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This paper investigates the widely linear processing (WLP) for the detection of circular signals, such as M-ary phase-shift keying (MPSK) signals and M-ary quadrature amplitude modulation (MQAM) signals. First, a unified mathematical model is derived to describe the conjugate symmetry of general MPSK/MQAM signals. In the unified model, a phase-rotation matrix (PRM) is introduced to partition the constellation...
The Cusp electronic gun for Ka band Gyro-TWT is simulated by the 3D PIC software, in which the electronic 3D velocity value is extracted to calculate the velocity ratio of the transverse velocity and longitudinal velocity. The Cusp gun is designed and optimized in 98kV voltage and 1A current, to obtain 1.1 velocity ratio and 2.4% velocity spread. The design is adopt for the three folded helical corrugated...
The design of double anodes magnetron injection gun (MIG) for 3 mm gyrotron is described in the paper. Based on the beam-wave interaction parameters in the gyrotron cavity, some structure parameters of the MIG are primarily designed by theory calculation. The simulation calculation using PIC code is done to verify the structure design of the MIG and to obtain some physical parameters of the electron...
Corrugated-wall waveguides have been widely used in Backward-Wave Oscillators (BWOs) which are commonly drove by annular beam with certain thickness. With finite-strength guiding magnetic field the beam region tends to be dispersive medium and the dielectric tensor makes the axial RF electric field correlative with RF magnetic field even under axisymmetric mode. The linear dispersion relation is obtained...
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