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A Photogenerated Silicon Plasma Waveguide Switch and Variable Attenuator for Millimeter-Wave Applications
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  • Thomas Jones ,
  • Alden Fisher ,
  • Douglas W. Barlage ,
  • Dimitrios Peroulis
Thomas Jones
University of Alberta

Corresponding Author:[email protected]

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Alden Fisher
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Douglas W. Barlage
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Dimitrios Peroulis
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This paper reports the design, fabrication, and measurement of a millimeter-wave solid-state ?pi-match waveguide switch using bulk silicon micromachining. A photogenerated plasma within a silicon post is utilized as the switching element within the waveguide channel. Not only does this isolate the switch bias network from the RF signal path, but allows for tuning of the OFF-state isolation with increasing optical power for application as a variable attenuator. A measured OFF-state isolation greater than 25 dB up to 40 GHz is reported, with a measured extracted ON-state insertion loss of 0.52 dB at 35 GHz, and less than 0.88 dB across the entire band from 30-40 GHz. The proposed switch illustrates the significant potential for photogenerated silicon plasma switching of high-performance bulk micromachined millimeter-wave waveguides.
Dec 2021Published in IEEE Transactions on Microwave Theory and Techniques volume 69 issue 12 on pages 5393-5403. 10.1109/TMTT.2021.3121692