楔形发射体的有效发射面积较大，能够承受较大的发射电流，并产生较高的跨导，因而更适用于大功率微波放大器。用有限元法对器件的性能进行了分析，计算出了器件内部电场和电势分布，用Fowler-Nordheim公式计算出了场致发射电流，得到了楔形发射体真空微三极管的电流发射特性，所得结果对器件的设计和制造有重要的参考价值。 Wedge-shaped emitter emits a larger effective area, can withstand a larger emission current, and produce a high transconductance, and thus more suitable for high-power microwave amplifier. The performance of the device is analyzed by finite element method, the electric field and potential distribution inside the device are calculated, the field emission current is calculated by the Fowler-Nordheim formula, and the current emission characteristics of the wedge-shaped emitter vacuum micro-transistor are obtained. The device design and manufacture of important reference value.