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Fractal‐shaped stepped‐impedance transformers for wideband application
Author(s) -
Chen WenLing,
Wang GuangMing,
Qi YiNa,
Liang JianGang
Publication year - 2007
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.22557
Subject(s) - wideband , fractal , transformer , sierpinski triangle , electrical impedance , microwave , acoustics , engineering , electrical engineering , electronic engineering , physics , telecommunications , mathematics , mathematical analysis , voltage
Microstrip stepped‐impedance transformers using a Sierpinski fractal shape are proposed for the first time. The proposed fractal‐shaped stepped‐impedance transformers can greatly enhance the operating frequency bandwidth. Bandwidth up to 44.0% and 73.9% ( S 11 ≤−30 dB) have been achieved by the presented two‐section and three‐section fractal‐shaped maximal flat stepped‐impedance transformers, respectively. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 1628–1630, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22557