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J Electromagn Eng Sci > Volume 14(4); 2014 > Article
Journal of Electromagnetic Engineering and Science 2014;14(4):387-392.
DOI: https://doi.org/10.5515/JKIEES.2014.14.4.387   
Size and Harmonic Reduced Wilkinson Balun Using Parallel Coupled Line with Open Stub
Won-Kyun Lee1, Hee-Yong Hwang2
1Department of Electrical and Electronic Engineering, Kangwon National University
2Department of Electrical and Electronic Engineering and BK21 Plus Graduate Program, Kangwon National University
Abstract
In this paper, a size-reduced Wilkinson balun with wide harmonic-suppressed band is presented. An accurate analysis of the parallel coupled line with an open stub (PCL-OS) is carried out. The PCL-OS structure shows excellent low pass filter and harmonic-suppression characteristics, which is useful for designing a low pass filter unit cell (LUC) with a reduced size. The designed Wilkinson balun at a 2.45 GHz center frequency not only shows an excellent harmonic suppression including the 5th harmonics up to 14 GHz over 15 dB, but it also has an area reduced to 48% of the conventional one.
Key words: Harmonic Suppression, Low Pass Filter Unit Cell (LUC), Parallel Coupled Line with an Open Stub (PCL-OS), Wilkinson Size Reduction, Balun
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