CP Antenna Array With Switching-Beam Capability Using Electromagnetic Periodic Structures for 5G Applications

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Abstract
This paper proposes a novel circularly-polarized electromagnetic band-gap (EBG) antenna array backed by an artificial magnetic conductor (AMC) that operates in the 26 – 32GHz band. The designed antenna is a 2 x 2 Yagi-Uda antenna array that uses as directors semicircles to direct the radiation in the horizontal end-fire direction. The feeding of the array is designed with two parallel T-junction portions forming a parallel feeding network that converts the polarization from linear to circular. An AMC is placed underneath the antenna to suppress the backward radiation and obtain the propagation only in the +z plane. The novel approach is based on the fact that EBGs are placed around the array to give to the antenna, beam switching capability. This simple technique provides a high beam tilting angle of +90o from the end-fire to the full broadside plane. The final EBG-AMC-antenna array is circularly polarized and presents, at 29GHz, a gain of 11.9dBi, and an AR bandwidth of 10% from 28 to 31GHz. By assessing the high antenna performances presented in this paper, and the high angle beam switching capability by adding the EBG, the novel array could be seen as a potential candidate for implementation in future 5G applications.
Funding Information
  • Natural Sciences and Engineering Research Council of Canada

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