Substrate integrated waveguide 180-degree narrow-wall directional coupler

@article{Liu2005SubstrateIW,
  title={Substrate integrated waveguide 180-degree narrow-wall directional coupler},
  author={Bing Liu and Wei Hong and Zhang Cheng Hao and Ke Wu},
  journal={2005 Asia-Pacific Microwave Conference Proceedings},
  year={2005},
  volume={1},
  pages={3 pp.-}
}
Substrate integrated waveguide (SIW) is a new type of guided wave structure which could be implemented in both microwave- and millimeter wave integrated circuits. The study combines narrow-wall directional coupler with slow wave structure in SIW technique and achieved an over 5.4% bandwidth with /spl plusmn/0.3dB power equality, -20 dB isolation and 180 degrees phase shift between the output- and coupled ports as well for a coupler of length of 0.59. Its low cost and small size make it… CONTINUE READING
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