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Progress on the Fabrication and Test of an Extended Interaction Klystron with a New Photonic Bandgap Topology

Prior research regarding the development of a W-band extended interaction klystron (EIK) with a photonic bandgap (PBG) based interaction circuit suggests that conventional PBG geometries, which have been demonstrated with larger dimensions are not the ideal choice for smaller, millimeterwave EiKs. In this presentation, a new, practical PBG geometry, which may be directly machined is presented. A 2D finite element Eigenmode solver is developed and utilized to calculate the electromagnetic properties of the PBG, including the global frequency bandgaps.