文件名称:
Basic Antenna Principles for Mobile Communications
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文件大小: 974kb
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上传时间: 2009-09-03
详细说明： In the last few years a large technological jump has taken place in the field of mobile communications due to the introduction of new mobile communication networks (GSM/PCN). The number of subscribers worldwide has risen to over 150 Million. The requirements o n the antennas needed for the ever expanding networks are becoming continually higher: – strictly defined radiation patterns for a most accurate network planning. – growing concern for the level of intermodulation due to the radiation of many HF-carriers via one antenna. – dual polarization – electrical down-tilting of the vertical diagram. – unobtrusive design. The following essay will give an insight into antenna theory in general, as well as the most important types of antennas and the special methods used for GSM/PCN systems. ...展开收缩
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