Ultra compact CPW dual band filter based on π-generalized metamaterial NRI transmission line

Abstract

This paper presents an ultra compact dual-band coplanar waveguide metamaterial filter based on generalized metamaterial transmission line. The detailed theoretical design steps of the filter are explained. The dual-band filter design performance has been validated using equivalent circuit modeling, electromagnetic full wave simulations, and practical measurement. The results illustrate the filter has dual passbands centered at 0.82 and 1.48 GHz with approximately 1 dB insertion loss and minimum 12 dB return loss. Good agreements between the circuit modeling, electromagnetic full wave simulations, and practical measurements are achieved. Moreover, the filter size is only (18 × 28 mm²) which is only less than (0.2λ_g × 0.31λ_g) at the center frequency of the first passband and (0.36λ_g × 0.56λ_g) at the center frequency of the second passband.

Keywords:

• dual-band
• generalized NRI
• metamaterial
• band pass filter

Disclosure statement

The authors did not have any commercial interest in any of the materials used in this study.