Research on an axially slotted cylinder antenna coated with plasma sheath

Li, Wei; Qiu, Jinghui; Deng, Weibo; Suo, Ying

doi:10.1109/icmmt.2008.4540849

Cited by 3 publications

References 6 publications

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Navigation antenna performance degradation caused by plasma sheath

Shi

Bai

Liu

et al. 2013

Journal of Electromagnetic Waves and Applications

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A plasma sheath generated around a hypersonic vehicle can be a serious obstacle to fixedfrequency communications, especially navigation systems. This paper studies the effects of a plasma sheath on a Beidou navigation circular microstrip patch antenna. The dynamic stratified medium model method, which is based on the gradient of electron density profile curve, is employed to model the nonuniform plasma sheath. Using the algorithm calculation of the time-domain finite integration, the navigation antenna radiation pattern property is obtained, along with the changes in the reflection coefficient and input impedance properties. Results show that antenna pattern distortion, resonant frequency shift, and impedance mismatch caused by plasma are proportional to the electron density. The process of reentry blackout is also reproduced from the perspective of the antenna performance degradation. The inductor L and capacitor C (LC tuning circuit) impedance mismatch compensation scheme proposed is demonstrated to be effective and it can decrease return loss by 19.4 dB under the most serious plasma environment, thus reducing signal reflection and enhancing navigation system performance.

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