Isolator
AssigneeSamsung Electro-Mechanics Co., Ltd.
InventorChang Sik Kim
Life of this patent
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Abstract
An isolator is disclosed, in which a ferromagnetic sheet is placed into a shielding resin case together with garnet ferrite and an internal terminal sheet (with strip lines extending therefrom). Thus the leakage magnetic flux shielding effect is reinforced, and the bulk of the isolator is made compact. The constitution is as follows. That is, the internal terminal sheet (with the strip lines extending therefrom), a garnet ferrite, a plurality of insulating films and a ferromagnetic sheet are inserted into a shielding resin case in the cited order. Further, this structure is inserted into between upper and lower cases, and three dielectric devices and a chip resistor are disposed on a PCB and around the lower case, while a connecting terminal part with input/output terminals connected to the PCB electrodes is formed on the PCB.
Claims10
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, comprising:
- upper and lower cases 180 and 190;
- a ferromagnetic sheet 120 disposed within a shielding case 110, for generating a constant magnetic field owing to an input current;
- an internal terminal sheet 130 having a plurality of strip lines 130′ for being connected to input/output electrode terminals and a ground terminal, and disposed under said ferromagnetic sheet 120 and a garnet ferrite 140, said garnet ferrite 140 being for generating an induced magnetic field;
- and
- said input/output electrode terminals and a chip resistor 160 and three dielectric devices 150a-150c for being connected to said three strip lines 130′ 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 130′ extending therefrom), said shielding case 110 is inserted into 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 said lower metal case 190, and a connecting terminal part 210 having said input/output electrode terminals 170 is formed.
An isolator comprising:
- upper and lower cases 380 and 390;
- a ferromagnetic sheet 320 disposed within a shielding case 310, for generating a constant magnetic field owing to an input current;
- an internal terminal sheet 330 having a plurality of strip lines 330′ for being connected to input/output electrode terminals and to a ground terminal, and disposed under said ferromagnetic sheet 320 and a garnet ferrite 340, said garnet ferrite 340 being for generating an induced magnetic field;
- and
- said input/output electrode terminals and a chip resistor 360 and three dielectric devices 350a-350c for being connected to said three strip lines 330′ of said internal terminal sheet 330,
- wherein said ferromagnetic sheet 320 is inserted into said shielding resin case 310 together with said garnet ferrite 340 and said internal terminal sheet 330 (with said strip lines 330′ extending therefrom) and a plurality of insulating films 420, said shielding case 310 is inserted into a lower metal case 390 (serving as a ground), said three dielectric devices 350a-350c and said chip resistor 360 are installed on a circuit board 400 and around said lower metal case 390, and a connecting terminal part 410 having said input/output electrode terminals 370 is formed.
Dependencies are inferred from the claim text.