Abstract
The design and implementation of a dual-layer Frequency Selective Surface for radiation diversity of a dual-band antenna has been presented in this paper. In the proposed design, two FSS screens with metallic patches offering reflection at 5.5 GHz and metallic grids offering transmission at 3 GHz are placed at 90° at a specific distance from the antenna. The FSS improves antenna impedance bandwidth (−10 dB) from 20% to 42% and gain leading to a directive radiation over 4.5-6.5 GHz whereas maintaining omni-directional radiation around 3 GHz. A significant increase of 8-10 dB in antenna gain is achieved over 4.5-6.5 GHz with an average 12 dB with a variation of ±2 dB. The proposed antenna system can be used as an omni-directional radiator at 3 GHz (2.6–3.3 GHz) as well as a directional radiator in the 4.5-6.5 GHz band leading to radiation diversity.
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