Reconfigurable doublet dual-mode cavity filter designs providing remote controlled center frequency and bandwidth re-allocation

A unique high Q dual-mode cavity filter design for remote controlled reallocation of center frequency and bandwidth is introduced. It builds on a sidewall arrangement of cylindrical cavities that allows independent movement of the end-walls at both sides. The dual mode cavities are coupled as doublets for the realization of transmission zeros. All cavity end-walls situated at the same side are synchronously adjusted, i.e., the reconfiguration of the overall filter requires only two actuation drives
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. This solution has been validated by 2-order and 5-order filter designs implemented with TE 113 dual-mode cavities at 11.2GHz. The results of the EM-analysis of the 5-order filter and the measured remote controlled hardware of the 2-order design demonstrate the capability of center frequency and bandwidth reallocation.