The Hybrid couplers are the bidirectional couplers which can give equal power split and 180° phase shift between the two output ports. At lower frequencies the size of the rat race coupler becomes larger. Hence, the size of hybrid coupler should be reduced in order to agree with application requirements. Reduction of hybrid coupler size is achieved by replacing each section using T-shape structures for different characteristic impedance. The hybrid ring with T-shape structure and conventional hybrid coupler is compared. By using T-shape structure 88% of size reduction has been achieved.
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