CST – Computer Simulation Technology

Multioctave Frequency Selective Surface Reflector for Ultrawideband Antennas
Yogesh Ranga, Ladislau Matekovits, Karu P. Esselle, Andrew R. Weily
IEEE Antennas and Wireless Propagation Letters
Volume: 10, 2011
219 - 222
Frequency selective surface (FSS), periodic structures, ultrawideband (UWB)
In this letter, we demonstrate the gain enhancement of an ultrawideband (UWB) antenna, achieved using an appropriately designed multioctave dual-layer frequency selective surface (FSS) reflector. The proposed novel FSS reflects effectively in phase over a bandwidth of about 120%. Hence, significant enhancement in antenna gain has been achieved with a low-profile configuration without compromising the impedance bandwidth of the UWB antenna. The proposed FSS reflector has a low transmission coefficient and linearly decreasing phase over an ultra-wide frequency band, which is the key requirement for providing an effectively in-phase reflection at the antenna plane. The composite structure is compact, with a total height of ??, where is the free-space wavelength at the lowest operating frequency of 3 GHz. Experimental results show an impedance bandwidth of 122%. The antenna gain is maintained around 7.5 dBi from 3 to 7 GHz. Between 7–14 GHz, the antenna is more directive with a gain of about 9 dBi with 0.5 dB variation. Experimental measurements confirm the predicted wideband antenna performance and gain enhancement due to the FSS reflector

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