一种新型共边矩形环嵌套的分形多频天线设计

Design of a New Fractal Multi-Frequency Antenna Composed by Multiple Nested Rectangular Rings

提出了一种新型分形结构的天线,该分形结构由多个共用一条边的矩形环嵌套构成。由于结构的自相似特性,使天线能够在多个频段工作。研究表明,天线的通频带个数由分形结构的矩形环个数控制,且各谐振频点与相应辐射单元的尺寸密切相关。设计了能同时工作在蓝牙、WLAN和Wi MAX频段的三频天线,天线仿真的谐振频点分别为2.44 GHz、3.55 GHz和5.59 GHz,相应的带宽分别为7.0%(2.35 GHz^2.52 GHz)、15.0%(3.28 GHz^3.81 GHz)和30.1%(5.13 GHz^6.95 GHz)。实物的测试结果与仿真结果基本吻合,符合设计要求。

A new fractal structure antenna which composed of multiple nested rectangular rings is presented. Those rectangular rings share a common edge. Because of fractal＇s self-similarity, antenna can work in multiple frequency bands. The research shows the number of transmission bands is controlled by the number of rectangular rings. And each resonant frequency is closely related to the size of the corresponding radiation elements. A tri-band antenna that can work in the Bluetooth, WLAN and WiMAX bands is designed. The three resonant frequencies of the antenna are 2.44 GHz,3.55 GHz and 5.59 GHz,respectively. The corresponding bandwidths are 7.0% （2.35 GHz-2.52 GHz）, 15.0% （ 3.28 GHz - 3.81 GHz） and 30.1% （ 5.13 GHz - 6.95 GHz）, respectively. The measured result is consistent with the simulated result,which verifies the correctness of the design.