New technique for designing wideband one layer frequency selective surface in X-band with stable angular response

作者：Rahzaani Mahdiye^*; Dadashzadeh Gholamreza; Khorshidi Mohammadreza

来源：Microwave and Optical Technology Letters, 2018, 60(9): 2133-2139.

DOI：10.1002/mop.31304

• frequency selective surface
• 1 layer
• resonant frequency
• wideband unit cell

In this article, a new method is presented for designing frequency wideband unit cell to use in frequency selective surfaces (FSSs). A double slot square loop (DSSL), which has 2 resonant frequencies, is selected as a primary FSS unit cell and its frequency bandwidth is increased with the proposed method. The effect of the applied innovation on frequency response of DSSL unit cell is investigated by equivalent circuit presented in this paper. Simulated frequency response of the designed unit cell shows that frequency bandwidth of this unit cell increases in comparison with that of primary unit cell. A FSS structure with the designed unit cell is fabricated and its measured return loss confirms that, the frequency bandwidth of the proposed structure is about 50% in X-band. In addition, frequency response of this FSS structure is stable during 45 degree angle deviation of the incident wave from normal axis of the FSS surface. High frequency bandwidth, low fabrication complexity and stable angular response are the favorable characteristics of the proposed FSS structure which make it suitable for using in microwave filters.

• 出版日期2018-9