Investigation of the transient EM scattering of a dielectric resonator

A. A. Abbas, A. Abuelhaija, K. Solbach
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引用次数: 14

Abstract

Dielectric resonators have gained interest in RF identification and localization system concepts. This contribution reports observations from experiments and EM simulation with special focus on the transient behavior of the EM scattering of a ceramic resonator in free space. Explanation and analysis of the transient behavior is given using equivalent circuit modeling and EM simulation. The time constant of the particular resonant mode excited is shown to depend on the loaded quality factor of the resonant mode and governs the exponential charging up process and the exponential decay process of "ringing" of the resonator at its Eigen frequency. For an exciting RF pulse much shorter than the time constant, the resonator scattering amplitude increases linearly with increasing pulse length which allows to determine the structural response also. Forced excitation at a frequency offset from the resonant frequency will still produce free "ringing" at the resonator's Eigen frequency. The scattering amplitude is related to the Radar Cross Section of a dielectric resonator, but this only applies to the steady state of excitation.
介质谐振器瞬态电磁散射的研究
介质谐振器在射频识别和定位系统概念中引起了人们的兴趣。这篇文章报道了实验和电磁模拟的观察结果,特别关注了陶瓷谐振器在自由空间中的电磁散射的瞬态行为。利用等效电路建模和电磁仿真对其瞬态特性进行了解释和分析。被激发的特定谐振模式的时间常数取决于谐振模式的负载质量因子,并决定了谐振器在其本征频率处的指数充电过程和指数衰减过程。对于比时间常数短得多的激励射频脉冲,谐振腔散射振幅随脉冲长度的增加而线性增加,这也允许确定结构响应。在谐振频率的频率偏移处的强制激励仍将在谐振器的本征频率处产生自由的“振铃”。散射振幅与介电谐振器的雷达截面有关,但这仅适用于稳态激励。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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