Abstract
ABSTRACTThis 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 (f0) 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
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