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Abstract
An UWB 90° phase shifter based on broadside coupler and T-shaped stub is proposed. Its operation mechanism is explained by the equivalent circuit. The measured results exhibit that the bandwidth is 126.7% with phase deviation within ±6°, and the insertion loss is <1.8 dB over the frequency band from 2.2 to 9.8 GHz. Comparison shows that the proposed design not only achieves the widest bandwidth, but also has low insertion loss and small phase difference. This design is a good candidate for UWB applications due to its low cost, planar structure, and convenient installation.
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