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Miniaturized dual-band filter with return loss bandwidth and transmission zero control

机译:具有回波损耗带宽和传输零控制的小型化双频带滤波器

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摘要

In this paper, a compact dual-band bandpass filter (DB-BPF) using new dual-mode resonator-loaded resonators (DM-RLRs) is presented and investigated to simultaneously achieve controllable return loss (RL), bandwidth (BW) and transmission zeros (TZs), and the simple strategy for this type of filter design is proposed. The DB-BPF consists of two high-flexibility DM-RLRs with separated electric and magnetic coupling (SEMC). Specifically, the proposed DM-RLR provides the DB-BPF with center frequency control as well as RL control, and SEMC is utilized for the BW and TZ control. To facilitate the design, a simple optimization-based design strategy is proposed and employed, resulting in an example layout. Finally, the example filter, with center frequencies of 1.57GHz (channel 1 for GPS) and 3.5GHz (channel 2 for WiMAX), is fabricated and measured. The measurement insertion loss and RL are 0.9/0.9 and 17/20dB. The fabricated DB-BPF also exhibits a compact size of 0.12(g)x0.08(g) at 1.57GHz.
机译:本文提出并研究了使用新型双模谐振器加载谐振器(DM-RLR)的紧凑型双带通滤波器(DB-BPF),以同时实现可控制的回波损耗(RL),带宽(BW)和传输零(TZ),并提出了用于这种类型的滤波器设计的简单策略。 DB-BPF由两个具有分离的电耦合和磁耦合(SEMC)的高灵活性DM-RLR组成。具体而言,提出的DM-RLR为DB-BPF提供中心频率控制和RL控制,而SEMC用于BW和TZ控制。为了简化设计,提出并采用了一种基于优化的简单设计策略,从而产生了示例布局。最后,制造并测量了示例滤波器,其中心频率为1.57GHz(GPS的通道1)和3.5GHz(WiMAX的通道2)。测量插入损耗和RL为0.9 / 0.9和17 / 20dB。所制造的DB-BPF在1.57GHz时还具有0.12(g)x0.08(g)的紧凑尺寸。

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