Accession Number : AD0825642

Title :   STUDY OF MICROWAVE GENERATION BY MEANS OF INTERACTION WITH ANISOTROPIC MEDIA.

Descriptive Note : Final rept. 1 Jun 65-15 Oct 67,

Corporate Author : RAYTHEON CO WALTHAM MA RESEARCH DIV

Personal Author(s) : Osepchuk, J. ; Simpson, J.

Report Date : JAN 1968

Pagination or Media Count : 126

Abstract : The objectives of this program were to discover and demonstrate useful slow-wave structures of chemically vapor deposited materials. Such structures promise the simplicity, ruggedness, and high temperature capability desired for millimeter devices. Slow-wave structures were to employ an anisotropic conducting sheet either from the anisotropic electrical conductivity of some of the materials or from layered or ruled conducting arrays. Structures tested were the Karp line and simulated interdigital and meander lines which employed the conductor sheath with periodic edge contacts. No CVD material was found with sufficiently high bulk anisotropy to provide low-loss uniform sheet structures. Thin layers of CVD zirconium diboride and boron nitride were found to have good bond strength but deposition irregularities, requiring further process development, prevented tests of microwave samples. Sheaths of ZrB2 on BN suffered from nonuniform deposits which can be corrected by the use of a larger furnace. Similar arrays of fine lines etched in copper on plastic substrates were used to demonstrate slow-wave propagation at S-band in the Karp line and the interdigital line. Theoretical analyses were performed treating wave propagation in infinite anisotropic layered media, in parallel plate waveguides containing an anisotropic sheath, in rectangular waveguides coupled through an anisotropic wall and in interdigital lines composed of an array of fine wires. The application of anisotropic conductors to admittance wall amplifiers was also analyzed. (Author)

Descriptors :   (*MICROWAVE OSCILLATORS, MATERIALS), (*MICROWAVES, PROPAGATION), ANISOTROPY, ELECTRON BEAMS, INTERACTIONS, VAPOR PLATING, MILLIMETER WAVES, MICROWAVE EQUIPMENT, SHEETS, WAVEGUIDES, ELECTRON TUBES, PYROLYTIC GRAPHITE, BORON COMPOUNDS, NITRIDES, BORIDES, ZIRCONIUM COMPOUNDS.

Subject Categories : Electrical and Electronic Equipment
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE