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In telecommunications, return loss is a measure in relative terms of the power of the signal reflected by a discontinuity in a transmission line or optical fiber. This discontinuity can be caused by a mismatch between the termination or load connected to the line and the characteristic impedance of the line.
Mismatch loss (ML) is the ratio of the difference between incident and reflected power to incident power: Figure 1. Simple circuit showing characteristic impedance Z o and the load impedance Z L. In a perfectly matched system Z L =Z o, and there is no mismatch loss.
However the same 6:1 mismatch through 75 meters of RG-8A coax would incur 10.8 dB of loss at 146 MHz. [5] (pp19.4–19.6) Thus, a better match of the antenna to the feed line, that is, a lower SWR, becomes increasingly important with increasing frequency, even if the transmitter is able to accommodate the impedance seen (or an antenna tuner is ...
The minimum return loss so measured is called the structural return loss (SRL). SRL is a measure of a cables' adherence to its nominal impedance, but it is not a direct correspondence, as errors further from the generator have less effect on SRL than those close to it.
The logarithm is taken of the magnitude of the reflection coefficient but this is incorrectly referred to as return loss; the result is still reflection coefficient albeit in decibels. The difference between the two is a minus sign... Many recent microwave and antenna papers and several well known books carelessly use return loss.
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The two-rays ground-reflection model is a multipath radio propagation model which predicts the path losses between a transmitting antenna and a receiving antenna when they are in line of sight (LOS). Generally, the two antenna each have different height. The received signal having two components, the LOS component and the reflection component ...
The broadcast bounce is real. As 2024 ends, CBS led the pack in total viewers for the year thanks, of course, to Super Bowl LVIII. No surprise, live sports continues to work its magic for the ...