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Leveraging space-time modulation for energy coupling control in electromagnetic coupled transmission lines

Mohammad Baharian1, Jalil A Rashed Mohassel2

  • 1Center of Excellence On Applied Electromagnetic Systems, School of ECE, College of Engineering, University of Tehran, Tehran, Iran.

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This study introduces space-time modulation to control energy coupling in transmission lines, significantly reducing crosstalk. This novel technique engineers harmonic generation for improved signal integrity in microwave and THz circuits.

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Materials Science

Background:

  • Coupled transmission lines are crucial in high-frequency circuits.
  • Unwanted energy coupling (crosstalk) degrades signal performance.
  • Controlling electromagnetic coupling is essential for modern electronics.

Purpose of the Study:

  • To present a novel technique for controlling energy coupling in coupled transmission lines.
  • To demonstrate crosstalk reduction using space-time modulation.
  • To develop an efficient analytical method for analyzing space-time modulated transmission lines.

Main Methods:

  • Utilizing the space-time modulation concept to alter per-unit-length mutual capacitance and inductance.
  • Leveraging harmonic generation properties of modulated media.
  • Developing a state-space formulation combined with coupled mode theory for analysis.
  • Validating the analytical method using finite-difference-time-domain (FDTD) simulations.

Main Results:

  • Demonstrated that engineered harmonic amplitudes can effectively reduce crosstalk.
  • Developed a fast and accurate analytical method for space-time modulated coupled transmission lines.
  • Rigorously verified the analytical method against FDTD simulations.

Conclusions:

  • Space-time modulation offers a viable method for crosstalk reduction in coupled transmission lines.
  • The proposed analytical approach is suitable for practical design problems.
  • The technique shows promise for IC-compatible microwave circuits and THz applications with tunable materials like graphene.