Herein, we present a compact transversal bandpass filter (BPF) with an extremely wide upper stopband and multiple transmission zeros (TZ). Three signal transmission paths with shorted stubs and open‐coupled lines allow signal transmission from input port to output port. Two resonant modes can be excited simultaneously and managed easily for bandpass response. Eleven TZs are achieved via transmission path cancelation; an extremely wide upper stopband with an attenuation level better than –12 dB is achieved up to 11.7 f₀, where f₀ is the center frequency (CF). In addition, bandwidth and CF can be controlled by adjusting electrical lengths. For proof of concept, a wideband BPF centered at 1.04 GHz with 3 dB fractional bandwidths of 49.2% was designed, fabricated, and evaluated. The overall circuit measures 0.045λ_g × 0.117λ_g; good agreement was observed between the measured and simulated results.

中文翻译：

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具有宽阻带和多个传输零点的横向宽带带通滤波器

本文中，我们介绍了一个紧凑的横向带通滤波器（BPF），它具有极宽的上阻带和多个传输零点（TZ）。三个具有短截线和开放耦合线的信号传输路径允许信号从输入端口传输到输出端口。可以同时激发两个谐振模式，并且可以轻松管理带通响应。通过取消传输路径可以实现11个TZ；达到11.7 f _0时，可获得一个衰减范围优于–12 dB的极宽的上阻带，其中f ₀是中心频率（CF）。另外，带宽和CF可以通过调整电气长度来控制。为了进行概念验证，设计，制造和评估了以1.04 GHz为中心的宽带BPF，3 dB的分带宽为49.2％。整个电路的措施0.045 λ_克 ×0.117 λ_克; 在测量结果和模拟结果之间观察到良好的一致性。