Design of a cavity backed spiral antenna with improved pattern symmetry

Mohamad, Sarah Yasmin and Cahill, Robert and Fusco, Vincent (2013) Design of a cavity backed spiral antenna with improved pattern symmetry. In: 2013 7th European Conference on Antennas and Propagation (EuCAP), 8th-12th April 2013 , Gothenburg.

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Abstract

In this paper we investigate the azimuthal pattern symmetry of an Archimedean spiral antenna which is designed to operate over the frequency range 3-10 GHz. The performance of the spiral in free space is compared with a structure that is backed by a perfect electric conductor with a separation distance of λ/4 at the operating frequencies. The latter arrangement exhibits a higher gain, however it is observed that the radiation patterns are less symmetrical about boresight and this performance degradation increases with frequency. The predicted 3 dB beamwidth difference is shown to vary between 14° (3 GHz) and 51° (10 GHz). An improved antenna design is described which reduces the pattern asymmetry to ≈ 2° at 10 GHz. The reduction in modal contamination is obtained by inserting slots carefully arranged in a radial pattern to disrupt the surface currents that flow on the ground plane of the antenna.

Item Type:	Conference or Workshop Item (Full Paper)
Additional Information:	7441/45484 (eISBN: 978-88-907018-1-8, ISBN: 978-88-907018-3-2)
Uncontrolled Keywords:	spiral antennas, cavity backed antennas, selfcomplementary antennas, UWB antennas, Archimedean spiral antenna
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK5101 Telecommunication. Including telegraphy, radio, radar, television
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Electrical and Computer Engineering
Depositing User:	Dr Sarah Yasmin Mohamad
Date Deposited:	23 Nov 2015 16:41
Last Modified:	23 Nov 2015 16:41
URI:	http://irep.iium.edu.my/id/eprint/45484

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