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An improved method for the wave propagation constant γ estimation in broadband uniform millimeter‐wave transmission line
Author(s) -
ReynosoHernández J. A.,
EstradaMaldonado C. Fabiola,
Parra T.,
Grenier K.,
Graffeuil J.
Publication year - 1999
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/(sici)1098-2760(19990820)22:4<268::aid-mop16>3.0.co;2-6
Subject(s) - attenuation , propagation constant , characteristic impedance , transmission line , microwave , constant (computer programming) , extremely high frequency , dispersion (optics) , optics , scattering parameters , cascade , matrix (chemical analysis) , line (geometry) , dielectric , transmission (telecommunications) , physics , wave impedance , computational physics , electrical impedance , materials science , mathematics , telecommunications , engineering , optoelectronics , computer science , geometry , quantum mechanics , programming language , chemical engineering , composite material
A new method is derived for computing the wave propagation constant γ of a uniform transmission line. The new method is based on the properties of a similar and unitary matrix, and allows us to minimize the errors due to connection repeatability. These matrices are obtained from the wave cascade matrices (computed from scattering parameter measurements) of two different length lines of identical but unknown characteristic impedance. The usefulness of the new method is demonstrated by assessing the dispersion of the dielectric constant ε eff and the attenuation constant α of an ultra‐low‐loss transmission line in the frequency range of 0.040–65 GHz. ©1999 John Wiley & Sons, Inc. Microwave Opt Technol Lett 22: 268–271, 1999.