Dual-feed circularly polarized microstrip antenna for S-Band transmitter of Synthetic Aperture Radar (SAR) system

In this research, a single patch microstrip antenna has been made, using dual-feed line technique to produce a circular polarization. A rectangular slot has been used in order to reduce antenna dimension and increase the bandwidth. To increase the gain, front-end parasitic elements has been used. The antenna has a circular polarization with unidirectional radiation pattern. The center frequency is 2.35 GHz. The obtained value of VSWR is less than 1.5 with the bandwidth of 165.9 MHz, and the gain is 6.36 dBic.