Ⅰ.引言近年来,卫星通信系统的迅速而广泛的发展,促使地面站发射机需用较大功率的 G 及 X波段连续波行波管和速调管。随着使用者的数目和用途的增加,对瞬时带宽也提出了要求。在大多数的应用中,显然行波管是优先选用的管子,但在很多应用场合,为求简单,低成本 I. INTRODUCTION In recent years, the rapid and extensive development of satellite communication systems has prompted ground station transmitters to use G and X-band CW TWTs and klystrons. As the number and usefulness of users increases, demands are also placed on the instantaneous bandwidth. In most applications, it is clear that traveling wave tubes are the preferred pipe but in many applications, for simplicity, low cost