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Unequal termination branch‐line balun with high‐isolation wideband characteristics
Author(s) -
Kim Phirun,
Chaudhary Girdhari,
Jeong Yongchae
Publication year - 2016
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.29914
Subject(s) - balun , wideband , bandwidth (computing) , center frequency , return loss , electrical engineering , microwave , physics , engineering , electronic engineering , telecommunications , antenna (radio) , band pass filter
This article presents a design of an unequal termination impedance branch‐line balun with wideband high isolation. The wideband and high isolation characteristics are obtained only in the under‐matched region. For an experimental verification, the proposed balun was designed at a center frequency ( f 0 ) of 2.6 GHz. The measured results are in good agreement with the simulations. From the measurement, the power divisions are −3.29 dB and −3.3 dB. The return loss at f 0 is 22.3 dB and is higher than 20 dB over a bandwidth of 0.51 GHz. The isolation between output ports is higher than 19 dB for the bandwidth of 0.64 GHz. The phase imbalance between two output ports is 180° ± 5° for the bandwidth of 0.64 GHz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:1775–1778, 2016