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Technique for reduction of noise resistance in a balanced low-noise amplifier for beam-steering applications

Published online by Cambridge University Press:  11 July 2013

David M.P. Smith  and
Bert E.M. Woestenburg
David M.P. Smith*
Affiliation:
Department of Electrical and Electronic Engineering, Stellenbosch University, Stellenbosch 7600, South Africa. Phone: +31 521 595 152
Bert E.M. Woestenburg
Affiliation:
ASTRON, Postbus 2, 7990 AA, Dwingeloo, The Netherlands
*
Corresponding author: D.M.P. Smith Email: smith@astron.nl
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Abstract

This paper, following up on the previous work, investigates the effect of the input coupler's load termination of a balanced amplifier in a beam-steering system. The noise generated in this load termination deteriorates the amplifier noise resistance, which increases the noise temperature due to a varying active reflection coefficient at the antenna ports as a function of scan angle. In reducing this effect, the balanced configuration is made more favorable for radio astronomy applications. By lowering the value of the impedance termination on the fourth port of the quadrature coupler an improvement in noise temperature sensitivity is achieved at the cost of reduced power matching.

Keywords

Low-noise and communication receiversModellingSimulation and characterizations of devices and circuits
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 5 , Issue 5 , October 2013 , pp. 561 - 565
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2013 

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References

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