Multi-Band Frequency Selective Surfaces Using Square Loops with Splits

Reflective Frequency Selective Surfaces (FSS) with square loop shaped patches loaded with splits are proposed for multiband applications. A FSS with dual band response is proposed followed by another design with triple band response. The FSS unit cell designs differ in number of loops with splits. The triple band FSS exhibits stop bands near 2.4 GHz, 4.8 GHz, 8.8 GHz with adequate -10 dB bandwidths of 0.31 GHz, 0.55 GHz and 1.14 GHz respectively. Such response makes the FSS suitable for ISM band, C band X band applications. Various orientations of the split loaded loops are also studied and the studies are presented in the paper.