A 60 GHz branch line coupler fabricated using integrated rectangular coaxial lines

@article{Reid2004A6G,
  title={A 60 GHz branch line coupler fabricated using integrated rectangular coaxial lines},
  author={J. Robert Reid and R. T. Webster},
  journal={2004 IEEE MTT-S International Microwave Symposium Digest (IEEE Cat. No.04CH37535)},
  year={2004},
  volume={2},
  pages={441-444 Vol.2}
}
A 60 GHz branch line coupler is fabricated using rectangular coaxial transmission lines. The coupler was built using a new microfabrication process. To the authors' knowledge, this is the first V-Band demonstration of devices fabricated in this manner. The coupler has a measured insertion loss of 3.4-4.1 dB over the 57-63 GHz frequency range. The device was fabricated successfully in a single design pass. A comparison between the design simulations and the measured results are presented. 
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