6 GHz Tunable Waveguide Filter, WR-137, Used, Maser line RA Nicely made! | eBay
Realization of dielectric loaded waveguide filter with substrate integrated waveguide technique based on incorporation of two substrates with different relative permittivity - ScienceDirect
A 240-GHz Wideband Ridged Waveguide Filter Based on MEMS Process | Journal of Infrared, Millimeter, and Terahertz Waves
Lowpass Waveguide Filter With WR-42 Interface Operating from 20.2 GHz to 21.2 GHz
μWave Wizard™ Filter - Mician | Software solutions for fast & advanced EM-designs
Figure 11 from Ku-band waveguide band-pass filter with iris radius | Semantic Scholar