CN100388559C - Self-reconstruction plasma antenna - Google Patents
Self-reconstruction plasma antenna Download PDFInfo
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- CN100388559C CN100388559C CNB2005101122191A CN200510112219A CN100388559C CN 100388559 C CN100388559 C CN 100388559C CN B2005101122191 A CNB2005101122191 A CN B2005101122191A CN 200510112219 A CN200510112219 A CN 200510112219A CN 100388559 C CN100388559 C CN 100388559C
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Abstract
The present invention relates to a self-reconstruction plasma antenna, which is used in the technical field of communication. The present invention comprises a column-shaped container, inert gases, a radio frequency excitation antenna, a radio frequency excitation source, a signal coupler, a feeding port and an earth plate. The present invention is characterized in that the inner part of the column-shaped container is filled with the inert gases; the radio frequency excitation source and the radio frequency excitation antenna are used for exciting and maintaining plasmas; the radio frequency excitation antenna is arranged on the inner part or the outer part of the column-shaped container; a leading wire of the column-shaped container radio frequency excitation antenna is connected with the radio frequency excitation source; the signal coupler is used for coupling signals onto the present invention and is arranged on the outer part of the column-shaped container; a leading wire of the signal coupler is connected with an inner conductor of the feeding port; an outer conductor of the feeding port is connected with the ground plate. The present invention has the advantages of light weight, simple structure, easy self-reconstruction, low mutual interference, etc. and overcomes a series of defects that a metal conductor antenna has the disadvantages of large scattering area and high mutual interference and the length the metal conductor antenna which can not be electrically adjusted, etc.
Description
Technical field
What the present invention relates to is a kind of antenna that is used for communication technical field, especially a kind of self-reconstruction plasma antenna.
Background technology
Traditional antenna is defined as being used to transmit and receive the metal device of radio wave, or has the metallic conductor of definite shape and structure.Therefore, the characteristic of geometry, physical size, metal material selection, electrical couplings structure, many Antenna Design and/or the electromagnetic waveforms of antenna is all paid attention in the design of antenna in the past, the transmission wavelength when for example antenna is worked, efficiency of transmission, transmitted waveform reflection or the like.The size of antenna and its radiation efficiency are closely related.In order as far as possible efficiently energy emission to be gone out, the length of antenna is generally half-wavelength or quarter-wave.On this meaning, with the antenna of metal, in case size has determined that its frequency range that can work has just been determined as conductor.In order to obtain different operating frequencies, must change the length of antenna conductor, for example telescopic antenna.But the antenna of this structure can't realize that the structure that electricity is regulated or electricity is regulated of length is too complicated, thereby influences the performance of antenna.Recently, people begin showing great interest with plasma as the antenna of conductor.In fact, than traditional metal antenna, it is more flexible and changeable that plasma antenna can be designed to be.For example, the radiance of plasma antenna can be controlled by multiple means, comprise plasma density, plasma structure of container, gas type, add magnetostatic field and exciting current or the like.
Find that through document U.S. Pat 6710746 has proposed a kind of antenna that can regulate based on the length of plasma to prior art.This patent with current excitation, the uneven plasma column of sectional area is as antenna, when changing exciting current big or small, uneven sectional area causes uneven current density, thereby obtains the plasma of different length.But because the radiation of antenna is to be produced by the surface of conductors electric current as antenna, the inhomogeneities of the discontinuity of antenna surface and the sectional area of antenna own can influence the performances such as efficient, lobe pattern, directivity of radiation to a great extent.So if plasma column that can uniform cross-section is long-pending will be greatly improved radiation efficiency, lobe pattern, the directivity of antenna and the ability that reconfigures as the conductor of antenna.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art and defective, a kind of self-reconstruction plasma antenna be provided, make its have uniform cross-section long-pending, with plasma as conductor, have characteristics from the reconstruct ability.The present invention is in light weight, simple in structure, be easy to from reconstruct, lowly disturb mutually, when plasma is not excited, can form scatterings to other electromagnetic waves of incident, thereby use the stealth that can realize radar wave in army; On civilian, can reduce disturbing mutually between the antenna element.The present invention is by changing the length of plasma column, and obtaining length can the electric antenna of regulating.This antenna overcome the area of metallic conductor antenna scattering in the past disturb greatly, mutually height, length can't the electricity adjusting etc. a series of shortcomings.
The present invention is achieved by the following technical solutions, the present invention includes: cylindrical container, inert gas, RF excited antenna, RF excited source, signal coupler, feed port, ground plate.Blanketing gas in the cylindrical container can form plasma behind gas ionization, the interior plasma column of cylindrical container this moment promptly can be used as the conductor of antenna, emission or reception electromagnetic wave.RF excited source and RF excited antenna are used to excite and keep plasma, and the RF excited antenna is placed on the inside or the outside of cylindrical container, and its lead-out wire connects the RF excited source.When work in the RF excited source, will produce radio frequency spiral electric field around the RF excited antenna, the gas in the cylindrical container can excite and form plasma under the spiral effect of electric field.Change the power output in RF excited source, just can change the size of spiral electric field, thereby change the length of plasma column in the container.Signal coupler is used to couple a signal to plasma antenna, is placed on the outside of cylindrical container, and its lead-out wire links to each other with the inner wire of feed port.The outer conductor of feed port links to each other with ground plate.
The cross-sectional area of cylindrical container is uniformly vertically, the inner inert gas of filling.After ionized inert gas becomes plasma, can regard conductor as.As antenna, in when work, electric current that its surface produces is even and continuous with this even conductor, this just can so that the radiation efficiency of antenna than being improved significantly under the uneven situation of cross-sectional area.The length of cylindrical container has determined the maximum functional length of antenna, and during the complete ionization of internal tank gas, the operation wavelength of antenna is the longest.When in the container during gas partial ionization, the length of the plasma column that ionized gas forms is exactly the active length of antenna.Single cylindrical container can be formed whip shape self-reconstruction plasma antenna, two cylindrical containers can be formed the self-reconstruction plasma doublet antenna in conjunction with corresponding feed system, and a plurality of cylindrical containers can be formed the self-reconstruction plasma antenna array in conjunction with corresponding feed system.
The RF excited antenna is multiturn coil or ring.The RF excited source is the radio frequency power source of 500W, and its output energy is adjustable continuously.The RF excited source produces the radio-frequency voltage of 13.5MHz, is connected to the RF excited antenna by lead-in wire, produces radio-frequency current on the RF excited antenna.The RF excited antenna produces the spiral electric field, and under effect of electric field, gas can ionization form plasma.In order further to improve axial uniformity, adopt a plurality of active antennas (distributed excitation), these RF excited antennas can in parallel or series connection, and is placed on different positions.When parallel connection, can control the RF excited antenna and work simultaneously or work alone.By changing the power output in RF excited source, change the RF excited antenna number of work when in parallel, just can change the length of plasma column.
Signal coupler is the endless metal with certain width, is placed on external container, and the inner wire of feed port links to each other with signal coupler, and outer conductor links to each other with ground plate.Under this structure, the signal coupled modes between signal coupler and the plasma column are capacitive coupling (CCP).
The present invention compares with prior art, and its effect is remarkable and outstanding.The present invention is because of the conductor of using plasma as antenna, and suppressing antenna disturbing mutually when work eliminated the radar scattering problem of antenna when not working effectively.Simultaneously, using plasma, can obtain better from the reconstruct ability by changing density, the kind of gas as the antenna of conductor.The present invention excites and keeps plasma by adopting the RF excited antenna, the method of this generation plasma is commonly referred to TCP (transformer coupled), the plasma of its generation, compare with the plasma that traditional two ends encourage glow discharge to produce, have low-down noiseproof feature, thereby make plasma application become possibility in field of antenna.The method that adopts Distributed T CP (transformer coupled) excitation is than monocycle coupling (CCP, capacitive coupling) Ji Li method can obtain better axially uniformity, and under the situation of parallel connection, can independently control the switch of active antenna, obtain more flexibly from the reconstruct allocative abilities.By changing the power output in RF excited source, can change the length of plasma column very easily, thereby make antenna have length from the reconstruct ability.By changing the plasma column length of individual antenna unit in the aerial array, perhaps change the switch of antenna element in the aerial array, can obtain to have length from reconstruct and array element aerial array from the reconstruct ability.
Description of drawings
Fig. 1 is the structure chart of whip shape self-reconstruction plasma antenna of the present invention.
Fig. 2 is the structure chart of the two oscillator shape self-reconstruction plasma antennas of the present invention.
The structure chart of the four element antenna arrays that Fig. 3 is made up of whip shape self-reconstruction plasma antenna.
Among the figure, cylindrical container 1, inert gas 2, RF excited antenna 3, RF excited source 4, signal coupler 5, feed port 6, ground plate 7.
Embodiment
As shown in Figure 1, the present invention includes: cylindrical container 1, inert gas 2, RF excited antenna 3, RF excited source 4, signal coupler 5, feed port 6, ground plate 7.The cylindrical container 1 interior inert gas 2 of filling can form plasma behind gas ionization, the interior plasma column of cylindrical container this moment promptly can be used as the conductor of antenna, emission or reception electromagnetic wave.RF excited source 4 and RF excited antenna 3 are used to excite and keep plasma, and RF excited antenna 3 is placed on the inside or the outside of cylindrical container, and its lead-out wire connects RF excited source 4.When work in RF excited source 4, will produce radio frequency spiral electric field around the RF excited antenna 3, the gas in the cylindrical container 1 can excite and form plasma under the spiral effect of electric field.Change the power output in RF excited source 4, just can change the size of spiral electric field, thereby change the length of plasma column in the container.Signal coupler 5 is used to couple a signal to plasma antenna, is placed on the outside of cylindrical container 1, and its lead-out wire links to each other with the inner wire of feed port 6.The outer conductor of feed port 6 links to each other with ground plate 7.
Described cylindrical container 1 is the container of a long straight shape, and cross-sectional area is uniformly vertically, adopts glass material, can retrain inner inert gas 2 and form plasma.The sectional area of this container is circular.Be filled with inert gas 2 in cylindrical container 1 inside, can form plasma after discharge, comprise argon gas, neon, helium, krypton gas, xenon, in addition, the metal vapors of the back formation plasma that can discharge for example mercury vapor also can be used.
Described RF excited antenna 3 is a multiturn coil, is made up of red copper or other lead/conduit with good conductive ability, also can be made up of the flat red copper with certain width or other conduction band with good conductive ability.RF excited antenna 3 can be made up of a coil, also can be made up of a plurality of coil serial or parallel connections, is placed on the position near the end.
RF excited antenna 3 can be placed on the outside of cylindrical container 1, also can be placed on its inside.When being placed on the outside, the internal diameter of RF excited antenna 3 is slightly larger than the external diameter of cylindrical container 1; When being placed on inside, the external diameter of RF excited antenna 3 is slightly less than the internal diameter of cylindrical container 1.RF excited source 4 connects the lead-out wire of RF excited antenna 3.The radio-frequency voltage that is produced by RF excited source 4 is converted into the radio-frequency current on the RF excited antenna 3, and the spiral electric field that produced by radio-frequency current can excite and keep cylindrical container 1 inside
Fig. 2 is the self-reconstruction plasma antenna of another kind of form.Form by two white reconstruct plasma antennas of the present invention, promptly comprise 1, two RF excited antenna of two cylindrical containers 3, two RF excited sources 4, two signal couplers 5, feed port 6 are formed.Two cylindrical container 1 horizontal positioned, the end is relative, constitutes a doublet antenna.Internal tank is filled the inert gas 2 of same type, air pressure.Two RF excited antennas 3 are positioned over the position of cylindrical container 1 near the end respectively symmetrically, and the lead-out wire of RF excited antenna 3 connects RF excited source 4.When changing the power output in RF excited source 4, the degree of ionization of two cylindrical container 1 inner inert gases 2 of change that can be synchronous, thus produce the conductor that length changes synchronously.Two signal couplers 5 are positioned over the position of cylindrical container 1 near the end respectively symmetrically, and the structure of signal coupler 5 as previously mentioned.The inner wire of feed port 6 connects the lead-out wire of a signal coupler 5, and outer conductor connects the lead-out wire of another signal coupler 5, so constitutes a self-reconstruction plasma doublet antenna.
Fig. 3 is an array that is formed by four self-reconstruction plasma antennas of the present invention.This array can carry out from reconstruct under the control of central control unit 8, thereby obtains the configuration of multiple aerial array.For example,
Can optionally close wherein several antenna elements, only open the antenna element of ad-hoc location.This can obtain by the energy that control RF excited source 4 is input to cylindrical container 1.Can also be input to the energy size of cylindrical container 1 by control, change the length of plasma column, thereby change the length of individual antenna unit, reach the purpose that changes the antenna element resonance frequency.Can also carry out controlled change to the resonance frequency of number of unit and unit cell arrangement and individual unit simultaneously in conjunction with above-mentioned two kinds of methods, thus antenna parameters such as the resonance frequency that acquisition needs, radiation lobe figure, directivity.
Claims (9)
1. self-reconstruction plasma antenna, comprise: cylindrical container (1), RF excited antenna (3), RF excited source (4), signal coupler (5), feed port (6), ground plate (7), it is characterized in that, cylindrical container (1) is the container of a long straight shape, cross-sectional area is uniform vertically, the interior inert gas (2) of filling, or the back of can discharging forms the metal vapors of plasma, RF excited source (4) and RF excited antenna (3) are used to excite and keep plasma, RF excited antenna (3) is placed on the inside or the outside of cylindrical container, RF excited antenna (3) lead-out wire connects RF excited source (4), signal coupler (5) is used to couple a signal to plasma antenna, be placed on the outside of cylindrical container (1), signal coupler (5) lead-out wire links to each other with the inner wire of feed port (6), and the outer conductor of feed port (6) links to each other with ground plate (7).
2. self-reconstruction plasma antenna according to claim 1 is characterized in that, described cylindrical container (1) adopts glass material, can retrain inner inert gas (2) and form plasma.
3. self-reconstruction plasma antenna according to claim 1 is characterized in that, described RF excited antenna (3) is a multiturn coil, is made up of the lead/conduit with good conductive ability, or is made up of the conduction band with good conductive ability.
4. self-reconstruction plasma antenna according to claim 1 is characterized in that, described RF excited antenna (3) is made up of a coil, or is made up of a plurality of coil serial or parallel connections, is placed on the position near cylindrical container (1) end.
5. according to claim 1 or 3 described self-reconstruction plasma antennas, it is characterized in that, described RF excited antenna (3) is placed on the inside or the outside of cylindrical container, and when being placed on the outside, the internal diameter of RF excited antenna (3) is greater than the external diameter of cylindrical container (1); When being placed on inside, the external diameter of RF excited antenna (3) is less than the internal diameter of cylindrical container (1).
6. self-reconstruction plasma antenna according to claim 1, it is characterized in that, the operating frequency in described RF excited source (4) is 13.5MHz, its power output is that 500W is adjustable continuously, by changing power output, and change the active antenna number of work during for parallel form at RF excited antenna (3), can change the ionisation of gas degree, thus obtain that length can electricity regulates from the reconstruct antenna element.
7. according to claim 1 or 6 described self-reconstruction plasma antennas, it is characterized in that, when the power output of RF excited source (4) was changed from small to big, it be from spreading to the end away from the cylindrical container (1) of RF excited antenna (3) near the end of the cylindrical container (1) of RF excited antenna (3) that cylindrical container (1) gas inside length increases direction.
8. self-reconstruction plasma antenna according to claim 1 is characterized in that, signal coupler (5) is an endless metal, is made by thin flat sheet of metal, and signal coupler (5) internal diameter is greater than the external diameter of cylindrical container (1).
9. self-reconstruction plasma antenna according to claim 1 is characterized in that, feed port (6) is used to connect emittor/receiver.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005101122191A CN100388559C (en) | 2005-12-29 | 2005-12-29 | Self-reconstruction plasma antenna |
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| CNB2005101122191A CN100388559C (en) | 2005-12-29 | 2005-12-29 | Self-reconstruction plasma antenna |
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| CN100388559C true CN100388559C (en) | 2008-05-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101431182B (en) * | 2008-12-17 | 2012-09-05 | 清华大学 | Reconfigurable antenna used for mobile terminal |
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| CN101286587B (en) * | 2008-05-27 | 2012-01-11 | 南京航空航天大学 | Yagi antenna of electric-controlled plasma |
| CN101938035B (en) * | 2010-07-15 | 2013-10-30 | 华南理工大学 | Array plasma antenna with omni-directional scanning function |
| CN104466406A (en) * | 2014-12-10 | 2015-03-25 | 上海交通大学 | Plasma-based electric phase modulation surface antenna |
| CN106025546B (en) * | 2016-05-25 | 2019-03-08 | 哈尔滨工业大学 | The device of using plasma modulation enhancing miniaturization omni-directional antenna electromagnetic radiation |
| CN106647330B (en) * | 2016-12-23 | 2019-09-17 | 核工业西南物理研究院 | A kind of Plasma shape real-time reconstructing system and method applied to tokamak |
| FR3062770B1 (en) * | 2017-02-06 | 2019-03-29 | Polygon Physics | SOURCE OF PLASMA |
| CN106898861A (en) * | 2017-03-01 | 2017-06-27 | 合肥工业大学 | A kind of plasma antenna for working in Terahertz frequency range |
| CN109168244B (en) * | 2018-10-24 | 2021-03-09 | 中国科学院国家空间科学中心 | Preparation method of ionization cavity based on plasma antenna |
| CN111952736B (en) * | 2020-07-30 | 2023-05-26 | 中国科学院国家空间科学中心 | Extensible controllable plasma excitation power source |
| CN111969337B (en) * | 2020-07-30 | 2023-05-12 | 中国科学院国家空间科学中心 | Control method of extensible controllable plasma excitation power source |
| CN113314852A (en) * | 2021-05-25 | 2021-08-27 | 上海交通大学 | Plasma modulator and electromagnetic wave vector microscopic sensor |
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| US6369763B1 (en) * | 2000-04-05 | 2002-04-09 | Asi Technology Corporation | Reconfigurable plasma antenna |
| US20030193436A1 (en) * | 2002-04-12 | 2003-10-16 | Anderson Theodore R. | Confined plasma resonance antenna and plasma resonance antenna array |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101431182B (en) * | 2008-12-17 | 2012-09-05 | 清华大学 | Reconfigurable antenna used for mobile terminal |
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