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Superconducting Planar Microwave Circuit Results Polarimeter Concept Cosmic Microwave Background polarization detector with high efficiency, broad bandwidth, and highly symmetric coupling to transition edge sensor bolometers E. Wollack a , N. Cao ab , D. Chuss a , K. Denis, W.-T. Hsieh a , S. Harvey Moseley a , G. Schneider, T. Stevenson a , D. Travers, K. U-yen a a NASA Goddard Space Flight Center, Greenbelt, Maryland, USA; b Muniz Engineering Inc., Maryland, USA Polarization modulation prior to the main aperture … Symmetric Planar OMT and Photonic Choke Waveguide Interface Four probe antennas transfer signals from waveguide to microstrip lines. The probes not only provide broadband impedance matching, but also thermally isolate waveguide and detector. In addition, we developed a new photonic waveguide choke joint design, with four-fold symmetry, to suppress power leakage at the interface. Combined with … HE11 feedhorn arrays for the best beams, and … Antenna-coupled TES bolometers with microstrip filters. The interface between 3-D horns and 2-D detector circuits … …. is implemented with a planar orthomode transducer (OMT) and photonic choke. Measured Dielectric Properties We used the ring resonator shown below to measure a dielectic loss tangent < 7x10 -4 over 10 - 45 GHz. Test Capabilities We have developed facilities to test superconducting circuit elements using a cryogenic microwave probe station, and more complete systems in waveguide Polarimeter Chips in Fabrication The chip below is currently being fabricated, together with diagnostic chips for probe station measurements of individual components. Calculated System Performance We have combined component simulations to predict the overall coupling from waveguide modes to bolometers. The result below shows the planar circuit and waveguide interface can utilize the high beam symmetry of HE11 circular feedhorns with > 99% coupling efficiency over 30% fractional bandwidth. Measured Half-wavelength ring resonator to determine the Al 2 O 3 substrate dielectric constant Network Analyzer Crygenic Probe station Microwave Probes DUT Calibratio n Substrate Infrared Blocking Window Probe Arms Camera Bias Line Filter Crossover with Terminations TRL Calibration Chip Broadband Magic-T Calibration and Test Circuits https://ntrs.nasa.gov/search.jsp?R=20080040742 2018-06-16T13:30:33+00:00Z
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