电磁波在等离子体中的传播衰减
|
摘要
针对通信黑障的问题,文中从电磁波在等离子体中的传播特性出发,利用Matlab数值仿真,研究不同电磁波频段,不同等离子体参数,包括等离子频率、碰撞频率、等离子温度、压强等对电磁波传播衰减的影响,以及外加磁场作用下,不同极化的电磁波在等离子体层的传播衰减特性。研究结果表明:外加磁场可明显降低圆极化电磁波衰减,并且当外加磁场满足一定条件,大于最小磁场强度时,电磁波衰减小于10 dB;且同等条件下右旋极化比左旋极化电磁波的衰减更小,为了获得较小的电磁波衰减,右旋极化电磁波所需的磁场强度也小于左旋极化。
Aiming at the problem of communication blackout,in this paper,based on the characteristics of electromagnetic wave propagation in plasma, different electromagnetic wave frequency bands, different plasma parameters including plasma frequency, collision frequency, plasma temperature are studied by Matlab simulation. The influence of pressure on the propagation and attenuation of electromagnetic wave and the attenuation characteristics of electromagnetic wave with different polarization in plasma layer under the action of external magnetic field. The results show that the applied magnetic field can obviously reduce the attenuation of circularly polarized electromagnetic wave, and when the applied magnetic field satisfies certain conditions and is larger than the minimum magnetic field intensity, the attenuation of the wave is less than 10 dB. And under the same conditions, the attenuation of right-handed polarized wave is less than that of left-handed polarized wave.In order to obtain smaller wave attenuation, the magnetic field intensity required by the right-handed polarized wave is less than that of the left-handed polarized wave.
Aiming at the problem of communication blackout,in this paper,based on the characteristics of electromagnetic wave propagation in plasma, different electromagnetic wave frequency bands, different plasma parameters including plasma frequency, collision frequency, plasma temperature are studied by Matlab simulation. The influence of pressure on the propagation and attenuation of electromagnetic wave and the attenuation characteristics of electromagnetic wave with different polarization in plasma layer under the action of external magnetic field. The results show that the applied magnetic field can obviously reduce the attenuation of circularly polarized electromagnetic wave, and when the applied magnetic field satisfies certain conditions and is larger than the minimum magnetic field intensity, the attenuation of the wave is less than 10 dB. And under the same conditions, the attenuation of right-handed polarized wave is less than that of left-handed polarized wave.In order to obtain smaller wave attenuation, the magnetic field intensity required by the right-handed polarized wave is less than that of the left-handed polarized wave.
引文
[1] DAI Y, LIU S B, KONG X K, et al. Modulation of high-or-der harmonic waves using nonlinear plasmaphotonic crystal and defective photonic crystal[J]. Optics & Laser Technology, 2013, 48(11): 178-181.
[2] RYBAK J P, CHURCHILL R J. Progress in reentry Communications[J]. IEEE Transactions on Aerospace and Electronic Systems, 1971,7(5): 879-894.
[3] ZHOU H, LI X P, LI Y M, et al. Effects of nonuniform magnetic fields on the magnetic window in blackout mitigation[J]. IEEE Transactions on Plasma Science, 2017, 4(1): 15-23.
[4] GUO L J, GUO L X, LI J T, et al. Propagation of electromagnetic waves on a relativistically moving nonuniform plasma[J]. IEEE Antennas and Wireless Propagation Letters, 2016,16 (5): 137-140.
[5] YAO B, LI X P, SHI L, et al. A multiscale model of reentry plasma sheath and Its nonstationary effects on electromagnetic wave propagation[J]. IEEE Transactions on Plasma Science, 2017, 45(8): 2227-2234.
[6] MINKWAN K, MICHAEL K, LAIN D B, et al. Electrostatic manipulation of a hypersonic plasma layer: images of the two-dimensional sheath[J]. IEEE Transactions on Plasma Science, 2008, 36(4): 1198-1199.
[7] YANG X, WEI B, WANG Q, et al. A special transmission characteristic of the electromagnetic wave in the plasma sheath surrounding a near-space vehicle and its analysis[C]// Antennas, Propagation and EM Theory, Proceedings of 11th International Symposium. Guilin: IEEE Press, 2016: 18-21.
[8] RAJKUMAR D, NILADRI R, RAJARSHI B, et al. Reduction of attenuation of e.m wave inside plasma formed during supersonic or hypersonic re-entry of missile like flight vehicles by the application of D.C.magnetic field: a technique for mitigation of RF blackout[C]// IEEE Applied Electromagnetics Cofnerence. Kolkata: IEEE Press, 2011: 1-4.
[9] YUAN C X, ZHOU Z X, ZHANG J W, et al. Properties of propagation of electromagnetic wave in a multilayer radar-absorbing structure with plasma and radar-absorbing material[J]. IEEE Transactions on Plasma Science, 2011 ,39 (9): 1768-1775.
[10] SCHWEIGERT I V. Simulation of the influence high-frequency (2 MHz) capacitive gas discharge and agnetic field on the plasma sheath near a surface in hypersonic gas flow[J]. Journal of Experimental and Theoretical Physics, 2012, 115(2): 350-355.
[11] 赵宏康, 陆建萍. 平面电磁波在等离子体中的吸收衰减[J]. 北京理工大学学报, 2004, 24(4): 350-352.ZHAO Hongkang, LU Jianping. Absorption and attenuation of plane electromagnetic waves in plasma[J]. Journal of Beijing Institute of Technology, 2004, 24(4): 350-352.
[12] WANG R K, ZUO H F, MENG L V, et al. Analytical calculation and simulation for magnetic field distribution of ring magnet[J]. Aeronautical Computing Technique, 2011, 41(5): 19-23.
[13] LI J, PI Y M A. Conception on the terahertz communication system for plasma sheath penetration[C]// 6th International ICST Conference on Communications and Networking in China. Harbin: IEEE Press, 2011: 50-52.
[2] RYBAK J P, CHURCHILL R J. Progress in reentry Communications[J]. IEEE Transactions on Aerospace and Electronic Systems, 1971,7(5): 879-894.
[3] ZHOU H, LI X P, LI Y M, et al. Effects of nonuniform magnetic fields on the magnetic window in blackout mitigation[J]. IEEE Transactions on Plasma Science, 2017, 4(1): 15-23.
[4] GUO L J, GUO L X, LI J T, et al. Propagation of electromagnetic waves on a relativistically moving nonuniform plasma[J]. IEEE Antennas and Wireless Propagation Letters, 2016,16 (5): 137-140.
[5] YAO B, LI X P, SHI L, et al. A multiscale model of reentry plasma sheath and Its nonstationary effects on electromagnetic wave propagation[J]. IEEE Transactions on Plasma Science, 2017, 45(8): 2227-2234.
[6] MINKWAN K, MICHAEL K, LAIN D B, et al. Electrostatic manipulation of a hypersonic plasma layer: images of the two-dimensional sheath[J]. IEEE Transactions on Plasma Science, 2008, 36(4): 1198-1199.
[7] YANG X, WEI B, WANG Q, et al. A special transmission characteristic of the electromagnetic wave in the plasma sheath surrounding a near-space vehicle and its analysis[C]// Antennas, Propagation and EM Theory, Proceedings of 11th International Symposium. Guilin: IEEE Press, 2016: 18-21.
[8] RAJKUMAR D, NILADRI R, RAJARSHI B, et al. Reduction of attenuation of e.m wave inside plasma formed during supersonic or hypersonic re-entry of missile like flight vehicles by the application of D.C.magnetic field: a technique for mitigation of RF blackout[C]// IEEE Applied Electromagnetics Cofnerence. Kolkata: IEEE Press, 2011: 1-4.
[9] YUAN C X, ZHOU Z X, ZHANG J W, et al. Properties of propagation of electromagnetic wave in a multilayer radar-absorbing structure with plasma and radar-absorbing material[J]. IEEE Transactions on Plasma Science, 2011 ,39 (9): 1768-1775.
[10] SCHWEIGERT I V. Simulation of the influence high-frequency (2 MHz) capacitive gas discharge and agnetic field on the plasma sheath near a surface in hypersonic gas flow[J]. Journal of Experimental and Theoretical Physics, 2012, 115(2): 350-355.
[11] 赵宏康, 陆建萍. 平面电磁波在等离子体中的吸收衰减[J]. 北京理工大学学报, 2004, 24(4): 350-352.ZHAO Hongkang, LU Jianping. Absorption and attenuation of plane electromagnetic waves in plasma[J]. Journal of Beijing Institute of Technology, 2004, 24(4): 350-352.
[12] WANG R K, ZUO H F, MENG L V, et al. Analytical calculation and simulation for magnetic field distribution of ring magnet[J]. Aeronautical Computing Technique, 2011, 41(5): 19-23.
[13] LI J, PI Y M A. Conception on the terahertz communication system for plasma sheath penetration[C]// 6th International ICST Conference on Communications and Networking in China. Harbin: IEEE Press, 2011: 50-52.