Circularly polarized microstrip antenna array for UAV application

This paper present a circularly polarized microstrip antenna array for Unmanned Aerial Vehicle (UAV). The antenna element is designed using conventional rectangular microstrip antenna which is electromagnetically coupled fed by a microstrip line. The 1×4 element microstrip antenna array is then assembled on the surface of UAV cylindrical fuselage. The measurement result showed for 1x4 element antenna array that it operates at frequency 5.6 GHz with return loss characteristic of - 22.24 dB. The impedance bandwidth at VSWR <; 2 is 720 MHz. Moreover, the radiation pattern show omnidirectional. Both simulation and experimental results show the proposed antenna radiation characteristics can be achieved as specified.