Title :
Wideband Beam-Scanning Circularly Polarized Inclined Slots Using Ridge Gap Waveguide
Author :
Al Sharkawy, Mohamed ; Kishk, Ahmed A.
Author_Institution :
Dept. of Electr. & Comput. Eng., Concordia Univ., Montreal, QC, Canada
Abstract :
A wideband circularly polarized (CP) frequency-dependent slot antenna array is designed for beam scanning using the ridge gap waveguide (RGW) technology. The merge between both the printed and the RGW technologies for providing a wideband CP antenna array is newly implemented here. The designed CP antenna has been fabricated, and measurement results are provided and compared to the full-wave analysis. A measured antenna axial ratio (AR) and impedance bandwidths of ~ 21% are achieved from 12.5 to 15.5 GHz. The proposed antenna preserves its CP characteristics of AR below 3 dB while achieving continuous frequency beam scanning from backward to forward directions including broadside radiation that covers +15° to -15° with an average gain of 12.5 dBi.
Keywords :
antenna radiation patterns; broadband antennas; microwave antenna arrays; ridge waveguides; slot antenna arrays; RGW technology; antenna axial ratio; impedance bandwidths; ridge gap waveguide technology; wideband CP antenna array; wideband beam-scanning circularly polarized inclined slots; wideband circularly polarized frequency-dependent slot antenna array; Antenna arrays; Antenna measurements; Arrays; Frequency measurement; Gain; Slot antennas; Waveguide discontinuities; Beam scanning; circularly polarized; ridge gap waveguide (RGW); slots array;
Journal_Title :
Antennas and Wireless Propagation Letters, IEEE
DOI :
10.1109/LAWP.2014.2331679
