Over the last several decades, modern filter theory has beensignificantly embellished by many contributors. In Zverev\'s [l]words “This search for useful theories has led to some of themost elegant mathematics to be found in the practical arts.”Excitement over this elegance is tainted by sophistication moresuited for the filter mathematician than the engineer whose work is often less specialized. This book is directed to theengineer and not the mathematician. We do so in full reverenceof the mathematicians who provided the tools to work with inthe trenches.For completeness, a review of which predates WW II.more recent and some is of classic material is included, someOf course most of the material is 1original. It is at times a strangemixture, but always directed at the practical application of the art to today\'s real-world problems.Chapters 1 through 5 cover fundamental concepts. Althoughthis book emphasizes microwave filters, the first few chapterscover lumped element concepts more heavily than distributedelements. This is for two reasons. First, even at several gigahertz, lumped elements are useful when size is important,when stopband performance is critical and for MMIC processes.Second, much of the lumped element theory, with suitablemodification, is applicable to distributed filter development.Many engineers now at the peak of their careers began with slide rules. Less than one floating point multiply per second is performed to about three digits of precision using a slide rule.
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