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Propagation characteristics of transmission‐line transformers with different impedance variation patterns on substrates with very high dielectric constant
Author(s) -
Carvalho M. C. R.,
Conrado L. F. M.,
Demenicis L. S.,
Seixas D. L. A.
Publication year - 2003
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/mop.10859
Subject(s) - dielectric , transmission line , microwave , characteristic impedance , electrical impedance , transformer , quarter wave impedance transformer , propagation constant , materials science , electrical engineering , acoustics , electronic engineering , engineering , impedance matching , optoelectronics , physics , telecommunications , voltage , damping factor
Transmission‐line transformers with different impedance variation patterns and printed on substrates with very high dielectric constant (ε r = 80) are compared and the influence of the total length is studied. The propagation characteristics of the tapered lines were investigated using the finite‐element method. Dispersion effects and impedance variation with respect to the frequency have been taken into account in the analysis. The obtained results are in good agreement with theoretical predictions for ideal tapers, especially at low frequencies. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 37: 174–177, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.10859