Author: Sonny Lee

Georgia Tech Team at the 2023 IEEE AP-S/URSI

At the 2023 IEEE AP-S/URSI conference in Portland, Oregon, the Georgia Tech mmWave Antennas & Arrays team presented 5 presentations. On top of that, we had a wonderful reunion with one of our own alumni, Jiantong Li, who now works for Samsung Research America.

Our Noteworthy Presentations by students:

  1. “Characterization of VO2-Based Reconfigurable Linear-to-Circular Polarization Converter” by David West
  2. “On-Chip 60 GHz Coplanar Folded Slot Antenna with Air Cavity and Reflector” by Seung Yoon Lee
  3. “Vanadium Dioxide Aperture-Coupled mmWave 1-bit Reconfigurable Dual Polarization Reflectarray” by Walter Disharoon
  4. “Silicon Carbide Slot Dielectric Resonator Antenna for High Temperature and Power Applications” by Sree Adinarayana Dasari
  5. “Towards a 5G n260 Band Phased Array Based on Vanadium Dioxide Switches” by Sree Adinarayana Dasari

and lab Alumni:

“A D-band Low-cost High-gain Phased Antenna Array for 6G Applications” by Dr. Jiantong Li

Thermo-optic VO2-based silicon waveguide mid-infrared router is published in Optics Express

Our recent publication in Optics Express introduces novel research on a thermo-optic  VO2-based silicon waveguide mid-infrared router featuring asymmetric activation thresholds and large bi-stability. This study examines the routers’ performance, achieving power limiting levels of 56.5 dB in the forward operating mode and 64.5 dB in the reverse operating mode. Notably, the total transmission in the inactive mode reaches 75%. Furthermore, the study discusses the bi-stability and latching behavior exhibited by the router.

Citation: M. Lust*, I. Vitebskiy, I. Anisimov, and N. Ghalichechian, “Thermo-optic VO2-based silicon waveguide mid-infrared router with asymmetric activation thresholds and large bi-stability,” Optics Express, vol. 31, no. 14, pp. 23260-23273, 2023/07/03 2023, doi: 10.1364/OE.493895.

Reliability of VO2-Based mmWave Switches Article is Published in IEEE TDMR

Our new work on the reliability of VO2-based mmWave switches is recently published in the IEEE Transactions on Device and Materials Reliability. This study investigates the performance and reliability of vanadium dioxide (VO2) thin film shunt switches integrated with coplanar waveguide (CPW) in the mmWave frequency range of 35-45 GHz. Remarkably, even after subjecting the switches to 100 million cycles of thermal cycling, statistical analysis showed no degradation in the electrical properties of the VO2 switches.

Citation: S. Chen, M. Lust, A. Roo and N. Ghalichechian, “Reliability of VO2-Based mmWave Switches Under 100 Million Thermal Cycles,” in IEEE Transactions on Device and Materials Reliability, vol. 23, no. 2, pp. 241-248, June 2023, doi: 10.1109/TDMR.2023.3249771.

Walter Disharoon Receives GTRI Fellowship

GTRI’s Graduate Student Research Fellowship Program provides funding for seven new projects, including research on reconfigurable metasurfaces for high-power microwave systems. Led by graduate researcher Walter Disharoon, accompanied by ECE Professor Nima Ghalichechian and Dr. Joshua Kovitz, chief scientist of the electromagnetics division at GTRI, the project aims to develop versatile metasurfaces using vanadium dioxide (VO2) to manipulate electromagnetic waves. The team will focus on designing, fabricating, and characterizing the metasurfaces to enhance their functionality and defense capabilities. Congratulations Walter!

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