Mutual Coupling and Cross Polarization Reduction of a Compact Microstrip Array Antenna Using a Pair of Parasitic Resonators

Document Type : Original Article

Author

Assistant Professor, Department of Telecommunication Electrical Engineering, Faculty of Engineering, Shahid Madani University of Azerbaijan, Tabriz, Iran

Abstract

In this article an efficient multifunctional method is presented to reduce mutual coupling and cross polarization, simultaneously in a 2-element H-plane array antenna in a compact format. In this approach, a pair of parasitic microstrip elements is placed near the radiating edges in two radiation patches, creating a new field coupling path opposite to the main coupling, leading to a significant increase in isolation. In addition, due to the structure and position of these parasitic strips, the near field resulting from cross currents on the patches is significantly neutralized, leading to the elimination of cross polarization and thus improving the polarization purity. Furthermore, this method can prevent the increase of the cross polarization due to the error of probe position on the patches up to 8 dB. In order to validate the proposed method, an optimal sample is fabricated and measured and the results are compared to those of simulations. The measurements show more than 32dB isolation, over 30dB impedance matching, and about 38dB (reduced by at least 10dB) cross polarization, which are in good agreement with the simulations. The advantages of this design are that the gain and radiation efficiency are not decreased and the reduction of the resonance frequency is about 150 MHz which can decrease the overall size of the array. Finally, a comparison with novel designs and the related discussions are presented.

Keywords

References

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History

  • Receive Date: 29 December 2020
  • Revise Date: 22 February 2021
  • Accept Date: 03 July 2021

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