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High Speed Electronics Group |
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Ph.D. Theses
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High-Frequency
Wireless Systems (5/6G) As the demand
for wireless increases, systems are migrating to higher carrier frequencies,
as these can provide wider available bandwidths and substantial spatial
multiplexing even with physically small arrays. Against these advantages,
higher-frequency systems have shorter range, this due to high l2/R2 path losses and high atmospheric
attenuation. As of mid-2023, deployment of 38 GHz 5G cell phone links has
been slowed by challenges with cost, range, and beam blockage. Focusing on 20-200
GHz carrrier frequencies, we seek to develop new system, array, module (package),
and IC designs that address the limitations of high-frequency systems. The goal
is affordable, robust, high-capacity, mobile communications. High-Frequency
Integrated Circuits and Arrays We are developing
ICs for 50-300 GHz communcations and radar (imaging) systems, including
low-noise amplifiers, efficient power amplifiers, full transmitters and
recievers, and single-beam and multi-beam phase arrays. High-Frequency
Transistors for Wireless High-frequency
ICs need high-frequency transistors. In useful, high-performance ICs,
transistor power-gain cutoff frequencies must be 3:1 to 10:1 greater than the
signal frequencies. In the past, our group, in collaboration with Teledyne, pioneered
the development of THz InP bipolar transistors. More recently, we have been developing InP-based
FETs for high-frequency low-noise receivers. |
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University of California, Santa
Barbara Department of Electrical &
Computer Engineering University of California, Santa
Barbara, CA, 93106 |
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