The principles of construction of millimeter wave detectors based on low-barrier Schottky diodes and planar antennas are discussed. The modified planar slot antenna with low beam spillover at the resonant frequency of 94 GHz has been developed. Experiments have been carried out to investigate detecting characteristics of the diodes with differential contact resistances R j ¼ 1 Ä 1000 kΩ at zero bias. Experimental data are well correspond to calculations in a simple model of detector. At R j ¼ 20 Ä 100 k Ω the maximum of rf-todc voltage sensitivity -more than 10000 V/W -is obtained. At lower values of R j ¼ 2 Ä 6 k Ω a better noise equivalent power (NEP), around 10 −12 W Hz −1/2 , is predicted.

We discuss the concept of developing a millimeter-wave multielement matrix receiver on the basis of planar antennas with directly coupled low-barrier Schottky diodes. Three main problems are considered which involve choosing and developing a design of the planar antenna coupled with the low-barrier Schottky diode, optimizing the parameters of the low-barrier Schottky diodes for obtaining maximum sensitivity, and ensuring compact arrangement with weak mutual influence of the planar detectors in a two-dimensional array. We propose a design of the slot antenna with an active resistance of about 800 Ω at a resonant frequency of 94 GHz. The detection characteristics of diodes with the differential Schottky-barrier resistance in the range R j = 0.4-1000 kΩ for a zero bias are studied experimentally. The mutual influence of the neighboring antennas is examined for developing the multielement radio-imaging system. The conditions of weak cross influence of the closely located planar detectors are determined.

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Zero-bias detectors based on low-barrier Schottky diodes and planar slot antennas are investigated at 94 GHz.Diodes with differential contact resistances RJ-1.1000 kQ at zero bias are used. The better voltage responsivity -more than 10000 V/W-is obtained at RJ-20.100 kQ. At lower values of RJ-2.÷6 kQ a better noise equivalent power NEPA10-12 W.Hz-l/2, is observed. Experimental data are compared with the simulation in a simple model of detector.