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This paper presents a new dual-mode microstrip ring bandpass filter (BPF) based on the left-handed transmission line (LH-TL). To achieve dual-mode response, a high impedance LH-TL can easily be realized to perturb a pair of degenerate modes, which difficulty is realized in the conventional dual-mode ring filter. The proposed BPF is designed and fabricated on an FR-4 substrate to suit the 2.45 GHz...
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