高阻带抑制有源声表面波滤波组件

An Active SAW Filter Module with High Stopband Rejection

介绍有源声表面波滤波组件的设计思路。报道最新研制的高性能滤波组件，其中心频率４０ＭＨｚ，３ｄＢ相对带宽０．８％，阻带抑制优于１００ｄＢ，矩形系数（Δｆ１００ｄＢ／Δｆ３ｄＢ）小于３，输入输出端口电压驻波比接近１。组件体积８５ｍｍ×３５ｍｍ×２４ｍｍ。

The design consideration for active SAW filter module is presented.A SAW filter module with high performances has been developed recently.Its centre frequency is of 40 MHz with relative bandwidth of 0.8% at 3 dB, stopband rejection in excess of 100 dB,rectangular factor( Δf 100 dB / Δf 3 dB )is less than 3,voltage standing wave ratio is near 1 at input and output terminals.The measure of the filter module is 85 mm × 35 mm × 24 mm, weight is less than 115 grams.