An Orthogonally Polarized Shared-Aperture Antenna Based on Structure Reuse of Metasurface
Xiaocheng Wang, Gaobiao Xiao, Hao Cheng, B. Zhao
Abstract
This letter proposes an orthogonally polarized dual-band shared-aperture antenna (SAA) based on the concept of structure reuse of metasurface (MTS). The designed MTS has two layers. At lower band, the MTS is excited by a 2 × 2 slot array to suppress the unwanted modes and stabilize the antenna pattern. At higher-band, the MTS is reused. Each cell of the MTS is considered as a stacked patch antenna and connected in series to form a 4 × 8 series-fed antenna array. The array is differentially fed through a balun to avoid tilting of the main beam. Since the polarization direction of the array is orthogonal to the MTS-based antenna, the isolation is improved. The proposed SAA has a very high aperture reuse efficiency through reusing the whole structure of MTS. In addition, the planar structure is compact and suitable for integration. As an example, we designed a SAA working at about 30 and 60 GHz to verify this concept.