Superconducting quantum detectors

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Finline mixers for imaging arrays

ASTR SOC P 75 (1995) 358-362

Authors:

G YASSIN, R PADMAN, S WITHINGTON

Spectral-domain analysis of submillimetre-wave microstrip filters

International Journal of Infrared and Millimeter Waves 14:10 (1993) 1975-1984

Authors:

S Withington, G Yassin

Abstract:

We consider the cut-off frequencies of high-order modes in boxed submillimetre-wave microstrip filters. It is shown that many of the filters in use at the present time are not cut off in the way that the designers imagine. It is also shown that for ease of manufacture the height of the microstrip channel should be 0.7 times the width and the thickness of the quartz substrate should be 0.5 times the width. This optimum geometry suggests that the upper frequency limit of conventional waveguide components is 1THz. 漏 1993 Plenum Publishing Corporation.

THE COSMIC ANISOTROPY TELESCOPE

ASTRONOMY & ASTROPHYSICS 277:1 (1993) 314-320

Authors:

M ROBSON, G YASSIN, G WOAN, DMA WILSON, PF SCOTT, AN LASENBY, S KENDERDINE, PJ DUFFETTSMITH

THE ELECTRICAL CHARACTERISTICS OF A CONICAL HORN-REFLECTOR ANTENNA EMPLOYING A CORRUGATED HORN

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION 41:3 (1993) 357-361

Authors:

G YASSIN, M ROBSON, PJ DUFFETTSMITH

Rotation of elliptical oscillation in a molecular beam maser in a weak axial magnetic field

Physics Letters A 113:5 (1985) 248-250

Authors:

G Yassin, DC Lain茅

Abstract:

The oscillation polarization ellipse in a molecular beam disc resonator maser is shown to be strongly rotated when a weak axial magnetic field is applied. The phenomenon is a microwave analogue of a similar behaviour observed in gas lasers, and is interpreted here in terms of lumped resonator anisotropies. 漏 1985.