Accession Number : AD0734967

Title :   Periodic and Log Periodic Coupling of Modes of Propagation.

Descriptive Note : Technical rept.,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Knorr,Jeffrey B.

Report Date : AUG 1971

Pagination or Media Count : 30

Abstract : 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)

Descriptors :   (*WAVEGUIDE COUPLERS, TRANSMISSION LINES), MICROWAVE EQUIPMENT, PROPAGATION, PHASE SHIFT, INTERACTIONS, THESES

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE