Measure of power reflected by a discontinuity in a line or fiber
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. It is usually expressed as a ratio in decibels (dB);
where RL(dB) is the return loss in dB, Pi is the incident power and Pr is the reflected power.
Return loss is related to both standing wave ratio (SWR) and reflection coefficient (Γ). Increasing return loss corresponds to lower SWR. Return loss is a measure of how well devices or lines are matched. A match is good if the return loss is high. A high return loss is desirable and results in a lower insertion loss.
From a certain perspective 'Return Loss' is a misnomer. The usual function of a transmission line is to convey power from a source to a load with minimal loss. If a transmission line is correctly matched to a load, the reflected power will be zero, no power will be lost due to reflection, and 'Return Loss' will be infinite. Conversely if the line is terminated in an open circuit, the reflected power will be equal to the incident power; all of the incident power will be lost in the sense that none of it will be transferred to a load, and RL will be zero. Thus the numerical values of RL tend in the opposite sense to that expected of a 'loss'.
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by intrinsic loss in the DUT and/or mismatch. In case of extra loss the insertion loss is defined to be positive. Mismatch lossReturnloss Pozar, David...
capacitors, resistors) may be expressed using S-parameters, such as gain, returnloss, voltage standing wave ratio (VSWR), reflection coefficient and amplifier...
electromechanical switches provide the lowest possible loss along the transmission path. Returnloss is caused by impedance mismatch between circuits. At...
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loss and returnloss. Measurements of these parameters are now defined in IEC standard 61753-1. The standard gives five grades for insertion loss from A...
latter is also called the holding period return. A loss instead of a profit is described as a negative return, assuming the amount invested is greater...
delivered to the given point after bridging. The term is introduced because returnloss is not applicable to the high-impedance input conditions. The term is...
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of a bad crimp or bad connection at the RJ45 plug. Returnloss is usually not significant in the loss of a signal, but rather signal jitter. In twisted-pair...
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value such as 25 dB. Isolation can be estimated from the coupling plus returnloss. The isolation should be as high as possible. In actual couplers the...
the power loss that occurs when coupling light from one optical device or medium to another. (See also Optical returnloss.) Coupling losses can result...
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reflections, that is, returnloss. Returnloss by itself does not reveal much, since the cable design will have some intrinsic returnloss anyway due to not...
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