Branching device
AssigneeMurata Manufacturing Co., Ltd.
InventorKunitoshi Hanaoka
Life of this patent
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Abstract
In a branching device, an LPF includes a first inductor arranged such that some conductor layers from among conductor layers are wound in a clockwise direction, and a second inductor arranged such that a conductor layer from among the conductor layers is wound in an counterclockwise direction. In addition, an HPF includes a third inductor arranged such that conductor layers are wound in the same clockwise direction as the first inductor. Therefore, when a high-frequency signal passes through the LPF, a winding direction is reversed. In addition, when a high-frequency signal passes through the HPF, a winding direction is reversed.
Claims9
A branching device comprising:
- an antenna terminal arranged to be connected to an antenna;
- at least two signal terminals;
- a first LC filter circuit connected between the antenna terminal and each of the at least two signal terminals and arranged to allow a signal in a first frequency band from among signals input from one of the antenna terminal and the at least two signal terminals to pass therethrough;
- and
- a second LC filter circuit connected between the antenna terminal and each of the at least two signal terminals and arranged to allow a signal in a second frequency band from among signals input from one of the antenna terminal and the at least two signal terminals to pass therethrough;
- wherein
- the first LC filter circuit and the second LC filter circuit are provided in a laminated substrate in which a dielectric layer on which a conductor pattern is provided is laminated;
- the first LC filter circuit includes a first inductor arranged such that a portion of a first coil conductor defined by the conductor pattern is wound in a predetermined direction, and a second inductor arranged such that a remaining portion of the first coil conductor defined by the conductor pattern is wound in a direction opposite to the predetermined direction;
- the second LC filter circuit includes a third inductor arranged such that a second coil conductor defined by the conductor pattern is wound in the predetermined direction;
- and
- at least a portion of the third inductor is disposed on the same dielectric layer as the second inductor.
A branching device comprising:
- an antenna terminal arranged to be connected to an antenna;
- at least two signal terminals;
- a first LC filter circuit connected between the antenna terminal and each of the at least two signal terminals and arranged to allow a signal in a first frequency band from among signals input from one of the antenna terminal and the at least two signal terminals to pass therethrough;
- and
- a second LC filter circuit connected between the antenna terminal and each of the at least two signal terminals and arranged to allow a signal in a second frequency band from among signals input from one of the antenna terminal and the at least two signal terminals to pass therethrough;
- wherein
- the first LC filter circuit and the second LC filter circuit are provided in a laminated substrate in which a dielectric layer on which a conductor pattern is provided is laminated;
- the first LC filter circuit includes a first inductor arranged such that a portion of a first coil conductor defined by the conductor pattern is wound in a predetermined direction, and a second inductor arranged such that a remaining portion of the first coil conductor defined by the conductor pattern is wound in a direction opposite to the predetermined direction;
- the second LC filter circuit includes a third inductor arranged such that a second coil conductor defined by the conductor pattern is wound in the predetermined direction;
- and
- an inductance of the second inductor is less than an inductance of the first inductor.
Dependencies are inferred from the claim text.