Development of Equilateral Triangular Array Antenna with Truncated-Tip for Circularly Polarized-Synthetic Aperture Radar Sensor Application

In this paper, we obtain the development of triangular array antenna using corporate feeding-line for Circularly Polarized-Synthetic Aperture Radar (CP-SAR) sensor embedded on small Unmanned Aerial Vehicle (UAV) with compact, simple, and efficient configuration. We use Computer Simulation Technology (CST) version 2016 from corporate company CST STUDIO SUITE to realize the Method of Moments (MoM). The array antenna is consist of eight elements or eight patches of simple equilateral triangular patch with adding truncated corner of each element at resonant frequency, f = 1.25 GHz. Proximity coupled feed, perturbation segment, single feed method are applied to generate the circular polarization wave from radiating patch. The corporate feeding-line design is implemented by combining some T-junctions to distribute the current from input port to radiating elements and to reach 2 x 4 elements of Left Hand Circularly Polarized (LHCP) antenna. The performance results of this antenna, especially for gain and axial ratio (Ar) at the resonant frequency are consecutively 13.49 dBic and 1.99 dB. Furthermore, the two-beams appeared at boresight in elevation plane have similar values each other i.e. for average beamwidth of 12 dBic-gain and the 3 dB-Ar are about 12deg and 38deg, respectively.