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).
|Title of host publication||IEEE Conference on Antenna Measurements & Applications (CAMA), 4-6th Dec 2017|
|Number of pages||4|
|Publication status||Published - 01 Feb 2018|
|Event||2017 IEEE Conference on Antenna Measurements & Applications (CAMA) - Ibaraki, Japan|
Duration: 04 Dec 2017 → 06 Dec 2017
|Conference||2017 IEEE Conference on Antenna Measurements & Applications (CAMA)|
|Period||04/12/2017 → 06/12/2017|