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一、引言天线的几何形状尺寸和频率决定了天线的等效电性能的参数。便携式车载式短波电台通常都选用容性天线。天线回路调谐的目的,就是调整天线电流达最大值并将谐波电流分量抑制到最小。也就是说,对于发射天线,要求送到远区的有用电磁场的场强为最强。对于接收天线,要求收集到的外界有用电磁场功率为最大。我们是对发射天线回路进行自动调谐的。收信时,天线回路自动匹配谐振。天线调谐回路的形式如图1所示。
I. INTRODUCTION The geometrical shape and frequency of the antenna determine the parameters of the equivalent electrical performance of the antenna. Portable car-mounted shortwave radios usually use capacitive antennas. The purpose of antenna loop tuning, is to adjust the maximum antenna current and harmonic current component to a minimum. In other words, for the transmitting antenna, the field strength of the useful electromagnetic field sent to the far area is the strongest. For the receiving antenna, it is required to collect the useful electromagnetic field outside the maximum power. We are tuned to the transmit antenna loop automatically. When receiving, the antenna loop automatically matches the resonance. Antenna tuning circuit in the form shown in Figure 1.