A 140-170-GHz low-noise uniplanar, subharmonic schottky receiver

A 150-GHz Schottky-diode subharmonic receiver based on a coplanar-waveguide -fed double-folded-slot (DFS) antenna is presented in this paper. The DFS a ntenna is placed on an extended hemispherical high-resistivity silicon subs trate lens to achieve a high directivity and a high coupling to a Gaussian beam efficiency. The uniplanar receiver results in a 12+/-0.5-dB measured d ouble-sideband conversion loss at 144-152 GHz for a 8-10 mW local-oscillato r power at 77 GHz, and has a wide-band less than or equal to 13-dB conversi on loss over 30 GHz of bandwidth (140-170 GHz). The measured conversion los s includes silicon lens absorption and reflection losses, as well as IF mis match losses. The applications are in new small aperture (7.5-cm lenses) co llision-avoidance radars at 150 GHz.