On-board miniaturized L-band input filter based On TM-mode dielectric resonator for MSS applications

This paper presents a very compact L-band input filter based on TM010 mode dielectric resonators for MSS (Mobile Satellite Service) applications. A dielectric resonator (relative permittivity of 78) operating with TM010 mode represents the best trade-off in terms of volume occupation and resonator unloaded Q-factor among several dielectric resonator types considered for the proposed application. Non-resonating modes of the TM dielectric cavity have been adopted in the filter design to generate transmission zeros able to improve the rejection of the 2nd order filter when required. Prototypes of an L-band 2nd order bandpass filter have been manufactured and tested. A stable RF response between −30°C and +70°C has been demonstrated by a proprietary technique used to ensure the thermal stability of the filter. The achieved volume saving is 50% with respect to the reference standard technology.

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