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Jie Huang1, Tao Wei2, Jun Fan2

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Researchers developed a novel microwave coupler using parallel coaxial cable Bragg gratings. This device enables precise control over electromagnetic coupling frequencies and strength, offering tunable bandwidth for advanced applications.

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Microwave Engineering

Background:

  • Coaxial cables are fundamental transmission lines.
  • Bragg gratings are periodic structures used for wave manipulation.
  • Controlling electromagnetic coupling is crucial for microwave devices.

Purpose of the Study:

  • To report a novel microwave coupler.
  • To demonstrate electromagnetic coupling between parallel coaxial cables.
  • To investigate the tunability of coupling characteristics.

Main Methods:

  • Fabrication of coaxial cable Bragg gratings by drilling U-grooves.
  • Experimental detection of electromagnetic field couplings at near and far ends.
  • Theoretical modeling using transfer matrix method.

Main Results:

  • Observed electromagnetic field couplings at discrete frequencies.
  • Demonstrated precise control over coupling frequency and strength via grating period and length.
  • Showed tunable coupling bandwidth through grating design.
  • Transfer matrix model matched experimental results well.

Conclusions:

  • The proposed coaxial cable Bragg grating coupler is a viable device.
  • The device offers precise and tunable control over electromagnetic coupling.
  • This technology has potential applications in microwave systems and signal processing.