A Method for Direct Impedance Measurement in Microwave and Millimeter-Wave Bands

Author

Randus, Martin ; Hoffmann, Karel

Author_Institution

Fac. of Electr. Eng., Czech Tech. Univ. in Prague, Prague, Czech Republic

Volume

59

Issue

8

fYear

2011

Firstpage

2123

Lastpage

2130

Abstract

A novel method for direct impedance measurement using a common vector network analyzer (VNA) is introduced and experimentally verified. In commonly used methods, the input impedance or admittance of a device-under-test (DUT) is derived from the measured value of its reflection coefficient causing serious inaccuracy problems for very high and very low impedances. The proposed method makes it possible to measure a quantity that is, in the ideal case, directly proportional to the value of input impedance or admittance of the DUT, enabling accurate and stable measurement of impedances that are extremely different from the common 50-Ω reference impedance. The method can significantly reduce errors caused by the VNA.

Keywords

electric impedance measurement; microwave measurement; millimetre wave measurement; network analysers; device-under-test; direct impedance measurement; microwave bands; millimeter-wave bands; reflection coefficient; vector network analyzer; Calibration; Connectors; Frequency measurement; Gain; Impedance; Impedance measurement; Standards; Calibration; impedance measurement; microwave circuits; microwave measurements; nanotechnology;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/TMTT.2011.2141148

Filename

5771082