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本文概括地介绍了今午我所研制的中心频率分别为33兆赫、70兆赫、100兆赫,相对带宽(3分贝)为17%,通带波纹≤±0.2—±0.4分贝,旁瓣抑制≥40—44分贝的声表面波滤波器之设计原理、结构和测试结果。在该器件中,采用了某些二次效应的抑制补偿技术。对于实验中的某些问题,作了不成熟的解释。最后根据我们的体会提出,采用辛克函数加权、凯塞尔窗口,只要抑制或补偿基片边缘反射、三重渡越回波、电磁直通信号、体波寄生信号,就不难制出通带波纹≤±0.2分贝,旁瓣抑制≥44分贝的声表面波滤波器。
This article summarizes what I developed this afternoon, with center frequencies of 33 MHz, 70 MHz, 100 MHz, 17% relative bandwidth (3 dB), passband ripple ≤ ± 0.2- ± 0.4 dB, side lobe suppression ≥ 40 -44 dB SAW filter design principles, structure and test results. In the device, the use of some secondary effects of the suppression of compensation. For some of the problems in the experiment, made an immature explanation. Finally, according to our experience, using the Sinc function weighting, Kessel window, as long as the edge of the substrate to suppress or compensate for reflections, triple crossing the echo, electromagnetic through signal, body wave parasitic signals, it is not difficult to produce the passband ripple ≤ ± 0.2 dB, sidelobe suppression ≥ 44 dB SAW filter.