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Microwave power detectors

Eghbal Behbahani, Shiva (2015)
M.Sc. thesis, University of Birmingham.

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Abstract

The basic quantities of current and voltage are difficult to measure directly at microwave frequencies; therefore power becomes a crucial parameter. Design, operation and purchase of any RF or microwave equipment and measurement of microwave signals are enhanced by knowledge of the power [l]. So it is important to have accurate power-measuring standards at all frequencies.

This thesis looks at the design of a waveguide bolometer that is suitable for a power detector. The bolometric method measures microwave power by using a resistance changing heat sensitive element that converts the power into heat and uses a bridge circuit to read out accurate resistance change, due to the absorbed power. Two heat sensing elements are modelled here; first an inductive metal post and secondly a thin film heat sensing element, both located at a specific position in a rectangular waveguide. The design parameters are determined by using analytical equations and transmission line theory. For both elements the design structure results validate the theory and show good power absorption at the center frequency of operation. The ultimate aim is to have a bolometer operating at the higher frequency bands; however in this thesis they are modelled at X-band (8.2-12.4 GHz).

Type of Work:M.Sc. thesis.
Supervisor(s):Lancaster, M.J.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Electronic, Electrical and Systems Engineering
Subjects:TK Electrical engineering. Electronics Nuclear engineering
Institution:University of Birmingham
ID Code:6261
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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