Peano分形加载单极子辐射性能的研究

对有限地板尺寸和介质填充情况下Peano分形加载单极子天线的辐射特性进行了研究.利用HFSS分析了地板尺寸和填充介质材料对天线反射系数、辐射方向图和增益的影响.仿真表明:随着地板尺寸的减小,天线的阻抗带宽和增益明显减小,H面方向图变化不大,而E面方向图的半功率波束宽度增大,波束仰角减小;填充材料的介电常数过大会导致天线性能的恶化.在分析研究的基础上,设计并研制了地板尺寸为220mm×220mm的一阶和二阶Peano分形加载单极子天线.天线分别实现了45°和36°的波束仰角,50°和45°的半功率波束宽度.仿真与实测结果均表明凋节地板尺寸是控制Peano分形加载单极子天线E面半功率波束宽度和波束仰角的一种简单而有效的方法.

Research on Radiation Performance of a Peano Fractal Loaded Monopole

Effect of a finite ground plane and filled dielectric on radiation performance of a Peano fractal loaded mono- pole antenna is presented. The return loss, radiation pattern and gain of the antenna with different finite ground plane size and filled dielectric were analyzed by HFSS. The simulation results show that impedance bandwidth and gain of the antenna are decreased, pattern in H-plane changes little, 3dB beam width is wider and elevation angle is smaller in E-plane when the size of finite ground plane is decreased. High permittivity of filled dielectric results in the deterioration of performance of the antenna. Based on the analysis, Peano fractal loaded monopole antenna of order 1 and order 2 were designed and fabricated with a ground plane of 220mm ~ 220mm. Elevation angles of these two antennas are 45° and 36° ,3dB beam widths are 50° and 45°, respectively. Simulation and measured results indicate that it is a simple and effective method to adjust 3dB beam width and elevation angle of Peano fractal structure loaded monopole antenna by adjusting the finite ground plane sizes.