1.6～30MHz电调滤波器的设计与实现

Design and Implementation of 1.6 ～ 30 MHz Electrically Tunable Filter

基于短波通信系统数字化、小型化需求,提出了1.6~30 MHz电调带通滤波器的设计与实现方法。该滤波器采用双极点调谐滤波,变容管并联谐振,用电感进行耦合的线路技术,实现了外部电压控制（电调谐）滤波器频率的要求。采用将滤波器按频率分段设计,波段开关控制信号输入输出,实现了滤波器宽频率范围同步调谐的目的。同时,各分段滤波器设计集成在一块印制板上,滤波器整个体积仅有40 mm×30 mm×8 mm。仿真结果表明,电调滤波器控制简单、调谐方便,性能指标优良,其设计方法可行。对设计完成的实验品进行测试,结果与仿真相吻合,同时进一步验证了数字控制的多样与灵活性。

Based on the requirement of HF communication system digitalization and miniaturization,a feasible design and implementation method of 1. 6 ~ 30 MHz electrically tunable band-pass filter is presented. The filter uses the inductively coupled circuit technique,employing the two-pole varactor diode parallel resonance to meet the requirement of external voltage frequency control. To achieve synchronous tuning in a wide frequency range,the filter adopts a segmented design based on frequency bands,and the band switch controls the in / output signals. Simultaneously,the segmented filter is integrated into a printed circuit board with a size of only 40 mm ×30 mm × 8 mm. The simulation results show that the electrically tunable filter has the advantages of easy control,convenient tuning and excellent performance,and the design method is feasible. The test result is consistent with the simulation data,which further verifies the diversity and flexibility of digital control.