A 64-Element and Dual-Polarized SICL-Based Slot Antenna Array Development Applied to TDD Massive MIMO

This letter reports the concept, design, fabrication, and characterization of a novel 64-element, slot-based and substrate-integrated coaxial line (SICL)-fed dual-polarized antenna array (SICL-SAA) for fully digital massive multiple-input–multiple-output (mMIMO) applications. The proposed array is composed of ±45° polarized elements based on half-wavelength slots. Each slot has its own back cavity...