CST – Computer Simulation Technology

Multioctave Frequency Selective Surface Reflector for Ultrawideband Antennas

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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