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In order to develop miniaturized and integrated electron vacuum devices, the multi-beam modulation in a carbon nanotube (CNT) cold cathode electron gun is investigated. Steady field-emission electron beams are modulated in an electron gun by feeding a high-frequency field between the cathodes and the anode. Simulation results of multi-beam electron gun show that phase modulation of beam can be controlled...
A receiver structure based on a joint LDPC decoding and synchronization algorithm and realized on an FPGA platform is introduced. The realization system achieves the BER of 1e-5 at the channel SNR of -4.6 dB with moderate hardware complexity, and the performance degradation is less than 1.3 dB from the ideal situation. So it is suitable for deep space communications and other wireless communications.
One kind of experimental table wireless control system of open laboratory is studied based on ZigBee technology. Test result indicates the system can satisfy the requirement of real-time monitoring experimental table in open laboratory. The application of system can insure the reliability of data transmission, coat down the maintenance resource of equipment and it is helpful to manage open laboratory.
This paper presents an improved and simplified method to design electromagnetic interference (EMI) filters for communication power supplies. Based on the measurement of the maximum and the minimum differential mode (DM) and common mode (CM) EMI noise source impedance, a method is proposed to suppose the noise source as current source and calculate the magnitude of DM and CM noise source current. Then...
Injection of background plasma into the beam-wave interaction region can greatly enhance the beam-wave interaction efficiency and the microwave output power of the device. In this paper, a new type of plasma-filled slow-wave structure, i.e., plasma-filled, dielectric-loaded coaxial cylindrical waveguide with a dielectric ring enclosing tightly the inner conductor, is developed. The Cherenkov radiation...
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