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=== Coupled lines ===
Coupled lines are two transmission lines between which there is some electromagnetic [[coupling (physics)|coupling]]. The coupling can be direct or indirect. In indirect coupling, the two lines are run closely together for a distance with no screening between them. The strength of the coupling depends on the distance between the lines and the cross-section presented to the other line. In direct coupling, branch lines directly connect the two main lines together at intervals.<ref>{{multiref|Magnusson ''et al.'', p. 199.|Garg ''et al.'', p. 433.|Chang & Hsieh, pp. 227–229.|Bhat & Koul, pp. 602–609.}}
Coupled lines are a common method of constructing [[power dividers and directional couplers]]. Another property of coupled lines is that they act as a pair of coupled [[resonator]]s. This property is used in many distributed element filters.<ref>Bhat & Koul, pp. 10, 602, 622.</ref>
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