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A Technique for Reducing the Grating Lobes of the Molonglo Observatory Synthesis Telescope

Published online by Cambridge University Press:  25 April 2016

S. W. Amy  and
M. I. Large
S. W. Amy
Affiliation:
School of Physics, University of Sydney, NSW 2006
M. I. Large
Affiliation:
School of Physics, University of Sydney, NSW 2006
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Abstract

The grating ring response of the Molonglo Observatory Synthesis Telescope can be reduced by the installation of 60° phase switches into each of 176 signal paths of the antenna. A suitable voltage-controlled UHF phase switch has been designed and tested at 843 MHz. It consists of two varactor diodes in series with a microstrip. Although designed to provide only two phase states, the device works well as a continuous phase shifter with a coefficient of ∼3° per volt. Details of the design, performance and application to the radio telescope are given.

Type
Instruments and Basic Astronomy
Information
Publications of the Astronomical Society of Australia , Volume 8 , Issue 3 , 1990 , pp. 308 - 311
Copyright
Copyright © Astronomical Society of Australia 1990

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