Argus: A 16-pixel Millimeter-Wave Spectrometer for the Green Bank Telescope
We report on the development of Argus, a 16-pixel spectrometer, which will enable fast astronomical imaging over the 85–116 GHz band. Each pixel includes a compact heterodyne receiver module, which integrates two InP MMIC low-noise amplifiers, a coupled-line bandpass filter and a sub-harmonic Schottky diode mixer. The receiver signals are routed to and from the multi-chip MMIC modules with multilayer high frequency printed circuit boards, which includes LO splitters and IF amplifiers. Microstrip lines on flexible circuitry are used to transport signals between temperature stages. The spectrometer frontend is designed to be scalable, so that the array design can be reconfigured for future instruments with hundreds of pixels. Argus is scheduled to be commissioned at the Robert C. Byrd Green Bank Telescope in late 2014. Preliminary data for the first Argus pixels are presented.
Additional Information© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE). Published: 23 July 2014. The authors thank Mary Soria and Heather Owen for assembling the MMIC receiver modules. This work was carried out in part at the Jet Propulsion Laboratory, which is operated by the California Institute of Technology for NASA. The Argus instrument is funded by NSF ATI grant 1207825 and preliminary technology development was supported by NSF ATI grant 0905855.
Published - Sieth_2014p91530P.pdf