Compact unfocused antenna setup for X-band free-space dielectric measurements based on line-network-network calibration method

authored by: Christian Orlob, Tobias Reinecke, Eckhard Denicke, Bernd Geck, Ilona Rolfes
Abstract: This paper presents a compact free-space measurement system for the characterization of dielectric materials within the X-band based on the line-network-network (LNN) calibration method. Using a pair of dielectric-filled horn antennas with enhanced directivity, the setup exhibits a total length of 250 mm between the antenna apertures and is suitable for measurements of planar samples with transverse dimensions equal to or greater than 250 mm × 250 mm. Based on 3-D field simulations and measurements, the assumptions of plane wave incidence on the sample and negligible diffraction effects at the sample edges are investigated. The scattering parameters of the sample are obtained according to the LNN calibration method. Remaining multipath propagation effects caused by reflections at the antennas and their fixtures are filtered out via time gating. The complex permittivity is finally calculated from the transmission scattering parameter using the Newton-Raphson method. Results for exemplary dielectrics are in good accordance with reference values.
Organisation(s): Institute of Electrical Engineering and Measurement Technology
Institute of Microwave and Wireless Systems
External Organisation(s): Ruhr-Universität Bochum
Type: Article
Journal: IEEE Transactions on Instrumentation and Measurement
Volume: 62
Pages: 1982-1989
No. of pages: 8
ISSN: 0018-9456
Publication date: 07.2013
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Instrumentation, Electrical and Electronic Engineering
Electronic version(s): https://doi.org/10.1109/TIM.2013.2246905 (Access: Closed)
: Details in the research portal "Research@Leibniz University"

BibTeX

@article{db491fd1ef444b52bffd732b2800fae8,
title = "Compact unfocused antenna setup for X-band free-space dielectric measurements based on line-network-network calibration method",
abstract = "This paper presents a compact free-space measurement system for the characterization of dielectric materials within the X-band based on the line-network-network (LNN) calibration method. Using a pair of dielectric-filled horn antennas with enhanced directivity, the setup exhibits a total length of 250 mm between the antenna apertures and is suitable for measurements of planar samples with transverse dimensions equal to or greater than 250 mm × 250 mm. Based on 3-D field simulations and measurements, the assumptions of plane wave incidence on the sample and negligible diffraction effects at the sample edges are investigated. The scattering parameters of the sample are obtained according to the LNN calibration method. Remaining multipath propagation effects caused by reflections at the antennas and their fixtures are filtered out via time gating. The complex permittivity is finally calculated from the transmission scattering parameter using the Newton-Raphson method. Results for exemplary dielectrics are in good accordance with reference values.",
keywords = "Antennas, free-space measurement, line-network-network (LNN) calibration method, permittivity measurement, time gating",
author = "Christian Orlob and Tobias Reinecke and Eckhard Denicke and Bernd Geck and Ilona Rolfes",
year = "2013",
month = jul,
doi = "10.1109/TIM.2013.2246905",
language = "English",
volume = "62",
pages = "1982--1989",
journal = "IEEE Transactions on Instrumentation and Measurement",
issn = "0018-9456",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
number = "7",
}