Investigation into and Development of Millimeter-wave Band Magnetrons in Kharkov

Pulsed and continuous-wave magnetrons (SWM) operating at millimeter wave bands (MWB). These devices were designed and developed at the A.Ya. Usikov Institute for Radiophysics and Electronics of the NAS of Ukraine (IRE NASU) in the period of 1955 through 2007 and at the Radioastronomical Institute of the NAS of Ukraine (RI NASU) over the same period (1985 through 2007). When designing the MWB magnetrons it makes sense to build a construction operating on a minus 1-st non-- mode harmonic. In this context the anode block is fitted with an equal-cavity periodic system of vane strip-free resonators. To increase the stability of the oscillating process it is advisable that a plus 1-st -mode operating harmonic be used. The distinctive design features of the magnetrons, their operating modes and energy characteristics are discussed. The parameters of the magnetrons operating on spatial harmonics are cited. The results from experimental studies into the magnetrons with a main cold-cathode and an ancillary side-thermionic cathode are outlined. It is shown that using cold, secondary-emission cathodes allows on to extend their service life, to improve their energy characteristics and to enhance their functional capabilities. The magnetrons operating on higher spatial harmonics of the non--mode electromagnetic field at frequencies between 35 to 150 GHz are found to offer the parameters. The field of application of the MWB radio-systems with SWM-based transmitters are briefly described. As regards the mm-wave applications the afore-mentioned magnetrons have no analogs round the worlds. oscillations to be substantially extended, their energy to be improved, and the functional capabilities to be increased. It is shown that over the frequency interval of 35 to 150 GHz the magnetron oscillators operating on higher space harmonics of non--mode oscillations have the parameters that meet the practical requirements.