variable coupling

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var·i·a·ble cou·pling

where several extrasystoles are seen, the interval between each of them and the preceding sinus beat varies.
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The work demonstrated in this paper showed how a low cost acrylic-based variable coupling ratio Y-branch POF coupler can be implemented using a single structure Y-branch.
The design of the variable coupling ratio coupler is based on a simple Y-branch structure.
Figure 5 shows the design plot of the variable coupling ratio Y-branch coupler.