Electromagnetic fields - Campi elettromagnetici
Our research goal is to reduce the mass and size of such filters by the adoption of a TM dual-mode cavity loaded with a high-permittivity cylinder.
Two papers about this topic have been already published:
"Ultra-compact pseudoelliptic waveguide filters using TM dual-mode dielectric resonators" Microwave Conference Proceedings (APMC), 2011 Asia-Pacific
"Ultra-compact filters using TM dual-mode dielectric-loaded cavities with asymmetric transmission zeros" Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International
Our research is now focusing on the implementation of dual band and reconfigurable filters by using such technlology
Reliability is a major issue for any satellite since it is almost impossible to envisage any repair work during the full mission lifetime e.g. 15 years for today’s telecommunications satellites. Redundancy is implemented in order to reduce the failure rate of equipment.For this purpose, high reliability switches is of greatest importance for RF equipment incorporating redundancy schemes. Electrostatic RF MEMS show great potentialities for space; still their reliability is hampered by different failure mechanisms. Dielectric charging has been identified as the main failure mechanism for redundancy switches, where the switches are required to be kept activated (i.e. polarized with continuous voltage) for long time.