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In this investigation, a single-feed circular patch antenna (CPA) with a pair of curved dumbbell shape defected ground structure (CD-DGS) at the non-radiating periphery has been studied on RT-Duroid substrate material ( \({\varepsilon}_{r}\) = 2.33) for the enhancement of the co-polarization (CP) to cross-polarization (XP) isolation (polarization purity) and impedance bandwidth. A parametric study has been carried out by changing various parameters of the CD-DGS in order to find out an optimum structure that provides the best output in terms of polarization purity and impedance bandwidth without hindering the gain profile. The present investigation results around 12% impedance bandwidth with 26 dB CP-XP isolation. The proposed structure and classical conventional structure provide good impedance matching and stable radiation patterns. Therefore, the present investigation can be used fully in the modern wireless communication system where better XP performance is the major issue.

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Curved Shaped Defected Ground Structure: A Way to Achieve High Polarization Purity, Wide Bandwidth, and Stable Gain

  • 会议论文

  • 发表日期：

    2025年

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  • Zonunmawii,
  • Manoj Sarkar,
  • L. Lolit Kumar Singh,
  • Sudipta Chattopadhyay,
  • Abhijyoti Ghosh

摘要

In this investigation, a single-feed circular patch antenna (CPA) with a pair of curved dumbbell shape defected ground structure (CD-DGS) at the non-radiating periphery has been studied on RT-Duroid substrate material ( \({\varepsilon}_{r}\) = 2.33) for the enhancement of the co-polarization (CP) to cross-polarization (XP) isolation (polarization purity) and impedance bandwidth. A parametric study has been carried out by changing various parameters of the CD-DGS in order to find out an optimum structure that provides the best output in terms of polarization purity and impedance bandwidth without hindering the gain profile. The present investigation results around 12% impedance bandwidth with 26 dB CP-XP isolation. The proposed structure and classical conventional structure provide good impedance matching and stable radiation patterns. Therefore, the present investigation can be used fully in the modern wireless communication system where better XP performance is the major issue.