具有光子晶体带隙结构的返波振荡器的初步研究
A novel BWO with photonic band gap structure
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摘要: 提出了一种新型的具有光子晶体带隙（PBG）结构的返波振荡器（BWO），利用PBG禁带对BWO工作及输出微波模式进行调制，抑制低次模式，工作在高次模式。通过数值模拟给出了介质柱PBG结构的能带图、禁带限制模式电场分布和周期慢波结构的色散关系曲线，选择晶格常数为0.31 cm，介质柱半径为0.12 cm，介电常数为4.0的三角格子PBG结构可以实现在Ka波段的单一类TM03模式工作，在36～40 GHz的频率范围内，器件可以工作在返波状态，周期长度为0.4 cm。Abstract: A novel back-ward wave oscillator (BWO) with photonic band gap (PBG) structure is proposed. The PBG structure offers mode-confining and choosing mechanisms, restraining the lower modes and making the BWO operate at the higher modes. With the method of numerical simulation, a single TM03-like mode is obtained at Ka band in a triangular lattice dielectric PBG structure with the medium cylinder radius 0.12 cm, the distance between the nearest rods 0.31 cm, and the permittivity 4.0. The complete dispersive characteristic of electromagnetic modes is obtained. During 36~40 GHz, the device can operate in back-wave situation with the period of 0.4 cm.
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Key words:
- pbg /
- bwo /
- single mode /
- dispersion properties
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