大频率比的毫米波频率可重构滤波天线  

Millimeter-wave frequency-reconfigurable filtering antenna with high frequency turning ratio

作　　者：杨国[1] 施鸿强 黎小聪 肖如奇 齐世山 吴文[1] YANG Guo;SHI Hongqiang;LI Xiaocong;XIAO Ruqi;QI Shishan;WU Wen(Key Laboratory of Near-Range RF Sensing ICs&Microsystems,Ministry of Education,School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;China Electronic Technology Group Corporation No.55 Research Institute,Nanjing 210016,China)

机构地区：[1]南京理工大学电子工程与光电技术学院,近程射频感知芯片与微系统教育部重点实验室,南京210094 [2]中国电子科技集团公司第五十五研究所,南京210016

出　　处：《物理学报》2025年第1期270-280,共11页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:62271257)资助的课题.

摘　　要：针对现有毫米波频率可重构天线频率调谐比小的问题,本文设计了一款宽频带双频毫米波频率可重构滤波天线.天线以PIN二极管为重构开关,选择阶梯阻抗谐振器作为可重构带通滤波器,并加载U型枝节引入陷波;通过微带线-带状线过渡馈电结构将滤波器与Vivaldi天线级联,并设计了金属腔隔离辐射和滤波两部分,有效降低了电磁干扰和交叉极化.测试结果显示:PIN二极管处于导通状态时,天线工作在25.9-28.6 GHz,最大增益为8.83 dBi;PIN二极管处于断开状态时,天线工作在32.6-35.9 GHz,最大增益为9.97 dBi;可重构中心频率比达到了1∶1.26,两个频带的交叉极化电平均低于-20 dB.To solve the problem of small frequency turning ratio of the frequency-reconfigurable antenna operating in the millimeter-wave band,a millimeter-wave dual-band frequency-reconfigurable filtering antenna is proposed in this work.The proposed filtering antenna consists of a reconfigurable bandpass filter and an ultra-wideband double layer Vivaldi antenna.The reconfigurable bandpass filter is comprised of several components,including parallel coupled lines,stepped impedance resonator(SIR),PIN diodes,U-shaped branches,and bias network.The reconfigurable filter is integrated in the feedline of the Vivaldi antenna,which provides a simple structure and possesses flexibility for further expansion.The reconfigurable characteristic is realized by controlling the electrical length of the open circuit stepped impedance resonator through two PIN diodes,which not only acts as a switch but also affects the impedance matching within the millimeter wave band.Firstly,the equivalent circuit model of the SIR loaded with PIN diode and bias network is analyzed and simulated to achieve dualband reconfigurability in the Ka-band.The bias network consists of fan-shaped branches and high-impedance microstrip lines,which suppresses the flow of RF signals.Two notches are introduced by the two U-shaped branches,which are arranged beside the parallel coupling line without affecting the performance of the reconfigurable filter.The realized two notches are located in the non-operating frequency band between the two reconfigurable bands,which enhances the out-of band performances of the reconfigurable filter.Then,to suppress the unnecessary coupling effect and concentrate the energy on the feedline of the Vivaldi antenna,some metallized vias are loaded on the two sides of the feedline.Finally,a metal cavity is introduced to isolate the radiation from filtering components,and some metal columns are loaded inside the cavity for improving the self-resonance of the metal cavity,which effectively improves the cross-polarization level of the filtering

关 键 词：毫米波天线 滤波天线 频率可重构 PIN二极管 

分 类 号：TN822[电子电信—信息与通信工程]