Wideband Aperture-Coupled Microstrip Array Antennas in Circular Polarization for Ka Band Satellite Communications Applications

This paper presents wideband aperture-coupled microstrip array antenna designs in circular polarization operation for Ka band satellite communications applications. The aperture shape can be adjusted to improve the operating bandwidth, and a H-shaped aperture with proper dimensions is shown to the array designs. Two array cases are demonstrated by simulations where the 1 by 4 array has the operating frequencies from 26.6 GHz to 36.5 GHz and the 4 by 4 array exhibits the frequency range from 20.4 GHz to 38.2 GHz.