SIS Mixer for 385-500 GHz with On-Chip LO injection (original) (raw)
2007
We present the design and first experimental results of a 385-500 GHz fixed-tuned double sideband (DSB) receiver based on a superconductor-insulator-superconductor (SIS) junction mixer with on-chip LO injection circuitry. At high frequency, branch waveguide couplers are difficult to manufacture with required accuracy as the branches (slots) become extremely narrow. In order to solve this problem, we propose a coupler integrated
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A 550 GHz Dual Polarized Quasi-Optical SIS Mixer
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We describe the design, fabrication, and the performance of a low-noise dual-polarized quasi-optical superconductor insulator superconductor (SIS) mixer at 550 GHz. The mixer utilizes a novel cross- slot antenna on a hyperhemispherical substrate lens, two junction tuning circuits, niobium trilayer junctions, and an IF circuit containing a lumped element 180o hybrid. The antenna consists of an orthogonal pair of twin-slot antennas, and has four feed points, two for each polarization. Each feed point is coupled to a two-junction SIS mixer, and therefore, for each polarization there are two IF outputs and four junctions, for a total of eight junctions on the chip. Due to the mixer structure and the use of series bias of the junction pairs, it turns out that the two IF outputs for a given polarization are 180o out of phase, requiring a 180o hybrid to combine the IF outputs. The hybrid is implemented using a combination of lumped element/microstrip circuit located inside the mixer block....
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