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This book mainly comprises studies of convoluted array elements derived from dipoles, cross dipoles and strips, supported by theoretical predictions and experimental results. Designs and design procedures of single and multilayer Frequency Selective Surfaces (FSS or dichroics), with applications in the millimetre wave band, are also described here. Numerical programs based on the well known modal analysis approach were mainly used to provide most of the theoretical results. An extension of the Fabry-Perot Interferometer concept is introduced to help the analysis of multilayer FSS.

Genetic Algorithm and Artificial Neural Networks have been combined to solve several problems in last two decades. The first one have been used to help find parameters and topology decision of the second one, or to cope with learning algorithm limitations. Some problems demand the application of neural networks as alternative solution to solve them, but studies that develop a methodology to indicate the best neural architecture suitable for a specific application is rare to be found in the literature. In this work we apply genetic algorithm to search for neural weights and use this...