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Related Experiment Video

Updated: Dec 17, 2025

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

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Published on: July 24, 2015

Dynamically Tunable Phase Shifter with Commercial Graphene Nanoplatelets.

Muhammad Yasir¹, Patrizia Savi¹

¹Department of Electronics and Telecommunications, Politecnico di Torino, 10129 Torino, Italy.

|June 25, 2020

Summary

Researchers developed a tunable phase shifter using graphene nanoplatelets for microwave frequencies. This device, operating at 4GHz, achieved a 33-degree phase shift with minimal insertion loss.

Keywords:

commercial graphene nanoplatelets phase shifter tunable microwave devices voltage controlled microwave components

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Area of Science:

Electrical Engineering
Materials Science
Nanotechnology

Background:

Graphene's tunable conductivity in microwave frequencies enables novel electronic components.
Developing efficient tunable microwave components is crucial for advanced communication systems.

Purpose of the Study:

To introduce a tunable phase shifter utilizing commercial graphene nanoplatelets.
To optimize the design for maximum phase shift and minimal insertion loss at microwave frequencies.

Main Methods:

A microstrip line configuration with stubs and tapers was designed.
Graphene nanoplatelets were drop-casted into gaps and controlled via DC bias voltage.
Circuit modeling and full-wave simulations were employed for optimization.
A prototype operating at 4GHz was fabricated and experimentally validated.

Main Results:

The fabricated prototype demonstrated a phase variation of 33 degrees.
Minimal amplitude variation (less than 0.4 dB) was observed.
The design successfully leveraged graphene's tunable resistance for phase shifting.

Conclusions:

The proposed graphene-based tunable phase shifter is effective for microwave applications.
The design offers a promising solution for variable microwave components with low loss.
Further research can explore advanced graphene integration for enhanced performance.