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玩对讲机你了解定向天线吗? 泉州对讲机品牌

定向天线是指在某一个或某几个特定方向上发射及接收电磁波特别强,而在其他的方向上发射及接收电磁波则为零或极小的一种天线。采用定向发射天线的目的是增加辐射功率的有效利用率,增加保密性;采用定向接收天线的主要目的是增强信号强度增加抗干扰能力。鉴于昨天有微信“shuziduijiangji”粉丝提到定向天线,今天小编就和你聊聊定向天线:

 泉州对讲机品牌

应用特点

定向天线常用于覆盖比较长的街道,并有以下优点:

1、具有较大的前向增益

2、能?#31181;?#21518;向信号,当该小区会对它后面的小区造成潜在的干扰?#20445;?#36825;种特性非常有用。

另外值得一提的是定向天线可以改善微蜂窝覆盖范围内某些建筑物的室内覆盖。

泉州对讲机品牌

定向天线,在水平方向图上表现为一定角度范围辐射,也就是平常所说的有方向性。同全向天线一样,波瓣宽度越小,增益越大。定向天线在通信系统中一般应用于通信距离远,覆盖范围小,目标密度大,频率利用率高的环境。

我们也可以这样子来思考全向天线和定向天线之间的关系:全向天线会向四面八方发射信号,前后左右都可以接受到信号,定向天线就好像在天线后面罩一个碗状的反射面,信号只能向前面传递,射向后面的信号?#29615;?#23556;面挡住并反射到前方,加强了前面的信号强度。下图为定向天线的信号辐射图。

 

定向天线的主要辐射范围像个倒立的不太完整的圆锥。

定向天线的安装

对于室外天线,天线与无线AP之间需要增加防雷设备;定向天线要注意天线的正面朝向远端站点的方向;天线应该安装在尽可能高的位置,天线和站点之间尽可能满足视距(肉眼可见,中间避开障碍)。

定向天线的参数  泉州对讲机品牌

 

? 七乐彩17067
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