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.
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 frequency ranges of 40-50 GHz and 50-60 GHz using two low-pass and high-pass filter channels. In order to integrate the diplexer in the 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 cut-off 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 3D full-wave simulator. The realized diplexer features a VSWR 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.
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