TY - JOUR
T1 - Multioctave frequency selective surface reflector for ultrawideband antennas
AU - Ranga, Yogesh
AU - Matekovits, Ladislau
AU - Esselle, Karu P.
AU - Weily, Andrew R.
PY - 2011
Y1 - 2011
N2 - 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 λ/4, where λ 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 714 GHz, the antenna is more directie 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.
AB - 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 λ/4, where λ 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 714 GHz, the antenna is more directie 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.
UR - http://www.scopus.com/inward/record.url?scp=79953269564&partnerID=8YFLogxK
U2 - 10.1109/LAWP.2011.2130509
DO - 10.1109/LAWP.2011.2130509
M3 - Article
AN - SCOPUS:79953269564
SN - 1536-1225
VL - 10
SP - 219
EP - 222
JO - IEEE Antennas and Wireless Propagation Letters
JF - IEEE Antennas and Wireless Propagation Letters
ER -