Premium
Enhancement impedance transforming ratios of coupled line impedance transformer with wide out‐of‐band suppression characteristics
Author(s) -
Kim Phirun,
Chaudhary Girdhari,
Jeong Yongchae
Publication year - 2015
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.29144
Subject(s) - return loss , passband , center frequency , electrical impedance , microwave , transformer , bandwidth (computing) , materials science , electrical engineering , transmission line , quarter wave impedance transformer , impedance matching , physics , electronic engineering , engineering , telecommunications , voltage , damping factor , band pass filter , antenna (radio)
This article presents the design of an impedance transformer (IT) with wide out‐of‐band suppression characteristics. The wide out‐of‐band suppression characteristics can be obtained by loading several transmission zeros in the lower and upper out‐of‐bands. For experimental validation, a 50‐to‐10 Ω IT was implemented at a center frequency (f 0 ) of 2.6 GHz for the long term evolution signal. The measured results are in good agreement with the simulations, showing a return loss higher than 20 dB over a passband bandwidth of 0.35 GHz (2.35–2.7 GHz) and out‐of‐band suppression better than 18 dB from DC to 1.78 GHz and from 3.45 to 6.97 GHz. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:1600–1603, 2015