NDLI: Estimation of dielectric constant of composite materials in buildings using reflected fields and PSO algorithm

Content Provider	IEEE Xplore Digital Library
Author	Vilovic, I. Burum, N. Nadj, R.
Copyright Year	2010
Description	Author affiliation: University of Dubrovnik, Department of Electrical Engineering and Computing, Dubrovnik, Croatia (Vilovic, I.; Burum, N.) \|\| University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, Croatia (Nadj, R.)
Abstract	This paper presents a free-space measurement technique for estimating the complex dielectric constant and loss tangent of the walls in given building. To determine propagation characteristics in buildings for wireless indoor communications, it is necessary to obtain the reflection and transmission properties of the building structures. The measurement of walls parameters need to be measured for each particular building. The free-space technique doesn't need material samples and measurement can be made in specific building space. The single layered and multilayered models are included in presented models. The both polarizations are included. The main parts of the proposed measurement setup consist of Vector Network Analyzer (VNA) and two horn antennas. The measurement has been made in the existing building on non-destructive manner. The estimation of the complex dielectric constant from reflection and transmission coefficients is basically an optimization process because it is necessary to obtain good curve fitting between measured and calculated reflection coefficients for different angles of incidence for given material. In this particular case two methods are compared non-linear least squares method and Particle Swarm Optimization (PSO) method. The results obtained by PSO method show lower values of mean square error then with non-linear least squares method.
Starting Page	1
Ending Page	5
File Size	406639
Page Count	5
File Format	PDF
ISBN	9781424464319
e-ISBN	9788476534724
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-04-12
Publisher Place	Spain
Access Restriction	Subscribed
Rights Holder	EurAAP
Subject Keyword	Antenna measurements Dielectric constant Composite materials Buildings Dielectric measurements Measurement techniques Dielectric loss measurement Particle measurements Reflection Least squares methods
Content Type	Text
Resource Type	Article

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