探针馈电贴片天线的建模及其在滤波天线中的应用  

Modeling of Probe Fed Patch Antenna and Its Application in Design of Filtering Antenna

作　　者：马润波[1] 张琼[1] 陈新伟[1] 闫丽云[1] 韩丽萍[1] 

机构地区：[1]山西大学物理电子工程学院,山西太原030006

出　　处：《测试技术学报》2015年第2期137-144,共8页Journal of Test and Measurement Technology

基　　金：山西省自然科学基金资助项目(2012011013-3);山西省青年科学基金资助项目(2010021015-1;2014021021-1)

摘　　要：针对探针馈电矩形微带贴片天线的建模,本文提出了一种新的集总元件等效电路,并给出了等效电路模型中元件参数的相关公式,尤其包含了馈电探针的位置参数.此等效电路的特点是其端口特性能够在比较宽的频率范围内与物理模型保持一致.为了验证该等效模型,以滤波器综合理论和所提出的等效电路模型为基础,设计了一个中心频率为2.4GHz,且具有二阶巴特沃尔斯带通滤波器响应的滤波天线,其中用提取好的2.4GHz探针馈电矩形微带贴片天线等效电路模型取代滤波器的末级谐振回路和端口.整个滤波天线的等效电路仿真结果与其物理结构仿真结果吻合较好,经实测得到的反射系数、方向图和增益也与仿真结果一致.Focusing on the modeling of probe fed rectangular microstrip patch antenna, a new lumped- element equivalent circuit is proposed in this paper, and the relevant formulae determining component values in the circuit are also given, especially considering the position of the feed. The reflection coeffi- cient and input impedance of both antenna structure and its equivalent circuit model keep consistent in a wide frequency range. In order to verify the feasibility of the equivalent circuit model, based on the filter synthesis theory and the proposed equivalent circuit, the design of a 2.4GHz filtering antenna with char- acteristics of second-order Butterworth bandpass filter is demonstrated, in which the second port and the last resonant circuit of the prototype filter are replaced by the proposed equivalent circuit of a 2. 4 GHz probe fed patch antenna. Results ＂of electromagnetic simulation and equivalent circuit modeling show good agreement. The measured results, including the reflection coefficient, radiation pattern, and radia- tion gain versus frequency, agree well with the simulated ones.

关 键 词：探针馈电贴片天线 滤波天线 等效电路 

分 类 号：TN713.5[电子电信—电路与系统]