A wideband and compact rat‐race coupler that covers 3 to 5 GHz is proposed for the fifth‐generation new radio N77/N78/N79 applications. The wideband characteristic is obtained by using cascaded two‐section topology and broadside‐coupled lines at each input/output port. Miniaturization of two‐section rings is achieved using meander microstrip lines. A fractional bandwidth of 50% and a size reduction of 60% are both reached. Good in‐phase and out‐of‐phase characteristics are obtained as well. The circuit can be easily fabricated using conventional printed circuit board process and suitable for mass production.

中文翻译：

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适用于第五代N77 / N78 / N79应用的宽带紧凑型鼠种族耦合器

对于第五代新型无线电N77 / N78 / N79应用，提出了一种覆盖3至5 GHz的宽带紧凑型鼠种族耦合器。宽带特性是通过在每个输入/输出端口使用级联的两部分式拓扑和宽带耦合线获得的。使用弯曲的微带线可以实现两节环的小型化。两者都达到了50％的小带宽和60％的尺寸减小。也可以获得良好的同相和异相特性。该电路可使用常规印刷电路板工艺轻松制造，并且适合批量生产。