Spiral antenna with reconfigurable HIS using liquid crystals for monopulse radar application

Mohamad, Sarah Yasmin and Cahill, Robert (2017) Spiral antenna with reconfigurable HIS using liquid crystals for monopulse radar application. In: The 2017 IEEE International Conference on Antennas and Applications (IEEE CAMA 2017), 4th-6th December 2017, Ibaraki, Japan.

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Abstract

In this paper, the design of an electronically reconfigurable ground plane composed of a high impedance surface (HIS) based on liquid crystals is presented and used as a backing structure for a two-arm Archimedean spiral antenna. The structure is used to provide electronic switching of two different shaped radiation patterns for monopulse radar application; 1) sum-pattern (Σ-pattern), and 2) difference pattern (Δ-pattern). The antenna arrangement is shown to exhibit either the Σ- or the Δ-beam by changing the permittivity (and hence reflection phase) of the HIS reflector when a bias voltage is applied between the periodic array and ground plane. The HIS is demonstrated to resonate at 6 GHz, and numerical results are employed to investigate the performance of the HIS-backed spiral arrangement, i.e. radiation pattern, impedance match, realized gain (Σ-pattern), and null depth (Δ-pattern).

Item Type:	Conference or Workshop Item (Plenary Papers)
Additional Information:	7441/61407
Uncontrolled Keywords:	spiral antenna; high impedance surface (HIS); liquid crystals; monopulse radar; direction-finding application.
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:	18 Jan 2018 08:58
Last Modified:	28 Jun 2018 16:35
URI:	http://irep.iium.edu.my/id/eprint/61407

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