A .lamda./2 resonator comprises an inner conductor formed hole having an inner conductor with both open-ends, formed therein, and .lamda./4 resonators comprise inner conductor formed holes having inner conductors with one short-circuited ends and the other open ends, respectively. The resonators are coupled, whereby a terminal electrode connected to the vicinity of the one open end of one of the .lamda./4 resonators functions as an unbalanced terminal, and terminal electrodes connected to both open ends of the .lamda./2 resonator function as balanced terminals.

 
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