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A broadband filter with two transmission zeros adopting a new design method

机译：具有两个传输零点的宽带滤波器采用一种新的设计方法

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摘要

A new design method was proposed in this article to insert transmission zerosin the broadband filters. In this method, the coupling line was connected to acertain position on the resonator. And then the coupling strength was adjustedby the connecting position. The open end of the resonator was hung and thenthe cross-coupling was introduced to realize transmission zeros. This couplingmethod could add an adjustable parameter to improve the freedom of designand convenient to insert the transmission zeros. To verify this method, a highlyselective coupled-line microstrip filter with two transmission zeros was designed,fabricated, and measured. The measured results were in good agreement withthe simulated ones. The return and insertion losses of the broadband filter werebetter than 18 and 2 dB, respectively. The relative bandwidth of the filter (FBW)was more than 68%. The rectangular coefficient (30 dB:1 dB) was less than 1.21.
机译：本文提出了一种在宽带滤波器中插入零传输的新设计方法。在这种方法中，将耦合线连接到谐振器上的特定位置。然后通过连接位置调整耦合强度。悬挂谐振器的开口端，然后引入交叉耦合以实现传输零位。该耦合方法可以添加可调参数，以提高设计的自由度，并方便插入变速器零位。为了验证该方法，设计，制造和测量了具有两个透射零的高选择性耦合线微带滤波器。测量结果与模拟结果吻合良好。宽带滤波器的回波损耗和插入损耗分别优于18 dB和2 dB。滤波器的相对带宽（FBW）超过68％。矩形系数（30 dB：1 dB）小于1.21。

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