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This paper introduces, for the first time, a balanced dual-mode bandpass filter (BPF) using a compact rectangular dielectric resonator (DR), which is directly contact with the bottom of the metal cavity. The idea is to use the bottom metal plate of the cavity to replace the electric wall of the dominant modes, i.e., TEx11 and TEy11, which are orthogonal to each other, of the rectangular DR, so as...
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