This calculator determines the coupling, coupling loss, insertion loss and directivity of a directional coupler from the measured powers. It is useful for evaluating the performance of a measuring or monitoring device in an RF system.
Formulas
Coupling = -10 × log10(P4 / P1)
Coupling loss = -10 × log10(1 − (P4 / P1))
Insertion loss = -10 × log10(P2/P1 + P3/P1 + P4/P1)
Directivity = -10 × log10(P3 / P4)
Explanation of formulas
The powers P1, P2, P3 and P4 represent the input power, transmitted power, reflected power and coupled power respectively. The equations allow analysis of coupler losses and directivity, essential for measuring the ratio between forward and reverse power and ensuring accurate signal measurement.
Uses of the calculator
- Performance evaluation of a directional coupler in RF systems.
- Analysis of directivity and power losses.
- Useful tool for designing RF measurement and monitoring networks.
- Application in laboratories, antenna testing and transmission systems.