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目前,已把对天线元加阻抗负载的技术应用于便携式甚高频通信设备的天线系统;本文用简短的理论分析与一些实验结果来说明这种技术的实际应用。甚至当天线元非常短时,对天线元加阻抗负载可以改变策动点阻抗,使易于匹配,还可增加天线元的有效长度,从而增加加载天线系统的增益。作为一个实例,我们把一个加电感负载的天线系统应用于34—54兆赫频段的便携式通信设备,并观察到约增加5分贝的相对增益。
At present, the technique of applying an impedance load to the antenna element has been applied to an antenna system of a portable VHF communication device. In this paper, a brief theoretical analysis and some experimental results are used to illustrate the practical application of this technique. Even when the antenna elements are very short, adding an impedance load to the antenna elements can change the touch point impedance, making it easy to match and increasing the effective length of the antenna elements, increasing the gain of the loaded antenna system. As an example, we applied an antenna system with inductive load to a portable communication device in the 34-54 MHz band and observed an increase of approximately 5 dB relative gain.