August 13, 2025

Near-field EMI occurs within λ/2π distance (~4.8cm at 1GHz), showing reactive coupling (magnetic/electric dominance), while far-field EMI propagates beyond this range with electromagnetic waves. Near-field strength drops by 1/r² (electric) or 1/r³ (magnetic), versus far-field’s 1/r. Measurement requires H-field probes (<30MHz) or E-field probes, whereas far-field uses antennas (30MHz-6GHz). Near-field identifies component-level leaks; far-field assesses […]

The top 6 coupler loop manufacturers include Murata (30% global RF market share), TDK (Q-factor >1000 at 1GHz), MACOM (military-grade to 40GHz), Anaren (low-loss <0.2dB), Johanson Technology (0402 to 1206 sizes), and Coilcraft (automotive-grade -55°C to +125°C). These innovators dominate 5G/WiFi-6 infrastructure with patented thin-film and multilayer ceramic technologies achieving ±0.5dB coupling accuracy. Top 3