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Rapid 3D prototyping and fabricating of slow-wave structures, including electromagnetic meta-material structures, for millimeter-wavelength and terahertz-frequency high-power vacuum electronic devices

  • US 10,580,611 B2
  • Filed: 01/23/2015
  • Issued: 03/03/2020
  • Est. Priority Date: 08/21/2014
  • Status: Active Grant
First Claim
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1. A method, comprising:

  • 3D printing a slow-wave structure, the slow wave structure comprising;

    a unitary structure comprising;

    an outer wall extending longitudinally along a z-axis, the z-axis being perpendicular to an x-y plane, the outer wall enclosing a central region; and

    a plurality of sections, the sections being angularly spaced one from another around the central region, each one of the sections comprising;

    a periodic array of elements of electrically conductive material projecting radially inwardly from the outer wall in the x-y plane and terminating in the central region, the elements in each one of the sections being angularly spaced one from another in both the x-y plane and along columns disposed along parallel to the z-axis;

    wherein each one of the sections comprises;

    a plurality of rows of the elements, the elements in each one of the rows being angularly spaced one from another, and a plurality of columns of the elements, the elements in each one of the columns being angularly spaced one from another; and

    wherein the angularly spacing between the sections is greater than the angularly spacing between the elements in each one of the columns and each one of the rows.

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