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In this paper, a novel four-port symmetric coupled composite right-/left-handed (CRLH) transmission line in common- /difierential-mode operation is introduced. The symmetric metamate- rial structure is based on a unit-cell which under a difierential-mode excitation behaves like a CRLH metamaterial with bandpass fllter char- acteristics. In contrast, the CRLH metamaterial is below the cut-ofi frequency under a common-mode excitation. To validate these fea- tures, a flve-cell four-port symmetric CRLH-TL is simulated, fabri- cated, and measured, and the obtained results verify the bandpass fllter features of the structure under difierential-mode excitation.

SYMMETRIC COUPLED COMPOSITE RIGHT-/LEFT-HANDED TRANSMISSION LINE IN COMMON-/DIFFERENTIAL-MODE OPERATION