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在单通带滤波器的基础上引入谐振元件上,提出了一种滤波网络,通过分析微波网络的传递函数,得到阻带具有衰减极点的双通带滤波器。通过比较单通带滤波器与双通带滤波的传输特性,可以得出衰减极点来源于谐振器的共振。设计了具有2个滤波单元的双通带滤波器,通带的品质因数分别为Q1=3.7316和Q2=9.7885.并且分析了滤波单元的个数对传输系数的影响.随着滤波单元个数的增加,传输系数的幅度在通带内震荡加剧,过渡带变得更加陡峭。这种滤波网络在实际的应用很容易实现。
On the basis of the single-pass filter, the resonant element is introduced, and a filter network is proposed. By analyzing the transfer function of the microwave network, a double passband filter with stop-band attenuation pole is obtained. By comparing the transmission characteristics of the single-pass filter and the double-pass filter, it can be concluded that the attenuation pole originates from the resonance of the resonator. A two-pass filter with two filter units is designed. The passband quality factor is Q1 = 3.7316 and Q2 = 9.7885 respectively. And the influence of the number of filter units on the transmission coefficient is analyzed. With the number of filter units Increase, the amplitude of transmission coefficient aggravates in the passband and the transitional zone becomes more steep. This filter network in the actual application is very easy to achieve.