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$2\times2$ Phased Array Consisting of Square Loop Antennas for High Gain Wide Angle Scanning With Low Grating Lobes

Arpan Pal, Amit Mehta Orcid Logo, Dariush Mirshekar-Syahkal, Hisamatsu Nakano

IEEE Transactions on Antennas and Propagation, Volume: 65, Issue: 2, Pages: 576 - 583

Swansea University Author: Amit Mehta Orcid Logo

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DOI (Published version): 10.1109/TAP.2016.2637858

Abstract

A 2 × 2 array antenna comprised of conventional hybrid high impedance surface-based reconfigurable square loop antennas (SLAs) as elements is presented. The SLA element has four conducting arms and each arm is fed at the middle by vertical probes, which is connected to a 50 Ω port at the bottom of a...

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Published in: IEEE Transactions on Antennas and Propagation
ISSN: 0018-926X 1558-2221
Published: 2017
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URI: https://cronfa.swan.ac.uk/Record/cronfa29046
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Abstract: A 2 × 2 array antenna comprised of conventional hybrid high impedance surface-based reconfigurable square loop antennas (SLAs) as elements is presented. The SLA element has four conducting arms and each arm is fed at the middle by vertical probes, which is connected to a 50 Ω port at the bottom of antenna ground plane. Thus, the SLA element has four feeding ports and it is capable of generating five distinct radiation patterns by using a combination of its feeding ports. Depending upon which of its four ports are excited it can provide four high gain off-boresight tilted beams (8.9 dBi at θmax = 36°) in four different quadrants of the space (tilted beam mode). When all the four ports are simultaneously excited with phases of 0°, 0°, 180°, and 180°, it provides an axial beam (6.5 dBi) at boresight (axial beam mode). By combining these two modes the 2 × 2 array of SLAs can provide a scanning range of -60° to +60° in the elevation plane with high-gain beams (14-11.2 dBi).
Keywords: phased array antennas, beam steering, beam switched antennas
Issue: 2
Start Page: 576
End Page: 583

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