A novel planar elliptic function lowpass filter (LPF) based on substrate integrated suspended line technology is developed and investigated. Transformed radial stub, stepped‐impedance resonators, and open stubs are cascaded to obtain sharp roll‐off and wide stopband. The proposed LPF produces six transmission zeros in the stopband, and the mechanism of the transmission zeros is studied. Both the simulation and measurement are conducted to verify the performance of the proposed filter, and good agreement between the simulated and measured results is observed. The filter shows attractive characteristics such as low insertion loss<0.6 dB, high return loss of 20 dB, wide stopband from 3.85 to 24 GHz with −20 dB attenuation level and a small area of 0.20 λ_g × 0.14 λ_g, where λ_g is the waveguide length at the cutoff frequency.

中文翻译：

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基于衬底集成悬浮线技术的变换径向短截线宽阻带低通滤波器设计

研制并研究了一种基于衬底集成悬浮线技术的平面椭圆函数低通滤波器（LPF）。变换后的径向短截线，步进阻抗谐振器和开放短截线被级联以获得急剧的滚降和较宽的阻带。提出的低通滤波器在阻带中产生六个传输零，并研究了传输零的机理。进行仿真和测量以验证所提出的滤波器的性能，并且观察到仿真结果与测量结果之间的良好一致性。该过滤器显示了有吸引力的特性，例如低插入损耗<0.6分贝，20dB的高回波损耗，宽的阻带从3.85至24 GHz的-20 dB的衰减水平和0.20小面积 λ_克 ×0.14  λ_克其中λ_克是在截止频率处的波导的长度。