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Final performance report of the Young Investigator Program (YIP) project titled 'High-Power Microwave Metamaterials for Phased-Array, anti-HPM, and Pulse-Shaping Applications' is presented in this document. The research conducted ...
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Final performance report of the Young Investigator Program (YIP) project titled 'High-Power Microwave Metamaterials for Phased-Array, anti-HPM, and Pulse-Shaping Applications' is presented in this document. The research conducted in this project resulted in a number of unique devices for operation in high-power microwave systems. Specifically, for the very first time, high- power frequency selective surfaces capable of handling extremely high-power levels were introduced and experimentally demonstrated. Other major findings of this project include the introduction, development, and experimental demonstration of two new classes of ultra-wideband, true-time-delay, and high- power-cable microwave lenses suitable for operation in high-power phased-array antennas and electronic attack systems. Through the basic research conducted in this project, a better understanding of breakdown and plasma generation in high- power microwave periodic structures and metamaterials was achieved. This new understanding resulted in the development of new techniques for creating fast acting, distributed discharge limiters as well as periodic plasma layers. Finally, the use of metamaterials in high-power microwave amplifiers was investigated and a new concept for designing high-power, millimeter-wave traveling wave tubes was introduced and verified using computer-based simulations.
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We account for experimental and observational uncertainties in likelihood analyses of cosmic microwave background (CMB) anisotropy data from the MAX 4 and MAX 5 experiments.
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An end-to-end microwave receiver system contained in a single miniature hybrid package mounted on a single heatsink is presented. It includes an input end connected to a microwave receiver antenna and an output end which produces ...
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An end-to-end microwave receiver system contained in a single miniature hybrid package mounted on a single heatsink is presented. It includes an input end connected to a microwave receiver antenna and an output end which produces a digital count proportional to the amplitude of a signal of a selected microwave frequency band received at the antenna and corresponding to one of the water vapor absorption lines near frequencies of 20 GHz or 30 GHz. The hybrid package is on the order of several centimeters in length and a few centimeters in height and width. The package includes an L-shaped carrier having a base surface, a vertical wall extending up from the base surface and forming a corner therewith, and connection pins extending through the vertical wall. Modular blocks rest on the base surface against the vertical wall and support microwave monolithic integrated circuits on top surfaces thereof connected to the external connection pins. The modular blocks lie end-to-end on the base surface so as to be modularly removable by sliding along the base surface beneath the external connection pins away from the vertical wall.
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We have developed a model for microwave heating of a sphere in a rectangular resonant cavity. The model calculates transient temperature distributions within a sphere during the approach to steady state conditions or on the path...
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We have developed a model for microwave heating of a sphere in a rectangular resonant cavity. The model calculates transient temperature distributions within a sphere during the approach to steady state conditions or on the path to thermal runaway.
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Three lectures will be given. The first one will draw from the general literature on microwave sounding from space. The next two will focus on a description of the Microwave Limb Sounder (MLS) and results obtained from its meas...
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Three lectures will be given. The first one will draw from the general literature on microwave sounding from space. The next two will focus on a description of the Microwave Limb Sounder (MLS) and results obtained from its measurements relating to atmospheric chemistry and dynamics; this will draw from material recently published (or soon-to-be published) by the MLS team.
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