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Metamaterials have aroused tremendous interests in recent years owing to their peculiar electromagnetic (EM) properties and fascinating potential applications, e.g., invisibility cloak, perfect lens, etc.
Two output structures constructed by multiple apertures in E-and H-planes were designed for a W-band broadband sheet beam traveling wave tube (TWT). E-plane coupler can achieve 32% relative bandwidth and perform excellent port isolation. In comparison, another output coupler built by multi-aperture in H-plane was demon-strated, which is much convenient for PCM focusing system and can be easily integrated...
Coherent terahertz radiation obtained from double bunched sheet electron beams over a surface evanescent wave provides an effective method to extend the operating frequency and power capacity. An overmoded ridge-loaded grating waveguide was introduced in our double sheet beam backward wave oscillator (BWO) design. The fundamental mode TM11 was updated to the TM21++ mode, which is compact to integrate...
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