CN107768840A - Application of the both arms Archimedian screw slot antenna in the transmission of microwave wireless electric power - Google Patents

Application of the both arms Archimedian screw slot antenna in the transmission of microwave wireless electric power Download PDF

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Publication number
CN107768840A
CN107768840A CN201710908132.8A CN201710908132A CN107768840A CN 107768840 A CN107768840 A CN 107768840A CN 201710908132 A CN201710908132 A CN 201710908132A CN 107768840 A CN107768840 A CN 107768840A
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CN
China
Prior art keywords
antenna
arms
microwave
archimedian screw
screw slot
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Pending
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CN201710908132.8A
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Chinese (zh)
Inventor
刘程鹏
钟东洲
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Wuyi University
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Wuyi University
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Priority to CN201710908132.8A priority Critical patent/CN107768840A/en
Publication of CN107768840A publication Critical patent/CN107768840A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/104Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces using a substantially flat reflector for deflecting the radiated beam, e.g. periscopic antennas
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01QANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00Circuit arrangements or systems for wireless supply or distribution of electric power
    • H02J50/20Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • H02J50/23Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves characterised by the type of transmitting antennas, e.g. directional array antennas or Yagi antennas

Abstract

The invention discloses application of the both arms Archimedian screw slot antenna in the transmission of microwave wireless electric power, including two both arms Archimedian screw slot antennas, one of both arms Archimedian screw slot antenna is as transmitting antenna, another both arms Archimedian screw slot antenna is as reception antenna, feed is carried out to transmitting antenna to excite, it is allowed to produce an electromagnetic radiation in free space, finally transfer energy to reception antenna, by changing reception antenna anglec of rotation θ size, to study the interaction between transmitting antenna and reception antenna.Beneficial effect of the present invention:The present invention using both arms Archimedian screw slot antenna as microwave wireless electric power transmission in transmitting antenna and reception antenna, layer of metal thin layer copper has also been crossed in the another side of transmitting antenna, 2.45GHz of the frequency selection of antenna in s wave bands, because in this frequency, electromagnetic wave passes through decay during air seldom, it is not affected by the weather, good work can be carried out in rugged environment.

Description

Application of the both arms Archimedian screw slot antenna in the transmission of microwave wireless electric power
Technical field
The present invention relates to microwave wireless electrical power transmission system technical field, especially both arms Archimedian screw slot antenna Application in the transmission of microwave wireless electric power.
Background technology
Helical antenna has good circular polarization characteristics, and helical antenna is also a kind of frequency-independent antenna, meanwhile, helical antenna Or a kind of antenna with ultra wide band characteristic, therefore, it is irreplaceable that this also make it that helical antenna plays in many communications fields Effect, such as electronic countermeasure, directional detection system, aerial and underground target acquisition etc..Archimedian screw slot antenna With the property similar with common Archimedian spiral antenna, because it is easier to loading and lower section, A Ji Mead spiral slit antenna difficulty in terms of miniaturization is less than common Archimedian spiral antenna.
After entering Electrification Age with the mankind, electric energy plays particularly important role in the life of people, promotes The development of human civilization society, however, for a long time, the transmission of electric energy be all by plain conductor contact progress, such as, Electric wire, plug or socket etc., traditional electric energy transmission means there is greatly defect, for example, the mechanical wear of contact point and Phenomena such as aging, can reduce the reliability and security of power supply, and the transmission of electric power can be greatly influenceed in rugged environment.Companion With the fast development of power electronics and relevant control technology, the wireless power transmission technology of highly effective and safe has become possibility.
What wireless power transmission was proposed by " father of wireless power " Nikola Tesla earliest, by energy using electromagnetic wave as matchmaker It is situated between and realizes the transmission of energy, the mode of wireless power transmission is broadly divided into three classes:The first kind:Inductive coupling type wireless power passes Defeated, theoretical based on inductive, operation principle realizes that non-physical connections formula energy transmits similar to transformer.Second class:Couple humorous Formula of shaking wireless power transmission.Based on near-field coupling resonance principle, when the working frequency of receive-transmit system is identical, meet resonant transmission Condition, carry out the non-radiative formula transmission of energy.3rd class:Electromagenetic wave radiation formula wireless power transmission, it can be divided into microwave side again Formula and laser mode, the wireless power transmission of microwave mode carry out wireless energy transfer using electromagnetic radiation, and system is first electric energy The form of microwave is converted into, energy is then delivered to reception antenna from free space by transmitting antenna, finally again by micro- Ripple rectifying device, microwave is converted into electric energy, so as to realize wireless energy transfer, the wireless power transmission technology of laser mode It is to carry out wireless energy transfer using electromagnetic radiation, electric energy passes through laser generator, is converted into laser, and energy is carried by laser, Reception device is transferred to space line, received device is converted into electric energy, is load after finally being handled by the quality of power supply Power supply, the microwave mode of electromagnetic radiation compared to the laser mode of electromagnetic radiation for, have the advantages of more in general, first, it is micro- The efficiency of transmission of ripple mode is higher.Second, microwave mode is safer, protected from environmental smaller.
Energy problem has become a great problem of the world today, continuous growth that the energy will be with world population, money Source demand growing day by day and there is exhausted, and the solar energy that is richly stored with the track away from earth 36000km, it is radiated Intensity is big, continual and steady and clean environment firendly, is the optimal selection for solving world energy sources crisis.Early in the 1970's, american energy Office and space flight NASA just propose solar power satellite plan, propose to establish solar energy plant on geostationary geosynchronous satellite Electric power system, space solar is collected using solar panel and changes into electric energy, then recycles radio Power transmission technology is transported to the earth everywhere.
Therefore, it is necessary to propose that both arms Archimedian screw slot antenna transmits in microwave wireless electric power for above mentioned problem In application.
The content of the invention
For above-mentioned the deficiencies in the prior art, it is an object of the invention to provide both arms Archimedian screw gap Application of the antenna in the transmission of microwave wireless electric power, by changing reception antenna anglec of rotation θ size, to study transmitting antenna Interaction between reception antenna.
Application of the both arms Archimedian screw slot antenna in the transmission of microwave wireless electric power, including two both arms A Ji meter Moral spiral slit antenna, one of both arms Archimedian screw slot antenna is as the transmitting day in the transmission of microwave wireless electric power Line, another both arms Archimedian screw slot antenna is as the reception antenna in the transmission of microwave wireless electric power, with two both arms Microwave energy transmission in space and the rotation when reception antenna are studied in coupling between Archimedian screw slot antenna Distribution map of the electric field when angle, θ changes, feed is carried out to transmitting antenna and excited, allow it to produce an electricity in free space Magnetic radiation, reception antenna is finally transferred energy to, by changing reception antenna anglec of rotation θ size, to study transmitting day Interaction between line and reception antenna.
Preferably, wherein, both arms Archimedian screw slot antenna equation is:
M=Rout-Rin=ρ σ (3)
In formula (1)-(3), RinFor the inside radius of antenna spiral arm, RoutFor the inside radius of antenna spiral arm, R0For For antenna starting point to the distance of origin, ρ is spiral growth rate,For azimuth,For initial angle, σ is the width of spiral arm, M For the width factor of antenna arm.
Preferably, wherein microwave wireless electric power transmission be energy can in the case of no transmission line, by the use of microwave as Medium carries out the transmission of energy.
Preferably, wherein microwave wireless electric power transmission is mainly by microwave transmitter, microwave transmitting antenna, microwave antenna Formed with microwave rectifier circuit, microwave transmitter is the emitting module of microwave wireless electrical power transmission system, is microwave radio signal Generating means, be made up of microwave signal source and power amplifier, it is possible to achieve conversion of the DC voltage to microwave radio energy.
Preferably, the effect of the microwave transmitting antenna is by microwave radio energy transmitting transmission caused by microwave transmitter To reception antenna, microwave antenna is then that the radio-frequency power received is sent into microwave rectifier circuit, then by microwave Rectification circuit, RF energy is converted into DC voltage.
Preferably, it is 3.38 material as day that the both arms Archimedian screw slot antenna, which uses a dielectric constant, The substrate disk of line, the radius of substrate disk is R, and both arms Archimedian screw clearance channel is printed on the one of thin metallic dielectric layer Side, wherein the feed port of both arms Archimedian screw slot antenna is at the center of substrate disk.
Preferably, the radius R of the substrate disk is 55mm, the height h=2mm of substrate disk, between adjacent two-arm Spacing σ=1.5mm, the dielectric constant of substrate disk is 3.38, the inside radius R of antenna spiral armin=48.6mm, both arms A Ji meter The outer radius R of the spiral arm of moral spiral slit antennaout=50.1mm, R0=0.5mm, both arms Archimedian screw slot antenna Spiral growth rate ρ be 1.5.
Preferably, the spacing between two of which both arms Archimedian screw slot antenna is 300mm.
Preferably, one layer of gold has been plated in the another side of the transmitting antenna of other in which both arms Archimedian screw slot antenna Belong to thin layer copper.
Preferably, 2.45GHz of two both arms Archimedian screw slot antenna working frequency selections in s wave bands.
Due to using above-mentioned technical proposal, beneficial effect of the present invention:The present invention utilizes both arms Archimedian screw gap day Line has also crossed layer of metal as transmitting antenna and reception antenna in the transmission of microwave wireless electric power in the another side of transmitting antenna Thin layer copper, it is therefore an objective to play a reflector, the working frequency of both arms Archimedian screw slot antenna is selected in s ripples The 2.45GHz of section, because in this frequency, electromagnetic wave passes through decay during air seldom, is not affected by the weather, can be severe Good work is carried out in environment, is a more satisfactory frequency.
Brief description of the drawings
Fig. 1-1 is the front view of both arms Archimedian screw slot antenna configurations;
Fig. 1-2 is the side view of both arms Archimedian screw slot antenna configurations;
Fig. 1-3 is the structural representation of both arms spiral of Archimedes;
Fig. 2 is respectively as transmitting antenna and reception antenna with two identical both arms Archimedian screw slot antennas Schematic diagram;
Fig. 3 is the simplified basic diagram of microwave wireless electrical power transmission system;
Fig. 4 be single both arms Archimedian screw slot antenna when s wave bands, frequency and return loss (s11) it Between graph of a relation;
Fig. 5 is three-dimensional radiation directional diagram of the single both arms Archimedian screw slot antenna in 2.45GHz;
When a thin metal layer on the left of the disk in single both arms Archimedian screw slot antenna being present in Fig. 6, Three-dimensional radiation directional diagram of the antenna in 2.45GHz;
Fig. 7 is when x=0mm, distribution map of the electric field of the single both arms Archimedian screw slot antenna in yoz planes;
Fig. 8 is 0 degree, z=0mm when the rotation angle θ of reception antenna, the electric field point of xoy plane of the frequency in 2.45GHz Butut;
Fig. 9 is when anglec of rotation θ=0 degree of reception antenna, the graph of a relation between frequency and S21.
Embodiment
Embodiments of the invention are described in detail below in conjunction with accompanying drawing, but the present invention can be defined by the claims Implement with the multitude of different ways of covering.
Such as Fig. 1 and with reference to shown in Fig. 2-Fig. 9, both arms Archimedian screw slot antenna is in the transmission of microwave wireless electric power Using, including two both arms Archimedian screw slot antennas, one of both arms Archimedian screw slot antenna is as micro- Transmitting antenna in ripple wireless power transmission, another both arms Archimedian screw slot antenna transmit as microwave wireless electric power In reception antenna, study microwave energy in space with the coupling between two both arms Archimedian screw slot antennas Transmission and the distribution map of the electric field when anglec of rotation θ of reception antenna changes, carry out feed to transmitting antenna and excite, allow It produces an electromagnetic radiation in free space, reception antenna is finally transferred energy to, by changing the reception antenna anglec of rotation θ size is spent, to study the interaction between transmitting antenna and reception antenna.
Further, wherein, both arms Archimedian screw slot antenna equation is:
M=Rout-Rin=ρ σ (3)
In formula (1)-(3), RinFor the inside radius of antenna spiral arm, RoutFor the inside radius of antenna spiral arm, R0For For antenna starting point to the distance of origin, ρ is spiral growth rate,For azimuth,For initial angle, σ is the width of spiral arm, M For the width factor of antenna arm.Wherein microwave wireless electric power transmission is that energy can use microwave in the case of no transmission line The transmission of energy is carried out as medium.
Wherein microwave wireless electric power transmission is mainly by microwave transmitter, microwave transmitting antenna, microwave antenna and microwave Rectification circuit is formed, and microwave transmitter is the emitting module of microwave wireless electrical power transmission system, is the generation of microwave radio signal Device, it is made up of microwave signal source and power amplifier, it is possible to achieve conversion of the DC voltage to microwave radio energy.
Further, the effect of the microwave transmitting antenna is to pass microwave radio energy transmitting caused by microwave transmitter Defeated to arrive reception antenna, microwave antenna is then that the radio-frequency power received is sent into microwave rectifier circuit, then by micro- Ripple rectification circuit, RF energy is converted into DC voltage, the both arms Archimedian screw slot antenna uses a dielectric Substrate disk of the material that constant is 3.38 as antenna, the radius of substrate disk is R, and both arms Archimedian screw clearance channel prints Brush in the side of thin metallic dielectric layer, wherein the feed port of both arms Archimedian screw slot antenna is at the center of substrate disk Place.
Wherein, the radius R of the substrate disk is 55mm, the height h=2mm of substrate disk, between adjacent two-arm between Away from σ=1.5mm, the dielectric constant of substrate disk is 3.38, the inside radius R of antenna spiral armin=48.6mm, both arms Archimedes The outer radius R of the spiral arm of spiral slit antennaout=50.1mm, R0=0.5mm, both arms Archimedian screw slot antenna Spiral growth rate ρ is 1.5.
Spacing between two of which both arms Archimedian screw slot antenna is 300mm, other in which both arms A Ji Layer of metal thin layer copper, two both arms Archimedian screw gaps are plated in the another side of the transmitting antenna of Mead spiral slit antenna Operating frequency of antenna selects the 2.45GHz in s wave bands.
In case study on implementation
As shown in figure 1, the parameter distribution of both arms Archimedian screw slot antenna configurations is as follows:The half of substrate disk Footpath R is 55mm, the height h=2mm of substrate disk, spacing σ=1.5mm between adjacent two-arm, the dielectric constant of substrate disk For 3.38, the inside radius R of antenna spiral armin=48.6mm, the outer radius R of antenna spiral armout=50.1mm, R0=0.5mm, Spiral growth rate ρ is 1.5.Fig. 2 is given with two identical both arms Archimedian screw slot antennas respectively as transmitting day The schematic diagram of line and reception antenna, wherein, d 300mm, in order to allow the radiation of transmitting antenna to concentrate on one side, therefore, launching Layer of metal thin layer copper has also been crossed in the another side of antenna, it is therefore an objective to plays a reflector.By both arms Archimedian screw The working frequency selection of slot antenna is in the 2.45GHz of s wave bands, because in this frequency, decay when electromagnetic wave passes through air is very It is few, it is not affected by the weather, good work can be carried out in rugged environment, is a more satisfactory frequency.
As a result with analysis:By constantly research and analysis, single both arms A Ji meter of the working frequency in s wave bands has been drawn The certain physical characteristics of moral spiral slit antenna, such as return loss (S11), three-dimensional antenna pattern and both arms Archimedes The surface electric field distribution figure of spiral slit antenna, as Figure 4-Figure 6, it is recognised that single both arms Archimedian screw from Fig. 4 Slot antenna has S11 < -10dB in whole frequency range, so, the both arms Archimedian screw slot antenna has good Good impedance matching, Fig. 5 and Fig. 6 are indicated, and thin metal layer serves the effect of a reflector, the radiation on disk one side Other one side is reflexed to, this thinking designed with us is matched, and Fig. 7 is indicated in single both arms Archimedian screw gap In the upper surface of antenna, the electric-field intensity in gap is greater than other local electric-field intensity.Fig. 8 gives reception antenna Rotation angle θ is 0 degree, z=0mm, the distribution map of the electric field of xoy plane of the frequency in 2.45GHz, and Fig. 9 is given when reception day When anglec of rotation θ=0 degree of line, the graph of a relation between frequency and S21, table 1 is given when frequency is in 2.45GHz Wait, the relation between the anglec of rotation θ and S21.
Table .1
Rotation angle θ (degree) 0 18 36 54 72 90
S21(dB) -33.3 -33.4 -34.2 -35.9 -38.8 -42.9
The present invention using both arms Archimedian screw slot antenna as microwave wireless electric power transmission in transmitting antenna with Reception antenna, layer of metal thin layer copper is also crossed in the another side of transmitting antenna, it is therefore an objective to play a reflector, will be double The working frequency of arm Archimedian screw slot antenna selects the 2.45GHz in s wave bands, because in this frequency, electromagnetic wave passes through Decay during air is seldom, is not affected by the weather, and good work can be carried out in rugged environment, is one more satisfactory Frequency.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the scope of the invention, every utilization The equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations Technical field, be included within the scope of the present invention.

Claims (10)

1. application of the both arms Archimedian screw slot antenna in the transmission of microwave wireless electric power, it is characterised in that:Including two Both arms Archimedian screw slot antenna, one of both arms Archimedian screw slot antenna transmit as microwave wireless electric power In transmitting antenna, another both arms Archimedian screw slot antenna as microwave wireless electric power transmit in reception antenna, Microwave energy transmission in space is studied with the coupling between two both arms Archimedian screw slot antennas and when receiving The distribution map of the electric field when anglec of rotation θ of antenna changes, feed is carried out to transmitting antenna and excited, allows it in free space An electromagnetic radiation is produced, finally transfers energy to reception antenna, by changing reception antenna anglec of rotation θ size, is come Study the interaction between transmitting antenna and reception antenna.
2. application of the both arms Archimedian screw slot antenna according to claim 1 in the transmission of microwave wireless electric power, It is characterized in that:Wherein, both arms Archimedian screw slot antenna equation is:
M=Rout-Rin=ρ σ (3)
In formula (1)-(3), RinFor the inside radius of antenna spiral arm, RoutFor the inside radius of antenna spiral arm, R0For antenna For starting point to the distance of origin, ρ is spiral growth rate,For azimuth,For initial angle, σ is the width of spiral arm, and M is day The width factor of line arm.
3. application of the both arms Archimedian screw slot antenna according to claim 1 in the transmission of microwave wireless electric power, It is characterized in that:Wherein microwave wireless electric power transmission is that energy can be used as medium in the case of no transmission line by the use of microwave To carry out the transmission of energy.
4. application of the both arms Archimedian screw slot antenna according to claim 3 in the transmission of microwave wireless electric power, It is characterized in that:Wherein the transmission of microwave wireless electric power is mainly by microwave transmitter, microwave transmitting antenna, microwave antenna and micro- Ripple rectification circuit is formed, and microwave transmitter is the emitting module of microwave wireless electrical power transmission system, is the hair of microwave radio signal Generating apparatus, it is made up of microwave signal source and power amplifier, it is possible to achieve conversion of the DC voltage to microwave radio energy.
5. application of the both arms Archimedian screw slot antenna according to claim 4 in the transmission of microwave wireless electric power, It is characterized in that:The effect of the microwave transmitting antenna is to be transferred to microwave radio energy transmitting caused by microwave transmitter to connect Antenna is received, microwave antenna is then that the radio-frequency power received is sent into microwave rectifier circuit, then by microwave rectification Circuit, RF energy is converted into DC voltage.
6. application of the both arms Archimedian screw slot antenna according to claim 1 in the transmission of microwave wireless electric power, It is characterized in that:It is 3.38 material as antenna that the both arms Archimedian screw slot antenna, which uses a dielectric constant, Substrate disk, the radius of substrate disk is R, and both arms Archimedian screw clearance channel is printed on the side of thin metallic dielectric layer, its The feed port of middle both arms Archimedian screw slot antenna is at the center of substrate disk.
7. application of the both arms Archimedian screw slot antenna according to claim 6 in the transmission of microwave wireless electric power, It is characterized in that:The radius R of the substrate disk is 55mm, the height h=2mm of substrate disk, the spacing σ between adjacent two-arm =1.5mm, the dielectric constant of substrate disk is 3.38, the inside radius R of antenna spiral armin=48.6mm, both arms Archimedes's spiral shell Revolve the outer radius R of the spiral arm of slot antennaout=50.1mm, R0=0.5mm, the spiral shell of both arms Archimedian screw slot antenna It is 1.5 to revolve growth rate ρ.
8. application of the both arms Archimedian screw slot antenna according to claim 6 in the transmission of microwave wireless electric power, It is characterized in that:Spacing between two of which both arms Archimedian screw slot antenna is 300mm.
9. application of the both arms Archimedian screw slot antenna according to claim 6 in the transmission of microwave wireless electric power, It is characterized in that:It is thin that layer of metal has been plated in the another side of the transmitting antenna of other in which both arms Archimedian screw slot antenna Layer copper.
10. application of the both arms Archimedian screw slot antenna according to claim 1 in the transmission of microwave wireless electric power, It is characterized in that:2.45GHz of two both arms Archimedian screw slot antenna working frequency selections in s wave bands.
CN201710908132.8A 2017-09-29 2017-09-29 Application of the both arms Archimedian screw slot antenna in the transmission of microwave wireless electric power Pending CN107768840A (en)

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CN109755753A (en) * 2019-01-11 2019-05-14 东南大学 Archimedian screw shape frequency-selective surfaces
CN109917250A (en) * 2019-04-04 2019-06-21 华北电力大学(保定) Detect the multifrequency point wide frequency antenna and its design method of local discharge of electrical equipment
CN110364812A (en) * 2019-07-31 2019-10-22 歌尔股份有限公司 A kind of circular polarized antenna and test macro for product test
CN113675594A (en) * 2021-07-06 2021-11-19 北京交通大学 High-efficiency leaky-wave antenna

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109755753A (en) * 2019-01-11 2019-05-14 东南大学 Archimedian screw shape frequency-selective surfaces
CN109755753B (en) * 2019-01-11 2020-11-24 东南大学 Archimedes spiral frequency selective surface
CN109917250A (en) * 2019-04-04 2019-06-21 华北电力大学(保定) Detect the multifrequency point wide frequency antenna and its design method of local discharge of electrical equipment
CN109917250B (en) * 2019-04-04 2021-04-23 华北电力大学(保定) Multi-frequency-point broadband antenna for detecting partial discharge of electrical equipment and design method thereof
CN110364812A (en) * 2019-07-31 2019-10-22 歌尔股份有限公司 A kind of circular polarized antenna and test macro for product test
CN110364812B (en) * 2019-07-31 2020-11-10 歌尔股份有限公司 Circularly polarized antenna for product test and test system
CN113675594A (en) * 2021-07-06 2021-11-19 北京交通大学 High-efficiency leaky-wave antenna

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Application publication date: 20180306