11/07/2023
By Danielle Fretwell

The Francis College of Engineering, Department of Electrical and Computer Engineering, invites you to attend a Master's Thesis defense by Connor Pope on: Azimuthally Scanned Vivaldi Antenna Subarray Tile w/Increased Bandwidth for Ultra-Wideband Phase Array.

Candidate Name: Connor Pope
Degree: Master’s
Defense Date: Tuesday, Nov. 21, 2023
Time: 10 a.m. - noon
Location: Perry Hall 315

Committee

  • Advisor: Hualiang Zhang, Professor, Electrical and Computer Engineering, University of Massachusetts Lowell
  • Wei Guo, Associate Professor, Physics and Applied Physics, UML
  • Anhar Bhuiyan, Assistant PRofessor, Electrical and Computer Engineering, UML

Brief Abstract:
A 4-element Vivaldi subarray PCB tile is designed for 6 GHz to 18 GHz 1-D phased array scanning. Grating lobe suppression techniques and defected ground structures are used to extend the capable scanning bandwidth in both directions and improve the fractional bandwidth of the array. A 4x4 array is designed, simulated, and measured in the Anechoic chamber at UML. Scanning is achieved using an ADI beamforming integrated circuit, the ADAR4000 TX, which uses true-time delay with 2ps resolution. The balun used to feed the Vivaldi element is analytically designed and has ultra-wide bandwidth that is wider than the typical quarter wavelength balun used for Vivaldi elements.