Broadband-Printed Traveling-Wave Tube Based on a Staggered Rings Microstrip Line Slow-Wave Structure

Abstract

To increase the output power of microstrip line traveling-wave tubes, a staggered rings microstrip line (SRML) slow-wave structure (SWS) based on a U-shaped mender line (U-shaped ML) SWS and a ring-shaped microstrip line (RML) SWS has been proposed in this paper. Compared with U-shaped ML SWS and RML SWS, SRML SWS has a wider transverse width, which means SRML SWS has a larger area for beam–wave interaction. The simulation results show that SRML SWS has a wider bandwidth than U-shaped ML SWS and a lower phase velocity than RML SWS. Input/output couplers, which consist of microstrip probes and transition sections, have been designed to transmit signals from a rectangular waveguide to the SWS; the simulation results present that the designed input/output structure has good transmission characteristics. Particle-in-cell (PIC) simulation results indicate that the SRML TWT has a maximum output of 322 W at 32.5 GHz under a beam voltage of 9.7 kV and a beam current of 380 mA, and the corresponding electronic efficiency is around 8.74%. The output power is over 100 W in the frequency range of 27 GHz to 38 GHz.

Design of a Low Voltage and High Power Traveling Wave Tube Based on a Sheet-Beam Rectangular Ring-Bar Slow-Wave Structure

“…All these characteristics are fundamental for aerospace applications, in which one of the main goals is to minimize both power consumption and weight. In the last years, several configurations of sheet-beam TWTs have been proposed [6]- [13]. Some of them are able to operate with a very low voltage, such as the one proposed by Wen et al [10]: a concentric arc meander line capable of operating with a voltage of 720 V. A similar configuration, able to work with a voltage of 791 V, has been proposed by Wang et al [11].…”

High-Frequency Vacuum Electron Devices

“…One paper [3] is based on the design of multiple Dielectric-Supported Ridge-Loaded Rhombus-Shaped Wideband Meander-Line Slow-Wave Structures for a V-Band TWT; the simulations show that the structure has a larger bandwidth, higher gain, more stable structure, and better heat dissipation ability. For high-power TWTs with meander-line SWSs, a staggered-ring micro-strip line (SRML) structure [4] is proposed and designed in the paper of "Broadband-Printed Traveling-Wave Tube Based on a Staggered Rings Micro-strip Line Slow-Wave Structure", and the input and output structures with micro-strip probes and transition sections are also shown. The particle-in-cell (PIC) simulation results indicate that the SRML TWT has a maximum output of 322 W at 32.5 GHz under a beam voltage of 9.7 kV and a beam current of 380 mA, and the output power is over 100 W in the frequency range of 27 GHz to 38 GHz.…”