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A novel compact microstrip tri-band bandpass filter (BPF) using stub-loaded resonator and λ/4 resonator are proposed in this paper. Three passbands are designed to operate at 1.8/2.4/3 GHz, respectively. The stub-loaded resonators are used to generate the first and third passbands, while the λ/4 resonator is used to generate the second passband. The center frequencies of three passband for the tri-band...
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