Design of a Quasi-Elliptic Filter in Groove Gap Waveguide Technology Using Overmoded Cavity for Low-loss High-power Applications at Q-band

This paper presents a new design of quasi-elliptic filters using groove gap waveguide technology at Q-band. The designed filter is an all-capacitive iris filter and the cross coupling is realized with the help of the phase reversed magnetic field in an overmoded waveguide cavity resonator using TE
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higher order mode. The concept is validated through a fourth order cascaded quadruplet filter designed with fractional bandwidth 1.97% at 38 GHz. The electrical performance of the filter is compared against a conventional rectangular waveguide based design for the same specifications. The high-power analysis of the filter is also carried out to demonstrate its practical applicability in high-power filter design.