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<p>A compact and reconfigurable microstrip triangular patch antenna with polarization switching capability between left-hand circular polarization (LHCP), right-hand circular polarization (RHCP), and linear polarization (LP) is proposed in this paper. The antenna consists of a triangular patch, spur lines are etched along two opposite radiating edges to achieve LHCP and RHCP. Turning p-i-n diodes ON or OFF allows the antenna's polarization to be controlled. Impedance and axial ratio bandwidths are enhanced using a proximity-coupled feed. Compactness in the structure is obtained by loading a circular ring slot into the radiator. Performance in terms of reflection coefficient, gain, impedance bandwidth (IMBW), axial ratio bandwidth (ARBW), and radiation pattern are measured and compared with those obtained with full wave analysis. The measured impedance bandwidth in all polarization states is more than 130&#xa0;MHz (&gt; 2.9%), while the axial ratio bandwidth for both LHCP and RHCP states is more than 120&#xa0;MHz (&gt; 2.8%). The measured overlapped impedance and axial ratio bandwidth for CP modes are more than 113&#xa0;MHz and 105&#xa0;MHz, respectively. The size of the overall structure is 1.01 × 1.01 × 0.03&#xa0;λg<sup>3</sup>, where λg is the guide wavelength. The proposed antenna is suitable for Wireless Local Area Networks and sub-6&#xa0;GHz applications due to its compact and simple geometry. These compact and reconfigurable antennas can be fitted in small volumes, improve throughput, and reduce latency in wireless networks. By using a single reconfigurable antenna instead of multiple dedicated antennas for different frequency bands or protocols, the cost of hardware design and manufacturing can be reduced.</p>

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Polarization Reconfigurable Compact Triangular Patch Antenna Using Spur Lines and Circular Ring Slot

  • 期刊论文

  • 发表日期：

    2025年5月11日

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  • Somia Sharma,
  • Rajesh K. Singh,
  • Ananjan Basu,
  • Shiban K. Koul

摘要

A compact and reconfigurable microstrip triangular patch antenna with polarization switching capability between left-hand circular polarization (LHCP), right-hand circular polarization (RHCP), and linear polarization (LP) is proposed in this paper. The antenna consists of a triangular patch, spur lines are etched along two opposite radiating edges to achieve LHCP and RHCP. Turning p-i-n diodes ON or OFF allows the antenna's polarization to be controlled. Impedance and axial ratio bandwidths are enhanced using a proximity-coupled feed. Compactness in the structure is obtained by loading a circular ring slot into the radiator. Performance in terms of reflection coefficient, gain, impedance bandwidth (IMBW), axial ratio bandwidth (ARBW), and radiation pattern are measured and compared with those obtained with full wave analysis. The measured impedance bandwidth in all polarization states is more than 130 MHz (> 2.9%), while the axial ratio bandwidth for both LHCP and RHCP states is more than 120 MHz (> 2.8%). The measured overlapped impedance and axial ratio bandwidth for CP modes are more than 113 MHz and 105 MHz, respectively. The size of the overall structure is 1.01 × 1.01 × 0.03 λg3, where λg is the guide wavelength. The proposed antenna is suitable for Wireless Local Area Networks and sub-6 GHz applications due to its compact and simple geometry. These compact and reconfigurable antennas can be fitted in small volumes, improve throughput, and reduce latency in wireless networks. By using a single reconfigurable antenna instead of multiple dedicated antennas for different frequency bands or protocols, the cost of hardware design and manufacturing can be reduced.