Effect of attenuator on oscillating process of coaxial magnetrons

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.