# A Flexible Quadrature Coupler With Reconfigurable Frequency and Coupling Ratio in Switchable Coupling Direction

> Research article (IEEE Transactions on Microwave Theory and Techniques, 2019) · cited 30× · AI/ML

**Wikidata**: [openalex:W2952652604](https://www.wikidata.org/wiki/openalex:W2952652604)  
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