A radial transmission line material measurement apparatus

Technical Report · Sat May 01 00:00:00 EDT 1993

DOI:https://doi.org/10.2172/10175331· OSTI ID:10175331

Warne, L. K.; Moyer, R. D.; Koontz, T. E.; Morris, M. E.

A radial transmission line material measurement sample apparatus (sample holder, offset short standards, measurement software, and instrumentation) is described which has been proposed, analyzed, designed, constructed, and tested. The purpose of the apparatus is to obtain accurate surface impedance measurements of lossy, possibly anisotropic, samples at low and intermediate frequencies (vhf and low uhf). The samples typically take the form of sections of the material coatings on conducting objects. Such measurements thus provide the key input data for predictive numerical scattering codes. Prediction of the sample surface impedance from the coaxial input impedance measurement is carried out by two techniques. The first is an analytical model for the coaxial-to-radial transmission line junction. The second is an empirical determination of the bilinear transformation model of the junction by the measurement of three full standards. The standards take the form of three offset shorts (and an additional lossy Salisbury load), which have also been constructed. The accuracy achievable with the device appears to be near one percent.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 10175331
• Report Number(s): SAND-92-2788; ON: DE93018508; TRN: 93:002732
• Resource Relation: Other Information: PBD: May 1993
• Country of Publication: United States
• Language: English

Related Subjects

47 OTHER INSTRUMENTATION
42 ENGINEERING
36 MATERIALS SCIENCE
COATINGS
ELECTRIC IMPEDANCE
ELECTRIC MEASURING INSTRUMENTS
DESIGN
R CODES
COMPUTER PROGRAM DOCUMENTATION
ELECTRIC CONDUCTORS
SPECIFICATIONS
COAXIAL CABLES
SURFACE PROPERTIES
SAMPLE HOLDERS
ELECTRONIC EQUIPMENT
ANTENNAS
ELECTROMAGNETIC TESTING
440800
426000
360606
MISCELLANEOUS INSTRUMENTATION
COMPONENTS
ELECTRON DEVICES AND CIRCUITS
PHYSICAL PROPERTIES