Award Data

THIS PROPOSAL DESCRIBES A PLAN FOR THE IMPROVEMENT OF THE ANTENNAS OF A SAR CALIBRATOR. THE IMPROVEMENTS ARE SOUGHT IN TERMS OF LOW CROSS POLARIZATION, LOW SIDELOBE, LOW COST AND WEIGHT, IMPROVED STABILITY, ETC. WE PROPOSE TO USE NUMERICAL MODELING AND EVALUATE THE PERFORMANCE OF VARIOUS ANTENNA CONFIGURATIONS UNDER REALISTIC ENVIRONMENT. SEVERAL ANTENNA CONFIGURATIONS WILL BE CONSIDERED. RESULTS ...

FINITE ELEMENT CODE WILL BE DEVELOPED FOR ELECTROMAGNETIC SCATTERING FROM RADOMES. GENERAL PURPOSE FINITE DIFFERENCE AND FINITE ELEMENT TECHNIQUES FOR ANALYZING ARBITRARY-SHAPED AND INHOMOGENEOUS BODIES OF REVOLUTION HAVE RECENTLY BEEN DEVELOPED BY MITTRA AND HIS COWORKERS. THESE WILL BE ADAPTED FOR THE SPECIFIC SITUATION WHERE THE CLOSE PROXIMITY OF THE RADOME WILL BE TAKEN INTO ACCOUNT. THE RESU ...

THE NEED FOR A LONG ENDURANCE AIRCRAFT WHICH REQUIRES NO REFUELLING AND CAN PROVIDE SURVEILLANCE FOR NAVAL TASK GROUPS HAS BECOME EVIDENT. THE PROPOSED AIRCRAFT FOR THIS APPLICATION IS A MICROWAVE POWERED HALE PLANE. WITH THE USE OF MICROWAVE POWER BEAMING THE AIRCRAFT CAN BE CONTINUOUSLY ENERGIZED WHICH WOULD ALLOW MISSION DURATIONS OF MONTHS. THIS FIRST PHASE OF THE RESEARCH PROJECT WILL DETERMI ...

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OUR RECENT EFFORTS IN FABRICATING THIN-GAUGE GRAPHITE/MAGNESIUM COMPOSITES HAVE RESULTED IN THE FIRST SUCH MATERIAL TO HAVE A ZERO COEFFICIENT OF THERMAL EXPANSION AND NO PERCEPTIBLE DIMENSIONAL HYSTERESIS DURING CYCLING OVER THE ENTIRE ORBITAL TEMPERATURE RANGE OF -250 DEGREES FAHRENHEIT, EVEN AFTER 100 CYCLES. COUPLED WITH DENSITY OF LESS THAN 2 GRAMS PER CUBIC CENTIMETER, TENSILE STRENGTH OVER ...

SUCCESSFUL DEVELOPMENT OF HYPERSONIC FLIGHT VEHICLES AND ENGINES WILL DEPEND HEAVILY UPON RAPID DEVELOPMENT OF NEW, HIGH-TEMPERATURE METAL MATRIX COMPOSITE (MMC'S). FIBER REINFORCED TITANIUM ALUMINIDE ALLOYS HAVE GREAT POTENTIAL TO MEET THE ENGINEERING REQUIREMENTS OF SUCH STRUCTURES. CONSIDERABLE EFFORT HAS GONE INTO DEVELOPING THESE MMC'S WITH LARGE-DIAMETER SILICON CARBIDE FIBERS (5.6 MIL MONOF ...

RELIABILITY AND CIRCUIT DENSITY OF STANDARD ELECTRONIC MODULES (SEM) CAN BE INCREASED SIGNIFICANTLY BY TAILORING THERMOPHYSICAL PROPERTIES OF THE HEAT SINK MATERIALS. NEWLY DEVELOPED TECHNIQUES FOR MANUFACTURING METAL MATRIX COMPOSITES (MMC) BY VAPOR DEPOSITION METHODS WILL BE USED TO DEMONSTRATE LIGHT-WEIGHT, HIGH-PERFORMANCE HEAT SINKS HAVING THERAML CONDUCTIVITIES IN EXCESS OF 300 W/M-K AS WELL ...

LARGE, PERIODIC TEMPERATURE EXCURSIONS CAUSE SIGNIFICANT DIMENSIONAL CHANGES IN LARGE ORBITING SPACE STRUCTURES. SIMILARLY, LARGE GROUND-BASED ANTENNAS AND OPTICAL SYSTEMS ARE SUBJECT TO DIURNAL DIMENSIONAL CHANGES THAT DIMINISH PRECISION AND SENSITIVITY. OUR RECENTLY DEVELOPED GRAPHITE/MAGNESIUM METAL MATRIX COMPOSITES (MMC) HAVE BEEN SHOWN TO BE DIMENSIONALLY STABLE (ZERO CTE AND ZERO HYSTERESIS ...

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