An extremely compact dual-band branch-line coupler

作者：Yuan Shih Yi^*; Shiau Miin Shyue; Liao Shry Sann; Sun Pou Tou; Ho Chia Tai

来源：Microwave and Optical Technology Letters, 2007, 49(12): 3011-3014.

DOI：10.1002/mop.22895

• dual-band branch-line coupler
• compact
• stepped-impedance resonator

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 at this study to achieve the criteria, including stepped-impedance resonators (SIR) structure, symmetrical T-shape structure, headed and folded 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 us useful for the modern wireless communication systems.

• 出版日期2007-12