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本文提出一种全方向全频道收音电视有源接收天线的设计实例。在天线设计方法中采用有源技术把天线的工作频带展宽到0.1～900MHz,并使整个天线趋向小型化。在天线设计时,采用组合型印刷天线阵作为UHF全向天线,采用兼用型局部折合振子作为VHF频段的全向天线,并采用有源技术展宽天线的阻抗带宽和提供必要的增益。在长、中、短波收音天线中,将直立电小天线作为有源放大器的输入回路,网络形式用互补推挽放大电路,以便得到线性优良、工作动态范围大的接收性能。在天线的结构中采用印刷电路技术,将部分变换器、天线振子、移相器直接制作在印制板上。整个天线性能稳定,体积小巧,便于加工生产。该全向天线适宜在各种移动场合下接收无线电广播和电视节目,尤其适合于小型船只在各种场强条件下接收信号用。当该天线配上宽带分支分配器后能构成收音、电视共用天线接收系统。该天线的组合形式
This paper presents an omni-directional all-channel radio and television active receiving antenna design examples. In the antenna design method, active technology is used to broaden the working frequency band of the antenna to 0.1-900 MHz and make the entire antenna tend to be miniaturized. In the antenna design, a combined printed antenna array is used as a UHF omnidirectional antenna, a dual-purpose partially folded oscillator is used as an omnidirectional antenna in the VHF band, and active technologies are used to broaden the impedance bandwidth of the antenna and provide the necessary gain. In the long, medium and shortwave radio antennae, the small vertical elec- trical antenna is used as the input circuit of the active amplifier, and the network form is complemented with a push-pull amplifier circuit so as to obtain the receiving performance with excellent linearity and large working dynamic range. The use of printed circuit technology in the structure of the antenna, the part of the converter, antenna oscillator, phase shifter directly on the printed circuit board. The entire antenna is stable, small size, easy processing. The omnidirectional antenna is suitable for receiving radio and television programs in a variety of mobile situations and is particularly suitable for small vessels to receive signals under various field conditions. When the antenna coupled with broadband branch splitter can constitute a radio, TV antenna receiving system. The combination of the antenna