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设计了一种新型宽带准八木天线,该天线采用微带线进行馈电,通过一种新型的巴伦结构实现了微带线到共面带状线的转换。天线有一个辐射振子和两个引向振子,介质板背面的金属地板作为反射器,具有较宽的带宽。为了进一步提高增益,在引向振子前端加载两组开口谐振环单元。改进后天线的-10 dB阻抗带宽为53.7%(5.9~10.2 GHz),增益达到了5.7~9.3 dB,相比改进前平均提高了2 dB。对原型天线和改进后天线分别进行了加工测量,测量结果与仿真结果基本吻合。
A new wideband quasi-Yagi antenna is designed. The antenna is fed by microstrip line, and the conversion from microstrip line to coplanar strip line is realized by a new type of balun structure. The antenna has a radiating dipole and two dipoles, and the metal floor on the back of the dielectric slab acts as a reflector with a wide bandwidth. In order to further increase the gain, the front end of the dipole is loaded with two sets of split ring resonator elements. The improved antenna has a -10 dB impedance bandwidth of 53.7% (5.9-10.2 GHz), a gain of 5.7-9.3 dB and an average increase of 2 dB over the previous improvement. The prototype antenna and the improved antenna were processed and measured respectively, and the measured results are in good agreement with the simulation results.