Accession Number : AD0600465

Title :   SURFACE-WAVE PROPAGATION ALONG A FERRITE ROD.

Descriptive Note : Scientific rept. no. 3 (Series 3)

Corporate Author : HARVARD UNIV CAMBRIDGE MASS CRUFT LAB

Personal Author(s) : Tao,T. F.

Report Date : 20 MAR 1963

Pagination or Media Count : 155

Abstract : Three characteristics of the surface-wave mode are measured. The first is its guided wavelength (its phase velocity). The second is its attenuation in the direction of propagation. The third is the radial field distribution. The development of microwave ferrites is briefly reviewed. The state of the art and unsolved problems are presented. The experimental setup and its design are discussed. It consists of two parts. The first is concerned with the dc magnetic field; it includes the dc magnetic circuit, its magnetic supply and the field measuring instruments. The second is the microwave part which includes the surfacewave cavity, its microwave excitation circuits and the associated measuring equipment. The methods of measuring the three characteristics referred to above are first discussed separately. Next, the behavior of the surfacewave resonances are explained. Finally, this information is coordinated to provide an integrated picture of the procedure of measurement. The measured results are presented. These include the dc magnetic measurements, the measurements of the guided wavelength which are satisfactory and can be interpreted without ambiguities, the measurement of attenuation and of the radial field result. A theoretical calculation is made to check the measured guided wavelength. The whole study is reviewed. The significance of its success is evaluated. The possible ambiguities and false interpretations are pointed out. Finally, suggestions are listed for further continued research. (Author)

Descriptors :   (*WAVEGUIDES), (*FERRITES, WAVE PROPAGATION), (*PROPAGATION, MICROWAVES), FERROMAGNETISM, MAGNETIC RESONANCE, CIRCUITS, MAGNETIC FIELDS, INTENSITY, CALIBRATION, MEASUREMENT

Distribution Statement : APPROVED FOR PUBLIC RELEASE