Journal
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
Volume 18, Issue 4, Pages 757-761Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LAWP.2019.2902037
Keywords
Beam steering; cavity-backed antennas; phased arrays; slot antennas; tunable circuits and devices
Funding
- National Science Foundation [ECCS 1443942]
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The electronically steerable parasitic array radiator (ESPAR) is an inexpensive way to achieve beam steering. Planar ESPARs usually exhibit narrow fractional bandwidth (FBW) in terms of both impedancematching and beam squinting. Herein, an E-plane three-element ESPAR using cavity-backed slot antennas is presented to demonstrate a wider FBW, i.e., 4%, by investigating not only S11 but also beam squinting. It is found that a tunable load which uses a fixed inductor, a varactor, and a delay line can provide a much larger impedance tuning range compared to that without the inductor. This tunable load is critical to enhance the FBW by considering beam squinting. This ESPAR is able to scan from -26 degrees to 20 degrees in the E-plane, operating around 5.15 GHz. The measured peak gain is between 5.52 and 6.05 dBi at all scan angles. The radiation patterns are measured at different scan angles in the E-plane. In addition, they are measured at different frequencies to demonstrate the beam squinting performance.
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