聲表面波濾波器進化設計:提出了一種全新的設計方法，它以聲表面波濾波器中心頻率處的插入損耗和旁瓣抑制作為尋優(yōu)目標，通過選擇、交叉和變異等遺傳操作，自動生成聲表面波濾波器的輸入和輸出叉指換能器所有指條長度，并給出中心頻率處的聲表面波濾波器頻率響應。與典型的等同期、等指長的聲表面波濾波器相比，采用進化方法設計，極大地提高了濾波器頻率響應性能，旁瓣抑制得到了改善。所作的研究具有較強的實用價值。
【關(guān)鍵詞】聲表面波濾波器；進化設計；染色體

Evolutionary Design for Surface Acoustic W ave Filter

【Abstract】A novel evolutionary design approach is proposed．Taking insertion loss in center frequency and side lobe suppression as optimizing target． 【he size of all fingers of input and output interdigital transducers can be ob—tained automatically by selection， erossover and mutation operation， as well as its frequency response can be obtained．Compared with the Surface acoustic wave filter with same period and same size of all fingers of interdigital transducers，the frequency response of that which hased on evolutionary design is improved greatl~，especially in its side lobe suppression．The result has practical prospect．
【Key words】surface acoustic wave filter；evolutionary design；chromosome