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The development of portable millimeter-wave gas sensors that operate using pulsed Fourier transform detection schemes and meet the stringent demands for space deployment depend on the advancement of several key technologies. A prototype systema that operates at 90-100 GHz has already been demonstrated with efforts now focusing on a system to target the 31,3 ← 22,0 (J ′′ K′′ a ,K′′ c ← J ′ K′ a,K ′ c ) H2O transition at 183.310 GHz. The performance properties of a 180-190 GHz CMOS-based pulsed transmitter and heterodyne receiver set has already proven viable for system incorporation.b Another key component is the hybrid coupling plate that interfaces with the integrated circuit transmitter and receiver chips and serves as the cavity end mirror of the resonant sample cell. The performance of the waveguide fed version of this cavity system will be discussed including demonstrative examples of cavity quality factor measurements (Q>10000) and molecular detections deploying both CMOS and traditional mm-wave sources/detectors. System performance will be discussed in the context of realizing a dual band system capable of near simultaneous detection of both H2O (at 183.310 GHz) and D2O (at 80.359 GHz).

180 GHZ RESONANT CAVITY FOR FOURIER TRANSFORM MILLIMETER-WAVE IN-SITU SENSING