3 dB和10 dB带宽法测量天线增益的误差分析

Error Analysis on Antenna Gain Measurement with 3 dB and 10 dB Bandwidth Method

卫星通信就是地球上的无线电通信站之间利用人造卫星作中继站而进行的通信。卫星通信线路的设计或分析一定涉及到天线增益。天线增益是天线的一个重要性能指标,天线增益越高,则发射机所需输出功率越小。卫星通信天线的增益测量方法很多,各有其优缺点。着重研究了用3dB和10dB带宽法测量时,影响测量精度的各种可能的影响因素及其影响程度,在此基础上提出了一些改良的方法和措施。

Satellite communication is the communication between wireless signal stations with artificial satellite as relay station. Circuitry design and analysis must involve antenna gain in satellite communications. Antenna gain is an important specification of performance. The higher the antenna gain is, the lower the required power of the transmitter is. There are many methods to measure antenna gain of satellite communications.These methods have beth advantages and disadvantages. This paper studies the various possible factors that influence the measuring accuracy and the degree of influence when measuring antenna gain with 3 dB and 10 dB bandwidth method. Further more, the paper proposes many methods to improve the measuring accuracy.