LID CO., LIMITED

Introduction In an era of hyper-connected electronics, electromagnetic interference (EMI) and radio-frequency interference (RFI) pose critical threats to device performance. EMI shielding membrane switches act as the first line of defense, leveraging  shielding effectiveness  (measured in decibels, dB) to block unwanted signals. This guide explores how these switches achieve 80–100 dB shielding, protecting medical devices, industrial machinery, and automotive systems. The Science Behind Shielding Effectiveness Shielding effectiveness  quantifies a membrane switch’s ability to reduce EMI/RFI. Key mechanisms include: Reflection : Conductive materials (silver/copper ink, metal foils) reflect high-frequency waves. Absorption : Layered composites convert electromagnetic energy into heat. Grounding : Redirects electrostatic discharge (ESD) to prevent voltage spikes. Technical Breakdown : Conductivity : Materials with 0.05–0.1 ohms/sq conductivity (e.g., silver paste) maximize s...

In an era where electronic devices are increasingly compact and interconnected, electromagnetic interference (EMI), radio-frequency interference (RFI), and electrostatic discharge (ESD) pose significant threats to device performance. EMI shielding membrane switches are engineered to mitigate these risks, ensuring reliable operation in critical applications. This technology combines advanced materials and precision design to create a protective barrier against unwanted electrical noise. How EMI Shielding Membrane Switches Work EMI shielding membrane switches utilize conductive layers to block or absorb electromagnetic waves. The core principle involves creating a barrier—often referred to as a "Faraday cage"—that reflects or dissipates interference before it reaches sensitive circuitry. Key mechanisms include: Reflection : Conductive materials like copper or silver ink reflect high-frequency EMI/RFI signals. Absorption : Layered composites absorb and convert electromagnetic en...