BALANCED-TO-UNBALANCED TRANSFORMER CIRCUIT AND MULTILAYER BALANCED-TO-UNBALANCED TRANSFORMER

摘要

PROBLEM TO BE SOLVED: To provide a balanced-to-unbalanced transformer circuit and a multilayer balanced-to-unbalanced transformer which can deliver large attenuation for spurious suppression and large attenuation around a pass band with a small size.;SOLUTION: A balanced-to-unbalanced transformer circuit 21 has strip lines 22 to 25 having 1/4 wavelength. Further, an end 22a connected to a balanced terminal 26 of the strip line 22 and an end 24a connected to an unbalanced terminal 28 of the strip line 24 face each other and the strip lines 22 and 24 are electromagnetically coupled to each other so as to constitute a coupler. Similarly, an end 23a connected to a balanced terminal 27 of the strip line 23 and an end 25a connected to an open terminal 29 of the strip line 25 face each other and the strip lines 23 and 25 are electromagnetically coupled to each other so as to constitute a coupler.;COPYRIGHT: (C)2004,JPO&NCIPI