A 0dB crossover based on novel composite right/left handed transmission line

In this paper, a novel OdB crossover centering at 1.8GHz is proposed based on the initially proposed composite right/left handed transmission line (CRLH TL). The CRLH TL synthesized by Wunderlich-shaped dentiform capacitor and meandered-line short-circuited stub inductor (SSI) can be considered as a complete alternative to its conventional counterpart formed by interdigital capacitor and SSI. Extracted circuit parameters based on the constitutive electromagnetic parameters indicate that the left handed (LH) capacitor has increased obviously by using fractal concept. The enhanced LH capacitor is the key factor of the resultant lower resonance of CRLH cell which enables the design of an electrically smaller particle. The particular merit of the novel CRLH TL suggests potential application in compact microwave devices design. To illustrate possible application, a crossover is designed. Numerical results indicate that the crossover has received 46.2% size reduction and simultaneously exhibits comparable performance relative to its conventional counterpart.