Contents
What does reflected power mean?
The reflected power is defined as the portion of the generated microwave power that is not coupled into the process and that returns back to the generator. This article describes what the reflected power value means, which parameters influence the reflection of the microwaves and how to minimize the reflected power.
What is considered a bad VSWR?
The range of values for VSWR is from 1 to ∞ . A VSWR value under 2 is considered suitable for most antenna applications. The antenna can be described as having a “Good Match”. So when someone says that the antenna is poorly matched, very often it means that the VSWR value exceeds 2 for a frequency of interest.
What is forward power and reverse power?
Low forward power is in the normal operational zone of the generator where it is supplying Active and Reactive power to the grid(Power Factor Lagging). Reverse power happens when the Prime mover or Turbine has suddenly stopped or Tripped but the generator CB is still closed and Generator is still connected to the grid.
What does reflected power mean on a transceiver?
The reflected waves are the waves (currents) that are returning to the transceiver due to a mismatch (antenna not being 50-ohms Z). The ratio of the forward vs. the reflected power is called VSWR or SWR.
What’s the difference between VSWR and reflected power?
If 100 percent of the transmitted power is reflected, the VSWR is infinity. Return loss is another term used to describe the amount of power being reflected from the load. Return loss is expressed in terms of dB. If 10,000 watts is transmitted and 23 watts reflected, the return loss is 26.4 dB.
How is the amount of reflected power calculated?
The amount of reflected (thus supposedly lost) power is directly related to VSWR and usually quantified in tables like this: The Mismatch Loss in dB is calculated with the formula below: For example, with VSWR=5.85, according to this approach, more than 50% of the power should be lost (-3.021 dB). Where does the energy go?
How is the reflected power of an antenna calculated?
This ratio is calculated by comparing the forward to the reflected waves. A meter will display this reflected power as SWR on the readout. I have a chart that will show (in percentile) of how much power is being lost or absorbed from the actual transmitted power going to the antenna.