Neural Networks for RF and Microwave Design
An electrical engineering textbook on practical applications of artificial intelligence technology methods to solving complex radio-frequency and microwave design problems.
TABLE OF CONTENTS Neural Networks for RF and Microwave Design
Chapter 2: Modeling and Optimization for Design
This chapter discusses the anatomy of the overall design process. Conventional design and computer-aided design methodologies are presented. Concepts of knowledge-aided design are introduced. Current status of CAD techniques for RF and microwave circuits and printed antennas is reviewed. The importance of modeling and optimization in the design process is brought out. It is in these two areas that ANNs are likely to play very crucial roles. The anticipated role of neural network techniques in knowledge-aided design is pointed out.
2.1 The Design Process
2.1.1 Anatomy of the Design Process
The sequence of various steps in a typical RF and microwave design process (actually for any design!) [1] is shown in Figure 2.1. One starts with problem identification. This phase is concerned with determining the need for a product. A product is identified, resources allocated, and end-users are targeted. The next step is drawing up the product design specification (PDS), which describes the requirements and performance specifications of the product. This is followed by a concept generation stage, where preliminary design decisions are made. Several alternatives will normally be considered. Decisions made at this stage determine the general configuration of the product and thus have enormous implications for the remainder of the design process. At each of these design stages, there is usually a need for feedback to earlier stages and reworking of the previous steps. The analysis and evaluation of the conceptual design lead to conceptrefinement, for example, by placing values on numerical attributes.The performance of the conceptual design...
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