Principles of Microwave Circuits is an unabridged reprint of the book
first published in 1948 by McGraw Hill as Volume 8 of the MIT Radiation
Laboratory Series. Since the original publication of this book, a number
of errors have been brought to our attention. Corrections of these
errors are incorporated in this edition.
In the engineering application of low-frequency currents, an important
step forward was the development of the impedance concept and its
utilization through the theory of linear networks. It was almost
inevitable that this concept would be generalized and become useful in
the application of microwaves. This volume is devoted to an exposition
of the impedance concept and to the equivalent circuits of microwave
devices. It is the intention to emphasise the underlying principles of
these equivalent circuits and the results that may be obtained by their
use. Specific devices are not discussed except as illustrations of the
general methods under consideration. The results of such calculations
that had been performed up to that time are compiled in Vol. 21 of the
Electromagnetic Waves Series, the Waveguide Handbook edited by N.
Marcuvitz, and these results are used freely. Although the work of the
Radiation Laboratory at MIT was the development of military radar
equipment, the principles discussed in this volume can be applied to
microwave equipment of all kinds.