| 摘要 |
PURPOSE:To reduce the radiation loss, dielectric loss and variation in the performance by giving a difference of height between an input/output part and a coupling part of a main line and a sub line, supporting the input/output part to a metallic case mechanically and making the interval of the coupling parts adjastable externally. CONSTITUTION:A main line 10 of a modified Z-shape where a coupling part 103 of lambda/4 length and input/output parts 101, 102 on a plane in parallel with a plane including the coupling part and having a predetermined interval therewith are connected in opposite directions to each other so as to be nearly orthogonal near both ends of the coupling part in view of the plane, and a sub line 10' of the same shape as the main line 10 are formed, and the main line 10 and the sub line 10' are arranged so that the input/output parts 101, 102, 101' and 102' are symmetrical to the coupling part in opposing the coupling parts 103, 103' of both the lines at a prescribed interval in a space enclosed by a metallic case 12 and a cover 14, and the input/ output parts are supported mechanically by dielectric bases 6, 7, 8, 9 or the like provided to the cash and the cover. Coupling degree adjusting holes 15, 16 are provided to the cover 14. Through the constitution above. a dielectric substance used conventionally between the lines 10, 10' is not required and the degree of coupling is easily adjusted.
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