针对小型化双通带声表面波(SAW)滤波器的需求背景,对两端口、两通带的SAW滤波器的设计技术展开研究。通过搭建包含两组耦合模(COM)参数的双通带SAW滤波器声电协同仿真平台,分析优化滤波器性能,成功研制出CSP2520封装的双通带SAW滤波器, 其中心频率分别为1 995 MHz和2 185 MHz, 通带带宽均为40 MHz, 插入损耗小于3 dB, 通带间隔离度大于30 dB。测试与仿真结果基本一致。

In view of the demand of the miniaturized dual band SAW filter, the design technology of SAW filter with two ports and two passbands is studied. By building a dual band SAW filter acoustic-electric co-simulation platform including two groups of coupled mode (COM) parameters, the performance of the filter is analyzed and optimized. A dual-passband SAW filter packaged in CSP2520 has been successfully developed. The center frequency of the filter is 1 995 MHz and 2 185 MHz respectively, the passband bandwidths are both 40 MHz, the insertion loss is less than 3 dB, and the isolation between passbands is greater than 30 dB. The test results are consistent with that of the simulation.