通过建立X波段同轴磁控管模型，对起振过程进行PIC模拟，结果表明: 当衰减瓷损耗角正切大于0.010时，起振过程中可能受干扰模影响，但均能正常工作; 当选用损耗角正切为0.001或不具有衰减性能的材料时，磁控管可能无法正常工作。因此同轴磁控管中需要选用损耗角正切大于0.010的电介质材料。进一步对该磁控管进行冷态微波特性模拟研究，重点分析了磁控管主模、N/2-1干扰模在不同参数衰减瓷下的品质因数，模拟结果表明衰减瓷位置合理，当损耗角正切大于0.010时，对N/2-1模的吸收效果明显改善，验证了PIC模拟的结论。

PIC simulation is taken to get the oscillating process of the X band coaxial magnetron. Though the oscillating process would be affected by the spurious mode, the magnetron could work properly if the loss tangent of the attenuator exceeds 0.010. Otherwise the magnetron would be unable to work. So attenuators with loss tangent exceeding 0.010 are needed for coaxial magnetrons. The quality factors of the prime mode and N/2-1 mode in coaxial magnetrons with different attenuators are obtained. The results indicate that it would be effective to absorb N/2-1 mode if the loss tangent of attenuators exceeds 0.010, confirming the PIC results.