Design of the compact band-pass filter utilizing dielectric loaded waveguide resonators

A design of a compact Ku-band four pole band-pass filter is reported. The filter is based on two dual-mode dielectric loaded waveguide (WG) resonators providing a significant reduction of the sizes as compared to its single mode counterpart. Each resonator is comprised of a square shaped cut-off waveguide loaded with a silica glass plate. The filter is realized using a quadruplet cell, which allows two symmetric transmission poles to be placed at an arbitrary distance from the pass-band edges. This is a welcome feature making this filter useful for both Tx and Rx duplexer channels. A number of numerical issues are addressed concerning the modelling using high frequency structure simulator (HFSS). Experimental results are compared with the simulations validating the design approach.