基于周期性加载慢波结构的双频Wilkinson功分器的设计  

Design of Dual-Frequency Wilkinson Divider Using Periodically Loaded Slow Wave Structure

作　　者：林俊明[1] 郑耀华[1] 张志浩[1] 章国豪 

机构地区：[1]广东工业大学信息工程学院,广州510000

出　　处：《微波学报》2016年第2期72-76,共5页Journal of Microwaves

基　　金：广东省领军人才专项资助(400130002)

摘　　要：针对传统Wilkinson功分器尺寸大且工作频率只局限于基波及其奇次谐波的问题,通过采用级联两条不同特性阻抗的周期性电容加载的传输线代替传统的1/4波长阻抗变换器,并结合RLC并联谐振网络,设计一种适用于任意两个频率的Wilkinson功分器,从而显著减小了功分器的尺寸。最后基于FR4基板,设计应用于900 MHz和1.8 GHz的双频Wilkin-son功分器。测量结果显示,功分器的三端口电路匹配良好,在900 MHz,S11约为-25 d B,S22约为-26 d B,S21约为-3.23 d B;在1.8 GHz,S11约为-23 d B,S22约为-17.5 d B,S21约为-3.39 d B;在两个频点下,输出端口的隔离度分别为-27 d B和-23 d B,仿真结果和测量结果吻合,验证了该方法的可行性和实用性。Aiming at the drawback that a conventional Wilkinson power divider occupies more space and operates only at onedesign frequency and at all of its odd harmonics,a Wilkinson power divider operating at two arbitrary different frequencies is presentedby combining a parallel RLC resonant network and a quarter wavelength impedance transformer which is consist of two different charac-teristic impedance transmission-lines. The miniaturization is achieved by realizing the power divider＇s impedance transformers usingslow wave structures which are designed by periodically loading transmission lines with capacitances. For dual-band application,we se-lected two bands at 900 and 1800 MHz. The substrate used was FR4 with a dielectric constant of 4.6. According to the simulated andmeasured results,three ports of the divider meet a good matching with the S11-25 d B,S22-26 d B,S21-3.23 d B at 900 MHz and S11-23 d B,S22-17.5 d B and S21-3.39 d B at 1800 MHz,which verifies the usability of the method.

关 键 词：威尔金森 双频 功分器 周期性加载慢波结构 

分 类 号：TN626[电子电信—电路与系统]