Spiral Antenna with Reconfigurable HIS using Liquid Crystals for Monopulse Radar Application

Sarah Mohamad, Robert Cahill

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)
228 Downloads (Pure)

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) differencepattern (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 HISbacked spiral arrangement, i.e. radiation pattern, impedance match, realized gain (Σ-pattern), and null depth (Δ-pattern).  
Original languageEnglish
Title of host publication IEEE Conference on Antenna Measurements & Applications (CAMA), 4-6th Dec 2017
Pages55-58
Number of pages4
ISBN (Electronic)978-1-5090-5028-4
DOIs
Publication statusPublished - 01 Feb 2018
Event2017 IEEE Conference on Antenna Measurements & Applications (CAMA) - Ibaraki, Japan
Duration: 04 Dec 201706 Dec 2017
http://www.2017ieeecama.org/

Conference

Conference2017 IEEE Conference on Antenna Measurements & Applications (CAMA)
CountryJapan
CityIbaraki
Period04/12/201706/12/2017
Internet address

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