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Itoh, T., Caloz, C., Lin, I.-H., & Okabe, H. (2010). Composite right/left handed (CRLH) branch-line couplers. (Patent no. US7667555). External link
Itoh, T., Caloz, C., Lin, I.-H., & Okabe, H. (2005). Composite right/left handed (CRLH) couplers. (Patent no. US7508283). External link