A circular polarized square fractal patch antenna with square slot and via is proposed, which can be applied to global navigation satellite systems. Two pairs of square ring slot with different sizes are placed diagonally for antenna circularly polarized radiation. By changing the square patch into a fractal structure and adding defective ground structure, miniaturization can be achieved while the bandwidth is further expanded. The total antenna size is 0.3λ_o × 0.3λ_o × 0.03λ_o (λ_o is the free-space wavelength at 1.575 GHz). The final measurement results show that the maximum gain is 3.26 dBic, the 3 dB axial ratio (AR) bandwidth is 1.57–1.6 GHz and the impedance bandwidth (S11 < −10 dB) is more than 60 MHz at the resonant frequency of 1.575 GHz.

中文翻译：

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一种用于全球导航卫星系统的紧凑型圆极化贴片分形天线

提出了一种带方形槽孔的圆极化方形分形贴片天线，可应用于全球导航卫星系统。两对不同尺寸的方形环形槽对角放置，用于天线圆极化辐射。通过将方形贴片改为分形结构并增加缺陷接地结构，可以在进一步扩大带宽的同时实现小型化。总天线尺寸为 0.3 λ _o  × 0.3 λ _o  × 0.03 λ _o ( λ _o是 1.575 GHz 的自由空间波长）。最终测量结果表明最大增益为 3.26 dBic，3 dB 轴比（AR）带宽为 1.57–1.6 GHz，阻抗带宽（S11 < -10 dB）在 1.575 GHz 谐振频率下大于 60 MHz .