Abstract
This article 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 frequency ranges of 40-50 and 50-60 GHz using two low-pass and high-pass filter channels. In order to integrate the diplexer in front end of a wideband millimeter-wave down-converter and evaluate the frequency response, the proposed diplexer is supported by three add-on waveguide to suspended stripline transitions. The final design of diplexer consisting of a low-pass filter with a cutoff frequency of 50 GHz, a pseudo-high-pass filter with crossover at 50 GHz, and a T-junction is analyzed and optimized together with a three-dimensional full-wave simulator. The realized diplexer features a voltage standing wave ratio of 2.5:1 across the entire operation frequency band of 40-60 GHz, low passband insertion loss of less than 2 dB in both channels, stopband rejection higher than 45 dB, and compact size with dimensions of 27 × 13 mm2 due to its intelligent and guided design and technology selection.
Published Version
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