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为了研究欧姆损耗对太赫兹波段真空电子器件工作特性的影响,本文推导了2.5维全电磁粒子模拟软件UNIPIC的表面阻抗边界条件,并采用软件对不同金属材料慢波结构的同轴结构表面波振荡器进行了数值模拟研究,分析了不同金属材料慢波结构器件的输出功率与电导率的关系,模拟结果表明:金属电导率对器件的输出功率有非常大的影响,对于0.14 THz同轴表面波振荡器,铜材料和不锈钢材料慢波结构器件的输出功率分别下降13.4%和63.9%,起振时间分别延迟0.4 ns和15 ns.
In order to study the effect of ohmic loss on the operating characteristics of terahertz band vacuum electronics, the surface impedance boundary conditions of 2.5-dimensional full electromagnetic particle simulation software UNIPIC are deduced. The surface acoustic wave oscillations of the coaxial structure of slow-wave structures with different metallic materials The numerical simulation results show that the conductivity of the metal has a very large influence on the output power of the device. For 0.14 THz coaxial surface wave Oscillator, copper material and stainless steel slow wave structure output power decreased by 13.4% and 63.9%, the start-up time delay 0.4 ns and 15 ns, respectively.