基于新型耦合线隔离网络的紧凑型宽带滤波功分器设计  

Design of compact broadband filtering power divider based on new coupled-line isolation network

作　　者：黄骏 王雪道 戚涵瑞 Huang Jun;Wang Xuedao;Qi Hanrui(Jinling Institute of Technology,Nanjing 211169,China)

机构地区：[1]金陵科技学院,江苏南京211169

出　　处：《无线互联科技》2024年第10期10-16,共7页Wireless Internet Technology

基　　金：国家自然科学基金;项目名称:高性能三维封装宽带反相滤波功分器建模方法与综合设计研究;项目编号:62101224。江苏省自然科学基金;项目名称:三维封装宽带反相功分电路的建模与综合设计研究;项目编号:BK20210004。金陵科技学院高层人才科研启动基金;项目名称:基于封装的宽带反相滤波功分电路建模与综合设计;项目编号:jit-b-202152。

摘　　要：基于耦合双线与三线结构,文章提出一种紧凑型宽带滤波功分器的设计方法。通过延长耦合三线结构中两输出边线为终端短路枝节,实现通带两侧带有传输零点的滤波响应。同时,文章利用延长的短路枝节,构造带通耦合线结构,用于新型隔离网络的设计,实现输出端口间良好的宽带隔离。为指导设计,文章根据奇偶模等效电路,对三端口滤波功分器的理论滤波响应进行了预测,分析实现良好端口隔离的阻抗条件,从而确定滤波功分器的初始尺寸和隔离电阻初始值。作为验证,利用多层平面印刷电路,设计、加工了一款中心频率位于1.93 GHz、3 dB相对带宽为60.5%的滤波功分器原型,并进行了测试。结果表明,该滤波功分器在0~2.26 GHz内实现了15 dB的端口隔离,实际电路的尺寸仅有0.35λg×0.17λg。Based on coupled dual-line and three-line structures,a design method for broadband filtering power divider(FPD)is proposed.By extending two output side lines in the coupled three-line structure as the short-circuited ones,filtering response with two transmission zeros at both sides of the passband is achieved.Meanwhile,by exploiting the extended short-circuited stubs,bandpass coupled structures can be constructed to design new isolation network,leading to good wideband isolation between output ports.For design guidance,theoretical filtering response of the three-port FPD is predicted and the impedance condition for good port-to-port isolation is analyzed according to the even-/odd-mode equivalent circuits.Then,the initial size of proposed FPD as well as the initial value of isolation resistor can be determined.For verification,an FPD prototype centered at 1.93 GHz with a 3 dB fractional bandwidth of 60.5%is designed and fabricated by utilizing the multilayer planar printed circuit and the measurement is also conducted.Results show that proposed FPD exhibits 15 dB port-to-port isolation from DC to 2.26 GHz,and the dimension of realized circuit is only 0.35λg×0.17λg.

关 键 词：滤波功分器 宽带 耦合三线 隔离网络 多层印刷电路 小型化 

分 类 号：TN626[电子电信—电路与系统]