Meander Line Traveling wave tube THz Amplifier

We proposes to investigate innovative, traveling-wave tube amplifiers (TWTAs) compatible with three-dimensional (3D) micro-electro-mechanical systems (MEMS) fabrication techniques for submillimeter-wave applications. The development will focus on a novel meander line interaction circuit; long life, high current density electron guns; compact power supplies; and compact magnet configurations providing high-efficiency, compact, lightweight, and affordable devices. The batch nature of MEMS fabrication provides repeatability of components for increased yields and reliability, and reduced cost. During the Phase I effort, advanced, state-of-the-art simulation tools will be used to design a 650 GHz traveling wave tube amplifier providing approximately 800 mW of power. We will thoroughly investigate the interaction circuit for its thermal and electrical performance, including bandwidth and efficiency. In addition, major TWTA components will be designed, including the power supply, electron gun, and focusing structure. In parallel, MEMS fabrication techniques will be explored with the overall objective of integrating several TWT components into the fabrication procedure to avoid assembly and alignment procedures, which become increasingly difficult at higher frequencies. Continuing work will include fabrication and testing of a 650 GHz miniaturized TWTA with the goal of fabricating the entire system by MEMS techniques for "TWT on a chip" technology.