实现射频性能和批准

　　实现射频性能和批准

　　天线设计似乎和科学一样重要，但是通过遵循一些简单的设计规则，你就可以可靠地达到你的性能和批准目标。

　　在选择天线或天线设计并确定无线产品的机械规格之前，产品设计者必须清楚地了解产品必须达到的RF性能指标，以便：

　　在市场上取得良好的RF性能，确保市场的成功和

　　通过所有的监管和运营商的批准。

　　性能

　　基本概念-色氨酸，TIS和RSE

　　对于诸如GSM或CDMA这样的蜂窝应用，基本射频性能是根据能够在网络上可靠地传输和接收的产品来衡量的。测量性能的科学方法是在消声室。

　　The measurements numbers used are outlined below：

　　TRP – Total Radiated Power

　　This defines how much power is being radiated from the device and is measured in dBm. The higher this number， the better the device is able to transmit.

　　TIS – Total Isotropic Sensitivity

　　TIS – Total Isotropic Sensitivity This defines how low a signal the device can receive and demodulate. The lower this number （with a minus figure） the better the device can operate in weak signal environments.

　　RSE — Radiated Spurious Emissions

　　In practice this is the most difficult test for cellular products to pass， from Taoglas’ experience. These are radio waves output by the device which are above the power limit set by regulatory authorities to avoid interference. When a test confirms a radiated spurious emission over the limit either the device or the antenna must be modified to get it below the limit and thus pass certification. Otherwise the device cannot be sold in that country.