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Broadband circularly polarized beam‐steering antenna array for wireless applications

This article describes the implementation of a broadband circularly polarized (CP) antenna array for switched beam applications. The antenna comprises of four identical CP slot elements in a 2 × 2 configuration that uses a 4 × 4 feeding network. Each CP slot element in the array is sequentially rotated with respect to each other to enhance the antenna's axial‐ratio (AR) bandwidth. Measured results confirm the array exhibits an impedance bandwidth of 2.25 GHz that extends over the frequency range 4.6–6.85 GHz (∼40%) for S11 ≤ −10 dB, and 3 dB AR bandwidth of 1.7 GHz that extends between 4.8–6.5 GHz (∼30%). The antenna's gain is in excess of 6.8 dBi between 5–6 GHz. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:2813–2817, 2014