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5 May 2006 Unamplified direct detection sensor for passive millimeter wave imaging
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We have demonstrated a high efficiency package for zero bias Sb-based backward tunnel diodes developed for passive millimeter wave imaging. Flip-chip mounting of detector MMICs onto quartz substrates permit placement of the detector directly within the WR-10 waveguide feeds for diagonal horn antennas. This arrangement minimizes the losses between the detectors and antennas while providing an impedance match over a majority of W band. A 2x2 array of radiometers was fabricated, assembled, and measured using coherent measurement techniques. The resulting noise equivalent temperature difference, calculated assuming a 30 Hz frame rate is 10 degrees K.
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Jonathan Lynch, Harris Moyer, Joel Schulman, Phillip Lawyer, Ross Bowen, James Schaffner, Debabani Choudhury, Jim Foschaar, and David Chow "Unamplified direct detection sensor for passive millimeter wave imaging", Proc. SPIE 6211, Passive Millimeter-Wave Imaging Technology IX, 62110I (5 May 2006);

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