reflection coefficient, VSWR, reflection/return loss conversion
Enter VSWR, Reflection Coefficient, or Return Loss to calculate remaining values . VSWR, Reflection Coef. Return Loss (dB). VSWR. Return Loss (dB). The VSWR (Voltage Standing Wave Ratio) measurement describes the voltage standing wave pattern that is present in the transmission line due to the phase. The reflection coefficient, VSWR, reflection/return loss conversion This is the ratio of reflected wave to incident wave at point of reflection. This value varies.
When a VSWR of 3.
In actual use, it is not recommended to exceed a VSWR of 3. The reflected wave is degrees out of phase inverted with the incident wave.
The reflected wave is in phase with the incident wave.
Means no reflection occurs and all power is transferred to the load. With open circuit This is an open circuit condition with no antenna connected. It means that ZL is infinite and the terms Zo will disappear in Eq.
No power is transferred and VSWR will be infinite. With short circuit Imagine the end of the cable has a short circuit. It means ZL is 0 and the Eq. No power is transferred and VSWR is infinite. With correctly matched antenna.
When a correctly matched antenna is connected, then all energy is transferred to the antenna and is converted to radiation. ZL is 50 ohms and Eq. Thus VSWR will be exactly 1.
With incorrectly matched antenna. The VSWR can be calculated from the reflection coefficient with the equation: The standard output for the return loss is a positive value, so a large return loss value actually means that the power in the reflected wave is small compared to the power in the incident wave and indicates a better impedance match.
The return loss can be calculated from the reflection coefficient with the equation: It indicates the amount of power lost in the system due to the mismatched impedances. The mismatch loss can also be calculated from the reflection coefficient with the following equation: If only the VSWR, return loss, or mismatch loss measurement is to be performed in the analysis, the reflection coefficient define statement must also be present to perform the calculation since it is referenced in all three of these calculations.
A simple circuit is displayed in the figure below to demonstrate the use of these define statement user functions.
VSWR / Return Loss Calculator - Electrical Engineering & Electronics Tools
The circuit consists of a voltage source, two resistors, and an ideal, lossless transmission line. The load resistance has been set to 75 ohms to create a mismatch with the 50 ohm characteristic impedance of the transmission line.
- VSWR / Return Loss Calculator
The four define statement user functions have been entered in the schematic as grid text. Each statement must be entered as a separate grid text.
What is a VSWR, reflection coefficient and reflection and forward power?
They may also be entered in the Text page of the schematic to reduce the clutter in the schematic. An AC analysis simulation is then run on the circuit. The four Y expressions plotted for the simulation are: Since this example circuit is entirely resistive, the AC analysis response will be constant across the entire frequency range.