宽频带宽波束磁电偶极子天线设计

摘要

为了展宽天线的波束宽度，在磁电(ME)偶极子天线的基础上，该文设计出一种低交叉极化宽频带宽波束的新型磁电偶极子天线。通过将振子倾斜弯折，展宽了天线的波束宽度；结合6个寄生振子的对称加载，提高了辐射方向图的一致性。在型馈电结构基础上，优化天线的振子间距和振子长度，实现了天线58.5%的相对带宽(S11-10 dB)，频带范围为2.3~4.2 GHz；对振子倾斜角度以及寄生振子的参数进行优化，在2.4~4.0 GHz的频带内实现了辐射方向图E面和H面同时达到120°以上的半功率波束宽度(HPBW)。测试与仿真有较好的一致性，证明了所设计天线不仅具有宽频带宽波束特性，同时在整个频带范围内方向图的一致性得到了极大地提高。%In order to broaden the antenna beamwidth, a broadband and wide beam Magneto-Electric (ME)dipole antenna with low polarization is designed based on the conventional ME antenna. By tilting and bending the dipoles, the beam width of the antenna is broadened;the consistency of the radiation pattern is improved by placing 6 parasitic patches symmetrically around the ground center. Optimizing the space between the dipoles and the length of the dipole based on the-shaped feed structure, a relative bandwidth of 58.5% (S11-10 dB) from 2.3~4.2 GHz is achieved. By optimizing the tilting angle and the parameters of the parasitic dipole, the Half Power Beam Width (HPBW) of E-plane and H-plane is simultaneously broadened to 120° in the frequency range from 2.4~4.0 GHz. The measurement results are in good agreement with the corresponding simulation, which not only prove that the broadband and wide beam characteristics of the designed antenna, but also extremely improve the consistency of the radiation pattern through the whole frequency band.