Bandstop filters on double ridge waveguide with wide matched passbands

Abstract

In this paper, design of bandstop filters using double ridge waveguide technology is presented. The proposed filter has a very wide passband that can cover the whole standard frequency span of the double ridge waveguide. In order to achieve the required matching level in the passband, multi-section impedance inverters are used between every cavity resonators. A 3rd order filter is considered to prove the design procedure.