ABSTRACT In this paper, a compact two-section half-wave balun using artificial transmission lines is proposed. This paper describes design rules that need to be satisfied for a two-section half-wave balun by the even- and odd-mode analysis. According to the design rules, a two-section half-wave balun using microstrip lines is designed and simulated. Then, to reduce dimensions, conventional quarter-wavelength microstrip transmission lines are replaced by artificial transmission lines realized by a series of meandered-line inductors, parallel-plate capactiors, and interdigital capacitors. Additionally, the improved artificial transmission lines with chip capacitors have realized lines with very low characteristic impedance that cannot be easily achieved by conventional transmission lines. Based on these theories, a two-section half-wave balun using artificial transmission lines has been designed and fabricated. The developed balun occupies 25.1 mm × 20.2 mm, which almost equals to 5.0% of this topology of balun adopting conventional microstrip transmission lines. The simulated and measured results demonstrate good agreements between them, which verifies feasibility of the proposed designing method.

中文翻译：

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基于人工传输线的紧凑型二段式半波巴伦分析与实现

摘要 在本文中，提出了一种使用人工传输线的紧凑型两节半波巴伦。本文通过偶模和奇模分析描述了两段式半波巴伦需要满足的设计规则。根据设计规则，设计并仿真了一个使用微带线的两段半波巴伦。然后，为了减小尺寸，传统的四分之一波长微带传输线被由一系列曲折线电感器、平行板电容器和叉指电容器实现的人工传输线所取代。此外，经过改进的带有片状电容器的人工传输线实现了传统传输线无法轻易实现的极低特性阻抗的线路。基于这些理论，已经设计并制造了使用人工传输线的两段半波巴伦。所开发的巴伦占地25.1 mm × 20.2 mm，几乎相当于采用传统微带传输线的巴伦拓扑结构的5.0%。仿真和实测结果表明它们之间具有良好的一致性，验证了所提出的设计方法的可行性。