WIDEBAND BALUN BY USING COUPLED RESONATORS AND ITS FABRICATION METHODS

摘要

A broadband balun capable of improving integration by reducing the number of unit device and a manufacturing method thereof are provided to ideally maintain strength of a signal and a phase difference between balanced terminals by using a coupling of a resonator. A broadband balun comprises a first inductor(L1), a second inductor(L2), and a third inductor(L3). The first inductor is connected to an unbalanced terminal(P1). The second inductor and the third inductor are connected to balanced terminals(P2, P3). A direction of the first inductor is opposite direction of the second inductor, and is identical to direction of the third inductor. The first inductor, the second inductor, and the third inductor form a magnetic coupling. The balun is manufactured by a MMIC(Monolithic Microwave Integrated Circuit) technology or a LTCC(Low Temperature Co-fired Ceramic) technology.