High-gain dual-wideband ±45° dual polarization (DWDP) antenna for indoor distributed antenna system (IDAS) applications

This paper presents two different configurations of ±45° dual-wideband dual-polarized (DWDP) antennas. The antenna comprises eight end-loaded broadband dipoles grouped into two sets based on the bands of operation. The high-frequency dipoles are strategically placed within the low-frequency ones to form the elementary unit. Further optimization has been performed on the elementary unit in terms of the radiator placement to suppress sidelobe levels for array formation. Both configurations are meticulously fabricated using an all-metal structure, demonstrating durability and the simplicity of fabrication. The antenna designs achieve ±45° polarization, high gain, satisfactory cross-polarization discrimination (XPD), and wide impedance bandwidth covering 0.67–1.04 GHz and 1.54–3 GHz bands. Despite the nested configuration, mutual coupling is well within acceptable limits. Formation of the array based on the optimum elementary unit has been investigated by simulation, revealing reasonable gain enhancement and low sidelobe levels across all bands. This comprehensive approach yields a robust, high-performing antenna configuration suitable for indoor distributed antenna system (IDAS) applications.