Measurements of the characteristic impedance of coaxial air line standards

Author

Juroshek, John R. ; Free, George M.

Author_Institution

Nat. Inst. of Stand. & Technol., Boulder, CO, USA

Volume

42

Issue

2

fYear

1994

fDate

2/1/1994 12:00:00 AM

Firstpage

186

Lastpage

191

Abstract

A method for electrically measuring the characteristic impedance of coaxial air line standards is described. This method, called the gamma method, determines the characteristic impedance of a coaxial air line from measurements of its propagation constant and capacitance per unit length. The propagation constant is measured on a network analyzer, and the capacitance per unit length is measured on a capacitance bridge at 1 kHz. The measurements of characteristic impedance with the gamma method are independent of any dimensional measurements. Measurements of the characteristic impedance using the gamma method are compared to theoretical predictions from dimensional measurements. Test results are shown for 14 mm, 7 mm, and 3.5 mm coaxial air lines

Keywords

calibration; capacitance measurement; electric impedance measurement; measurement standards; microwave measurement; network analysers; 3.5 to 14 mm; calibration; capacitance bridge; capacitance per unit length; characteristic impedance measurement; coaxial air line standards; gamma method; microwave network analyzer; propagation constant; Bridge circuits; Capacitance measurement; Coaxial components; Electric variables measurement; Impedance measurement; Length measurement; Measurement standards; Measurement units; Propagation constant; Testing;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.275245

Filename

275245