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JP2010187420A   [0005] 

PLANAR INTEGRATED WAVEGUIDE DIPLEXER FOR LOW-LOSS MILLIMETER-WAVE APPLICATIONS   [0006] 
E-Plane Double Ridge Waveguide Filters and Diplexers for Communication Systems   [0006] 
Compact and Low-Loss Bandpass Filter Realized in Silica-Based Post-Wall Waveguide for 60-GHz applications   [0006]