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18 April 2008 A wideband radiometer module for an unamplified direct detection scalable W-band imaging array
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A W-band unamplified direct detection radiometer module is described that provides a wideband response and is scalable to large arrays. The radiometer design is intended to provide sufficient sensitivity for millimeter wave imaging applications with a goal of 2K noise equivalent temperature difference (NETD) at a 30 Hz frame rate. This effort leverages previously reported device scaling to increase sensitivity. We present a radiometer module designed for 60 GHz RF bandwidth that utilizes HRL's antimonide-based backward tunnel diode. An impedance matching circuit with on- and off-chip elements, as well as ridged waveguide, provides a wideband match to the detectors. Modules were designed with two different microwave substrates: 125 micron thick quartz and 100 micron thick alumina. flip-chip bonding of the detectors is amenable to automated pick-and-place for high volume manufacturing. The modular nature of the array approach allows large arrays to be manufactured in a straightforward manner. We present the design approach along with both electromagnetic simulations and measured performance of the modules. This work was supported by phase II of DARPA's MIATA program.
© (2008) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
James H. Schaffner, Jonathan J. Lynch, Keith V. Guinn, Joel N. Schulman, Harris P. Moyer, Ross Bowen, and Marcel Musni "A wideband radiometer module for an unamplified direct detection scalable W-band imaging array", Proc. SPIE 6948, Passive Millimeter-Wave Imaging Technology XI, 694807 (18 April 2008);

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