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The objectives of the current study are to quantitatively analyze the electromagnetic interactions with the electrons drifting around the cathode in the process of the microwave generation in a magnetron by performing three-dimensional (3D) electromagnetic particle-in-cell (PIC) simulations with a realistic model of the internal of a magnetron. For this purpose we have developed a new 3D electromagnetic...
The objective of the present study is to evaluate 2.45 GHz and 5.8 GHz oven magnetrons, toward a transmitter for space applications. Dc-rf efficiency and frequency spectrum of the oven magnetrons were measured. Significant improvement of efficiency and reduction of back bombardment energy must be necessary for the present 5.8 GHz oven magnetron to facilitate thermal management in space and to improve...
Axial distribution of the anode current in 2.45 GHz oven magnetrons was investigated with segmented-anode magnetrons. In the shielded-cathode magnetron, the anode current flew to the center of the anode vanes more than in the conventional-cathode magnetron.
The objective of the present study is development of a pulse-driven phase-controlled magnetron (PCM) in order to expand an application range of a magnetron. The pulse-driven PCM consists of a 2.45 GHz cooker magnetron, a high-voltage pulsed power supply, a reference signal and frequency/phase control circuits. The frequency and phase of the pulse- driven PCM are locked into those of the reference...
Converters that change DC power to microwave power are applied in various industries. Such converters can be categorized as magnetrons, traveling wave tubes (TWTs), and semiconductor converters. The magnetron has merits of high power and small size. The magnetron, as depicted in figure 1, can be a high- power transmitter for a space satellite, since the magnetron is a low-cost device and that is in...
A magnetron with a metallic cathode shield on the high voltage (HV) input side is newly designed for the purpose of reducing spurious noises generated from an oven magnetron. We experimentally found that the newly-designed magnetron suppressed sideband noises around the carrier frequency up to -10dB compared to the conventional magnetron. Moreover, both spurious noises in high frequency bands (4GHz~14GHz)...
In order to examine electron dynamics and the electromagnetic interaction in the process of the microwave generation in magnetron, we newly started to develop a three dimensional (3D) magnetron simulator with electromagnetic particle-in-cell (PIC) model. In the test simulation, we could confirm the nonlinear evolution of electrons' cross-field flow and associated microwave emission in magnetron. We...
A magnetron with a metallic cathode shield on the high-voltage (HV) input side is newly designed for the purpose of reducing the spurious noise generated from an oven magnetron. In this paper, it was experimentally found that the newly designed magnetron suppressed the sideband noise around the carrier frequency up to 10 dB, compared to the conventional magnetron. Moreover, both the spurious noise...
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