Using this method, a rectangular microstrip patch antenna loaded with a shorting pin is designed which operated at mobile communication frequency.
该优化设计方法共分两步进行，首先，对天线的频率特性进行优化，然后在此基础上对天线的阻抗特性进行优化。
However, for the wireless mobile communication systems, the radio channel is frequency selective and time-varying.
对于无线通信系统，无线信道不仅是频率选择性的，而且是时变的。
The next generation mobile communication 4g called will support very high data transmission rate. It's necessary to introduce technology with high frequency utilization in limited frequency spectrum.
未来的新一代移动通信系统4g需要提供极高的数据速率，在有限的频谱下提供尽可能高的传输速率，这就需要采用高频谱利用率技术。
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