A TUTORIAL EXPOSITION OF THE FUNDAMENTAL NETWORK-THEORETIC IDEAS UNDERLYING MODERN INSERTION-LOSS FILTER DESIGN.
POLYTECHNIC INST OF BROOKLYN N Y DEPT OF ELECTROPHYSICS
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From the outset research in Network theory has been propelled forward by the desire to build superior filters incorporating the many practical constraints in a realistic way. The early emergence of the image-parameter method of filter design was quite natural since in concept it was based squarely on a modal picture, so familiar in classical physics. However, despite its uncontested intuitive appeal the image-parameter philosophy has two rather pronounced rawbacks. First, the description of a lumped 2-port in terms of irrational functions such as image impedances, propagation constants, etcetera, instead of polynomials, is perhaps unnatural from the point of view of good pedagogy. Second, the terminations demanded by the theory are the image impedances of the filter and not the resistors which must actually be employed in practice. A great deal of effort and ingenuity is required to evaluate and equalize this mismatch effect, especially for wide-band designs. Nevertheless, it is fair to say that when the technique is applicable it works well and quickly and the treatise by Cauer must be considered definitive. Author
- Electrical and Electronic Equipment