A Compact and Simply-Constructed All-Metal Circularly Polarized Ridge-Waveguide Slotted Antenna Array for Vehicle Mounted Satcom on the Move (SOTM) Communication Application

In this paper, a novel circularly polarized (CP) ridge-waveguide slotted antenna array is proposed for vehicle used Satcom on the Move (SOTM) applications. The designed closely following required factors generating circular polarization. constructed symmetrical single-ridge waveguide. Each element consists of pair inclined slots opened narrow walls, and longitudinal bottom U-shaped wall are able to radiate orthogonal electric-fields independently with phase-difference 90°. After vector superposition in far-field by using design, polarization could be realized extremely low axial ratio theoretically. Several essential parameters affecting CP performance also studied paper. To verify feasibility approach, four-element simulated, fabricated measured. Results show that obtained prototype achieves measured impedance bandwidth 14.74% from 9.24 GHz 10.71 S11 <−10 dB, 3-dB 19.1% 9.0 10.9 GHz.