Soft Computing Methods for Microwave and Millimeter-Wave by Narendra Chauhan, Machavaram Kartikeyan, Ankush Mittal

By Narendra Chauhan, Machavaram Kartikeyan, Ankush Mittal

The growing to be advertisement marketplace of Microwave/ Millimeter wave during the last decade has ended in the explosion of pursuits and possibilities for the layout and improvement of microwave components.The layout of so much microwave parts calls for using commercially to be had electromagnetic (EM) simulation instruments for his or her research. within the layout procedure, the simulations are conducted by means of various the layout parameters till the specified reaction is got. The optimization of layout parameters via handbook looking is a bulky and time eating strategy. tender computing equipment resembling Genetic set of rules (GA), synthetic Neural community (ANN) and Fuzzy good judgment (FL) were ordinary through EM researchers for microwave layout in view that final decade. the purpose of those tools is to tolerate imprecision, uncertainty, and approximation to accomplish strong and occasional price resolution in a small timeframe. Modeling and optimization are crucial elements and strong instruments for the microwave/millimeter wave layout. This ebook bargains with the advance and use of sentimental computing tools for tackling tough layout difficulties within the microwave/millimeter wave area. the purpose within the improvement of those equipment is to procure the layout in small time-frame whereas enhancing the accuracy of the layout for quite a lot of functions. to accomplish this aim, a number of varied layout difficulties of microwave box, representing assorted demanding situations within the layout, comparable to varied microstrip antennas, microwave filters, a microstrip-via and in addition a few serious excessive strength elements equivalent to nonlinear tapers and RF-windows are regarded as case-study layout difficulties. various layout methodologies are built for those purposes. The offers gentle computing tools, their evaluate for microwave/millimeter wave layout difficulties and particular case-study difficulties to infuse larger perception and realizing of the subject.

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Xu and Rahmat-Samii [50] shows the use of Multi-Objective PSO (MOPSO) by applying it to two electromagnetic problems: synthesis of 16-element antenna array which is optimized for trade-off between beam efficiency and half-power beam width, and optimization of shape reflector antenna for high gains of multiple feeds. Researchers have also compared the concepts and performances of PSO with GA. The conceptual difference between PSO and GA is described by Kennedy and Eberhart [53]. According to them, PSO lie between GA and evolutionary computation.

For convenience, we have divided the discussion of the review into four parts: microwave design using genetic algorithms, microwave design using SI based algorithms such as PSO and BFO, microwave modeling using soft computing methods such as ANN and SVM, and hybridization of soft computing methods used for microwave design. The list of references covered in this review is by no means exhaustive, but it is fairly representative of present usage of these techniques. The organization of the chapter is as follows.

Boeringer and Werner [55] compared PSO and GA for phased array synthesis problem. They obtained good performance with both the methods. According to them the cost function budget for electromagnetic optimization dominates, and book-keeping requirement for both the algorithms becomes negligible. They also found a simpler implementation and reduced book-keeping appeal of PSO. Despite advantages of PSO such as faster convergence, simple approach, and reduced book-keeping over GA, it may also lead to premature convergence and local minima similar to GA.

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