakage coaxial cable as Internet of Things antenna Distributed coverage schematic diagram.
Fig. 3 is leakage coaxial cable axial direction schematic diagram in the embodiment of the present invention.
Fig. 4 is leakage coaxial cable outer conductor slotting structure design parameter schematic diagram in the embodiment of the present invention.
Fig. 5 is outer conductor slotting structure schematic diagram when inclination angle is 0 ° in the embodiment of the present invention.
Fig. 6 is superimposed triangular outer conductor slotting structure schematic diagram in the embodiment of the present invention.
Fig. 7 is the U-shaped outer conductor slotting structure schematic diagram in two sides in the embodiment of the present invention.
Fig. 8 is two sides L-type outer conductor slotting structure schematic diagram in the embodiment of the present invention.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the 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 novel leakage cable of internet of things oriented application of the invention, preferable specific embodiment is:
Including inner conductor, dielectric layer, outer conductor, the insulating protective layer being sequentially arranged by internal layer outer layers, the outer conductor
It is provided with continuous gap along axial direction, the two sides in the continuous gap are provided with periodical gap.
The continuous gap is wavy bending type gap or linear gap, the periodicity of the continuous gap two sides
The interlaced arrangement in gap.
The periodicity gap is single triangular slits or multiple triangle sets joint close gaps.
When the periodical gap is single triangular slits, gap uses the long bevel edge triangular slits of gradual change.
The periodicity gap is L-type or U-shaped gap.
The novel leakage cable of internet of things oriented application of the invention, is applied to Internet of things system, is suitable for RFID of Internet-of-things/biography
Induction is used, and has high coupling loss.As hyperfrequency (UHF) Internet of Things antenna, the leakage coaxial cable of high coupling loss can be with
Larger radiation energy is provided to activate label to achieve the purpose that reading at a distance.
In the present invention, the leakage coaxial cable is provided with continuous bending type seam using completely new mode of cracking, in outer conductor
Gap and its two sides periodic triangular shape gap or triangle sets joint close gap and other shapes gap constitute the gap array of leakage cable；
In the gap array, continuous bending type gap is the basis of cracking of this structure, this continuous gap can guarantee
It is conducive to provide the leakage energy of stable and uniform, so that leakage cable is uniformly distributed along axial electric field, while by adjusting center slot
Width and inclination angle can change the size of basic leakage energy.Continuous bending type gap two sides are in upper and lower staggered week
Phase property triangular slits or triangle sets joint close gap and other shapes gap, can be further improved the coupling of leakage coaxial cable
Loss is closed, improves the polarization mismatch problem of leakage coaxial cable, improves the overall performance of high coupling loss leakage coaxial cable.
Preferably, staggered gap uses triangular slits structure up and down in the gap array, and bevel edge can make
Circumferential and axial field component has phase difference, it can be achieved that elliptic polarization mode, is conducive to improve RFID of Internet-of-things/sensing label
Read rate.
Preferably, staggered gap uses the long bevel edge triangular slits of gradual change or combination up and down in the gap array
Gap can make leakage coaxial cable make to leak cable characteristic impedance variation slowly at place of cracking, reduce reflection, reduce transmission loss, most
Reaching under high coupling loss eventually has large free working distance.
Preferably, staggered gap uses L-type or U-shaped gap up and down in the gap array, circumferential to leakage cable
When radiation polarization is of less demanding, be conducive to the design of Structural Parameters for simplifying leakage cable, increase the stability of leakage cable processing and manufacturing.
Beneficial effects of the present invention:
1, the high coupling loss leakage coaxial cable applied to Internet of things system proposed by the invention gives leakage coaxial electricity
Cable brings completely new application model, has filled up blank of the leakage cable in RFID of Internet-of-things/Application in Sensing.
2, the present invention guarantees to mention under passive RFID/Application in Sensing background using completely new continuous bending type slot opening form
For the axial electric field distribution of stable and uniform, at the same it is big by the changeable leakage cable basis leakage energy of adjustment to slit width and inclination angle
It is small.
3, continuous bending type gap two sides are in upper and lower staggered periodic triangular shape gap or triangle sets joint close gap
And other shapes gap, it can be further improved the coupling loss of leakage coaxial cable, improve the polarization of leakage coaxial cable
Mismatch problems reduce reflection, improve high coupling loss leakage coaxial cable and are applied in Internet of things system as read antenna
It is whole to read performance.
4, compared with traditional communication leaks cable, 20dB or more is can be improved in coupling loss parameter, makes it as Internet of Things antenna
The reading distance of passive label is significantly increased afterwards.
Specific embodiment:
To keep above-mentioned purpose of the invention, features and advantages more obvious and easy to understand, with reference to the accompanying drawing and specific embodiment party
The present invention is described in further detail for formula.
Referring to Fig. 3, one's duty invention proposes a kind of structure chart of the leakage coaxial cable embodiment 1 of high coupling loss, tool
Body includes that inner conductor 1, dielectric layer 2, outer conductor 3, the continuous gap 5 of insulating protective layer 4 and outer conductor center and two sides are periodical
Gap 6.
This structure is periodic structure, is configured as hyperfrequency RFID of Internet-of-things antenna, therefore operating center frequency is
915MHz.According to formula:
Wherein λ0For center operation wavelength, 329mm is taken herein；εrThe relative dielectric constant of medium between internal and external conductor.Cause
This, can determine the value range of the period P under hyperfrequency RFID of Internet-of-things operating mode from there.
The gap period is determined by following formula:
0.4P≤L≤0.5P
0.5b≤h1≤b
0.5h1≤h≤0.9h1
Wherein λ0For center operation wavelength, byIt determines, c is electromagnetic wave propagation speed in free space, f0For
The center operating frequency of leakage coaxial cable design；εrThe relative dielectric constant of medium between internal and external conductor；B is leakage coaxial
The outer diameter of cable outer conductor.
Continuous bending type gap width and inclination angle value are as follows:
1.5mm≤w≤3mm
0°≤θ≤10°
Under the triangular slits arrangement architecture distance center gap of center slot two sides the horizontal distance on vertex be 0.05P~
0.2P。
Continuous bending type gap purpose achievees the purpose that enhance coupling loss for more cutting current, while providing steady
Fixed uniform axial electric field distribution.Its value is 1.5mm-3mm.
Slot inclination angle value is 0 °~10 °, and inclination angle is bigger, and axially cutting electric current also increases, coupling loss enhancing.
Then the periodic triangular shape gap of center slot both sides arrangement is determined.Determine the long L value range of triangle base
0.4P-0.5P, triangle base distance center continuity slit centers line 15mm-20mm, adjustment triangular apex side position are
The inclined degree for adjusting axially cutting slot can directly control the transmission loss and coupling loss of leakage cable, according to operating distance and reading
Distance makes appropriate adjustment, and leakage cable is made to reach optimum working performance.
The principle that above each parameter is chosen is: center slot width w value in identified range adjusts w tunable
Relationship between coupling loss and transmission loss；Triangle base is long to essentially dictate the coupling loss of leakage cable；Triangle and center
The relative position in bending type gap directly affects cutting current distribution, therefore appropriate optimal control can achieve coupling loss and biography
Defeated loss is mutually coordinated, obtains the parameter of compromise.
Leakage coaxial cable outer conductor cracks the period in the embodiment above and size can also be adjusted as follows:
Gap sharping is periodically bent on outer conductor 3 becomes 0 °, to form special central line type gap, such as schemes
Shown in 5, this to leak cable more easily processing, is more suitable for producing in batches.
The single triangular slits of bending type gap two sides become overlapping triangular slits on outer conductor 3, as shown in Figure 6.
The triangular slits structure of bending type gap two sides changes into analog-U shaped gap structure on outer conductor 3, as shown in Figure 7.
The structure side of bending type gap two sides is L-type gap structure on outer conductor 3, as shown in Figure 8.
Using the outer conductor slotting structure of structure shown in Fig. 3 as numerical: citing is intended merely to demonstrate here
Above-mentioned implementation method is applied to the design of a coaxial cable, is not offered as the embodiment above and is only applicable in number listed below
According to.
Selection outer conductor outer diameter is 21mm, inner conductor outer diameter 9mm, and the dielectric between internal and external conductor is the poly- second that foams
Its relative dielectric constant 1.26 of alkene；It leaks cable and is applied to hyperfrequency Internet of Things antenna, center operating frequency 915MHz.Selection is cracked
Period P=256mm；Center slot width w=2mm, angle=5 ° of center bending type slot inclination angle, two sides triangular slits
Bottom side length L=113mm, triangle height h=15mm, triangle base distance center clearance distance h1=20mm, triangle top
Point is opposite to sit vertex position m2=24mm.
Simulation model is carried out in HFSS all-wave 3 D electromagnetic design of Simulation software, obtains moving in the axial direction in this structure
Coupling loss at 2m is -46dB (50%) and -50dB (90%).In the Internet of Things reader that power output is 1W, passive mark
The minimum activation power of label is in -14dBm, according to fries transmission formula can calculate the effective reading distance of label is 1.58m.
Its transmission loss is 0.3dB/m, therefore can be calculated and can reach 0.85m to the effective reading distance of label for no reason at all at 15 meters.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (4)
1. a kind of novel leakage cable of internet of things oriented application, which is characterized in that including being led in being sequentially arranged by internal layer outer layers
Body (1), dielectric layer (2), outer conductor (3), insulating protective layer (4), the outer conductor (3) are provided with continuous gap (5), institute along axial direction
The two sides for stating continuous gap (5) are provided with periodical gap (6)；
The continuous gap (5) is wavy bending type gap or linear gap, the period of continuous gap (5) two sides
Property gap (6) interlaced arrangement.
2. the novel leakage cable of internet of things oriented application according to claim 1, which is characterized in that the periodicity gap
It (6) is single triangular slits or multiple triangle sets joint close gaps.
3. the novel leakage cable of internet of things oriented application according to claim 2, which is characterized in that when the periodical gap
(6) be single triangular slits when, gap use the long bevel edge triangular slits of gradual change.
4. the novel leakage cable of internet of things oriented application according to claim 1, which is characterized in that the periodicity gap
It (6) is L-type or U-shaped gap.
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| CN201611081248.0A CN106486783B (en) | 2016-11-30 | 2016-11-30 | The novel leakage cable of internet of things oriented application |
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| CN106486783B true CN106486783B (en) | 2019-06-11 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108390155A (en) * | 2018-04-10 | 2018-08-10 | 中天射频电缆有限公司 | A kind of wide-angle radial leak coaxial cable |
| CN109085177B (en) * | 2018-08-22 | 2022-03-04 | 佳讯飞鸿（北京）智能科技研究院有限公司 | Leaky cable appearance detection method and device based on RFID positioning |
| CN112887990B (en) * | 2020-12-28 | 2023-04-28 | 煤炭科学技术研究院有限公司 | Mining 5G communication base station radio frequency energy loss optimization method and device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710635A (en) * | 2009-12-09 | 2010-05-19 | 北京交通大学 | Leakage coaxial cable based on triangular gap and triangular combination gap |
| CN102356733A (en) * | 2011-08-30 | 2012-02-22 | 绍兴南加大多媒体通信技术研发有限公司 | Green agriculture microwave anti-freezing system |
| CN102395222A (en) * | 2011-11-21 | 2012-03-28 | 苏州迪芬德物联网科技有限公司 | Wireless sensor network constructed by utilizing leaky cable |
| CN203481377U (en) * | 2013-08-30 | 2014-03-12 | 深圳市远望谷信息技术股份有限公司 | Near-field antenna for RFID tag reading and writing |
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2016
- 2016-11-30 CN CN201611081248.0A patent/CN106486783B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710635A (en) * | 2009-12-09 | 2010-05-19 | 北京交通大学 | Leakage coaxial cable based on triangular gap and triangular combination gap |
| CN102356733A (en) * | 2011-08-30 | 2012-02-22 | 绍兴南加大多媒体通信技术研发有限公司 | Green agriculture microwave anti-freezing system |
| CN102395222A (en) * | 2011-11-21 | 2012-03-28 | 苏州迪芬德物联网科技有限公司 | Wireless sensor network constructed by utilizing leaky cable |
| CN203481377U (en) * | 2013-08-30 | 2014-03-12 | 深圳市远望谷信息技术股份有限公司 | Near-field antenna for RFID tag reading and writing |
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