Proposed in this manuscript is a broadband bandpass filter (BPF) with dual in-band transmission zeros (TZs) and elongated stopband for application in ultra-wideband (UWB) networks. The basic structure is developed on the principle of broadside coupling of microstrip-to-coplanar waveguide (CPW). Semi-elliptical microstrips on the top are arranged in back-to-back manner and coupled to the open circuited CPW in the ground. The basic BPF is of 3rd order with good insertion/return loss. To this basic BPF structure multiple defected ground structures (DGS) in the shape of complimentary split ring resonator (CSRR) are appended to place dual Tzs within the passband and later dumbbell-shaped DGS are engraved in the CPW to widen the stopband. Also, an approximate equivalent lumped element circuit model is developed and its frequency characteristics matched against full-wave EM simulation. The proposed dual notched BPF is finally fabricated and is found to occupy a compact area of 13.6 × 6.75 mm².

本手稿提出了一种具有双带内传输零点 (TZ) 和延长阻带的宽带带通滤波器 (BPF)，适用于超宽带 (UWB) 网络。基本结构是根据微带与共面波导（CPW）的宽边耦合原理开发的。顶部的半椭圆形微带线以背靠背的方式排列并耦合到地面的开路共面波导。基本 BPF 为三阶，具有良好的插入/回波损耗。在此基本 BPF 结构上附加了多个互补开环谐振器 (CSRR) 形状的缺陷接地结构 (DGS)，以将双 Tz 放置在通带内，随后在 CPW 中雕刻哑铃形 DGS 以加宽阻带。还，开发了近似等效集总元件电路模型，其频率特性与全波电磁仿真相匹配。所提出的双切口 BPF 最终被制造出来，并且占据了 13.6 × 6.75 mm 的紧凑面积² .