A radial transmission line material measurement apparatus

Technical Report · Sat May 01 04:00:00 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 Labs., 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
• Country of Publication: United States
• Language: English

Related Subjects

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