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Design and Implementation of Graphene-Based Tunable Microwave Filter for THz Applications.

Cleophas D K Mutepfe1, Viranjay M Srivastava1

  • 1Department of Electronic Engineering, Howard College, University of KwaZulu-Natal, Durban 4041, South Africa.

Nanomaterials (Basel, Switzerland)
|December 23, 2022
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Summary

This study presents a tunable terahertz Substrate-Integrated Waveguide (SIW) filter using graphene. Applying DC voltage or altering graphene dimensions reconfigures the filter

Keywords:
chemical potentialgraphenenanomaterialnanotechnologysiliconsilicon dioxidesubstrate-integrated waveguide

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Area of Science:

  • Terahertz (THz) technology
  • Microwave engineering
  • Materials science

Background:

  • Substrate-Integrated Waveguide (SIW) filters are crucial components in modern communication systems.
  • Achieving reconfigurability in THz filters is essential for advanced signal processing and tunable applications.
  • Graphene's unique electronic properties offer potential for tunable microwave and THz devices.

Purpose of the Study:

  • To design and demonstrate a reconfigurable Substrate-Integrated Waveguide (SIW) filter operating in the terahertz (THz) frequency range.
  • To investigate the tunability of the SIW filter using graphene via electrical bias and geometrical modifications.
  • To analyze the impact of these tuning mechanisms on the filter's center frequency and bandwidth.

Main Methods:

  • A second-order SIW filter was designed using a double-layer substrate (silicon and silicon dioxide) coupled via a magnetic iris.
  • Graphene was integrated as a tunable element sandwiched between the dielectric layer and the upper ground plane.
  • The filter's center frequency was tuned by applying an external DC bias voltage to modulate graphene's chemical potential and by altering the graphene patch's aspect ratio.

Main Results:

  • Electrical tuning using DC bias shifted the filter's center frequency from 1.289 THz to 1.297 THz, achieving an 8 GHz bandwidth tuning range.
  • Geometrical tuning by changing the graphene patch aspect ratio resulted in a frequency shift within the range of 1.2908 THz to 1.2929 THz, with a 2.1 GHz bandwidth change.
  • The proposed design demonstrates effective tunability for THz SIW filters.

Conclusions:

  • The developed graphene-tunable SIW filter offers a viable solution for reconfigurable THz systems.
  • Both electrical and geometrical tuning methods provide effective control over the filter's operational frequency.
  • This work contributes to the advancement of tunable components in the THz frequency spectrum.