中文摘要：

用有限差分法计算了由金属棒按三角形晶格分布的二维光子晶体的带隙图，计算结果表明：当金属棒半径口和棒间距b比值小于0．2时，二雏光子晶体只有一务带隙，即若引入缺陷，可约束主模、抑制高次模．采用Microwave Studio计算了该种光子晶体微波加速结构的场型分布，结果显示当a／b〈0．2，类TM01模在缺陷中传输，类TM11模（横向模）能传出光子晶体．另外计算了结构尺寸公差对行波单元谐振频率的影响，还模拟计算了带有测试探针的由3个PBG单元构成的谐振腔的S参数．

英文摘要：

The global band gaps for general two-dlmenslonal （2D） photonic crystal formed by triangular arrays of metal posts were computed by finite-difference code. The results show that there is a global band gap when a/b〈0. 2 and the photonic crystal microwave accelerating structure with a missing rod at the center has advantages of higher-order-modes （HOM） suppression and main mode restriction. The electric field profiles calculated by Microwave Studio indicate that the PBG cell selectively supports the TM01-like mode and the next higher-order TM11-like mode can not be supported under the above condition. The dependence of the TW cell frequency on the dimension variance was presented. The S parameter of the resonator composed of three PBG cell with the test probes was also simulated.