Microwave Filters for Communication Systems: Fundamentals, Design and Applications

PREFACE

The book begins with a simple model of a communication system. It addresses the issues: (1) whether there is a limitation on the available bandwidth for a wireless communication system, (2) what are the limitations for transmitting information in the available bandwidth, and (3) what are the cost sensitive parameters of a communication system? Each issue is then addressed to gain understanding of various system parameters with emphasis on the role and requirements of filter networks in different parts of the communication system. This sets the stage to address the fundamentals of filter design based on circuit theory approximation. It continues with a description of classical filters. This is followed by the development of computer aided techniques to generate general class of prototype filter functions, exhibiting symmetrical or asymmetrical frequency response. This general formulation is accomplished by incorporating hypothetical frequency invariant reactive (FIR) elements in the lowpass prototype filter design. The FIR elements show up as frequency offsets of resonant circuits in real bandpass or bandstop filters. Absence of FIR elements represents the classical filter function that gives rise to symmetrical frequency response. From this general formulation of the filter function, synthesis techniques are described to realize the equivalent lumped parameter circuit model of filter networks. Next step in the synthesis procedure is to translate the circuit model of the ...