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In the early 1990's, AT&T engaged in an ambitious experimental program to evaluate the use of the 6 GHz band for wireless voice services. This paper summarizes some of the challenges faced in the trial, the experiments conducted to explore them and findings from those tests. Many of the same issues examined in the AT&T 6 GHz trial needs to considered by system planners of next generation wireless...
The hardsetting surface of many Alfisols in Australia is a limiting factor in crop production. Better soil management systems are required to improve productivity. This study reports the effects of several untested management systems, involving the combined effects of tillage (deep ripping (Rp), deep mouldboard ploughing (Mb) and disc ploughing (Disc)), irrigation layout (permanent beds, border...
The validity of the leaky cavity and transmission-line models to predict the far zone fields from a microstrip patch antenna is investigated. The prediction of this radiation requires a knowledge of the total current on the antenna. Since the approximate techniques utilise only the current on the bottom surface of the antenna, the relative importance of top and bottom surface currents are examined.
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