Smooth walled feed horns for mm and submm radio astronomy
Institute of Electrical and Electronics Engineers (IEEE) (2013) 1-2
650 GHz SIS mixer fabricated on silicon‐on‐insulator substrate
Electronics Letters Institution of Engineering and Technology (IET) 49:20 (2013) 1273-1275
The James Clerk Maxwell Telescope Nearby Galaxies Legacy Survey IX: $^{12}$CO $J=3\to2$ Observations of NGC 2976 and NGC 3351
(2013)
A simple method to widen the IF bandwidth of a high frequency SIS mixer
24th International Symposium on Space Terahertz Technology (2013)
Abstract:
In this paper, we describe a simple method for widening the instantaneous frequency (IF) bandwidth of a high frequency superconductor-insulator-superconductor (SIS) mixer. This method requires only a standard PCB technology, without incurring any difficulties or complication in altering the tunnel junction fabrication. It involves the use of a simple multi-stage IF transformer to match the dynamic output impedance of the SIS mixer to a 50 Ω load over a wide IF bandwidth. We use an existing 650 GHz SIS mixer chip as an example to illustrate the methodology of the IF transformer design. In this example, we show how we widen the IF bandwidth of the mixer to operate over 4–12 GHz bandwidth using this simple impedance matching method.
Easy to Fabricate Feeds for Astronomical Receivers
Institute of Electrical and Electronics Engineers (IEEE) (2013) 15-18