A New Planar Artificial Transmission Line and Its Applications to a Miniaturized Butler Matrix

@article{Wang2007ANP,
  title={A New Planar Artificial Transmission Line and Its Applications to a Miniaturized Butler Matrix},
  author={Chao-Wei Wang and Tzyh-Ghuang Ma and Chang-Fa Yang},
  journal={IEEE Transactions on Microwave Theory and Techniques},
  year={2007},
  volume={55},
  pages={2792-2801}
}
A miniaturized quadrature hybrid coupler, a rat-race coupler, and a 4 times 4 Butler matrix based on a newly proposed planar artificial transmission line are presented in this paper for application in ultra-high-frequency (UHF) radio-frequency identification (RFID) systems. This planar artificial transmission line is composed of microstrip quasi-lumped elements and their discontinuities and is capable of synthesizing microstrip lines with various characteristic impedances and electrical lengths… CONTINUE READING
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