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Development of a Dual Polarization SIS Mixers with a Planar Orthomode Transducer at 350GHz

Development of a Dual Polarization SIS Mixers with a Planar Orthomode Transducer at 350GHz. Kuan-Yu Liu , Ming-Jye Wang, Chao-Te Li, Tse-Jun Chen, Chong-Wen Chen, Yung-Chin Chang, Hsian-Hong Chang, Wen- Chun Lu, Chuang-Pin Chiu, Yen-Pin Chang, Yen-Yu Chiang, and Chu-An Tzeng

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Development of a Dual Polarization SIS Mixers with a Planar Orthomode Transducer at 350GHz

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  1. Development of a Dual Polarization SIS Mixers with a Planar Orthomode Transducer at 350GHz Kuan-Yu Liu, Ming-Jye Wang, Chao-Te Li, Tse-Jun Chen, Chong-Wen Chen, Yung-Chin Chang, Hsian-Hong Chang, Wen- Chun Lu, Chuang-Pin Chiu, Yen-Pin Chang, Yen-Yu Chiang, and Chu-An Tzeng Academia Sinica, Institute of Astronomy & Astrophysics (ASIAA) Sheng-Cai Shi Purple Mountain Observatory (PMO) 13th Workshop on SMWRT in Eastern Asia

  2. Outline • Objectives and Specifications • Planar Orthomode Transducer at 350GHz • Implementation • Device Fabrication • IF Transmission Line • Mixer Block Assembly • Measurement Results • Future Work 13th Workshop on SMWRT in Eastern Asia

  3. Objectives • Increase survey speed (Multiple fields) • Provide on-on observation (during beam switching) • Phase referencing for fringe phase accuracy (VLBI) • Possibilities • 7-pixel dual-polarization SIS mixers array around 350GHz • 2 to 12GHz IF Band 13th Workshop on SMWRT in Eastern Asia

  4. Outline • Objectives and Specifications • Planar Orthomode Transducer at 350GHz • Implementation • Device Fabrication • IF Transmission Line • Mixer Block Assembly • Measurement Results • Future Work 13th Workshop on SMWRT in Eastern Asia

  5. Planar Orthomode Transducers at 350 GHz Around 4.0mm Cross-sectional Views Lumped Port Incoming Signals Wave Port 60um Gap Air Gap 40um Top Side View Air Gap 40um Metallic Chokes Back Short 13th Workshop on SMWRT in Eastern Asia

  6. Simulation Results of Planar OMT Smith Chart of Feed Point Return Loss and Cross Polarization 13th Workshop on SMWRT in Eastern Asia

  7. Outline • Objectives and Specifications • Planar Orthomode Transducer at 350GHz • Implementation • Device Fabrication • IF Transmission Line • Mixer Block Assembly • Measurement Results • Future Work 13th Workshop on SMWRT in Eastern Asia

  8. Device Fabrication Die of 4mm square Membrane Area 2-inch Silicon Wafer Alignment Mark Alignment Mark Devices Face Backside Etch DC Return Ground Pad RF Chokes Single SIS Junction IF Stub Devices on Membrane End Loaded Tuning 13th Workshop on SMWRT in Eastern Asia

  9. IF Transmission Line Stress Relief Sliding Contact Ribbon Bonding Test Block 13th Workshop on SMWRT in Eastern Asia

  10. Transmission Line Mixer Chip Iron Arms of Electric Magnet Back Piece Horn Piece Horn Piece Exploded Figure Mixer Block Assembly Attached Piece Back Piece 13th Workshop on SMWRT in Eastern Asia

  11. Outline • Objectives and Specifications • Planar Orthomode Transducer at 350GHz • Implementation • Device Fabrication • IF Transmission Line • Mixer Block Assembly • Measurement Results • Future Work 13th Workshop on SMWRT in Eastern Asia

  12. Performance of IF Transmission Line 13th Workshop on SMWRT in Eastern Asia

  13. Junction Performance 13th Workshop on SMWRT in Eastern Asia

  14. Noise Temperature of Mixer 13th Workshop on SMWRT in Eastern Asia

  15. Outline • Objectives and Specifications • Planar Orthomode Transducer at 350GHz • Implementation • Device Fabrication • IF Transmission Line • Mixer Block Assembly • Measurement Results • Future Work 13th Workshop on SMWRT in Eastern Asia

  16. Future Work • Measurement System of Dual Polarizations • Improvement of Chip Alignment Accuracy • Improvement of Cross Polarization Performance 13th Workshop on SMWRT in Eastern Asia

  17. Thank You for Attentions 13th Workshop on SMWRT in Eastern Asia

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