A novel high-performance wideband balanced bandpass filter based on transversal signal-interference techniques is proposed in this article. Two signal-propagation paths consisted of coupled lines structure are used to realize two transmission zeros for the differential mode passband. Folding coupled lines are used to reduce the size of the balanced filter, and the source–load cross-coupling lines can generate additional transmission zeros to suppress the common mode signal. To validate the design, a prototype with center frequency at 2.2 GHz for long-term evolution (LTE)-band with 3-dB fractional bandwidths of 65.4% for the differential mode is designed and fabricated.

中文翻译：

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基于横向信号干扰技术的高性能宽带平衡带通滤波器

本文提出了一种基于横向信号干扰技术的新型高性能宽带平衡带通滤波器。由耦合线结构组成的两条信号传播路径用于实现差模通带的两个传输零点。折叠耦合线用于减小平衡滤波器的尺寸，源-负载交叉耦合线可以产生额外的传输零点来抑制共模信号。为了验证设计，我们设计并制造了一个原型，其中心频率为 2.2 GHz，用于长期演进 (LTE) 频带，3-dB 分数带宽为 65.4% 的差模。