RFDirectional Coupler Calculator
rf
directional coupler
coupling factor
insertion loss
directivity
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This page provides a directional coupler calculator. Use it to determine key parameters like coupling, coupling loss, insertion loss, and directivity.
Directional Coupler Equation
The directional coupler is a crucial component in RF conformance tests for many wireless devices. It’s also used to tap off power to other RF circuits from the main transmission path. Directional couplers are primarily characterized by two factors: the coupling factor and the directivity.
EXAMPLE:
INPUTS:
- P1 = 30dBm
- P2 = 29.5dBm
- P3 = 1dBm
- P4 = 5dBm
OUTPUTS:
- Coupling (dB) = 7.78
- Coupling Loss (dB) = 0.8
- Insertion Loss (dB) = -0.73
- Directivity (dB) = 7
A directional coupler has four ports:
- Input Port
- Output Port (Through Port)
- Coupled Port
- Isolated Port
The following formulas are used in the directional coupler calculator. Directivity measures the ratio of power at the coupled port to the isolated port.
