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We present a three-section quadrature hybrid based on slot-coupled directional couplers, which operates over a bandwidth from 3.1 to 10.6 GHz. A prototype has been fabricated which exhibits a return loss better than 20 dB, isolation around 20 dB, an amplitude imbalance between output ports of less than plusmn0.75 dB and a phase imbalance between +1degand -3degacross the 3.1-10.6 GHz band. This design outperforms previously reported results for ultra wide band operation.
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Moscoso‐Mártir et al. (2009) studied this question.
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