Interactive computer programs for the computer aided design of linear microwave circuits

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

Index to NASA Tech Briefs, 1975

This index contains abstracts and four indexes--subject, personal author, originating Center, and Tech Brief number--for 1975 Tech Briefs

Symbolic analysis tools-the state of the art

This paper reviews the main last generation symbolic analyzers, comparing them in terms of functionality, pointing out also their shortcomings. The state of the art in this field is also studied, pointing out directions for future research

NASA scientific and technical publications: A catalog of special publications, reference publications, conference publications, and technical papers, 1989

This catalog lists 190 citations of all NASA Special Publications, NASA Reference Publications, NASA Conference Publications, and NASA Technical Papers that were entered into the NASA scientific and technical information database during accession year 1989. The entries are grouped by subject category. Indexes of subject terms, personal authors, and NASA report numbers are provided

JPL bibliography 39-12 - Prerelease for December 1970

Bibliography of technical reports on scientific and engineering studies, December 197

Index to 1984 NASA Tech Briefs, volume 9, numbers 1-4

Short announcements of new technology derived from the R&D activities of NASA are presented. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage commercial application. This index for 1984 Tech B Briefs contains abstracts and four indexes: subject, personal author, originating center, and Tech Brief Number. The following areas are covered: electronic components and circuits, electronic systems, physical sciences, materials, life sciences, mechanics, machinery, fabrication technology, and mathematics and information sciences

Application of advanced technology to space automation

Automated operations in space provide the key to optimized mission design and data acquisition at minimum cost for the future. The results of this study strongly accentuate this statement and should provide further incentive for immediate development of specific automtion technology as defined herein. Essential automation technology requirements were identified for future programs. The study was undertaken to address the future role of automation in the space program, the potential benefits to be derived, and the technology efforts that should be directed toward obtaining these benefits

The NASA SBIR product catalog

The purpose of this catalog is to assist small business firms in making the community aware of products emerging from their efforts in the Small Business Innovation Research (SBIR) program. It contains descriptions of some products that have advanced into Phase 3 and others that are identified as prospective products. Both lists of products in this catalog are based on information supplied by NASA SBIR contractors in responding to an invitation to be represented in this document. Generally, all products suggested by the small firms were included in order to meet the goals of information exchange for SBIR results. Of the 444 SBIR contractors NASA queried, 137 provided information on 219 products. The catalog presents the product information in the technology areas listed in the table of contents. Within each area, the products are listed in alphabetical order by product name and are given identifying numbers. Also included is an alphabetical listing of the companies that have products described. This listing cross-references the product list and provides information on the business activity of each firm. In addition, there are three indexes: one a list of firms by states, one that lists the products according to NASA Centers that managed the SBIR projects, and one that lists the products by the relevant Technical Topics utilized in NASA's annual program solicitation under which each SBIR project was selected

Index to 1981 NASA Tech Briefs, volume 6, numbers 1-4

Short announcements of new technology derived from the R&D activities of NASA are presented. These briefs emphasize information considered likely to be transferrable across industrial, regional, or disciplinary lines and are issued to encourage commercial application. This index for 1981 Tech Briefs contains abstracts and four indexes: subject, personal author, originating center, and Tech Brief Number. The following areas are covered: electronic components and circuits, electronic systems, physical sciences, materials, life sciences, mechanics, machinery, fabrication technology, and mathematics and information sciences

The 30/20 GHz fixed communications systems service demand assessment. Volume 2: Main report

A forecast of demand for telecommunications services through the year 2000 is presented with particular reference to demand for satellite communications. Estimates of demand are provided for voice, video, and data services and for various subcategories of these services. The results are converted to a common digital measure in terms of terabits per year and aggregated to obtain total demand projections