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

fYear

2014

fDate

6-11 July 2014

Firstpage

1815

Lastpage

1816

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 0.03λ_700MHz 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;

fLanguage

English

Publisher

ieee

Conference_Titel

Antennas and Propagation Society International Symposium (APSURSI), 2014 IEEE

Conference_Location

Memphis, TN

ISSN

1522-3965

Print_ISBN

978-1-4799-3538-3

Type

conf

DOI

10.1109/APS.2014.6905234

Filename

6905234