论文部分内容阅读
声表面波残余边带滤波器(SAWVSBF)具有体积小、高可靠、毋需复杂调整、低成本等优点。为了实现陡峭的频率特性,SAWVSBF是用两个切趾加权和多条耦合器制作在YZ铌酸锂基片上,它在负载50Ω系统中的测量值为:插入损耗28dB,带内波动±0.3dB,群时延波动±40ns,矩形系数1.095,阻带抑制>40dB。实际使用中,为了保证在-10—+55℃的环境温度范围的温度稳定性,SAWVSBF还采用了恒温电路来实现温度控制。此外,对群时延波动进行了详细讨论。
SAWVSBF has the advantages of small volume, high reliability, no complicated adjustment, low cost and so on. To achieve steep frequency characteristics, SAWVSBF is fabricated on YZ lithium niobate substrates using two apodization weights and multiple couplers. The measured load in a 50Ω system is: insertion loss 28dB, in-band fluctuation ± 0.3dB , Group delay fluctuation ± 40ns, rectangle coefficient 1.095, stopband rejection> 40dB. In actual use, SAWVSBF also uses a constant temperature circuit to achieve temperature control in order to ensure temperature stability in the ambient temperature range of -10- + 55 ° C. In addition, group delay fluctuation is discussed in detail.