Wideband Beam-Scanning Circularly Polarized Inclined Slots Using Ridge Gap Waveguide

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.

[1]  E. Rajo-Iglesias,et al.  Local Metamaterial-Based Waveguides in Gaps Between Parallel Metal Plates , 2009, IEEE Antennas and Wireless Propagation Letters.

[2]  G. Montisci,et al.  Design of Circularly Polarized Waveguide Slot Linear Arrays , 2006, IEEE Transactions on Antennas and Propagation.

[3]  Alejandro Valero-Nogueira,et al.  Numerical analysis of a metamaterial-based ridge gap waveguide with a bed of nails as parallel-plate mode killer , 2009, 2009 3rd European Conference on Antennas and Propagation.

[4]  G. Montisci,et al.  Waveguide slot antennas for circularly polarized radiated field , 2004, IEEE Transactions on Antennas and Propagation.

[5]  Eva Rajo-Iglesias,et al.  Design of microwave circuits in ridge-gap waveguide technology , 2010, 2010 IEEE MTT-S International Microwave Symposium.