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The designs of a 220 GHz folded waveguide traveling wave tube (FWTWT) have been reviewed and studied systematically via 3-D electromagnetic particle-in-cell (EM PIC) simulations. 3-D Cold test simulations using both the CFDTD and FEM methods have been carried out and compared with each other as basis for the hot test simulations. The hot test simulation results show that the gain-bandwidth features...
The start-oscillation-current of a gyro-TWT determines the stable operating current level of the device. The amplifier is susceptible for oscillations when the operating current level is higher than the start-oscillation current. There are several ways of calculating the start-oscillation current, including using the linear theory of a gyro-TWT. In this paper, we present a simple way of determining...
Power combined millimeter-wave power module (MMPM) is under development for high data rate communications and high-resolution radar applications. The MMPM is comprised of V-band traveling-wave tubes (TWT) that are capable of wide-bandwidth operation with moderately high power. The TWTs are designed with various simulation codes. The circuit utilizes T-shaped BeO support rods. The computational procedures...
Summary form only given. The need for millimeter-wave amplification and its application has been grown rapidly in conjunction with millimeter-wave solid state device development and advancement in microfabrication techniques. This paper present design and analysis of a V-band millimeter-wave traveling wave tube amplifier. Two different slow wave structures (SWS), tunneladder and folded waveguide,...
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