Design of dual-band branch line couplers with circuit miniaturization

@article{Hsu2008DesignOD,
  title={Design of dual-band branch line couplers with circuit miniaturization},
  author={Ching-Luh Hsu and J R Kuo},
  journal={2008 Asia-Pacific Microwave Conference},
  year={2008},
  pages={1-4}
}
Design of a dual-band branch line coupler with a very compact size is proposed. For reducing circuit area, stepped-impedance sections are used. Folded open stubs are attached to each stepped-impedance section at its both ends for the dual-band purpose. Circuit dimensions and geometrics are designed in order to achieve the best circuit miniaturization. For validation, measured results of an experimental circuit are compared with simulation data. 

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