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In this paper, a novel reconfigurable 3-dB directional coupler is presented. Varactors and inductors are loaded to the device to realize the performance of reconfiguration. By adjusting the voltage applied to the varactors, the proposed coupler can be reconfigured from a branch-line coupler (90-degree coupler) to a rat-race coupler (180 or 0 degree coupler) and vice versa. During the tuning, good...
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