Analysis Two Beams LHCP Array Triangular Truncated Microstrip Antenna for CP-SAR Sensor

The development of a Circularly Polarized Synthetic Aperture Radar (CP-SAR) attached to a micro-satellite is able to retrieve physical information on the earth's surface, such as the cryosphere, global vegetation, and future disaster areas. In this paper, we obtain the configuration of the Left-Hand Circular Polarization (LHCP) array four patches stack triangular truncated microstrip antenna. This construction use the basic corporate feed microstrip-line with modified lossless T-junction power divider on radiating patch for CP-SAR sensor. Here, we discuss two characteristics antenna that has two beams, i.e. simulated and measured triangular truncated microstrip-line feed antenna at occurred frequency, f = 5.2 GHz for simulation and f = 5.8 GHz for measurement. The simulated antenna is designed by using the Moments Method (MoM) for CP-SAR sensor. The results of gain and S-parameter both for simulation and measurement at the each target frequency show successively about 9.74 dBic and 13.1 dBic of gain and -10.78 dB and -8.49 dB of S-parameter. Moreover, the impedance bandwidth of this antenna both simulation and measurement are around 410 MHz (7.89%) and 100 MHz (2.63%), respectively.