We investigated the foundations for high-frequency vacuum electron devices experimentally,
with emphasis on deep etch X-ray lithography: lithographie, galvanoformung, abformung …

The interaction structures used in microwave tubes that continue to be important despite
competitive incursion from solid-state devices can have the periodicity of both the axial and …

To improve the performance of a broadband traveling-wave tube (TWT), a helix pitch profile
incorporating a section with reduced phase velocity followed by a positive phase-velocity …

The effectiveness of positive phase velocity tapering to improve the performance of a
broadband helix traveling-wave tube (TWT) has been investigated. A large-signal model of …

In part I of the present paper, we analysed helical slow-wave structures of travelling-wave
tubes (TWTs) taking into account the space harmonic effects arising from the axial periodicity …

The dispersion equation and interaction impedance of a U-shaped vane-loaded helical slow-
wave structure (SWS) is obtained by considering the azimuthal space harmonic in the non …

The cold parameters including the dispersion properties and the average interaction
impedance of a sheath eccentric helix slow-wave structure in a circular waveguide are …

The high frequency characteristics and beam wave interaction characteristics of a Ka-band
(26-40GHz) helix traveling wave tube (TWT) with rectangular semi-metallic rod are …

A simple field analysis was developed for helical slow-wave structure symmetrically
supported by rectangular shaped discrete dielectric support rods partially embedded in the …

A simple metamaterial loading scheme for a helical slowwave structure was proposed in lieu
of a conventional metal vane loading. The proposed structure consists of a helix in a metal …