Title :
Axial ratio enhanced ultra wideband slot spiral on hybrid ebgs
Author :
Zheyu Wang ; Karathanasis, Konstantinos ; Volakis, J.L.
Author_Institution :
Dept. of Electr. & Comput. Eng., Ohio State Univ., Columbus, OH, USA
Abstract :
We present a low-profile ultra wideband slot spiral antenna on a hybrid EBG-based reflecting cavity. A unique aspect of the proposed hybrid EBG impedance surfaces is its wide bandwidth performance via constructive interference of the ground plane with the antenna. This characteristic leads to highly improved axial ratio performance as compared to spirals on a metallic ground plane cavity. The proposed hybrid EBGs achieved a 7:1 bandwidth from 0.7GHz to 5GHz with <;4dB axial ratio. Concurrently, the cavity depth of this antenna is only 13mm, and 0.03λ700MHz at its lowest operational frequency. As such, this slot spiral is attractive in enabling low-profile and conformal antenna installation for body-worn applications.
Keywords :
electromagnetic interference; microwave antennas; photonic band gap; reflector antennas; slot antennas; spiral antennas; ultra wideband antennas; wearable antennas; axial ratio performance; body-worn applications; conformal antenna installation; constructive interference; electromagnetic band gap structures; frequency 0.7 GHz to 5 GHz; hybrid EBG impedance surfaces; hybrid EBG-based reflecting cavity; metallic ground plane cavity; size 13 mm; ultra wideband slot spiral antenna; Bandwidth; Cavity resonators; Periodic structures; Slot antennas; Spirals; Surface impedance;
Conference_Titel :
Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE
Conference_Location :
Memphis, TN
Print_ISBN :
978-1-4799-3538-3
DOI :
10.1109/APS.2014.6905234
