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Three-dimensional structure terahertz metamaterial absorbers with the properties of ultrabroadband and polarization-insensitive absorption were proposed. Different from the recent designs of the multilayer horizontal configurations, our design consists of the uniaxial anisotropic gold nanowire arrays that are filled in the frustum pyramid dielectric medium. The principle for the ultrabroadband absorption...
Attenuators for W-band folded waveguide TWT have been successfully fabricated using BeO and Al2O3 respectively. And these samples could meet the strict dimension requirements based on former design after repetitious attempts. Test system of attenuator was developed to test them, and test results showed good performance that can meet the practical requirements in W-band folded waveguide TWT.
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