Multioctave frequency selective surface reflector for ultrawideband antennas

Yogesh Ranga*, Ladislau Matekovits, Karu P. Esselle, Andrew R. Weily

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

139 Citations (Scopus)
6 Downloads (Pure)


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.

Original languageEnglish
Pages (from-to)219-222
Number of pages4
JournalIEEE Antennas and Wireless Propagation Letters
Publication statusPublished - 2011


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