Patent ID: 6483394
Filing Date: 2002-11-19
Classification: H01P

Abstract:
An isolator installed between a power amplifier module and an antenna switch, for transmitting output signals of said power amplifier module to said antenna switch, and for absorbing reflected signals from said antenna switch so as to protect said power amplifier module, said isolator comprising:upper and lower cases (180 and 190); a ferromagnetic sheet (120) disposed within a shielding case (110), for generating a constant magnetic field; a garnet ferrite (140) for generating an induced magnetic field; an internal terminal sheet (130) having a plurality of strip lines (130â€²) for connection to input/output electrode terminals (170) and a ground terminal, and disposed under said ferromagnetic sheet (120) and said garnet ferrite (140); and said input/output electrode terminals and a chip resistor (160) and three dielectric devices (150a-150c) being connected to said three strip lines (130â€²) of said internal terminal sheet (130), wherein said ferromagnetic sheet (120) is inserted into said shielding case (110) together with said garnet ferrite (140) and said internal terminal sheet (130) with said strip lines (130â€²) extending therefrom, said shielding case (110) is inserted into said upper and lower metal cases (180 and 190), said three dielectric devices (150a-150c) and said chip resistor (160) are installed on a circuit board (200) and around the outside of said lower metal case (190), and a connecting terminal part (210) having said input/output electrode terminals (170) is formed on the circuit board (200).