基于半波长槽线的宽带带通滤波器设计

Design of Wideband Band-Pass Filter Based on Half-Wavelength Slotline

提出了一种基于半波长槽线的宽带带通滤波器的设计方案。首先给出该种滤波器的物理结构和对应的等效传输线模型;其次依据电路模型进行理论分析,从预先确定的电路响应特性推导出带通滤波器的电参数;最后通过建立电磁仿真和电路板制作验证方案的可行性。采用以上方法设计了一个中心频率为3GHz、频带宽为100%的宽带带通滤波器。传输线模型、电磁仿真与实物测量结果表明:该方案准确快速,可显著缩短滤波器的设计周期,并实现滤波器的宽带宽和低插入损耗特性。

A novel wideband band-pass filters based on 1/2 wavelength slotline is proposed in this paper.The wideband filter structure and the corresponding equivalent transmission line model are given in this design scheme.The equivalent circuit analysis reveals that the electrical and then geometric parameters of the filter structure can be obtained by theoretical calculation under the specific filter response conditions.The feasibility of the scheme is well verified by the EM simulation and measurements of the fabricated exemplary filter using the proposed structure and design method.A broadband band-pass filter with a center frequency of 3GHz and a bandwidth of 100%is designed by using the above method.The results of electromagnetic simulation and physical measurement indicate that the scheme is accurate and fast,and the design cycle of the filter can be shortened significantly while achieving the wide bandwidth and low insertion loss characteristics of the filter.