Millimeter-wave (mm-wave) monolithic-microwave-integrated-circuit (MMIC) bandpass filters (BPFs) usually feature high insertion loss (IL). To this concern, an analytical method for low-loss MMIC BPFs is presented by using lumped-distributed parameters in this article. To reduce the IL, the enhanced-quality-factor resonator and low-loss coupling topology are both investigated. First, the proposed resonator and filter are realized by combining quasi-lumped elements and distributed mutual coupling. Both compact size and multiple transmission zeroes are accordingly realized. Second, a low-loss coupling topology is further introduced for MMIC filter by using mixed electric and magnetic couplings. For theoretical analysis, the lossy equivalent circuit modeling for mm-wave MMIC BPF is investigated, as well as an analytical parameter extraction. Based on the circuit analysis, a fast synthesis of low-loss mm-wave MMIC filter is presented. For demonstration, two compact MMIC BPFs are designed by using the gallium arsenide (GaAs) process. Low IL of only 0.95 dB, sharp rejection skirt of passband, and wide stopband are simultaneously obtained. The features of the proposed MMIC BPFs indicate promising applications in the fifth-generation (5G) mm-wave systems.

中文翻译：

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使用集总分布参数的低插入损耗MMIC带通滤波器，适用于5G毫米波应用

毫米波单片微波集成电路（MMIC）带通滤波器（BPF）通常具有高插入损耗（IL）。为此，本文提出了一种使用集总分布参数的低损耗MMIC BPF的分析方法。为了降低IL，研究了增强型品质因数谐振器和低损耗耦合拓扑。首先，通过组合准集总元件和分布式互耦合来实现所提出的谐振器和滤波器。相应地实现紧凑的尺寸和多个传输零。其次，通过使用混合的电耦合和磁耦合，为MMIC滤波器进一步引入了低损耗耦合拓扑。为了进行理论分析，研究了毫米波MMIC BPF的有损等效电路建模以及分析参数提取。在电路分析的基础上，提出了一种低损耗毫米波MMIC滤波器的快速合成方法。为了演示，通过使用砷化镓（GaAs）工艺设计了两个紧凑的MMIC BPF。同时获得了仅0.95 dB的低IL，通带的尖锐抑制裙和宽阻带。拟议中的MMIC BPF的功能表明在第五代（5G）毫米波系统中有望实现应用。