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This study introduces a novel multiple-input multiple-output (MIMO) antenna design for wide scanning applications. The innovative design enhances element isolation, achieving a high gain and low side lobe level for effective phased-array antenna performance.

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Area of Science:

  • Electrical Engineering
  • Antenna Theory
  • Electromagnetics

Background:

  • Phased-array antennas are crucial for modern wireless communication systems.
  • Achieving wide scanning angles while maintaining high isolation between elements is a significant challenge.
  • Existing designs often struggle with mutual coupling, limiting performance.

Purpose of the Study:

  • To design and analyze a multiple-input multiple-output (MIMO) antenna for wide scanning applications.
  • To improve isolation between radiating elements using slits in the patches.
  • To develop a phased-array antenna with high isolation and wide scanning capabilities.

Main Methods:

  • Design of a compact, linear eight-element array with interelement spacing of λ/2.
  • Incorporation of slits into patch elements to enhance isolation.
  • Analysis of antenna performance including S-parameters, radiation patterns, and beam-scanning.
  • Evaluation of mutual coupling, gain, side lobe level (SLL), envelope correlation coefficient (ECC), and diversity gain (DG).

Main Results:

  • Achieved very low mutual coupling (S21 = -24 dB) in the worst case.
  • Realized a peak gain of 9.3 dBi.
  • Obtained a side lobe level (SLL) of 11 dB at a scanning angle of 70°.
  • Demonstrated excellent beam-scanning performance in the E-plane.

Conclusions:

  • The proposed antenna design effectively combines high isolation and wide scanning capabilities.
  • The design meets the requirements for a desired phased-array antenna.
  • Simulated and measured results showed close agreement, validating the antenna's performance.