A dual-passband filter architecture for dual-band systems

This paper proposes a novel dual-passband filter based on a Chebyshev filter architecture. The two passbands can be independently tuned to desired frequencies. Also, the filter has the ability to provide matching to impedances with high real values at both frequencies which was impossible in previous design methodologies. This novel feature eliminates the need for further impedance matching through using quarter-wave transformers. The architecture is specifically attractive when matching to dual-resonating loads in dual-band systems. The measured results approve that the proposed method can achieve matching at both desired frequencies.