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无源滤波器设计求救

我现在用filtersolution设计一个低通滤波器你,用Tina仿真,仿真出来3DB截止频率大约为1.6M,但我实际焊出来,用信号源输入信号,逐渐增大频率,发现3dB截止频率只有0.1M,之前设计好几个都是这样,实际焊出来和仿真相差极大,请问这是为什么?设计这种无源滤波器时有什么需要特别注意的?