Return Loss and Mismatch Loss Calculator

Calculates the absolute load impedance, reflection coefficient, VSWR, return loss and mismatch loss of a load. This circuit can be simulated in a FLEXI-BOX, and a transmission line (50 Ohm track) PCB is available which easily adapts for this circuit with one simple trimming operation. There is a selection of 50 Ohm RF connectors available and a 75 Ohm BNC or TNC will also fit directly onto the box with no modifications.

[mismatch circuit]

The absolute value of the load impedance is calculated from the complex impedance (R + j).

Where R is the Real part of the impedance

and j is the Imaginary part of the impedance

The Load Reflection Coefficient ( Γ ) is calculated using the complex impedance of the load and the characteristic impedance of the source.

[reflection coefficient formula]

Where Zo is the Source Impedance

The VSWR is then calculated using the Reflection Coefficient

The Reflection Coefficient is used again to calculate the Return Loss

The Reflection Coefficient is used yet again to calculate the Mismatch Loss

Various formulas for Voltage Reflection Coefficient and VSWR are also available at:-

http://www.kathrein-scala.com/tech_bulletins/EngRef.pdf

This calculator is provided free by Chemandy Electronics in order to promote the FLEXI-BOX

Return to Calculator Index

Source Impedance:	Ohms	Absolute Load Impedance:	Ohms
Load Impedance R:	Ohms	Load Reflection Coefficient:
Load Impedance J:	Ohms	Load VSWR:
		Load Return Loss:	dB
		Load Mismatch Attenuation:	dB