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在热带丛林中,由于林木的吸收与地形的影响,给小功率电台的通信带来很大困难。本文叙述了利用树作为天线辐射体的一部分,即将短天线的顶端与树体连接并称之为“斜接树天线”。在短波波段低端(2～7兆赫)当收发双方均采用此天线时,较之同等长度(与电台至树接点间连接的导线长度相同)的鞭天线可使接收机输出的信号电平提高15至20分贝。本文对这一天线的性能作了基本分析与介绍了测试数据,最后对使用这一天线的某些问题,诸如树的选择,接点高度的选择进行了研究。
In the tropical jungle, the communication of low-power radio stations presents great difficulties due to the absorption of the trees and the impact of the terrain. This paper describes the use of trees as part of an antenna radiator that connects the top of a short antenna to the tree and calls it a “miter tree antenna.” At the lower end of the shortwave band (2 to 7 MHz), whip antennas with the same length (the same length as the wire connecting the radio to the tree node) increase the signal level at the receiver output when both transmit and receive antennas are used 15 to 20 dB. This paper gives a basic analysis of the performance of this antenna and introduces the test data. Finally, some problems about the use of this antenna, such as the choice of tree and the choice of contact height, are studied.