广播电视发展至今,大部分广播电视发射台的发射塔上已经没有空间安装大规模的阵列天线了。但是,随着广播电视业务的扩展和任务的增加,以及城市规模的不断扩大,无线电视覆盖的节目套数还在继续增加。利用现有铁塔和桅杆支持物的剩余空间,来增加天馈线,应该满足很多条件。首先体积要足够小、结构紧凑以 Since the development of radio and television, most radio and television transmitting towers have no space to install large-scale array antennas. However, with the expansion of radio and television services and the increase of tasks, as well as the continuous expansion of the city scale, the number of programs covered by wireless television continues to increase. Using the remaining space of existing tower and mast supports to add an antenna feeder, many conditions should be met. First, the size should be small enough to compact structure