电视发射台分米波天线的改造  

Transformation of Decimeter Wave Antenna in TV Transmitting Station

作　　者：沈如良 

机构地区：[1]贵州广播电视台,贵州550002

出　　处：《广播与电视技术》2017年第9期109-112,共4页Radio & TV Broadcast Engineering

摘　　要：四偶极子阵列天线是分米波常用的电视发射天线,但大截面塔桅不能满足单一极化(水平或垂直)分米波四偶极子阵列天线的安装条件。为了解决这一难题,在大截面塔桅安装分米波四偶极子阵列天线时,阵列天线单元采用±45°斜极化,并采用电气下倾技术与零点填充技术,使天线系统具有良好的水平面辐射场形和垂直面辐射场形,在水平面和垂直方向都有良好的信号强度,能同时满足移动和固定接收。Four-dipole array antenna is always used in UHF television. A large cross-section tower mast cannot install a single polarization （horizontal or vertical ） decimeter wave four-dipole array antenna. In this paper, we install the decimeter wave four-dipole array antenna on a large-tan- dem tower mast, with ±45° oblique polarization, using electrical downtilt and zero filling technology. Therefore the antenna system has a good horizontal radiation field, as well as a good vertical radiation field. With good signal strength in horizontal and vertical directions, it could receive signals both in the moving and in the fixed.

关 键 词：辐射场形 极化方式 主波束下倾 零点填充 

分 类 号：TN934[电子电信—信号与信息处理]