Accession Number : AD0608214

Title :   A 36-40 KMC COUPLED LADDER BACKWARD-WAVE OSCILLATOR.

Descriptive Note : Rept. for Jul 62-Jul 64,

Corporate Author : UTAH UNIV SALT LAKE CITY MICROWAVE DEVICE AND PHYSICAL ELECTRONICS LAB

Personal Author(s) : Grow,R. W. ; Bowman,L. S.

Report Date : OCT 1964

Pagination or Media Count : 62

Abstract : Experimental results are reported for a four coupledladder backward-wave oscillator designed for the frequency band from 36-40 kMc. The voltage ranged from 14,000 to 20,000 volts and the power output was in excess of 20 watts at 40 kMc. The slow wave circuit consisted of four 0.005 in. think molybdenum planes separated by 0.010 in. with slots 0.142 in. wide having a pitch of 0.058 in. The electron beam was obtained by a convergent confined-flow cylindrical electron gun to eliminate beam rotation. The solid electron beam 0.116 in. in diameter flooded the ladder circuit with a measure current density of about 8 amps/sq cm. The output terminal was constructed with the individual ladders becoming ridges of a ridge waveguide. This technique was utilized to phase lock the waves on each ladder to obtain output only from the longitudinal mode. Good agreement was obtained between the theoretical and experimental starting current, tuning curve, and power output. The good agreement thus obtained indicates that coupled ladder backward-wave oscillators can be built utilizing the available theoretical results and the serious problem of producing a pure longitudinal mode in a coupled ladders can be solved. (Author)

Descriptors :   (*BACKWARD WAVE OSCILLATORS, MILLIMETER WAVES), COUPLING CIRCUITS, MICROWAVES, PROPAGATION, MOLYBDENUM, CARBON, MICA, ELECTRON BEAMS, FEASIBILITY STUDIES

Distribution Statement : APPROVED FOR PUBLIC RELEASE