Wideband planar 3 dB branch line coupler improving selectivity

摘要

The present invention relates to a wideband branch line coupler and, more specifically, to a wideband branch line coupler which can expand an operating frequency to wideband by arranging a branch line at a coupled line, and improves the selectivity by coupling an open stove with the coupled line again to reduce the false operation caused by noise or intermodulation distortion.