Miniaturized high-performance D-CRLH resonator and filter based on accurate equivalent circuit model

A novel Dual Composite Right-Left Handed (D-CRLH) resonator is proposed in this paper. This type of the resonator is frequency-independent and formed by using the interdigital capacitor and wire inductor. Compared with the conventional half-wavelength resonator, this type of the resonators is much smaller with nearly 1/20 guided wavelength (λ_g). Moreover, by combining the proposed equivalent circuit method, the selectivity and high stopband suppression of the resonator unit are improved, which makes it suitable for implementing the miniaturized high-performance filter. For demonstration, a high-performance second-order filter is designed and measured, verifying the validity of the proposed equivalent circuit method.