基于Π型交指结构的星载微带电路小型化设计  

A Novel Design of Miniaturized Spaceborne Microstrip Circuits Using Π-Type Interdigital Circuit

作　　者：李斌 王毅 赵慧敏 王国瑾 于长龙 LI Bin;WANG Yi;ZHAO Hui-min;WANG Guo-jin;YU Chang-long(Academy of Space Electronic Information Technology,Xi＇an 710100,China)

机构地区：[1]空间电子信息技术研究院

出　　处：《微波学报》2018年第5期44-48,共5页Journal of Microwaves

摘　　要：现有星载微波系统中大量使用了各种形式的微带电路,但由于微带电路在低频率时尺寸较大,不利于星载产品小型化,因此提出了一种基于交指结构的微带电路小型化设计方法。该方法采用两个交指电容和高特征阻抗微带线构造的π型结构替代原有微带结构,从而减小微带电路尺寸。对该方法进行分析并给出了设计理论,进行了仿真及实测验证,并成功应用到多种不同形式的微带电路中。最后给出了两个已验证的实例,一个基于FR4材料的2.4 GHz功分器和一个基于RO4003C的1.4 GHz耦合器。该设计方法可以在不改变电性能的基础上减少微带电路约40%的面积。Nowadays,more and more microstrip circuits are applied in spaceborne microwave systems. The disadvantage of microstrip circuits working at low frequency is too large for spaceborne applying. To overcome it,a design method by using interdigital circuit is proposed,which includes a π-type structure consists of two interdigital capacitors and a high characteristic impedance line. The design theory is explained using an equivalent circuit model,and the equation of the theory is presented in details. One 2.4 GHz Wilkinson divider based on FR4 substrate and one 1.4 GHz branch coupler based on RO4003 C substrate using the interdigital circuit are simulated,fabricated and measured. The results show that a size reduction of about 40% is achieved with good performance.

关 键 词：星载微带电路 交指结构 小型化 

分 类 号：V443[航空宇航科学与技术—飞行器设计]