Enhancements to - and Submillimetre - Integrated Circuit Receivers.

Details Enhancements to - and Submillimetre - Integrated Circuit Receivers. Enhancements to - and Submillimetre - Integrated Circuit Receivers.

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt.........5v&link_type=abstract

Thesis (PH.D.)--UNIVERSITY OF ALBERTA (CANADA), 1995.Source: Dissertation Abstracts International, Volume: 57-03, Section: B, pa

Astronomy and Astrophysics

Astronomy

Scientific paper

An important area of radio astronomy instrumentation is the development of sensitive receivers at millimetre - and submillimetre-wavelengths. Over the last decade, there has been steady progress in advancing the technology from using receivers based on mechanically machined waveguides and horn antennas to transmission lines and antennas fabricated using integrated circuit techniques. The motivation has been to simplify the fabrication of the receivers through the use of photolithography and etching. It is hoped that this will eventually lead to the development of focal plane arrays, which have many elements placed side-by-side forming a radio camera. The first part of this thesis addresses one of the problems with the integrated circuit technology, namely the fixed nature of the circuits, by examining one type of electrically-adjustable tuning. In those experiments, the bias voltage was modulated across the active device so as to change its tuning. Unfortunately the tuning effect was severely limited by the electrical nonlinearity of the device. Another part of this thesis builds upon the integrated nature of modern receivers by adding what, up until now, has been an external component: the Josephson effect suppression electromagnet. This technique will allow the receiving elements to be much simpler and smaller than would otherwise be the case. Finally, the last part of this thesis examines another method of constructing antennas and transmission lines using integrated circuit techniques. This work shows the feasibility of integrating a waveguide fabricated with integrated circuit technology with a diagonal horn antenna. This technique will provide another option for receiver designers.

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