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A new weighting method,transducer weighting.for the uniform groove-deph RAC is proposed in thispaper.The weighted input and output transducersform a weighting transversal filter In addition,the groove-width weighting,which can be used as an auxiliary is also discussed. By using the new methods,two uniform groove depth RACs have been designed and fabricated,Thesidelobe suppressions achieved are 31 dB and 32 dB.respectively.The results are considered satisfactorybecause the phase compensation by metal strip was not applied. 相似文献
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In this paper,an improved design approach for the double dispersive SAW pulse compressionfilters is given.Based on the computer simulation of the filter performances,by modifying the weightedenvelopes of the filter finger lengths,the approximate design formulas have been obtained. Usingthese formulas,three sorts of samples of the pulse compression filters are designed and fabricated.The experimental results indicate that the sidelobe level have achieved up to-37dB in the best situation. 相似文献
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声表面波脉冲压缩滤波器是脉冲压缩体制雷达中的关键部件,它由压电基片上刻蚀两列叉指金属电极构成,有单色散和双色散两种结构。滤波器的主瓣电平与旁瓣电平的比(简称主副瓣比)是此类器件的一个关键技术指标。 我们曾对双色散声表面波脉冲压缩滤波器作了一些研究。在此基础上我们进一步提高了主副瓣比。结果如下: 相似文献
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