Methods and experimental design for high power measurements of materials and devices
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Abstract
Current trends in Radio Frequency (RF) devices, such as the miniaturization of RF devices, wide-bandwidth communications, wide use of radar, communications, and positioning systems lead to an increased need to understand how materials and devices respond to the increasing power and wider bandwidth electromagnetic en- ergy associated with these trends. Precise measurement of the electronic properties of materials leads to robust design and an important probe into the physics of the underlying materials’ properties. The work discussed in this dissertation attempts to improve measurement approaches of electronic properties and effects testing of complex devices for incident high-power microwaves. The work demonstrates the variations in common low-power approaches and the consideration that drives the difference. High-power microwave measure- ments are a delicate balance between producing the high powers required for inter- esting aspects of materials and protecting the sensitive equipment required for the measurement. A novel high-power measurement of materials’ electronic properties is presented. The measurement is enabled by introducing an outer air-gap in a material measured in a coaxial airline. Although the introduced air-gap reduces the effective conductivity reversibly, the reduction in conductivity protects both the material under test and the instruments used.
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Introduction and background -- Materials measurements approaches -- High power EMI/EMC measurement techniques -- Power dependent materials measurement -- Efficient short pulse generation -- STFT calibration of UWB pulses -- Open source effects literature review
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Ph.D. (Doctor of Philosophy)