Accession Number : ADA189343

Title :   Studies of MSFVW (Magnetostatic Forward Volume Wave) to MSBVW (Magnetostatic Backward Volume Wave) Mode Conversion at a Region of Bias-Field Discontinuity and of the Dispersion of an MSFVW Pulse.

Descriptive Note : Final rept. Aug 82-May 87,

Corporate Author : STATE UNIV OF NEW YORK AT STONY BROOK DEPT OF ELECTRICAL ENGINEERING

Personal Author(s) : Parekh, J P ; Tuan, H S

PDF Url : ADA189343

Report Date : Dec 1987

Pagination or Media Count : 82

Abstract : This report investigates mode conversion from magnetostatic forward volume waves (MSFVW's) to magnetostatic backward volume waves (MSBVW's) through a region of bias-field discontinuity, and the prospects of monolithically implementing a nondispersive delay line on a given YIG-film strip by changing the magnitude and direction of the internal bias field within the delay line between the two microstrip transducers so that a portion of the delay would support MSFVW and the remainder of the delay line would support MSBVW. This configuration constitutes a monolithic implementation of a discrete forward wave-type delay line cascaded to a discrete backward wave-type delay line, with the requisite dispersion self-compensation achieved by matching the delay characteristics of the two delay lines. The principle objective was to establish if efficient mode conversion is possible over a wide bandwidth. The problem was attacked by performing theoretical and experimental studies simultaneously. The experimental study indicated that the presence of mode conversion only over a very narrow band. Initial theoretical results for mode conversion across a single boundary separating two regions with fixed bias-field angles were encouraging in that they showed that, for a small change of tilt angle across the boundary, efficient mode conversion is possible over a wide band.

Descriptors :   *DELAY LINES, *ELECTROMAGNETIC WAVE REFLECTIONS, *MAGNETOSTATICS, *STRIP TRANSMISSION LINES, ANGLES, BIAS, BOUNDARIES, BROADBAND, CONVERSION, DELAY, EFFICIENCY, EXPERIMENTAL DATA, FORWARD AREAS, INTERNAL, NARROWBAND, THEORY, TILT, TRANSDUCERS, VOLUME, WAVES

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE