CN103326119B - Based on the Mini Microstrip magnet antenna of manual electromagnetic structure material - Google Patents
Based on the Mini Microstrip magnet antenna of manual electromagnetic structure material Download PDFInfo
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- CN103326119B CN103326119B CN201310265744.1A CN201310265744A CN103326119B CN 103326119 B CN103326119 B CN 103326119B CN 201310265744 A CN201310265744 A CN 201310265744A CN 103326119 B CN103326119 B CN 103326119B
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Abstract
The invention provides the Mini Microstrip magnet antenna based on manual electromagnetic structure material, the high-speed aircraft that there is plasma sheath cover for surface navigates and communicates.This antenna comprises the ground plate bottom of rare-earth permanent magnet SmCo, the intermediate layer of metal patch array, the upper strata of radiation patch.This magnet antenna can strengthen electromagnetic wave penetrability in the plasma, and realizes miniaturized.This aerial radiation goes out electromagnetic wave and decays in the plasma and reduce largely, can solve between aircraft and ground due to communication disruption problem that aircraft surface plasma sheath causes.
Description
Technical field
The invention belongs to microstrip antenna field, be specifically related to the Mini Microstrip magnet antenna based on manual electromagnetic structure material.
Background technology
When aircraft with hypersonic fly in atmosphere time, aircraft high ambient temperatures gas will part ionize, formed plasma.Electromagnetic wave is by plasma sheath cover communication process, and because being reflected by plasma sheath, reflect and absorbing, energy will significantly be decayed, and even transmit and interrupt completely.Slow down the electromagnetic wave major measure that decays in the plasma at present to have: change aerodynamic configuration, improve communication frequency, spray electrophilicity material, additional high-intensity magnetic field etc.Each measure has certain limitation, as changed the aerodynamic characteristic of aerodynamic configuration meeting change of flight device and bringing anti-heat problem; Raising communication frequency can relate to rain and decline and propagation in atmosphere attenuation problem; Injection electrophilicity material and additional high-intensity magnetic field can increase weight and the complexity of whole system.
H.Hodara analyzes the propagation characteristic of electromagnetic wave in magnetized plasma in several sections of articles delivered the sixties in last century, and proposes externally-applied magnetic field method to slow down right-handed circular polarization ripple propagation attenuation in the plasma.Its principle is when having Constant charge soil B0 to exist, free electron moves in a circle (qe and me is respectively the electron charge and electron mass that mks system of units provides), in being the introduction of new communication mode with cyclotron frequency ω b=qe*B0/me in the plane perpendicular with the magnetic line of force.Such as, for collisionless plasma (collision frequency is 0), as externally-applied magnetic field B0=0, the electromagnetic wave that operating frequency is less than plasma frequency can not be propagated.Along with the increase of B0, electron cyclotron orbit radius reduces.And as B0 for orbit radius time infinitely great levels off to 0, also namely the motion of electronics is frozen in transverse plane, therefore the plane electromagnetic wave that electronics is no longer perpendicular with B0 is had an effect, but opens one " spectral window ", and plane wave is propagated just as propagating in a vacuum through this window.
Additional high-intensity magnetic field slows down electromagnetic wave in the plasma in Research on attenuation, produces high-intensity magnetic field and mainly contains permanent magnet, solenoid and superconducting magnet three kinds of modes.Use solenoid to produce magnetic field, the volume and weight of coil all can be very large.Use superconductor technology then to need to add cooling system extraly and need to encourage superconducting coil in advance.For addressing this problem, the present invention antenna and strong permanent magnetic iron are designed to one, both magnet was produced high-intensity magnetic field as field generator for magnetic, again using magnet as antenna ground plate, this kind of antenna the present invention is referred to as " magnet antenna ".High-intensity magnetic field so both can be utilized to strengthen the wave transparent characteristic of electromagnetic wave in plasma sheath, weight and the complexity of system can have been increased again indistinctively.Conventional magnet antenna build is comparatively large, can not meet the trend of Antenna Design miniaturization.
Summary of the invention
In order to solve the problem, the present invention is based on manual electromagnetic structure material, research and design is a kind of for the small microstrip magnet antenna of high-speed aircraft navigation with the electromagnetic wave penetrability in the plasma that communicates, can strengthen.Concrete technical scheme of the present invention is as follows:
Based on a Mini Microstrip magnet antenna for manual electromagnetic structure material, it is characterized in that, comprising: bottom is the ground plate of rare-earth permanent magnet SmCo, intermediate layer is metal patch array, and upper strata is radiation patch, arranges mushroom array in described upper strata.
Further, the N52 rare-earth permanent magnet SmCo that described rare-earth permanent magnet SmCo is mximum residual magnetism intensity is 1.04-1.10T, maximum magnetic energy product is 207-231 kJ (kilojoule)/cubic meter.
Further, described metal patch array is 5 × 5 square-shaped metal patch array.
Further, described metal patch array there are 5 airports; The cellular construction length of side of metal patch array is 8-9mm, and the gap of cellular construction is 1-2mm.
Further, the size of described radiation patch is 34 × 33mm.
Further, described mushroom array is arranged on from center of antenna distance 4-5mm place; Described mushroom array is connected with bottom permanent magnet by metallization via hole.
Further, described mushroom array is 2 × 2 quadrate arrays; The unit length of side of 2 × 2 described quadrate arrays is 4-5mm.
Further, described antenna adopts the coaxial feed of 50 ohm.
Further, described coaxial feed be arranged on from center of antenna distance be 4.5mm place.
Further, the operating frequency of described antenna is 1.5-1.55GHz.
Beneficial effect of the present invention is as follows:
1. the present invention is radiation patch at the middle and upper levels, arranges mushroom array in the upper layer, thus realizes Miniaturization Design.The square-shaped metal patch array in the intermediate layer of antenna is provided with 5 airports, and this airport is to prevent metallization via hole to be connected with this layer of metal.
2. antenna provided by the invention and " magnetic window antenna strengthens plasma sheath wave transparent characteristic research " (aerospace journal volume the 7th phase July the 32nd in 2011, author Yu Zhefeng, Liu Jiaqi, Ren Aimin etc.) antenna in a literary composition compares, when antenna gain, bandwidth of operation are suitable, antenna provided by the invention achieves miniaturization, is about 0.193 λ, wants little about 0.1 λ than the antenna in " magnetic window antenna strengthens plasma sheath wave transparent characteristic research ".
3. under air ambient, antenna performance is emulated, obtain antenna return loss S11 and be less than-10dB(when 1.5GHz and be about-20dB).Port reflects is very little, and this illustrates that Antenna Impedance Matching is good.Be that 5.2dB, 3dB beamwidth is about 98 degree in frequency 1.5GHz place antenna gain, main radiation direction is at aerial head, and be all less than 3dB in antenna main radiation direction internal antenna axial ratio, in principal direction, the axial ratio of antenna is 2.1.
4. in plasma environment, antenna performance of the present invention is emulated.At this, simulation calculation then needs to carry out according to high-speed aircraft actual environment.The electron density of general high-speed aircraft surface plasma sheath cover is between 10^10/ cubic centimetre-10^13/ cubic centimetre, and when collision frequency is near wave frequency, electromagnetic wave is decayed in the plasma and reached maximum.Choose plasma electron density 10^11/ cubic centimetre, plasma collision frequency is 1.5GHz, and the homogeneous plasma being positioned at the cuboid above antenna emulates.The length of cuboid profile plasma and wide be 200mm, be highly 50mm.
It slows down the effect of electromagnetic wave propagation attenuation in the plasma to regulate permanent magnet bias magnetic field size to verify during emulation, and magnetic field size is set to 0,0.1T, 0.2T tri-kinds of situations.When magnetic field of permanent magnet is increased to 0.2T, antenna gain is increased to 4.4dB, close to antenna gain 5.2dB in atmosphere, decreases 26dB decay when electromagnetic wave is propagated in the plasma.Through the performance comparison in different size magnetic field, finally determine magnetic field size B
during 0.3T, antenna effectively can penetrate plasma.
Accompanying drawing explanation
Fig. 1: entire physical schematic diagram,
Fig. 2: antenna top-level schematic;
Fig. 3: antenna intermediate layer schematic diagram;
Fig. 4: do not have magnetic field antenna directional diagram after adding plasma;
Fig. 5: after adding plasma, magnetic field intensity is 0.1T radiation pattern;
Fig. 6: after adding plasma, magnetic field intensity is 0.2T radiation pattern;
Fig. 7: after adding plasma, magnetic field intensity is 0.2T antenna return loss;
Fig. 8: after adding plasma, when magnetic field intensity is 0.2T, the axial ratio directional diagram of antenna during 1.5GHz;
Wherein, 1 represents radiation patch, and 2 represent Rogers(Rogers) the microwave-medium plate of RO4500 type, 3 ground plates representing rare-earth permanent magnet SmCos.
Embodiment
Based on a Mini Microstrip magnet antenna for manual electromagnetic structure material, this antenna is made up of sandwich construction: bottom is ground plate, and this ground plate adopts the rare-earth permanent magnet SmCo of the YXG28 trade mark that remanent magnetism is larger, and its conductivity is 625000 Siemens/rice; Intermediate layer is 5 × 5 square-shaped metal patch array, and the cellular construction length of side is 8-9mm, and intermediate space is 1-2mm, paster has 5 airports, prevents metallization via hole to be connected (as shown in Figure 3) with this layer of metal; Upper strata is radiation patch, patch size be 34 × 33mm(as shown in Figure 2).This antenna adopts the coaxial feed of 50 ohm, and feed is 4.5mm from center of antenna O distance S.Be 2 × 2 mushroom arrays from center of antenna distance 4-5mm, be connected with bottom permanent magnet by metallization via hole, the cellular construction length of side of this mushroom array be 4-5mm(as shown in Figure 2).This operating frequency of antenna is about 1.5-1.55GHz.
Under air ambient, antenna performance of the present invention is emulated, obtain antenna return loss S11 and be less than-10dB(when 1.5GHz and be about-20dB).Port reflects is very little, and this illustrates that Antenna Impedance Matching is good.Be that 5.2dB, 3dB beamwidth is about 98 degree in frequency 1.5GHz place antenna gain, main radiation direction is at aerial head, and be all less than 3dB in antenna main radiation direction internal antenna axial ratio, in principal direction, the axial ratio of antenna is 2.1.
In plasma environment, antenna performance of the present invention is emulated.At this, simulation calculation then needs to carry out according to high-speed aircraft actual environment.The electron density of general high-speed aircraft surface plasma sheath cover is between 10^10/ cubic centimetre-10^13/ cubic centimetre, and when collision frequency is near wave frequency, electromagnetic wave is decayed in the plasma and reached maximum.Choose plasma electron density 10^11/ cubic centimetre, plasma collision frequency is 1.5GHz, and the homogeneous plasma being positioned at the cuboid above antenna emulates.The length of cuboid profile plasma and wide be 200mm, be highly 5mm.It slows down the effect of electromagnetic wave propagation attenuation in the plasma to regulate permanent magnet bias magnetic field size to verify during emulation, and magnetic field size is set to 0,0.1T, 0.2T tri-kinds of situations.Under concrete varying strength magnetic fields, the gain of antenna in plasma environment sees the following form:
As seen from the above table: when magnetic field of permanent magnet is increased to 0.2T, antenna gain is increased to 4.4dB, close to antenna gain 5.2dB in atmosphere, decrease 26dB decay when electromagnetic wave is propagated in the plasma.Through the performance comparison in different size magnetic field, finally determine magnetic field size B
during 0.3T, antenna effectively can penetrate plasma.
Claims (6)
1. based on a Mini Microstrip magnet antenna for manual electromagnetic structure material, it is characterized in that, bottom is the ground plate adopting rare-earth permanent magnet SmCo, and intermediate layer is metal patch array, and upper strata is radiation patch, and described radiation patch is mushroom array;
The N52 rare-earth permanent magnet SmCo that described rare-earth permanent magnet SmCo is residual magnetization is 1.04-1.10T, magnetic energy product is 207-231 kJ (kilojoule)/cubic meter;
Described metal patch array is 5 × 5 square-shaped metal patch array;
Described mushroom array is arranged on from center of antenna distance 4-5mm place; Described mushroom array is connected with bottom permanent magnet by metallization via hole;
Described mushroom array is 2 × 2 quadrate arrays; The cellular construction length of side of 2 × 2 described quadrate arrays is 4-5mm.
2. the Mini Microstrip magnet antenna based on manual electromagnetic structure material according to claim 1, is characterized in that: described metal patch array has 5 airports; The cellular construction length of side of metal patch array is 8-9mm, and the gap of cellular construction is 1-2mm.
3. the Mini Microstrip magnet antenna based on manual electromagnetic structure material according to claim 1, is characterized in that: the size of described radiation patch is 34 mm × 33mm.
4. the Mini Microstrip magnet antenna based on manual electromagnetic structure material according to claim 1, is characterized in that: described antenna adopts the coaxial feed of 50 ohm.
5. the Mini Microstrip magnet antenna based on manual electromagnetic structure material according to claim 4, is characterized in that: described coaxial feed be arranged on from center of antenna distance be 4.5mm place.
6. the Mini Microstrip magnet antenna based on manual electromagnetic structure material according to claim 1, is characterized in that: the operating frequency of described antenna is 1.5-1.55GHz.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103531897A (en) * | 2013-10-14 | 2014-01-22 | 南京理工大学 | Magnetic window antenna for avoiding communication blackout of near space plasma shell jacket |
| CN103796407A (en) * | 2014-01-23 | 2014-05-14 | 电子科技大学 | Device for relieving influence on high-speed aircraft reentry communication by space plasma |
| CN106961022A (en) * | 2017-03-30 | 2017-07-18 | 电子科技大学 | Miniaturization slant beam micro-strip yagi aerial based on manual electromagnetic structure |
| CN108182336B (en) * | 2018-02-05 | 2020-06-19 | 西安电子科技大学 | Method for calculating directional diagram of phased array antenna under plasma sheath |
| CN114597660B (en) * | 2022-03-08 | 2023-05-12 | 西安电子科技大学 | Antenna of multilayer mixed plasma nano patch |
Citations (2)
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|---|---|---|---|---|
| CN102290180A (en) * | 2011-04-26 | 2011-12-21 | 宁波科星材料科技有限公司 | Rear-earth permanent magnet material and preparation method thereof |
| CN102709670A (en) * | 2012-06-24 | 2012-10-03 | 电子科技大学 | Magnetic antenna for improving penetrability of electromagnetic wave in plasma |
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| JP2007235460A (en) * | 2006-02-28 | 2007-09-13 | Mitsumi Electric Co Ltd | Antenna system |
| US8514147B2 (en) * | 2006-11-22 | 2013-08-20 | Nec Tokin Corporation | EBG structure, antenna device, RFID tag, noise filter, noise absorptive sheet and wiring board with noise absorption function |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102290180A (en) * | 2011-04-26 | 2011-12-21 | 宁波科星材料科技有限公司 | Rear-earth permanent magnet material and preparation method thereof |
| CN102709670A (en) * | 2012-06-24 | 2012-10-03 | 电子科技大学 | Magnetic antenna for improving penetrability of electromagnetic wave in plasma |
Non-Patent Citations (2)
| Title |
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| 磁窗天线增强等离子体鞘套透波特性研究;于哲峰，刘佳琪，任爱民;《宇航学报》;20110731;第32卷(第7期);第1564-1568页 * |
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Inventor after: Zhao Qing Inventor after: Liu Ying Inventor after: Li Huayang Inventor after: Jiu Zhilong Inventor before: Zhao Qing |
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