Substrate integrated waveguide bandpass filter for VSAT downlink

Abstract

Very Small Aperture Terminal (VSAT) is a transceiver station that is used to exchange information via satellite. VSAT uses frequencies that consist of uplink and downlink frequency, where the uplink frequency is greater than the downlink frequency. Uplink frequency is in a range of 5.925–6.425 GHz while the downlink frequency is at 3.7–4.2 GHz. In this research, a substrate integrated waveguide bandpass filter is designed on VSAT downlink frequency. The simulation shows good performances between 3.7–4.2 GHz of 11% fractional bandwidth. In the middle frequency, the return loss (S 11 ) is 17.76 dB and the insertion loss is 1.02 dB (S 21 ). While on the measurement result gives 3.871 dB for insertion loss (S 21 ) value and 30.87 dB for return loss (S 11 ) value.