论文部分内容阅读
无线电波在传播过程中要受到同频率的电波干扰;不同频率的强信号谐波干扰;雷电或其它火花放电干扰;磁爆或太阳黑子活动干扰;还受电离层和地形环境影响等. 源环型天线它有较强的方向性,对微弱的传真信号进行了宽频带低噪声放大,提高了信噪比,增强了抗干扰能力,是目前通用的几种天线中较理想的一种.同时用不同的天线接受同一发射台的传真信号,用环型天线接收的传真图的清晰度,抗干扰等方面,占有明显优势.
Radio waves in the transmission process to be subject to the same frequency of radio waves; different frequencies of strong signal harmonic interference; lightning or other spark discharge interference; magnetic burst or sunspot activity interference; but also by the ionosphere and terrain environment, etc. Source ring It has a strong direction of the antenna, a weak facsimile signal wideband low-noise amplification, improve the signal to noise ratio, enhanced anti-interference ability, is currently the most ideal of several types of antennas. At the same time With a different antenna to accept the same transmitter’s fax signal, with the ring antenna to receive the clarity of the fax map, anti-interference, etc., has obvious advantages.