| Summary: | 碩士 === 清雲科技大學 === 電子工程研究所 === 93 === The microwave absorbers exhibit numerous characteristics such as absorbing, attenuation, shielding, isolation, and grounding. A single layer microwave absorber represents narrower spectrum in comparison to a double.layers and multi.layers absorber in wide.band response in the frequency analysis. However, the volume and weight of the absorber’s structure were varited by increasing the number of layers. The applications of improving single layer absorber by the Frequency Selective Surfaces （FSS）are developing in nowadays. The FSS is a periodic array which consists of patch or aperture elements so as to design a desired filter by using different kind of array combinations. The performance of the FSS is highly related to the unit size, geometrical patterns and permutations. This paper had designed three basic geometrical patterns, such as rectangle, π.shape and comb.shape, and applied to the frequency range from three to eight GHz in order to obtain the desired frequency response. The experimental results show that the comb.shape performs the better combinatorial characteristics and its H.Field has the best frequency response among the proposed patterns. The obtained reflective and absorptive bandwidth percentage bellow .10dB are 40.6% and 58.9% for the patch part , and 37.2% and 63.0% for the aperture part respectively.
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