Spiral antenna with reconfigurable HIS using liquid crystals for monopulse radar application
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 differen...
| Main Authors: | , |
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| Format: | Conference or Workshop Item |
| Language: | English English |
| Published: |
Institute of Electrical and Electronics Engineers Inc.
2017
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/61407/ http://irep.iium.edu.my/61407/ http://irep.iium.edu.my/61407/1/merged%20-%20CAMA%202017.pdf http://irep.iium.edu.my/61407/7/61407_Spiral%20antenna%20with%20reconfigurable%20HIS%20using%20liquid%20crystals_SCOPUS.pdf |
| Summary: | 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). |
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