| 摘要 |
A center-electrode assembly ( 13 ) has a configuration in which center electrodes ( 21 ) to ( 23 ) are arranged, in an electrically insulated state, at the upper surface of a circular-plate microwave ferrite ( 20 ). The center electrode ( 21 ) is constituted by a first line conductor ( 21 a) and a second line conductor ( 21 b) which are arranged parallel to each other. The hot ends of the first line conductor ( 21 a) and the second line conductor ( 21 b) have connection portions ( 27 ) and ( 26 ), respectively, and the cold ends are connected to a ground electrode ( 25 ). The first and second line conductors ( 21 a) and ( 21 b) are arranged such that the hot end of the first line conductor ( 21 a) and the cold end of the second line conductor ( 21 b) oppose each other and the cold end of the first line conductor ( 21 a) and the hot end of the second line conductor ( 21 b) oppose each other to cause electromagnetic coupling.
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