Subhanshu Gupta
Washington State University, WA·Engineering
Wireless networks are moving to millimeter-wave frequencies because the spectrum below 6 GHz is crowded. These high-frequency signals fade quickly, so base stations need many antennas that focus energy into narrow beams.
- Fields
Engineering
Computer Science
- Topics
millimeter wave
mmWave
wireless networks
- Grants
- 1 known grant, last ended Sep 2026
What they work on
- Use the frequency-dependent beams of true-time-delay arrays to cut beam-training overhead, and design a low-latency protocol that trains beams and estimates interference at the same time in dense millimeter-wave networks.
- Design wideband MIMO data communication with true-time-delay arrays that keeps beamforming gain high over a wide bandwidth while nulling interference from other base stations and users.
- Build a 16-element, 28 GHz true-time-delay antenna testbed with reconfigurable delay circuits, and use it to test squint-free beamforming, interference nulling and wideband MIMO.
More about the research
The usual design, the phased antenna array, runs into trouble as bandwidth and antenna count grow. Setting up a connection takes too long. Beams drift off target across frequencies, an effect called beam squint. Gain drops, and interference becomes hard to block in crowded areas.
Why it matters
Faster connection setup, stronger wideband beams and better interference control could make dense 5G and future millimeter-wave networks more practical. Lower cost and power for antenna-array radios could help network operators deploy the many base stations these high frequencies require.
Known grants
From NIH and NSF research grants. Labs often have other funding we can't see.
Closest labs
Thomas Marzetta
University of Maryland, MD·Engineering
Develop true time delay (TTD) beamforming methods, which steer signals with time delays instead of phase shifts, for ultra-wideband antenna arrays covering the 7–24 GHz upper mid-band, using the Radon transform as the mathematical framework.
Yasaman Ghasempour
Princeton University, NJ·Engineering·Early-career
Steer narrow terahertz beams electronically using a new multi-slit antenna, in which the beam's angle depends on the signal frequency and the slit geometry, to overcome the high signal loss at frequencies above 100 GHz.
Theodore Rappaport
New York University, NY·Engineering
Design and prototype a wideband liquid crystal-based reconfigurable intelligent surface (RIS) at 142 GHz, first passive and then active, using amplifier-integrated substrate-integrated waveguide elements.
The school
Washington State University: 22 labs on PI Pages, $403M a year on research, 259 research doctorates a year.
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