一种基于PCB加工技术的毫米波Marchand巴伦

A Millimeter Wave Marchand Balun Based on PCB Processing Technology

巴伦作为差分到单端信号转换的关键组件,在高速电路实现中得到了广泛研究与应用。但目前对于毫米波频段的巴伦研究甚少,特别是基于PCB加工工艺的高频巴伦。针对该应用,提出了一款适用于毫米波频段的平面Marchand巴伦。所设计的微带巴伦的最小线宽和缝隙宽度均大于0.12 mm,满足PCB加工工艺要求。仿真结果表明,该巴伦工作带宽为21.9%,差分端的最大幅度和相位失配分别小于1.1 d B和6°。为进行试验验证,在RO4350基板上集成了巴伦以及用于测试的耦合微带线—矩形波导转换结构。测试与仿真结果基本一致,证明了所提出的巴伦具有良好的性能。

As a key component for differential-to-single-ended conversion,Balun has been widely studied and applied in high-speed circuits.However,there are few researches on balun for millimeter-wave application,especially balun based on PCB processing technology.For millimeter-wave application,a planar Marchand balun is proposed.The minimum microstrip line-width and slot-width of the balun are both larger than 0.12 mm to meet the requirement of the PCB processing technology.The simulation results show that the working bandwidth is 21.9%,and the maximum mismatches of amplitude and phase are smaller than 1.1 dB and 6°respectively.For experimental verification,the proposed balun and the conversion structure for coupled microstrip lines to rectangular waveguide are integrated on a Rogers 4350 substrate.Good coincidence between the simulated and measured responses of the balun is demonstrated,indicating the validity of the design scheme.