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Export Reference (APA) 
Silveirinha, M. G., Fernandes, C. A. & Costa, J. R. (2014). A graphical aid for the complex permittivity measurement at microwave and millimeter wavelengths. IEEE Microwave and Wireless Components Letters. 24 (6), 421-423
Export Reference (IEEE) 
M. G. Silveirinha et al.,  "A graphical aid for the complex permittivity measurement at microwave and millimeter wavelengths", in IEEE Microwave and Wireless Components Letters, vol. 24, no. 6, pp. 421-423, 2014
Export BibTeX 
@article{silveirinha2014_1766417434985,
	author = "Silveirinha, M. G. and Fernandes, C. A. and Costa, J. R.",
	title = "A graphical aid for the complex permittivity measurement at microwave and millimeter wavelengths",
	journal = "IEEE Microwave and Wireless Components Letters",
	year = "2014",
	volume = "24",
	number = "6",
	doi = "10.1109/LMWC.2014.2310470",
	pages = "421-423",
	url = "http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6777586&sortType%3Ddesc_p_Publication_Year%26queryText%3D.QT.Costa+J.QT.1"
}
Export RIS 
TY  - JOUR
TI  - A graphical aid for the complex permittivity measurement at microwave and millimeter wavelengths
T2  - IEEE Microwave and Wireless Components Letters
VL  - 24
IS  - 6
AU  - Silveirinha, M. G.
AU  - Fernandes, C. A.
AU  - Costa, J. R.
PY  - 2014
SP  - 421-423
SN  - 1531-1309
DO  - 10.1109/LMWC.2014.2310470
UR  - http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6777586&sortType%3Ddesc_p_Publication_Year%26queryText%3D.QT.Costa+J.QT.1
AB  - We introduce a novel procedure to retrieve the complex permittivity ?'-j?'' of dielectric materials. It is a variant of the well-known waveguide method, and uses as input the one-port reflection data from a vector network analyzer connected to a short-circuited rectangular waveguide filled with a dielectric sample of known length. Here, it is shown that for low to moderate loss materials, the locus of the reflection coefficient in the complex plane versus frequency is approximately a circumference arc with curvature radius that depends mainly on ?'' and such that the swept angle depends mostly on ?'. It is proven that fitting the theoretical circumference arc with the measured data not only allows identifying possible measurement errors but also enables estimating the complex permittivity with good accuracy. A graphical based implementation of the method is described and validated experimentally.
ER  -