甚高频/超高频广播天线前方的理论和实测功率密度。

Theoretical and measured power density in front of VHF/UHF broadcasting antennas.

作者信息

Jokela K

机构信息

Finnish Centre for Radiation and Nuclear Safety, Helsinki, Finland.

出版信息

Health Phys. 1988 May;54(5):533-43. doi: 10.1097/00004032-198805000-00005.

DOI:10.1097/00004032-198805000-00005

PMID:3360606

Abstract

A simple and easy-to-use model based on more rigorous computations was formulated for the prediction of power density levels in front of dipole array-type VHF (very high frequency) and UHF (ultra high frequency) broadcasting antennas. Measurements on site verified the usefulness of the model. The distance at which the power density begins to exceed 10 W.m-2--the value established by standards as a limit--is roughly 40 m for UHF-TV antennas, 30 m for FM (frequency modulated) radio antennas and 15 m for VHF-TV antennas. Typical average input powers of antennas are 20 kW, 4 kW and 10 kW for FM radio, VHF-TV and UHF transmissions, respectively.

摘要

为预测偶极子阵列型甚高频（VHF）和超高频（UHF）广播天线前方的功率密度水平，构建了一个基于更严格计算的简单易用模型。现场测量验证了该模型的实用性。功率密度开始超过10 W·m⁻²（该值由标准设定为限值）时的距离，对于UHF电视天线约为40米，对于调频（FM）广播天线约为30米，对于VHF电视天线约为15米。调频广播、VHF电视和UHF传输的天线典型平均输入功率分别为20千瓦、4千瓦和10千瓦。