| 摘要 |
An isolator includes center electrodes (51) to (55) coupled at radio frequencies to a ferrite member (41) to which a DC bias magnetic field is applied from a permanent magnet. The electrodes (51) and (53) do not intersect each other. The electrodes (51) and (53) intersect the electrodes (52), (54), and (55) with electrical insulation therebetween. Connection is established so that a magnetic field generated when current flows from one end (51a) to the other end of the electrode (51) and a magnetic field generated when current flows from one end (53a) to the other end of the electrode (53) are in phase and in the same direction. Connection is established so that a magnetic field generated when current flows from one end (52a) to the other end of the electrode(52), a magnetic field generated when current flows from one end (54a) to the other end of the electrode (54), and a magnetic field generated when current flows from one (55a) end to the other end of the electrode(55) are in phase and in the same direction. The one end (51a) of the electrode (51) and the other end (53b) of the electrode (53) define balanced input ports, and the one end (54a) of the electrode (54) defines an unbalanced output port.
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