Power Dividers, Couplers and Combiners Combiners

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Besser Associates ©Besser Associates, Inc. 2012 All rights reserved Directional Couplers • Directional couplers have an arrangement of two transmission lines so that energy can “leak” from one line to the other. • Often used to sample off a small portion of the signal power. • Couplers have a directional property that is useful in many measurements. Besser Associates
Besser Associates ©Besser Associates, Inc. 2012 All rights reserved Directional Couplers •Forward and reverse traveling waves can be observed by the use of a directional coupler. v F v v R 3 = K + F K R 3 4 R 0 R 0 v R v v F 4 = K + F K R R S =R 0 v S 1 2 v R v F R L For ideal case: K R =∞ v S R 0 The dual-directional coupler is two directional couplers connected back-to-back to minimize “leakage” between Ports 3 and 4. FORWARD COUPLING REFLECTED COUPLING R 0 R 0 R L R 0 3 4 R 0 1 IN 2 OUT ©Besser Associates Generated:11/20/2012 Besser Associates
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Power Dividers, Couplers and Combiners Combiners

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