Millimeter-wave imaging using preamplified diode detector

A 2-pixel imaging array was developed to demonstrate millimeter-wave imaging. Each pixel consists of a Q-band Vivaldi antenna and a preamplified diode detector, using InGaAs pseudomorphic HEMT MMIC low-noise amplifiers (LNAs) and a beam-lead Schottky-diode detector. The approach does not require local oscillator (LO) power, is compatible with MMIC technology, and can reduce the complexity and manufacturing cost of millimeter-wave imaging arrays. The preamplified diode detector exhibited 17-V/ mu W responsivity at 44 GHz and -75-dBm tangential sensitivity at 1-MHz video bandwidth. The array demonstrated millimeter-wave imaging of three vehicles in a parking lot. >

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