Category: News

Seung Yoon Lee Receives IEEE 2023 Antennas & Propagation Society (AP-S) Doctoral Research Grant

Seung Yoon (Sonny) Lee was awarded the prestigious IEEE 2023 Antennas & Propagation Society (AP-S) Doctoral Research Grant. The grant awards $5000 to only 10 PhD students globally every year to support students in their pursuit of careers in electromagnetics. Sonny’s project aims to develop a highly efficient on-chip antenna array operating in the mmWave band, incorporating low-loss vanadium dioxide (VO­­­­2) switches through monolithic integration. The primary objective is to design, fabricate, and characterize a 60 GHz electronically scanned array for high-speed wireless systems.

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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

Sonny receives the IEEE Ph.D. Student Travel Grant

Seung Yoon (Sonny) Lee, a Ph.D. student, was awarded the IEEE Ph.D. Student Travel Grant during the 2023 IEEE AP-S/URSI meeting in Portland, Oregon. This competitive grant is a recognition of excellence in their field of research, with 20 exceptional applicants, including Sonny, chosen to receive this travel grant, amounting to $1000 USD per recipient. (Link)

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.