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Title: Interactive computer programs for the computer aided design of linear microwave circuits
Author: Marchent, Brian Gerald
ISNI:       0000 0001 3618 7733
Awarding Body: University of Warwick
Current Institution: University of Warwick
Date of Award: 1973
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The objective of this thesis was to develop the basic techniques and computer programs for the interactive on-line computer aided design of linear microwave circuits. Initially all the possible types of microwave circuits were considered to see how they could be analysed in a computer program. The result of this was that it was found that the best way to analyse a microwave circuit was to consider the circuit to consist of an assembly of n-port networks, with the entire circuit consisting of a single n-port network. All the results of interest to the microwave engineer were described and the equations given for these. For the analysis of microwave circuits the chain matrix, nodal analysis and a new mixed matrix method of analysis were considered in detail and a comparison of the optimum method and computation time made. The result of this was that it was found that the chain matrix analysis was the fastest but of limited application whilst the new mixed matrix analysis was able to analyse any microwave circuit. The first computer programs developed by the author used the chain matrix analysis, the main one of these being the CHAIN1 program. This program advanced the use of chain matrix analysis to its limit. A path topological analysis was included in the program which broke the circuit down into an assembly of cascades of 2-port networks in the circuit. Thus it was not necessary to define the path topology precisely in the data. Later the MICRO3 program was developed by the author to use the new mixed matrix analysis for a general assembly of n-port networks. This program was found to be far more versatile and almost any microwave circuit could be handled by the method of analysis used in this program. During the development of the programs, as each new program was developed, more facilities were included for the interactive on-line use of the programs. In the MICRO3 program a list processing approach to the data structure in the program and a full syntactical analysis of the data was included. This made it possible to generate very complex data structures in the program thus making the program ideal for interactive on-line use on a computer. The data for this program was more like a programming language than normal data and any data error could be correct on-line during the run of the program. The program could be used on batch processing, on a remote teletype interactively or with a graphical display to display the results of an analysis in graphical form. An investigation into the equations describing microwave components and optimisation techniques was carried out. The MICRO3 program was prepared for these facilities but there was not sufficient time to include these facilities completely.
Supervisor: Not available Sponsor: Science Research Council ; Redac Software Ltd
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: QA76 Electronic computers. Computer science. Computer software ; TK Electrical engineering. Electronics Nuclear engineering