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A tunable dual-mode microstrip bandpass filter for mobile GSM and ISM bands (2000 MHz to 2.45 GHz) is proposed and characterized. The structure is composed of a meander loop dual-mode resonator and four loading capacitances. Perturbation of the degenerate modes is achieved by combination of a small square patch and an additional meander line resonator. Frequency tuning is made possible by modifying...
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