Transmission Networks and Wave Filters #270258

The material in this text was originally organized for presentation in one of those "out-of-hour courses" in Bell Telephone Laboratories through which its members make more widely available to each other, their specialized technical information. Since then the material has undergone revision for subsequent presentations in that series of courses and also for presentation at Massachusetts Institute of Technology by invitation of its Electrical Engineering Department.<br><br>Wave filters and transmission networks for a large variety of purposes, are widely used in the telephone plant of the Bell System, and the present material was prepared in the atmosphere of a laboratory, concerned with the development and design of such equipment. The text should, therefore, not be regarded as original in its subject matter but rather as synthesizing contributions of a large number of scientists, largely within the Bell System.<br><br>In the development of wave-filters, contributors to the formation of a comprehensive theoretical treatment have been G. A. Campbell, O. J. Zobel, and K. S. Johnson in this country; and in Europe, K. W. Wagner. In the development of the fundamental theory underlying transmission networks, O. B. Blackwell, G. A. Campbell and A. E. Kennelly are among the more important contributors. To the original work of these men the author acknowledges his indebtedness; and in connection with the analysis of transient waves by Fourier integral methods to the work of G. A. Campbell, H. Nyquist, and R. V. L. Hartley.<br><br>The author also desires to express his appreciation to Carl L. Frederick and C. H. Dagnall, members of the technical staff of Bell Telephone Laboratories, who have very largely carried out the final editing in preparation for publication.