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Seminarios de Investigación: High-Performance Microwave Circuits

Escuela Politécnica Superior, Universidad Autónoma de Madrid
Zoya Popovic
Institución de origen
University of Colorado
Sala de Grados A (A-120) , Escuela Politécnica Superior, Universidad Autónoma de Madrid

This talk presents a brief overview of the activities in the microwave group at the University of Colorado, Boulder, in areas including: (1) high-efficiency microwave and millimeter-wave transmitters; (2) wireless powering; and (3) medical applications of microwaves. Specifically, record high-efficiency GaN amplifier designs at frequencies from 2 to 25GHz will be shown, and efficiency enhancement techniques overviews. The MMIC amplifiers are designed for radar and communication systems that transmit high peak-to-average power ratio (PAPR) signals with wide instantaneous bandwidths (>100MHz), and require new linearization techniques. Related to wireless powering, the talk overviews design of microwave receivers for far-field powering at very low incident power densities (<1uW/cm2), as well as near-field capacitive phased array for kW powering of cars in the MHz frequency range. Finally, two medical microwave applications are discussed: design of human- size bores for ultra-high field MRI (7, 10.5 and 16.5T); and design of portable radiometers for core- body temperature monitoring operating at low microwave frequencies that enable thermometry of tissue layers several cm under the skin. A few antenna-array projects will also be briefly presented

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