Electromagnetic Shielding Between Co-Located Operators on a Single Monopole
As mobile network operators race to deploy 5G and expand coverage, the pressure to share infrastructure has never been greater. Tower sharing—placing multiple operators' antennas on a single monopole tower —dramatically reduces capital expenditure, accelerates rollout timelines, and minimizes the proliferation of unsightly towers. However, co-location introduces a critical technical challenge: electromagnetic interference (EMI) between closely positioned antennas. Unlike structural conflicts resolved with steel reinforcement, interference is invisible, frequency-dependent, and can cripple network performance if not properly managed. This blog examines the physics of antenna-to-antenna coupling on a shared monopole, explores the engineering parameters that determine required isolation, and presents the three primary mitigation strategies— antenna spacing, physical barriers, and PIM-optimized hardware —that enable multiple operators to coexist on a single structure without degrading...