RF Directional Coupler

Function: Samples forward and reflected RF signals in a transmission line.

Key Parameters:

• • Coupling Factor: 10, 20, 30 dB (common)
• • Directivity: >20 dB (higher is better)
• • Frequency Range: e.g., 800–2500 MHz
• • Power Rating: Average & peak power handling
• • VSWR: Typically <1.5:1

Ports:

• • Input
• • Output (Through)
• • Coupled Port (Forward)
• • Isolated Port (Reflected)

Applications: SWR measurement, power monitoring, signal injection.

Design Tip: Use high-directivity couplers for accurate reflection measurements.