選取Y 環和Y 組成的復合圖形為基本圖形單元，采用密集三角形排布方式，設計了
一種密集型組合單元頻率選擇表面（FSS）結構。基于譜域法，通過重新選取新的分析單元的方法，從理論上進行了頻譜分析。分析結果表明，該FSS 結構能夠實現雙頻的寬通帶特性，并且具有很好的極化穩定性和角度穩定性。
關鍵詞：濾波器；頻率選擇表面；譜域法；極化穩定性；角度穩定性

Abstract: Frequency Selective Surface (FSS) of complex dense elements is presented in this
paper. The complex elements composed of Y loop and Y geometries are closely packed in
triangle form. Based on the spectral-domain method, this FSS structure was analyzed by
selecting a new analytical unit. It is shown that this complex dense FSS structure has
dual-frequency and wide pass-band properties with better performance of polarization and
incident angles independence.
Key words: Filter; frequency selective surface (FSS); the spectral-domain method; polarization
independence; independence of incident angles