准八木天线的小型化和宽带化研究

Rese arch on Miniaturization and Broadband of the Quasi-Yagi Antenna

在传统准八木天线基础上,通过合理布局及容性加载技术,本文首先提出了一种小型化准八木天线,该天线在超高频(Ultra-High Frequency;UHF)射频识别(Radio Frequency Identification;RFID)频段内增益约为6.5d Bi,天线基片尺寸仅仅只有中心频点自由空间波长1/3;为了能够进一步拓宽天线带宽,将原天线中的馈源振子改为领结型结构,天线增益降为4d Bi左右,但-10d B相对带宽达到42.6%。通过样品测试,天线的仿真结果与测试结果吻合较好,验证了本文所提技术方案的可行性和正确性。

Based on the conventional Quasi-Yagi antenna,this paper presents a novel miniaturization antenna by rearranging the layout and capacitive leading technique.The antenna has a 6.5 d Bi gain at UHF and its size is just 1/3 of the wavelength of center frequency in free space.Meanwhile,to extend the antenna bandwidth,a modified bowtie dipole is replaced as the driven dipole and its relative bandwidth（S11 -10 d B） achieves 42.6% and its gain is about 4 d Bi.The measurement of the sample is agree well with the simulation by software HFSS,which validate the scheme in this paper.