文件名称：Basic Antenna Principles for Mobile Communications
文件大小：974KB
文件格式：PDF
更新时间：2012-09-23 03:41:03
Antenna Mobile communication
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 on 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.