Return Loss ,TRP,TIS,efficiency等之间的关系?
TRP 是测试手机的全向辐射功率,GSM标准在30dBm左右。
TIS是测试手机的全向接收sensitivity,GSM标准是-100左右。
Return Loss and efficiencyReturn loss 是两个不同的概念,
回损好,天线效率不一定高,因为回损小只是表示能量被反射回来的少,但有多少辐射出去了却不能保证,所以得看效率值。话说回来,如果回损高,那效率一定好不到哪去了
,就是看天线的发射性能。是实际通过天线耦合后发射的功率与理论值的比值。
总辐射功率(TRP)=所有各方向点测时的辐射功率(EIRP)的总和
而且好象是用频谱仪测的.
这使偶想起 天线效率的测试来啦:
天线的效率=辐射总功率/输入总功率=(EIRP1+EIRP2+...)/(Pin1+Pin2+...)
其中EIRP/Pin=S21
测试时用网络仪, 将各方向点测的S21全加起来,就是平均效率吧.
即:平均天线的效率= EIRP1/Pin1+EIRP2/Pin2+....
TRP如果是在暗室里测量,TRP就为各方向的辐射功率球积分得出
效率=TRP/conducted power
conducted power是手机当前从PA端出来的双工器测量的现测值,即当前的输出功率
总辐射效率计算方法:
设天线辐射效率为:a;S11为b(它为负值)。
总辐射效率=a * exp(b/10)
The terminal efficiency of antenna lies on antenna efficiency and match efficiency, match efficiency can be calculated by Return Loss. But antenna efficiency is no matter with R.L
TRP is active testing of the cell. In the generally, higer efficiency leads to higher TRP.
TIS lies on gain of antenna and N/S of the whole phone. In the generally, we hope to improve the efficiency to get the better gain and better TIS.
TRP and TIS can be measured in the anechoic chamber. As the T-mobile, vodafone,cingular requirement, TRP_FS usually should be not less than 27dBm , while the TIS_FS should achieve at least -103dBm.
[
手机开发]
添加评论 | 评论/阅读(0/2113)