Open AccessPerformance of Archimedean spiral antenna backed by FSS reflector
Author(s) -
Mohamad S.,
Cahill R.,
Fusco V.
Publication year - 2015
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2014.3693
Subject(s) - reflector (photography) , spiral antenna , spiral (railway) , optics , antenna (radio) , periscope antenna , directional antenna , physics , antenna measurement , microstrip antenna , engineering , electrical engineering , coaxial antenna , mechanical engineering , light source
The use of a backing cavity composed of a frequency selective surface (FSS) above a metal plate as a means to suppress the back lobe radiation and increase the gain of an Archimedean spiral antenna that operates from 3 to 10 GHz is investigated. The FSS is designed to reflect signals in the upper band (7–10 GHz) with a loss of <0.25 dB, and allow transmission in the lower band (3–6 GHz). Good impedance match and bidirectional to unidirectional beam transformation is obtained when the FSS and metal plate are inserted at a distance λ /4 below the spiral at the centre of the upper and lower bands, respectively. Simulated and measured radiation patterns are employed to show the performance enhancement, which is attributed to the FSS reflector.