aqora

Low Noise Single Sideband SIS Mixers for MM and Submillimeter Radio Astronomy [abstract]

Alexandre Karpov, J. Blondel, M. Voß +3 more

Mar 1, 19980 citations

An 84-116 GHz Fixed-Tuned Integrated SIS Mixer-Preamplifier with Ultra-Wide-Band IF and Quantum-Limited Sensitivity

S.-K. Pan, Anthony R. Kerr, M.W. Pospieszalski +10 more

Jan 1, 20030 citations

Low noise Nb-based SIS mixer for sub-millimeter wave detection

Ming-Jye Wang, Hongwei Cheng, Y.H Ho +2 more

Journal of Physics and Chemistry of SolidsSep 1, 20017 citations

Wide-Band, Ultra Low Noise MM-Wave Mixers with a Single Tuning Element

Antti V. Räisänen, Denis Crété, P. L. Richards +1 more

Several SIS quasiparticle mixers have been designed and tested for the frequency range from 80 to 115 GHz. The sliding back short is the only adjustable RF-tuning element. The RF-filter reactance is used a s a fixed RF-matching element. A mixer which uses a single 2 × 2 μm2Pb-alloy junction in a 1/4-height waveguide mount has a coupled conversion gain of GM(DSB) = 2.6 ± 0.5 dB with an associated noise temperature of TM(DSB) = 16.4 ± 1.8 K at the best DSB operation point. The receiver noise temperature TR(DSB) is 27.5 ± 0.8 K for the test apparatus. This mixer provides a SSB receiver noise temperature below 50 K over the frequency range from 91 to 96 GHz, the minimum being TR(SSB) = 44 ± 4 K. Another mixer with an array of five 5 × 5 μm2junctions in series has much lower noise TM(DSB) = 6.6 ± 1.6 K, but less gain GM(DSB) = -5.1 ± 0.5 dB.Several SIS quasiparticle mixers have been designed and tested for the frequency range from 80 to 115 GHz. The sliding back short is the only adjustable RF-tuning element. The RF-filter reactance is used a s a fixed RF-matching element. A mixer which uses a single 2 × 2 μm2Pb-alloy junction in a 1/4-height waveguide mount has a coupled conversion gain of GM(DSB) = 2.6 ± 0.5 dB with an associated noise temperature of TM(DSB) = 16.4 ± 1.8 K at the best DSB operation point. The receiver noise temperature TR(DSB) is 27.5 ± 0.8 K for the test apparatus. This mixer provides a SSB receiver noise temperature below 50 K over the frequency range from 91 to 96 GHz, the minimum being TR(SSB) = 44 ± 4 K. Another mixer with an array of five 5 × 5 μm2junctions in series has much lower noise TM(DSB) = 6.6 ± 1.6 K, but less gain GM(DSB) = -5.1 ± 0.5 dB.

European Microwave Conference (EuMC)Sep 1, 19862 citations

MM wave quasioptical SIS mixers

Qing Hu, C. A. Mears, P. L. Richards +1 more

The authors have tested the performance of planar SIS (superconductor-insulator-superconductor) mixers with log-periodic antennas at near millimeter and submillimeter wave frequencies from 90 to 360 GHz. The large omega R/sub N/C product ( approximately 10 at 90 GHz) of the Nb/NbO/sub x//Pb-In-Au junctions requires an integrated inductive tuning element to resonate the junction capacitance at the operating frequencies. Two types of integrated tuning element were used which were designed with the aid of measurements using a Fourier transform spectrometer. Preliminary results indicate that the tuning elements can give very good mixer performance up to at least 200 GHz. An inductive wire in parallel with a 5-junction array gives a minimum mixer noise temperature of 115 K (DSB) at 90 GHz with a FWHM (full width at half maximum) bandwidth of 8 GHz. An open-ended microstrip stub in parallel with a single junction gives minimum mixer noise temperatures at 150 and 200 K (DSB) near 90 and 180 GHz with FWHM bandwidths of 4 and 3 GHz, respectively. The relatively high mixer noise temperatures compared to those of waveguide SIS mixers in a similar frequency range are attributed mainly to the losses in the optical system.>The authors have tested the performance of planar SIS (superconductor-insulator-superconductor) mixers with log-periodic antennas at near millimeter and submillimeter wave frequencies from 90 to 360 GHz. The large omega R/sub N/C product ( approximately 10 at 90 GHz) of the Nb/NbO/sub x//Pb-In-Au junctions requires an integrated inductive tuning element to resonate the junction capacitance at the operating frequencies. Two types of integrated tuning element were used which were designed with the aid of measurements using a Fourier transform spectrometer. Preliminary results indicate that the tuning elements can give very good mixer performance up to at least 200 GHz. An inductive wire in parallel with a 5-junction array gives a minimum mixer noise temperature of 115 K (DSB) at 90 GHz with a FWHM (full width at half maximum) bandwidth of 8 GHz. An open-ended microstrip stub in parallel with a single junction gives minimum mixer noise temperatures at 150 and 200 K (DSB) near 90 and 180 GHz with FWHM bandwidths of 4 and 3 GHz, respectively. The relatively high mixer noise temperatures compared to those of waveguide SIS mixers in a similar frequency range are attributed mainly to the losses in the optical system.>

IEEE Transactions on MagneticsMar 1, 198932 citations

Development for a wideband 100 GHz SIS mixer

Yuto Kozuki, H Ishida, Yohei Hasegawa +14 more

Jan 1, 20152 citations

Wide-band low noise MM-wave SIS mixers with a single tuning element

Related papers

Wide-band low noise MM-wave SIS mixers with a single tuning element

Related papers