TRAVELING-WAVE TUBES WITH NONPERIODIC DIELECTRIC CIRCUITS.
Technical rept. no. 7,
UTAH UNIV SALT LAKE CITY MICROWAVE DEVICE AND PHYSICAL ELECTRONICS LAB
Pagination or Media Count:
Dielectric circuits, which in the past have been considered to be unsatisfactory for use as slow-wave circuits in travelingwave interaction, are analyzed from the traveling-wave approach. The field and power propagation characteristics of the circuits are found using field techniques and the interaction impedance is calculated and averaged to allow for the variation of the electric fields over the region of the electron beam. The gain of the dielectric-circuit traveling-wave tube is calculated and gain characteristics are shown. Essentially four dielectric circuits are treated. Two circuits, a dielectriccoated conductor in a waveguide and an inhomogeneously dielectric-loaded rectangular waveguide, are found to have reasonable gain at X-band, but are very lossy at millimeter wavelengths. The other two circuits, a dielectric tube in a round waveguide and a dielectric plate between two semi-infinite conducting planes, are found to have reasonable gain at 300 Gc. All four circuits are narrow-band and require the electron beam to be very close to the dielectric. Author