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Distorted beam pattern in array antenna is due to failure of one are more elements in array. Correction in beam pattern is done either through readjusting the weights of remaining healthy array elements or by readjusting phase. Readjusting phase put restriction beam steering which is unacceptable. We can easily correct faulty array pattern without paying much cost by readjustment of weights by different optimization techniques. In this work a new optimization hybrid technique based on firefly & harmony search algorithm in LAA. This optimization algorithm has provided fast and more accurate...

This book shows how to construct a sound level meter and interface it with computer by using the micro controller. This could be used in wide range of application by calibrating it with standard meter. The main feature of sound level meter is the flexibility due to user define threshold value and this will also show graphical representation of sound level and the main challenges in its construction was that it follow A frequency response, easy to install and be inexpensive.