Ultra-Long-Range Dual Rotman Lenses-based Harmonic mmlD's for 5G/mm-Wave loT Applications

For the first time, the authors propose a Rotman Lenses-based Harmonic mmlD tag topology featuring an ultra-long interrogation range for future 5G/mm-Wave loT. The proposed system also displays a wide-angular coverage with a −8.5 dB beamwidth of ±45°, a harmonic RCS of −37.4 dBsm, while demonstrating the longest reported range of passive harmonic mmlD systems. Additionally, the lens-based system provides a theoretical x9.6 range extension compared to the reported state-of-the-art in fully-passive doubler mmlD systems. With a theoretical maximum range of 560 m with 5G/mm-Wave EIRP of 75 dBm, this system presents a paradigm shift in ultra-long-range, fully-passive 5G/mm-Wave loT systems.