Design and Fabrication of ISM band Dielectric Rod Antenna with simultaneous dual circular polarization

Document Type : Original Article

Authors

1 Ph.D., Malek Ashtar University of Technology, Tehran, Iran

2 Professor, Malek Ashtar University of Technology, Tehran, Iran

3 masters student, Malek Ashtar University of Technology, Tehran, Iran

Abstract

In this article, based on theoretical and experimental expressions, a dielectric rod antenna with dual circular polarization in ISM band is designed, simulated and fabricated. In order to improve the radiation parameters, the plan of creating a groove on the dielectric rod has been implemented for the first time. Creation of dual circular polarization in the designed antenna is done by two orthogonal probes, which can provide left-circular and right-circular polarizations by making a 90-degree phase difference between the two ports by using a 90˚ hybrid. The dielectric constant of the material used in the rod with repect to the fabricated antenna results has been estimated at 2.4. Due to the limitation in the diameter of the dielectric rod and to improve the radiation parameters, a new design has been introduced and, also two grooves have been created on the dielectric rod. The simulation results show that the use of the new design results in a reduction of 4dB in the side lobe level. According to the measured results, the fabricated antenna has a reflection coefficient of less than -10dB for each port and an isolation of less than -16.4dB between the two ports. Also, the HPBW is 29.2 degrees and the SLL is 13.8dB in the center frequency. The axial ratio of the antenna is less than 3dB in the desired frequency range for LHCP and RHCP.

Keywords

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References

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Radar
Volume 11, Issue 1
Serial number 29, spring and summer quarterly
August 2023

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History

  • Receive Date: 06 April 2023
  • Revise Date: 25 July 2023
  • Accept Date: 04 August 2023
  • Publish Date: 23 August 2023

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