Accession Number : AD0804824

Title :   MEASUREMENT TECHNIQUES FOR COMPLEX PERMEABILITY AND PERMITTIVITY OF HIGHLY CONDUCTIVE MATERIALS AT MICROWAVE FREQUENCIES.

Descriptive Note : Final rept. 1 Jul 65-1 Aug 66,

Corporate Author : EMERSON AND CUMING CANTON MA

Personal Author(s) : Luoma, Eino J. ; Epstein, David J. ; Mason, Samuel J.

Report Date : 01 AUG 1966

Pagination or Media Count : 129

Abstract : New techniques are presented for the measurement of complex permeability and permittivity of highly conductive materials at microwave frequencies. The techniques are also applicable to low-loss and non-magnetic materials. Experiences are reported with ten methods: (1) free-space reflectometer, (2) free-space Michelson interferometer, (3) Fabry-Perot variation of free-space Michelson interferometer, (4) Mason's double-incidence technique for short- and open-circuit in waveguide, (5) Mason's double-incidence technique for single interface in waveguide, (6) Mason's double-incidence technique combined with transmission measurement in waveguide, (7) half thickness reflection with full thickness transmission in waveguide, (8) half and full thickness transmission in waveguide and free space, (9) short circuit-open circuit waveguide dielectrometer (an accepted older waveguide method used for comparison), (10) transmission in free space (an older free-space method for comparison). All measurements were made at X-band on a standard set of twelve specimens covering a wide range of dielectric properties. It is concluded that the free-space Michelson interferometer and the half and full thickness transmission-coefficient measurement in either waveguide or free space offer the best improvements over the older short circuit-open circuit transmission line technique. Data reduction procedures are presented for these best methods. (Author)

Descriptors :   (*ELECTRICAL CONDUCTIVITY, PERMEABILITY), (*MICROWAVE FREQUENCY, MEASUREMENT), REFLECTOMETERS, INTERFEROMETERS, X BAND, DIELECTRIC PROPERTIES, MICROWAVES, MEASUREMENT, WAVEGUIDES, RADAR, ABSORPTION, FERROMAGNETIC MATERIALS, MAGNETIC PROPERTIES, EXPERIMENTAL DATA, DIELECTRIC PROPERTIES.

Subject Categories : Electricity and Magnetism
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE