This article reports on the design and practical development of RF co-designed MMIC components that exhibit the function of a bandpass filter and an RF isolator. They are based on cascaded non-reciprocal frequency-selective stages (NFSs), one-pole/two-transmission zero (TZ) multi-resonant stages, and impedance inverters. The combination of these components results in a two-port network that exhibits a nonreciprocal quasi-elliptic bandpass filter (NBPF) response in the forward direction and full RF signal cancellation in the reverse one. The operating principles of the NBPF are presented through various circuit-based design examples of low- and high-order configurations. For proof-of-concept demonstration purposes, NBPF prototypes were designed on an MMIC GaAs process and were experimentally validated at $X$ -band. They include a two-pole/two-TZ NBPF and a three-pole/four-TZ NBPF.

中文翻译：

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X-带准椭圆非互易带通滤波器 (NBPF)

本文报告了射频协同设计的 MMIC 组件的设计和实际开发，这些组件具有带通滤波器和射频隔离器的功能。它们基于级联非互易频率选择级 (NFS)、一极/两传输零 (TZ) 多谐振级和阻抗逆变器。这些组件的组合形成了一个双端口网络，该网络在正向呈现非互易准椭圆带通滤波器 (NBPF) 响应，在反向呈现完全射频信号消除。通过低阶和高阶配置的各种基于电路的设计示例，介绍了 NBPF 的工作原理。出于概念验证演示目的，NBPF 原型是在 MMIC GaAs 工艺上设计的，并在 $X$ -乐队。它们包括一个两极/两 TZ NBPF 和一个三极/四 TZ NBPF。