级联型声表面横波滤波器
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Cascading Surface Transverse Wave Filter
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    摘要:

    该文介绍了在压电石英基片上具有一阶温度系数为0的声表面横波滤波器,制作出高频、高带外抑制窄带滤波器,并采用两只声表面横波滤波器联级后的方式,提高带外抑制性能。测试结果表明,滤波器的频率为1 219.4 MHz,损耗为9.38 dB,-1 dB带宽为0.743 MHz,-3 dB带宽为1.06 MHz,-40 dB带宽为2.94 MHz,群延时波动在偏离中心频率-100~100 kHz时的值小于100 ns,且输入、输出端驻波均小于2。

    Abstract:

    The surface transverse wave (STW) filter with zero of first order temperature coefficient on quartz substrate is introduced in this paper. The high frequency narrow band filter with high outofband rejection has been fabricated,and two STW filters are cascaded to improve the outofband rejection performance.The measurement results show that the STW filter has center frequency 〖JP2〗of 1 219.4 MHz,insertion loss of 9.38 dB,-1 dB bandwidth of 0743 MHz,-3 dB bandwidth of 1.06 MHz,-40 dB bandwidth of 2.94 MHz,the group delay ripple of less than 〖JP2〗100 ns at offset of -100~100 kHz of center frequency, and the standing wave of less than 2 both at the input and output ends.

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周卫,王岚,黎亮.级联型声表面横波滤波器[J].压电与声光,2019,41(6):841-843. ZHOU Wei, WANG Lan, LI Liang. Cascading Surface Transverse Wave Filter[J]. PIEZOELECTRICS AND ACOUSTOOPTICS

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  • 在线发布日期: 2019-12-19
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