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An extremely compact dual‐band branch‐line coupler
Author(s) -
Yuan ShihYi,
Shiau MiinShyue,
Liao ShrySann,
Sun PouTou,
Ho ChiaTai
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.22895
Subject(s) - miniaturization , rat race coupler , hybrid coupler , multi band device , microwave , microstrip , transmission line , resonator , engineering , electrical engineering , electronic engineering , electric power transmission , line (geometry) , coupling (piping) , topology (electrical circuits) , power dividers and directional couplers , telecommunications , antenna (radio) , mechanical engineering , mathematics , geometry
In this article, an extremely compact dual‐band branch‐line coupler is presented. The miniaturized design saved 74% circuit dimension comparing to the original dual‐band branch‐line coupler. Several design methods and miniaturization techniques were involved in this study to achieve the criteria, including stepped‐impedance resonators (SIR) structure, symmetrical T‐shape structure, bended and folded of transmission lines, and the coupling effect of microstrip‐lines. Good agreements between the simulated and measured results were also observed. Furthermore, no lumped elements, via‐holes, and bonding wires are necessary for this miniaturized coupler, making it very useful for the modern wireless communication systems. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 3011–3014, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22895