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This paper presents design details of Ku band 200W TWT with minimum saturated gain of 55 dB, electronic efficiency >30% and overall efficiency >60% in the frequency band of 10.7–11.7 GHz. This paper includes simulation results of TWT subassemblies as well as overall TWT performance. To achieve high electronic efficiency and interaction impedance, helix SWS parameters were optimized. The large signal modeling and simulations for SWS were carried out using large signal analytical code and Computer Simulation Technology (CST) particle studio [1]. Input section used a positive linear pitch taper for improving margins with respect to backward wave oscillation. Output section used a negative step taper for high electronic efficiency [2]. The Periodic Permanent Magnet (PPM) structure was optimized for optimum beam transmission [3]. Multi-stage depressed collector was designed to recover maximum spent beam power along with minimum electron backstreaming. Input coupler is a coaxial type coupler due to low power handling and high bandwidth requirement. Since the output coupler is required to withstand high power, a waveguide based coupler design (doorknob structure) was adopted [4, 5].

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Design and Simulation of High Efficiency Ku Band 200 W Helix TWT

  • 会议论文

  • 发表日期：

    2025年

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  • Aashka Oza,
  • Jitender Singh,
  • Ambrish Ghadiya,
  • Priyanka Natani,
  • Ramagiri Santhosh Kumar,
  • Shilpi Soni

摘要

This paper presents design details of Ku band 200W TWT with minimum saturated gain of 55 dB, electronic efficiency >30% and overall efficiency >60% in the frequency band of 10.7–11.7 GHz. This paper includes simulation results of TWT subassemblies as well as overall TWT performance. To achieve high electronic efficiency and interaction impedance, helix SWS parameters were optimized. The large signal modeling and simulations for SWS were carried out using large signal analytical code and Computer Simulation Technology (CST) particle studio [1]. Input section used a positive linear pitch taper for improving margins with respect to backward wave oscillation. Output section used a negative step taper for high electronic efficiency [2]. The Periodic Permanent Magnet (PPM) structure was optimized for optimum beam transmission [3]. Multi-stage depressed collector was designed to recover maximum spent beam power along with minimum electron backstreaming. Input coupler is a coaxial type coupler due to low power handling and high bandwidth requirement. Since the output coupler is required to withstand high power, a waveguide based coupler design (doorknob structure) was adopted [4, 5].