Röhre mit induktiver Auskopplung mit mehrstufigen Bremsfeldkollektor-Elektroden

摘要

A high efficiency linear amplifier comprises an electron gun assembly (12), having a cathode (15), and an anode (16), the cathode being operable at a high voltage potential relative to the anode to form and accelerate an electron beam. A control grid (14) is disposed between the cathode and the anode, and is biased relative to the cathode for Class B operation. A high frequency e.g. UHF input signal is applied to the control grid to density modulate the electron beam. A shadow grid may be disposed between the control grid and the cathode. A drift tube encloses the beam and includes a first portion (22) and a second portion (24) separated by a gap (27). An inductive output cavity (10) communicates with the gap, and the density modulated electron beam passed across the gap induces an RF electromagnetic signal into the cavity. A multistage depressed collector (30) accepts and dissipates the electrons of the beam which remain after transit across the gap. Each of the collector stages has electric potential applied thereto ranging between ground and the cathode potential to efficiently collect the electrons. The electric potential can be specifically selected to preclude the collection of electrons at the beam potential and maximize the efficiency of the amplifier. <IMAGE>