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A compact high-power microwave TM01-TE01 mode converter.

Yong-Jun Hu1, Liang Xu2, Qiang Zhang2

  • 1Office of Facility and Laboratory Management, National University of Defense Technology, Changsha 410073, China.

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|October 2, 2021
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Summary
This summary is machine-generated.

This study presents a compact and efficient mode converter for high-power microwaves (HPMs), transforming the TM01 mode to the TE01 mode. The designed converter achieves over 98% transmission efficiency and handles over 1 GW, crucial for long-distance HPM transmission.

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Area of Science:

  • Electromagnetics and Wave Propagation
  • Microwave Engineering
  • High-Power Microwave (HPM) Technology

Background:

  • The TE01 mode in circular waveguides offers minimal transmission loss, ideal for long-distance high-power microwave (HPM) transmission.
  • HPM sources predominantly generate the TM01 mode, necessitating efficient TM01-TE01 mode conversion for practical applications.
  • Existing TM01-TE01 mode converters often lack compactness and are challenging to fabricate.

Purpose of the Study:

  • To design a novel, high-efficiency mode converter for transforming the TM01 mode to the TE01 mode for HPM applications.
  • To develop a compact and easily processable TM01-TE01 mode converter structure.
  • To experimentally validate the performance and power handling capabilities of the designed mode converter.

Main Methods:

  • Design of a compact mode converter comprising an input circular waveguide, tapered rectangular waveguide, 90° bent rectangular waveguide, and output circular waveguide.
  • Fabrication of a prototype device centered at 2.4 GHz.
  • Experimental testing of the fabricated prototype to measure transmission efficiency and power handling capacity.

Main Results:

  • Simulated transmission efficiency reached 99.8%.
  • Measured transmission efficiency exceeded 98%.
  • Measured power handling capacity surpassed 1 GW, consistent with simulations.

Conclusions:

  • The designed mode converter is compact, efficient, and suitable for HPM applications.
  • The device demonstrates significant potential for long-distance HPM power transmission.
  • This design offers valuable insights for future development of HPM mode converters and power transmission systems.