具金屬背板之自組式散射體

Self-Structuring Electromagnetic Scatterer Using a Conductor-Backed Template

方俐媛(Li-Yuan Fang)

指導教授 ： 陳士元

國立臺灣大學/電機資訊學院/電信工程學研究所/碩士(2013年)

https://doi.org/10.6342/NTU.2013.00581

摘要

本文提出一新型具金屬背板之自組式散射體。自組式散射體係藉由金屬線段長度之改變，其散射電場相位亦隨之改變，因此運用電腦演算法計算找出最合適之金屬線段組態，調控散射體之散射場型，達到在特定方向之雷達散射截面積之最大化或最小化。此具金屬背板之自組式散射體，因金屬背板之散射電場對金屬線段散射電場造成建設性或破壞性干涉，使金屬線段長度改變時，所能調控之散射電場相位範圍大幅增加。因相位增加，使自組式散射體可控制性提升，此結構除了於單一頻率點單一角度之單目標散射場最佳化，可應用之目標角度範圍增加，本文亦更進一步討論該結構於特定角度下，具頻寬之多目標最佳化、以及於特定頻率下，多角度之散射場多目標最佳化。以上均透過電磁模擬軟體及實作量測進行驗證及討論。

關鍵字

自組式散射體 ； 雷達散射截面積 ； 基因演算法

並列摘要

A self-structuring electromagnetic scatterer (SSES) based on a novel conductor-backed template is proposed. The SSES with an embedded genetic algorithm can alter its electrical shape to fulfill different scattering objectives, such as radar cross section (RCS) reduction or beam steering of the scattering pattern. Each constituent element in this conductor-backed SSES template has a larger tuning phase range so that it outperforms the previous version without the back conducting plane. The proposed SSES template with the multiple-objective fitness function being used in the search algorithm is capable of RCS reduction or beam steering at not only one single specified direction or frequency point but also within an angular range or a frequency band. The performance of the proposed SSES is verified by both full-wave simulations and experimental measurements.

並列關鍵字

self-structuring electromagnetic scatterer ； radar cross-section ； genetic algorithm

參考文獻

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