Optimization of a C-band Pulse Altimeter

In this paper, parameters of an old technology altimeter are discussed. Then, after deriving the measure of quality factor (height measurement accuracy), suitable solutions for improving the technology, namely decreasing its peak power (from 62.5 to 10.9w) to improve its LPI characteristics while maintaining its performance quality, are presented. In this altimeter, by interchanging older microwave devices such as a traveling-wave tube (TWT) with newer solid state devices, quality and LPI characteristics of these systems are improved despite the reduction in their size and cost. Therefore, access to systematic parameters of a pulse altimeter with low power, smaller weight and dimensions, higher security and defence capabilities is possible. In this way, it is of special importance to trade off the parameters and select an overall optimum solution.
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Gallium Nitride Applications

Gallium Nitride is an emerging technology that is rapidly being developed for both commercial and military applications. Its high power and efficiency make it ideal for power amplifiers ranging from L-band to W-band. With reducing material costs and conversion to 4” wafers, Gallium Nitride will become even more competitive in commercial markets.
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Design of a Miniaturized Quarter-circular-slot UWB Antenna

A miniaturized quarter-circular-slot UWB (QCS-UWB) antenna using field-pattern analysis of the circular-slot UWB prototype antenna is proposed. Even though the proposed antenna has only the quarter part of the prototype antenna it maintains UWB antenna characteristics. The measured gain of the miniaturized antenna from 3.0 GHz to 12.0 GHz is within -0.1 dBi ~ 1.6 dBi, which is comparable to the prototype antenna’s gain, -2.7 dBi ~ 3.1 dBi.
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