中文摘要：

相对论磁控管与普通磁控管效率形成了极大的反差．本文依据打上阳极表面的电子流剩余能量，分析了同步速度、电子小回旋运动、层流厚度、回旋半径、空间直流电荷场与强高频场对效率的影响，并以经典的S波段A6相对论磁控管为例，数值比较了效率随以上各因素的变化，结果表明：强高频场影响是造成相对论磁控管效率低下的主要原因，此结论通过粒子模拟也得到了证实．

英文摘要：

What causes relativistic magnetron to have much lower efficiency than common magnetron？ Based on the residual energy of electron stream at the anode, different factors affecting the relativistic magnetron＇ s efficiency,including synchronous velocity, gyral movement, depth of Brillouin flow, Lamour radius, DC space charge field and RF field, were analyzed. Comparing those factors in the typical A6 magnetron＇ s parameter, result shows that the intense RF field is the primary reason to lower relativistic magnetron＇ s efficiency. This conclusion was proved by the PIC simulation, too.