Compact multiband waveguide bandstop filter with half–wavelength resonators in E–plane

This paper presents a novel realization of a compact dual-band bandstop filter, implemented with half-wavelength resonators in the E-plane. The filter implementation with half-wavelength resonators printed on the opposite sides of dielectric layer achieves a size reduction, while preserving the characteristics of the filter. The filter is designed in waveguide technology. The structure consists of a printed double-sided thin dielectric substrate to form an insert that is positioned in the E-plane of a standard rectangular waveguide WR-90. The proposed design achieves independent control of each single bandstop filter by simply adjusting the length of the half-wavelength resonators. The proposed dual-band bandstop waveguide filter is designed for the center frequencies of 9 GHz and 11 GHz.