Analysis of A Semi-Circular Cavity BPF with RF-MEMS Switches for 5G Applications and X-band Satellite Communication applications

This study designs and analyses a compact dual-band reconfigurable semi-circular cavity BPF. RF-MEMS switches were proposed on both sides of the 50Ω microstrip transmission lines in order to achieve reconfigurability. An electrostatically actuated shunt capacitive shunt type RF-MEMS switch is designed and tunability of the BPF is attained when the two switches move from upstate to downstate. The actuation voltage to move the switch downwards is 6.5V and the switch operates at a transition time of 30µS with a capacitance ratio of 10. Return loss of -22dB is obtained at 3.7GHz when the switch is in OFF state and return loss of -32dB is obtained at 6.7GHz when the switch is in ON state and is applicable for n77, n78 and n79 5G wireless communication applications and X-band satellite communication applications. Bandpass filter provides a frequency shift of 3GHz when both the switches are in ON state (or) OFF state. Return loss of -22dB is obtained at 3.7GHz when the switch is in the OFF state, while return loss of -32dB is obtained at 6.7GHz when the switch is in the ON state. This is suitable for 5G wireless communication applications (n77, n78, and n79) as well as X-band satellite communication applications. A 3GHz frequency shift is provided by a bandpass filter when both switches are in the ON or OFF position. BPF is designed to operate at a frequency range of 1–10 GHz that can be adjusted for different applications. By simulating the switch design in a COMSOL Multiphysics the features of the switch were examined, and the results were compared with theoretical calculations. The HFSSV.13 tool has been used to observe and present the BPF's tunable properties.