6–18GHz single ridge waveguide UWB absorbent harmonic filter

In this paper, a new type of 6-18GHz UWB absorbent harmonic filter is present which constructed by a primary single ridge waveguide and single row accessorial rectangular waveguide loads. Comparing with of the 2-4GHz UWB absorbent harmonic filter presented in above paper, the 6-18GHz filter has lower SWR and insert loss in 6-18GHz ultra-wide pass band, and also has lower SWR and higher isolation in 26.5-40GHz ultra-wide stop band.