Periodic and log periodic coupling of modes of propagation
By: by Jeffrey B. Knorr
Contributors: Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1971
Place of publication: Monterey, California
Language: eng
Number of pages: 27
Subjects: Coupled mode theory; Microwave circuits
Description: The report summarizes an investigation of the applicability of the log periodic concept to coupled microwave transmission lines. It is shown that active coupling at a given frequency may be achieved between two lines supporting waves with different phase constants provided they are coupled periodically with a periodicity determined by the difference B(2)-B(1) at that frequency. Since B(2)-B(1) will, in general, vary with frequency, coupling over a broad frequency range requires a variable period. This may be realized by scaling the structure period, thereby giving rise to a log periodic mode coupler. This technique appears to hold promise for achieving the same wideband performance that has been attained with log periodic radiators. (Author)
Notes: Title from cover.

"August 1971"--Cover.

"NPS-52KO71081A"--Cover.

Author(s) key words: Coupled mode theory, periodic coupling, log periodic coupling.

Includes bibliographical references (p. 17)

"Approved for public release; distribution unlimited"--Cover.

Technical report; 1971.