PURPOSE: To simplify the structure and adjustment by overlapping an inner conductor, a ferrite, a ground conductor and a magnet of two circulators at the input or the output side of a hybrid on and under a magnetic substance and magnetizing them in the same direction simultaneously.

CONSTITUTION: A circulator 41 (42) consisting of an inner conductor 51 (52) and of a ferrite 61 (62), a ground conductor 71 (72) and a magnet 81 (82) are arranged on and under a magnetic substance 10 respectively, the entire assembly is clipped by yokes 91, 92 and contained in a case. A couple of magnetizers 11 arranged on and under the yokes 91, 92 apply magnetization at the same time to form the S (N) pole to the magnet 81 (82). A connector 3a(3b) and a contact 12-1 (12-2) are connected to the inner conductor 51 (52) and the contact 12-1 (12-2) is connected to a strip of the hybrid 2 of a printed circuit board via a support 13-1 (13-2). Thus, number of components is reduced and the adjustment is easily implemented.