采用三节六晶体宽带差接桥型电路,设计和研制出了一种用于通讯系统进行较宽范围选频的中高频宽带型带通分立式压电石英晶体滤波器新产品.该产品在中心频率为70 MHz时达到130 MHz以上的通带宽度,相对带宽达到1.8‰.本设计实现了70 MHz中高频基频滤波晶体半成品的设计、130 MHz通带范围内波动的调平及滤波器的插损、阻带宽度、阻带衰减等技术指标.
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