Folded Half Mode Substrate Integrated Waveguide 3 dB Coupler

@article{Zhai2008FoldedHM,
  title={Folded Half Mode Substrate Integrated Waveguide 3 dB Coupler},
  author={Guo Hua Zhai and Wei Hong and Ke Wu and Ji Chen and Peng Chen and Jing Wei and Hong Tang},
  journal={IEEE Microwave and Wireless Components Letters},
  year={2008},
  volume={18},
  pages={512-514}
}
In this letter, novel compact 3 dB double-slot and single-slot couplers are proposed and implemented based on folded half mode substrate integrated waveguide (FHMSIW). The size of the FHMSIW coupler is reduced by nearly 50% and 75% compared with half-mode substrate integrated waveguide coupler and substrate integrated waveguide coupler, respectively. Prototype couplers at X-band are fabricated and measured and good performance in bandwidth, insertion loss, and balance are achieved. 

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