Novel closed-form solutions for designing extended-composite right/left-handed trans mission lines

Characteristics of the extended-composite right/left-handed transmission line (E-CRLH TL) has been investigated in this paper. From cut-off frequencies of RH and LH bands, L-C elements of the E-CRLH TL unit cell are determined by new closed-form solutions. Lastly, one example is shown to confirm the usefulness of our method.