Traditional and novel vacuum electron devices

This paper describes some vacuum devices - including conventional and unique multibeam O-type amplifiers and oscillators in the microwave, millimeter wave, and submillimeter wavelength regions of the spectrum, and miniature injection locked M-type amplifiers. Main parameters and operational characteristics are presented. The paper includes a description of synthesis software, which uses "trained" analytical expressions. These codes enable the optimum electrical design and device geometry to be expeditiously determined during the first phase of development.