Carbon-Based Field-Emission Cathodes
This chapter reviews the main carbon-based materials that, by the authors’ opinion, are suitable for use in the manufacturing of field emission cathodes. Those are, first and foremost, polyacrylonitrile carbon fibers, carbon nanotubes, fullerenes, graphenes etc. The ways to improve the emission characteristics of carbon-based field emission cathodes and techniques of measurement of volt-ampere characteristics out of such materials are also discussed.
This paper presents SC-FDE implementation in HF communication.We introduce the basic theory of SC-FDE,and analyze the problems of PAR,frequency shift,computation complexity about SC-FDE.At last,we simulate the performance of SC-FDE in HF channel.The study shows that SC-FDE is a HF waveform design method equivalent to OFDM and has good future.