A Wideband, Sharp Roll-Off U-Band Diplexer in Suspended Stripline Technology

This paper presents a low-loss, sharp roll-off, and wideband millimeter-wave contiguous diplexer implemented on 0.127 mm-thick TLY5 dielectric material to separate U-band frequency range into two jointed ranges of 40-50 GHz 50-60 using low-pass high-pass filter channels. In order integrate the in front end down-converter evaluate response, proposed is supported by three add-on waveguide-to-suspended-stripline transitions. The final design consisting with cut-off 50 GHz, pseudo-high-pass crossover at T-junction analyzed optimized together 3D full-wave simulator. realized features VSWR 2.5 : 1 across entire operation band 40-60 low passband insertion loss less than 2 dB both channels, stopband rejection higher 45 dB, compact size dimensions 27 × 13 mm2 due its intelligent guided technology selection.