ABSTRACT A single feed square patch with inclined fractal defected ground structure (IFDGS) microstrip antenna for circular polarization (CP) is proposed in this article. The CP radiation is achieved by an inclined fractal-shaped slot is embedded along the diagonal axis of a ground plane. To enhance the performance parameters of this antenna like axial ratio bandwidth, return loss bandwidth, and gain, an inclined fractal structure is slotted into the ground plane. The parameter studies of the IFDGS are given to illustrate the way to obtain CP radiation. The CP antenna with the third iterative IFDGS is fabricated and measured. The measured results validate simulated results and show good agreement. The proposed antenna achieved CP radiation at 2.61 GHz with an overall size of 41 × 41 × 1.6 mm3. It shows an impedance bandwidth of 5.53% at center frequency of 2.6 GHz and 3-dB axial ratio (AR) bandwidth of 1.14% at center frequency of 2.61 GHz. The measured peak gain for the proposed antenna is found as 4.12 dBi. The proposed antenna can be suitable for wireless communication in S-band.

中文翻译：

---

S波段应用斜分形缺陷接地结构的圆极化天线设计

摘要 本文提出了一种用于圆极化（CP）的具有倾斜分形缺陷接地结构（IFDGS）微带天线的单馈方贴片。CP 辐射是通过沿着地平面的对角线嵌入一个倾斜的分形槽来实现的。为了增强这种天线的性能参数，如轴比带宽、回波损耗带宽和增益，在接地平面中开槽了一个倾斜的分形结构。给出了 IFDGS 的参数研究来说明获得 CP 辐射的方法。制造并测量了具有第三次迭代 IFDGS 的 CP 天线。测量结果验证了模拟结果并显示出良好的一致性。建议的天线在 2.61 GHz 下实现了 CP 辐射，整体尺寸为 41 × 41 × 1.6 mm3。它显示阻抗带宽为 5。中心频率为 2.6 GHz 时为 53%，中心频率为 2.61 GHz 时的 3-dB 轴比 (AR) 带宽为 1.14%。建议天线的测量峰值增益为 4.12 dBi。所提出的天线可以适用于 S 波段的无线通信。