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US 12,744,146 B2Granted
LC filter, multiplexer, high frequency module, and communication device
AssigneeMurata Manufacturing Co., Ltd.
InventorsHiroto Motoyama, Akira Tanaka, Mitsutoshi Imamura
Life of this patent
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Abstract
In an LC filter, a first inductor via, a second inductor via, and a third inductor via define a first inductor, a second inductor, and a third inductor, respectively. A first inductor pattern portion defines a fourth inductor. The first inductor pattern portion is connected to at least one of a first electrode, the first inductor via, and a first capacitor electrode, and a first input/output port. The first capacitor electrode and the third capacitor electrode do not face each other.
Claims30
An LC filter comprising:
- a multilayer body including a plurality of dielectric layers that are laminated;
- a first input/output port provided in the multilayer body;
- a second input/output port provided in the multilayer body and different from the first input/output port;
- a first electrode having a plate shape and provided in a first dielectric layer among the plurality of dielectric layers;
- a second electrode having a plate shape and provided in a second dielectric layer different from the first dielectric layer among the plurality of dielectric layers;
- a first capacitor electrode defining a first capacitor with the second electrode;
- a second capacitor electrode defining a second capacitor with the second electrode;
- a third capacitor electrode defining a third capacitor with the second electrode;
- a first inductor via including a first end connected to the first capacitor electrode, and a second end connected to the first electrode, and defining a first inductor;
- a second inductor via including a third end connected to the second capacitor electrode, and a fourth end connected to the first electrode, and defining a second inductor;
- a third inductor via including a fifth end connected to the third capacitor electrode, and a sixth end connected to the first electrode, and defining a third inductor;
- and
- a first inductor pattern portion defining a fourth inductor;
- wherein
- the first capacitor electrode and the second capacitor electrode define a fourth capacitor;
- the second capacitor electrode and the third capacitor electrode define a fifth capacitor;
- the first inductor pattern portion includes a first end connected to at least one of the first electrode, the first inductor via, and the first capacitor electrode, and a second end connected to the first input/output port;
- and
- the first capacitor electrode and the third capacitor electrode do not face each other.
16 more elements
A multiplexer comprising:
- a first filter defining a low pass filter;
- a second filter to allow a signal in a frequency band higher than a pass band of the first filter to pass through the second filter;
- and
- a multilayer body including a plurality of dielectric layers that are laminated;
- wherein
- the first filter includes:
- a first electrode provided in a first dielectric layer among the plurality of dielectric layers;
- a second electrode provided in a second dielectric layer different from the first dielectric layer among the plurality of dielectric layers, and is a ground electrode;
- a first capacitor electrode defining a first capacitor with the second electrode;
- a second capacitor electrode defining a second capacitor with the second electrode;
- a third capacitor electrode defining a third capacitor with the second electrode;
- a first inductor via including a first end connected to the first capacitor electrode, and a second end connected to the first electrode, and defining a first inductor;
- a second inductor via including a third end connected to the second capacitor electrode, and a fourth end connected to the first electrode, and defining a second inductor;
- a third inductor via including a fifth end connected to the third capacitor electrode, and a sixth end connected to the first electrode, and defining a third inductor;
- and
- a first inductor pattern portion that defines a fourth inductor;
- the second filter includes:
- a first electrode for the second filter provided in the first dielectric layer among the plurality of dielectric layers,
- a second electrode for the second filter provided in the second dielectric layer different from the first dielectric layer among the plurality of dielectric layers, and is a ground electrode;
- a first capacitor electrode for the second filter defining a first capacitor for the second filter with the second electrode for the second filter;
- a second capacitor electrode for the second filter defining a second capacitor for the second filter with the second electrode for the second filter;
- a third capacitor electrode for the second filter defining a third capacitor for the second filter with the second electrode for the second filter;
- a first inductor via for the second filter connected between the first capacitor electrode for the second filter and the first electrode for the second filter, and defining a first inductor for the second filter;
- a second inductor via for the second filter connected between the second capacitor electrode for the second filter and the first electrode for the second filter, and defining a second inductor for the second filter;
- a third inductor via for the second filter connected between the third capacitor electrode for the second filter and the first electrode for the second filter, and defining a third inductor for the second filter;
- a fourth inductor via for the second filter connected between the first electrode for the second filter and the second electrode for the second filter, and defining a fourth inductor for the second filter connected in series to the first inductor for the second filter;
- a fifth inductor via for the second filter connected between the first electrode for the second filter and the second electrode for the second filter, and defining a fifth inductor for the second filter connected in series to the second inductor for the second filter;
- and
- a sixth inductor via for the second filter connected between the first electrode for the second filter and the second electrode for the second filter, and defining a sixth inductor for the second filter connected in series to the third inductor for the second filter, and
- at least one of the fourth inductor via for the second filter, the fifth inductor via for the second filter, and the sixth inductor via for the second filter is disposed in a boundary region between the first filter and the second filter.
27 more elements
Dependencies are inferred from the claim text.