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April 2010 [Communications] Forecast Rain Effects On Microwave Links, Part 2 Scatterers such as rainfall can impose hard-to-predict effects on the propagation of electromagnetic (EM) waves, often making analysis of the near-field and far-field antenna patterns and performance difficult. In order to provide a more meaningful approach to understanding the effects of scatterers on EM propagation, last month Part 1 of this study explored the influence of distributed scatterers on nearfield antenna EM propagation. Part 2 will now... March 2010 [Components] Forecast Rain Effects On Microwave Links Propagation of electromagnetic (EM) waves through the air is difficult to predict, due to atmospheric effects. Raindrops, for example, can act as scatterers that attenuate and affect the polarization of the propagating EM waves. Scattering theory has treated effects on the far-field regions of receive and transmit antennas in communications links, but not near-field effects. In this first of a two-part article, this analysis examines the nearfield ... June 2008 [Communications] Multibeam Antenna Serves Broadband Wireless Coms Multibeam antennas can provide increased wireless communications capacity with enhanced spectral efficiency and higher quality of service. One approach to designing such an antenna involves the use of space division multiple access (SDMA) techniques. SDMA methods provide high user capacity in a limited frequency spectrum without any major technological changes.1 SDMA techniques, which are implemented by most wireless service... |
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