Planar Bragg reflector operating in the sub-terahertz wavelength installed at the upstream end of a sheet beam back- ward wave oscillator （BWO） is very promising to minimize the whole circuit structure and make it m...Planar Bragg reflector operating in the sub-terahertz wavelength installed at the upstream end of a sheet beam back- ward wave oscillator （BWO） is very promising to minimize the whole circuit structure and make it more compact. In this paper, a sub-terahertz wavelength （0.18-0.22 THz） tunable planar Bragg reflector is numerically analyzed by using multi-mode coupling theory （MCT）. The operating mode TE10 and dominant coupling mode TE01 are mainly considered in this theory. Reflection and transmission performance of the reflector are demonstrated in detail and the results, in excellent agreement with the theoretical analysis and simulation, are also presented in this paper. Self- and cross-coupling coefficients between these two modes are presented as well. The reflector behaviors with different Bragg dimensions are discussed and analyzed in the 0.16-0.22 THz range. The analysis in this paper can be of benefit to the design and fabrication of the whole BWO circuit.展开更多
设计了一个过模太赫兹返波管振荡器,通过对慢波结构的精心设计,使电子束动能得到充分提取,实现器件的大功率及高效率运行。在电子能量和束流分别为280keV和320A的条件下,当引导磁场强度为3T时,采用2.5维Particle in Cell(PIC)程序模拟...设计了一个过模太赫兹返波管振荡器,通过对慢波结构的精心设计,使电子束动能得到充分提取,实现器件的大功率及高效率运行。在电子能量和束流分别为280keV和320A的条件下,当引导磁场强度为3T时,采用2.5维Particle in Cell(PIC)程序模拟得到频率为121.8GHz、功率为13MW的太赫兹波输出,器件的束波转换效率约为14.5%。展开更多
基金supported by the National Natural Science Foundation of China(Grant No.G0501040161101040)
文摘Planar Bragg reflector operating in the sub-terahertz wavelength installed at the upstream end of a sheet beam back- ward wave oscillator （BWO） is very promising to minimize the whole circuit structure and make it more compact. In this paper, a sub-terahertz wavelength （0.18-0.22 THz） tunable planar Bragg reflector is numerically analyzed by using multi-mode coupling theory （MCT）. The operating mode TE10 and dominant coupling mode TE01 are mainly considered in this theory. Reflection and transmission performance of the reflector are demonstrated in detail and the results, in excellent agreement with the theoretical analysis and simulation, are also presented in this paper. Self- and cross-coupling coefficients between these two modes are presented as well. The reflector behaviors with different Bragg dimensions are discussed and analyzed in the 0.16-0.22 THz range. The analysis in this paper can be of benefit to the design and fabrication of the whole BWO circuit.
文摘设计了一个过模太赫兹返波管振荡器,通过对慢波结构的精心设计,使电子束动能得到充分提取,实现器件的大功率及高效率运行。在电子能量和束流分别为280keV和320A的条件下,当引导磁场强度为3T时,采用2.5维Particle in Cell(PIC)程序模拟得到频率为121.8GHz、功率为13MW的太赫兹波输出,器件的束波转换效率约为14.5%。
