论文部分内容阅读
(上接第 0 2期 )4 接收天线的技术参数电视接收天线的性能是影响有线电视系统中接收无线电视质量的一个重要因素。下面介绍评价天线质量的主要技术参数。4 .1 输入阻抗天线与馈线相连的两个端点称为天线的输入端。天线输入端上的信号感应电压与电流之比为天线的输入阻抗。当?
(Continued on 02) 4 Technical parameters of the receiving antenna The performance of the television receiving antenna is an important factor affecting the quality of receiving wireless television in a cable television system. The following describes the main technical parameters to evaluate the quality of the antenna. 4.1 Input impedance Antenna The two endpoints connected to the feeder are called the input of the antenna. The ratio of the signal induced voltage to current at the antenna input is the antenna input impedance. when?