Very-compact Waveguide Bandpass Filter based on Dual-Mode TM Cavities for Satellite Applications in Ku-band

The design of a Ku-band bandpass filter for satellite applications centered at 14.25GHz with 500 MHz bandwidth (FBW=3.5%) is presented in this paper. The filter is based on TM dual-band resonator technology allowing for a reduction of about 50% of the filter length with respect to regular TE dual-mode filters resonators while maintaining a high Q-factor . The filter is composed of a total of 4 dual-mode TM cavities. Dimensions are 43×45×47mm
³
, mass is 110g and the Insertion Loss is below 0.35dB in the passband. Measurements show good correlation with the design.