NDLI: Calculation of the impedance of a rectangular waveguide aperture in the presence of a loaded dipole antenna embedded in a generally lossy material

Content Provider	IEEE Xplore Digital Library
Author	Hughes, D. Zoughi, R.
Copyright Year	2003
Description	Author affiliation: Dept. of Electr. & Comput. Eng., Missouri Univ., Rolla, MO, USA (Hughes, D.; Zoughi, R.)
Abstract	The use of a combined embedded modulated scattering technique, utilizing a PIN diode-loaded dipole probe, and near-field microwave nondestructive testing technique, utilizing an open-ended rectangular waveguide, has been investigated as a means for determining the complex dielectric constant in which the MST probe is embedded. For this, the formulation of the forward problem of calculating the modulated reflection coefficient, measured at the aperture of the waveguide, is presented here. This formulation is based upon the reciprocity theorem for two antennae, and utilizes the near-field radiation pattern of a rectangular waveguide aperture and current distribution along the length of a dipole antenna. This formulation is verified with measured values as a function of location, load impedance and surrounding media. Finally, potential improvements, considerations, and the use of an inversion routine are discussed.
Sponsorship	IEEE Instrum. & Meas. Soc
Starting Page	1126
Ending Page	1130
File Size	376035
Page Count	5
File Format	PDF
ISBN	0780377052
ISSN	10915281
DOI	10.1109/IMTC.2003.1207929
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-05-20
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Impedance Rectangular waveguides Aperture antennas Dipole antennas Loaded antennas Probes Antenna measurements Antenna theory Dielectric materials Scattering
Content Type	Text
Resource Type	Article
Subject	Instrumentation Electrical and Electronic Engineering

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