Description

An RF DC block is a passive coaxial component designed to prevent direct current (DC) from flowing through an RF transmission line, while allowing radio frequency (RF) signals to pass with minimal loss. Think of it as a high-pass filter that blocks DC and very low-frequency signals but lets your RF energy through cleanly. 🔍 Types of DC Blocks: - Inner DC Block: Blocks DC on the center conductor only. Common in test setups and bias-sensitive circuits. - Outer DC Block: Blocks DC on the outer shield (ground). Useful for eliminating ground loops. - Inner/Outer DC Block: Provides isolation on both conductors, offering full DC isolation in coaxial systems. 🔧 Key Parameters: - Frequency Range: Varies by model (e.g., 10 MHz to 18 GHz, or even up to 110 GHz) - Impedance: Typically 50 ohms (75-ohm versions also available) - Voltage Rating: Max DC voltage it can block (e.g., 16 V, 100 V) - Current Rating: Especially important for biasing applications - Insertion Loss: Should be low to minimize RF signal degradation - VSWR: Indicates how well the block matches system impedance 🛠️ Applications: - Preventing DC bias from damaging sensitive RF components - Eliminating ground loops in test and measurement setups - Isolating stages in RF circuits - Biasing active devices (when used with bias tees)