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We are developing two prototype millimeter-wave radars at 95 and 183 GHz with a frequency-modulated continuous-wave (FMCW) architecture. The 95 GHz radar is intended to measure distributions and velocities of small particles in space, such as those ejected in cometary jets. The 183 GHz radar is to operate across the atmospheric water absorption line to perform humidity sounding inside clouds. Here...
We report on the design, fabrication and characterization of a high-power and broadband 105–120 GHz Schottky diode frequency tripler based on a novel on-chip power combining concept that allows superior power handling than traditional approaches. The chip features twelve anodes on a 50 thick GaAs substrate. At room temperature, the tripler exhibits a 17% 3 dB bandwidth and a peak...
Detection sensitivity of a frequency-modulated continuous-wave (FMCW) radar can be limited by transmitter noise leaking into the receiver. For submillimeter-wave radars relying on high harmonic frequency-multiplication factors N>>1, phase noise typically dominates this leakage because it is amplified by 20log(N). A feed-forward phase noise cancellation circuit can suppress the effect of this...
Over the last few years, researchers have determined that sea spray from breaking waves can have a large effect on the magnitude and distribution of the air-sea energy flux at hurricane-force wind speeds. Characterizing the fluxes requires estimates of the height-dependent droplet size distribution (DSD). Currently, the few available measurements have been acquired with spectrometer probes, which...
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