Design of a New Triple-Band Frequency Selective Surface for Filtering WiMAX, WLAN, and X Bands

This paper proposes a novel single-layer Frequency Selective Surface (FSS) designed on an FR۴ substrate with a thickness of ۱.۶ mm for triple-band filtering applications. The proposed FSS structure consists of unit cells with dimensions of ۱۰×۱۰ mm². The design incorporates a square ring at the top layer, accompanied by two symmetrical rectangular rings at the sides and a vertical rectangular branch placed in the center of the rectangular rings on the bottom layer. The conductive elements are made from a perfect conductor to achieve optimal performance. The structure operates across three distinct frequency bands: ۳.۲ to ۳.۸۱ GHz, ۴ to ۵.۸۲ GHz, and ۸.۲۱ to ۱۲.۲ GHz, which correspond to WiMAX, WLAN, and X bands, respectively. This triple-band functionality makes the proposed FSS suitable for applications in modern wireless communication systems. The frequency response of the FSS remains stable across various incidence angles for both Transverse Electric (TE) and Transverse Magnetic (TM) polarizations, confirming the robustness and reliability of the structure. Key advantages of the proposed FSS include its smaller physical dimensions compared to previous designs, the simplicity of its conductive elements, and its alignment with widely used frequency bands. These features collectively enhance the potential of the FSS for integration in compact and efficient filtering systems, offering significant improvements over traditional multi-band filters.

کلیدواژه ها:

Base Unit Cell ، Frequency selective surface ، Triple-Band Filtering