CN101728651B - Plasma directional scanning antenna - Google Patents
Plasma directional scanning antenna Download PDFInfo
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- CN101728651B CN101728651B CN 200910243956 CN200910243956A CN101728651B CN 101728651 B CN101728651 B CN 101728651B CN 200910243956 CN200910243956 CN 200910243956 CN 200910243956 A CN200910243956 A CN 200910243956A CN 101728651 B CN101728651 B CN 101728651B
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- vacuum chamber
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- scanning antenna
- directional scanning
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Abstract
The invention provides a plasma directional scanning antenna, which comprises a vacuum chamber. Cathodes and anodes which correspond to each other are arranged in the vacuum chamber; magnet field generating equipment is arranged outside the vacuum chamber; a plurality of plasma sheets are formed in the vacuum chamber; the cathodes are a plurality of cathode groups which are intersected at the same end point and positioned on the same horizontal plane; the cathode groups are connected to a plurality of high-voltage excitation power supplies through a group of fast transfer switches; the fast transfer switches control the fast switching of the plurality of plasma sheets; in included angles, the maximum flare angle between two cathodes is 90 degrees, and the other included angles of the plurality of cathodes can be uniformly or non-uniformly distributed in the range of 90 degrees so as to realize 180-degree radiation to incident electromagnetic waves; the high-voltage power supplies are used for driving the plasma sheets to work; and the transfer switches comprise a control system and a plurality of IGBT modules. The plasma directional scanning antenna can selectively reflect the electromagnetic waves with different frequencies, and can be directly used as a 180-degree directional scanning antenna by changing the reflection of the electromagnetic waves in 180-degree space in an electrically switching mode.
Description
Technical field
The present invention relates to plasma field, radio field, particularly a kind of plasma directional scanning antenna.
Background technology
At present, the scanning direction antenna of radio communication all adopts the electromagnetic wave of a certain fixed frequency range of metal covering reflection incident, and this antenna just can only reflect the electromagnetic wave of a certain fixed frequency range once making, if want to change the reflected wave frequency range coverage of this antenna, be impossible.
(number of patent application: 200910238463.0) provide a kind of device for reflection of electromagnetic waves, this device utilizes plasma technique to produce plasma sheet as electromagnetic reflecting surface to patent " a kind of device for reflection of electromagnetic waves ", realizes reflection of electromagnetic wave; This device for reflection of electromagnetic waves comprises: a vacuum chamber 3 is provided with a target 2 and anode 1, negative electrode 2 and anode 1 external excitation power supply in the vacuum chamber 3; Vacuum chamber is provided with magnetic field generating apparatus 4 outward, for generation of the axial magnetic field perpendicular to negative electrode and positive electrode.Density with plasma is different, and this plasma sheet has reflex to the electromagnetic wave of different frequency.This has installed successful realization with the reflecting surface of plasma sheet as certain frequency range, by regulating the density of plasma sheet, can realize the different frequency electromagnetic wave is reflected, but a negative electrode can only form a slice plasma reflecting surface, this device can not directly apply to the scanning direction antenna, thereby electromagnetic wave is carried out radiation to the space of appointment.
Summary of the invention
The object of the invention is to, the scheme of doing reflector antenna for overcoming existing plasma sheet can not realize the problems such as scanning direction, thereby proposes a kind of plasma omnidirectional scanning antenna.
For this reason, the present invention proposes a kind of plasma directional scanning antenna, this antenna utilizes plasma technique to produce plasma sheet, described plasma sheet is as electromagnetic reflecting surface, with the electromagnetic wave of primary irradiation antenna transmission, the plasma sheet reflection with switching fast is radiated the space, realize reflection of electromagnetic wave, form the rapid scanning of wave beam.Under the control of diverter switch, be in the plasma sheet alternation of different directions, so that electromagnetic wave directive different directions can be realized the electromagnetic wave beam scanning of 180 degree.
For realizing this purpose, the present invention proposes a kind of directional scanning antenna of plasma, and this device comprises: a vacuum chamber, described vacuum chamber inner cathode and anode; Vacuum chamber is provided with magnetic field generating apparatus outward, in vacuum chamber, form plasma sheet, it is characterized in that, described negative electrode is some cathode sets that intersect at same end points and be positioned at the same level face, described cathode sets is connected to some high voltage excitation power supplies by one group of quick diverter switch, controls the quick switching of some plasma sheets by this diverter switch.
As a kind of improvement of the present invention, described angle, by two negative electrodes that maximum subtended angle is 90 degree are set, what all the other some negative electrodes can be even or inhomogeneous is distributed in this 90 degree angular range, realizes 180 degree radiation to incident electromagnetic wave.
As another improvement of the present invention, described diverter switch comprises:
Control system is used for conducting and the cut-off of control IGBT module, provides switch command to realize the quick switching of some negative electrodes by demand;
Some IGBT modules, the input of all IGBT links to each other, the access high voltage source, the output of each IGBT module links to each other with the input of a negative electrode respectively, is used for the plasma sheet of real time altering alternation.
High voltage source links to each other with the input of some IGBT modules, is used for driving plasma sheet work.
We have invented the device that a kind of new electromagnetic beam scans in 180 degree directions, the plasma sheet that namely produces with said method is as reflecting surface, the electromagnetic wave irradiation of certain frequency is to this plane, as shining on the metal covering, produce reflection, also meet the rule of " incidence angle equals angle of reflection " simultaneously.Under the control of diverter switch, be in the plasma sheet alternation of different directions, so that electromagnetic wave directive different directions realizes that wave beam scans in 180 degree directions.Simultaneously, the electromagnetic wave of other frequency had the transmission effect.
The invention has the advantages that, can optionally reflect the electromagnetic wave of different frequency; This plasma sheet can open or close moment, after closing, electromagnetic wave is cut little ice; Utilize TURP to bring the change electromagnetic beam and reflect in 180 degree spaces, can be directly as the directional scanning antennas use of 180 degree, sweep speed is fast.
Description of drawings
Fig. 1 is the generation device schematic diagram of the plasma sheet of prior art;
Fig. 2 is the structural representation of plasma directional scanning antenna of the present invention;
Fig. 3 is the cathode construction schematic diagram of 180 degree directional scanning antennas of plasma of the present invention;
Fig. 4 is the circuit diagram of diverter switch.
The accompanying drawing sign:
1, anode 2, negative electrode 3, vacuum chamber
4, magnetic field generating apparatus 5, plasma dignity 6, wave electromagnetic radiation source (transmitting antenna)
7～11, a plurality of negative electrodes 12～16, the direction of electromagnetic wave after 7～11 reflections that penetrated by emission source 6
Embodiment
The generation device schematic diagram of plasma sheet as shown in Figure 1, comprise a vacuum chamber 3, a negative electrode 2 and the anode 1 placed at vacuum chamber 3 two ends, the external excitation power supply of described negative electrode and positive electrode, and the outer magnetic field generating apparatus of vacuum chamber, the magnetic field that produces makes electron cyclotron produce double ionization, forms plasma sheet in vacuum chamber, and this plasma sheet is as the reflecting surface of incident electromagnetic wave.
The negative electrode and positive electrode of electron beam source is placed respectively two ends in the vacuum chamber, negative electrode 2 adopts the wire hollow cathode, anode 1 adopts writing board shape, under suitable air pressure (about 100Pa) and working gas (helium) condition, namely when in vacuum chamber, injecting (low discharge) helium, bleed, keeping the air pressure of vacuum chamber is 100Pa, add certain high voltage at electrode and produce the electron beam of wire, high voltage makes excited gas discharge between 1 on negative electrode 2 and the anode, namely produces low temperature plasma.Add in addition magnetic field generating apparatus 4 outside vacuum chamber, make the generation axial magnetic field, axial magnetic field makes electron cyclotron produce double ionization, forms plasma sheet 5, the i.e. plasma of flat shape.This device utilizes axial magnetic field, has changed the shape of plasma, becomes sheet.
In the present embodiment, cavity material adopts polymethyl methacrylate, and electrode adopts brass, the power acquisition high-voltage DC power supply of field coil, and the excitation power supply of plasma adopts the high-voltage pulse excitation power supply.A transmitting antenna and two reception antennas all adopt pyramidal horn antenna.
Job step is as follows:
1. open excitation power supply and magnetic field power supply, open radio transmitter;
2. excitation power supply voltage is risen to the voltage of requirement, produce plasma sheet, utilize this moment two reception antennas to observe reflected wave and transmitted wave by oscilloscope.
3. when the voltage of excitation power supply is constant (this moment, the density of plasma was constant) regulates tranmitting frequency, can be observed, and the electromagnetic wave of certain frequency can reflect, and the electromagnetic wave of other frequency can transmissive.
4. change the voltage (namely having changed the density of plasma) of excitation power supply, readjust tranmitting frequency, can be observed, change has all occured in the wave frequency of reflection and the wave frequency of transmission.
The theory structure of the solution of the present invention as shown in Figures 2 and 3.
The cavity material of Fig. 2 adopts polymethyl methacrylate, and electrode adopts brass, the power acquisition high-voltage DC power supply of field coil, and the excitation power supply of plasma adopts the high-voltage pulse excitation power supply.A transmitting antenna and a plurality of reception antenna all adopt parabolic antenna.
Embodiment and job step are as follows:
1. set up reception antenna in the direction that is complementary with plasma sheet work, open excitation power supply and magnetic field power supply, open radio transmitter;
2. excitation power supply voltage is risen to the voltage of requirement, produce plasma sheet, utilize this moment two reception antennas to observe reflected wave and transmitted wave by oscilloscope.
3. when the voltage of excitation power supply is constant (this moment, the density of plasma was constant) regulates tranmitting frequency, can be observed, and the electromagnetic wave of certain frequency can reflect, and the electromagnetic wave of other frequency can transmissive.
4. change the voltage (namely having changed the density of plasma) of excitation power supply, readjust tranmitting frequency, can be observed, change has all occured in the wave frequency of reflection and the wave frequency of transmission.
5. the voltage of excitation power supply is fixed, tranmitting frequency is fixed, and position of transmitting antenna is fixed, and changes the setting of high pressure diverter switch, makes different plasma sheet alternations, then can receive respectively electromagnetic wave on different reception antennas.Verified that thus incident electromagnetic wave can reflected radiation form the rapid scanning of wave beam to the space on plasma sheet.
Fig. 3 is the electromagnetic wave beam scanning of 180 degree, specifically comprises: 5 negative electrodes 7～11 that intersect at a point and form an angle, by the quick switching of 5 plasma sheets of diverter switch control, alternation forms 180 sweep limitss of spending.
Fig. 4 is diverter switch of the present invention, the realization of switching fast with reference to accompanying drawing as seen, each electrode links to each other with the output of a high pressure IGBT module, the input of IGBT is connected in high-voltage output end jointly.Whether the conducting of each IGBT module can by demand provide switch command to realize the quick switching of electrode by computer control.
It should be noted last that above embodiment is only unrestricted in order to technical scheme of the present invention to be described.Although with reference to embodiment the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, technical scheme of the present invention is made amendment or is equal to replacement, do not break away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of the claim scope of the present invention.
Claims (1)
1. plasma directional scanning antenna, this device comprises: a vacuum chamber is provided with corresponding negative electrode and positive electrode in the described vacuum chamber; Vacuum chamber is provided with magnetic field generating apparatus outward, in vacuum chamber, form plasma sheet, it is characterized in that, described negative electrode is somely to intersect at same end and be positioned at the same level face, described cathode sets is connected to some high voltage pulse excitation power supplies by one group of quick diverter switch, controls the quick switching of some plasma sheets by this diverter switch;
The maximum subtended angle of described cathode sets is 90 degree, and what all the other some negative electrodes can be even or inhomogeneous is distributed in this 90 degree angular range, realizes 180 degree radiation to incident electromagnetic wave;
Described diverter switch comprises:
Control system is used for conducting and the cut-off of control IGBT module, provides switch command to realize the quick switching of some negative electrodes by demand;
Some IGBT modules, the input of all IGBT links to each other, access high voltage pulse excitation power supply, the output of each IGBT module links to each other with the input of a negative electrode respectively, is used for the plasma sheet of real time altering alternation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910243956 CN101728651B (en) | 2009-12-25 | 2009-12-25 | Plasma directional scanning antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910243956 CN101728651B (en) | 2009-12-25 | 2009-12-25 | Plasma directional scanning antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101728651A CN101728651A (en) | 2010-06-09 |
| CN101728651B true CN101728651B (en) | 2013-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200910243956 Expired - Fee Related CN101728651B (en) | 2009-12-25 | 2009-12-25 | Plasma directional scanning antenna |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201620123D0 (en) * | 2016-11-28 | 2017-01-11 | Plasma Antennas Ltd | A frequency scanned |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201336769Y (en) * | 2008-12-19 | 2009-10-28 | 中国科学院空间科学与应用研究中心 | High-density large-area plasma sheet generating device |
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2009
- 2009-12-25 CN CN 200910243956 patent/CN101728651B/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201336769Y (en) * | 2008-12-19 | 2009-10-28 | 中国科学院空间科学与应用研究中心 | High-density large-area plasma sheet generating device |
Non-Patent Citations (2)
| Title |
|---|
| Meger R.A. et al.X-Band Microwave Beam Steering Using a Plasma Mirror.《Proceedings IEEE Aerospace Conference》.1997,49-56. |
| X-Band Microwave Beam Steering Using a Plasma Mirror;Meger R.A. et al;《Proceedings IEEE Aerospace Conference》;19971231;49-56 * |
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| CN101728651A (en) | 2010-06-09 |
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Granted publication date: 20130529 Termination date: 20191225 |