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The findings of experimental investigations into and the field fests of the X-band cold, secondary — emission cathode magnetron referred to as “Buton” are presented. The primary — electron producing source in this system are the field emitters (FE). In addition to this, the data on 3-D simulation of the secondary-electron multiplication (SEM) process in this type of magnetron are given. The batch-produced...
Studied the excitation efficiency of axially asymmetric oscillation TEM10q in an open resonator (OR) with the waveguide wave TE20. Found, that when consistent oscillations excitation in the OR took place, the latter had an angular and frequency selective spectrum. With the proper selection of geometric dimensions of the active coupling elements with the OR, one can provide a high power combining coefficient...
The present paper concerns the results of experimental investigations into terahertz frequency range of continuous-wave and pulsed reflex klystrons, the results are obtained by IRE NAS of Ukraine, in the 1960s. The current design of reflex nanoklystrons operating in the frequency range of 1???3 THz at operating voltage of ??? 1000 V is patented in 2010 ??? 2014. The nanoklystrons incorporate an electron-optical...
The results of the optimization search using an elaborated mathematical model for the promising versions of a klynoorbictron-amplifier design to be operated over the frequency range of 180 GHz are presented. The versions of the devices have been found, which are capable of providing from 10 to 14 % efficiency, the gain of 18???38 dB, the output power of 10 to 40 W with input signal power of 0.01???0...
The present paper concerns the activity of a famous radio physicist, an expert in the field of SHF physical electron-ics, the doctor of physical and mathematical sciences, professor Alexandr Georgiyevich Shein. Three periods of Prof. Shein's activity are singled out: in Kharkov, in the Crimea, and in Volgograd. It is noted, that in Simferopol State University the department of radio physics was organized...
The analytical estimation of optimal parameters is fulfilled for the terahertz M-type generator operating at frequency about 0.330 THz with anode voltage of 13 ??V and magnetic field of 0.7 T. Revealing from this model, the magnetron interaction space geometry providing the effective electron interaction with a high-frequency field on (+1) spatial harmonic of p-mode oscillations is proposed for the...
The principle of developing the pseudo-coherent radar [transmitter based upon the small-size cold-cathode magnetron (1kg)], which allows locating nearly objects and eliminating the influence of internal noise and of reflections from the sea surface, is presented. It allows locating small-size high-speed light vessels in a ship's wake.
The function circuit and performance characteristics of dual band radioelectronic facilities (DBRF) “Burevisnyk-3”, which is a new-generation complex integrated radio electronics system operating in the X-band and Ka-band wavelength with a unitary control system, are described. The above radar system is intended for technical surveillance and monitoring of open water area situation. It is located...
An unconventional principle of a constructing coherent pulse high duty-factor radar is described. It is shown that the function circuit of the coherent pulse radars that were built around the structural concept already described does not involve the phasing of a heterodyne reference signal.
An analytic estimate has been made of the optimal parameters of a pulsed cold secondary-emission cathode magnetron operating at a frequency of 32 GHz with anode voltage of 8 kV and magnetic field of 0.4 T. The magnetron interaction space geometry facilitates the interplay of electrons and the microwave-field of the (−1)-st space harmonic of π|2-mode oscillations. The numerical experiment involving...
An analytic estimate has been made of the optimal parameters of a pulsed cold secondary-emission cathode magnetron operating at a frequency of 32 GHz with anode voltage of 8 kV and magnetic field of 0.4 T. The magnetron interaction space geometry facilitates the interplay of electrons and the microwave-field of the 1-st space harmonic of π-mode oscillations. The numerical experiment involving the...
Modelling of oscillators and amplifiers of a millimeter and submillimeter range is spent. The mathematical model in which the space-charge of sheet beam and sagging of fields in gaps are considered. It is shown, that the calculation electron efficiency of orbotron-klystrons of oscillators at frequencies 100–200 GHz can reach 1–6 %.
Based upon the developed program that allows for the deposition of current on the slow-wave structure (SWS) the optimal parameters of a 3-mm wave orbictron and klinoorbictron operating at a 3-kV electron beam voltage have been calculated. The beam stratification effect in an orbictron has been studied. It is shown that using the klinotron effect results in efficient stratification compensation.
The calculations of HF-fields in the open resonator (OR) of a THz-range orbictron have been performed. It is shown that, as the OR immobile mirror has a rectangular resonance groove on the bottom of which a binary comb is arranged, one can increase, with the same Q-factor, a HF-field amplitude in the region of the sheet electron beam, at least, by a factor of 6.
The results obtained from optimizing the parameters of the electro-dynamic DRO-orbictron system with a periodic structure in the form of a binary comb placed in a rectangular groove on one of the open resonator (OR) mirror are presented. The rectangular groove acts as a quarter-wave transformer and is conductive to an increase in the resonance field amplitude in the transit channel between the combs...
Simulation of millimeter — and submillimeter oscillators has been performed. A mathematical orbotron-klystron (orboklystron) model is worked out, in which the space charge of a sheet electron beam and sagging of fields in gaps are considered. It is shown that the calculated electron efficiency of orboklystrons operating at 50 and 300 GHz may come up to 30 and 4% respectively.
A 35 GHz 3 kW spatial-harmonic magnetron employing 20-vane resonator is numerically and experimentally investigated. Simulated output power is 3.2 kW at beam voltage of 6.5 kV and anode current of 4 A using 3D PIC simulation. The measured resonant frequency for operation mode of p = 16 is 34.96 GHz.
The present communication is devoted to setting out the results from the analysis of prerequisites and prospects for designing and developing a coaxial magnetron which is operated in the THz-frequency range, specifically, at 0.14-0.15 THz.
Based upon the developed program that allows for the deposition of current on the slow-wave structure (SWS) the optimal parameters of a 3-mm wave orbictron and klinoorbictron operating at a 3-kV electron beam voltage have been calculated. The beam stratification effect in an orbictron has been studied. It is shown that using the klinotron effect results in efficient stratification compensation.
The coaxial klinoorotron with inhomogeneous focusing magnetic field in which the klinotron effect is applied to improve the efficiency of energy exchange between the tubular electron beam and electromagnetic field of the open coaxial cavity is investigated. It is shown that in this device with double electron optics at f = 100 GHz and at V0 =2,8 kV, B0max -0,4...0,436 T, B0min =0,266...0,338 T, IQ...
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