US-12620975-B2 - Electronic component

US12620975B2US 12620975 B2US12620975 B2US 12620975B2US-12620975-B2

Abstract

An electronic component includes a first main body and a second main body mounted on the first main body. The first main body includes a common terminal, a second signal terminal, and a circuit section including first to fourth inductors. The second main body includes first to third acoustic wave elements electrically connected to the circuit section. The first acoustic wave element is connected in parallel with the first inductor. The second acoustic wave element is connected in parallel with the second and third inductors. The third acoustic wave element is connected in parallel with the fourth inductor. The first to third acoustic wave elements, in a state of being electrically connected to the circuit section, are not electrically connected to the ground.

Inventors

Takuya Sato

Assignees

TDK CORPORATION

Dates

Publication Date: 20260505
Application Date: 20240201
Priority Date: 20230214

Claims (10)

1 . An electronic component comprising: a first main body including a plurality of dielectric layers stacked together; and a second main body mounted on the first main body, wherein the first main body includes a common terminal, at least one signal terminal, and a circuit section provided between the common terminal and the at least one signal terminal, in a circuit configuration, the circuit section includes at least one inductor, the second main body includes at least one acoustic wave element that is electrically connected to the circuit section and that is connected in parallel with the at least one inductor, the at least one acoustic wave element, in a state of being electrically connected to the circuit section, is not electrically connected to a ground, no other acoustic wave element is disposed between the at least one acoustic wave element and the ground, in the circuit configuration, and the first main body further includes a high-pass filter circuit connected to the circuit section in series.
2 . The electronic component according to claim 1 , wherein the at least one inductor includes a plurality of inductors, and the at least one acoustic wave element includes a plurality of acoustic wave elements.
3 . The electronic component according to claim 2 , wherein the plurality of inductors are electrically connected in series, and the plurality of acoustic wave elements are electrically connected in series.
4 . The electronic component according to claim 2 , wherein the plurality of acoustic wave elements include a specific acoustic wave element, and the circuit section further includes a first capacitor provided between one end of the specific acoustic wave element and the ground, and a second capacitor provided between another end of the specific acoustic wave element and the ground.
5 . The electronic component according to claim 1 , wherein the high-pass filter circuit is provided between the common terminal and the circuit section, in the circuit configuration.
6 . The electronic component according to claim 1 , wherein the at least one signal terminal includes a first signal terminal and a second signal terminal, the electronic component further includes a first filter provided between the common terminal and the first signal terminal in the circuit configuration and a second filter provided between the common terminal and the second signal terminal in the circuit configuration, and the second filter includes the circuit section and the at least one acoustic wave element.
7 . The electronic component according to claim 6 , wherein the first filter selectively passes a signal of a frequency within a first passband, and the second filter selectively passes a signal of a frequency within a second passband higher than the first passband.
8 . The electronic component according to claim 1 , wherein the second main body further includes at least one other acoustic wave element not provided between the common terminal and the at least one signal terminal in the circuit configuration.
9 . The electronic component according to claim 8 , wherein the at least one other acoustic wave element has both ends short-circuited.
10 . An electronic component comprising: a first main body including a plurality of dielectric layers stacked together; and a second main body mounted on the first main body, wherein the first main body includes a common terminal, at least one signal terminal, and a circuit section provided between the common terminal and the at least one signal terminal, in a circuit configuration, the circuit section includes at least one inductor, the second main body includes at least one acoustic wave element that is electrically connected to the circuit section and that is connected in parallel with the at least one inductor, the at least one acoustic wave element, in a state of being electrically connected to the circuit section, is not electrically connected to a ground, the at least one acoustic wave element includes a specific acoustic wave element, the circuit section further includes a first capacitor provided between one end of the specific acoustic wave element and the ground, and a second capacitor provided between another end of the specific acoustic wave element and the ground, and the first main body further includes a high-pass filter circuit connected to the circuit section in series.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of Japanese Priority Patent Application No. 2023-21173 filed on Feb. 14, 2023, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component with a second main body mounted on a first main body. 2. Description of the Related Art Compact mobile communication apparatuses are generally configured to use a single common antenna for a plurality of applications that use different systems and have different service frequency bands, and to use a branching filter to separate a plurality of signals received and transmitted by the antenna from each other. A branching filter for separating a first signal of a frequency within a first frequency band and a second signal of a frequency within a second frequency band higher than the first frequency band from each other typically includes a common port, a first signal port, a second signal port, a first filter provided in a first signal path leading from the common port to the first signal port, and a second filter provided in a second signal path leading from the common port to the second signal port. As the filters, an LC filter configured using an inductor and a capacitor, and an acoustic wave filter configured using an acoustic wave element are known. For example, JP 2009-296167 A1 discloses a filter including a plurality of surface acoustic wave (SAW) resonators. This filter is provided with a plurality of SAW resonators each having one end connected to the ground. Here, it is considered that one of two filters included in a branching filter is configured using an LC filter and the other one is configured using a filter including an acoustic wave element. There has been a demand for downsizing of a branching filter used in a compact communication apparatus in particular. As an LC filter suitable to be downsized, an LC filter using a stack including a plurality of dielectric layers and a plurality of conductor layers stacked together is known. When an LC filter is configured using such a stack, it is possible to mount an acoustic wave element on a top surface of the stack, thus allowing the branching filter to be downsized. When an acoustic wave element is mounted on the top surface of the stack, a plurality of terminals are provided on a bottom surface of the stack. The plurality of terminals include a ground terminal connected to the ground. When the acoustic wave element is designed to be connected to the ground, the acoustic wave element is electrically connected to the ground terminal via inside of the stack. In this case, a path from the acoustic wave element to the ground terminal is relatively long. The longer a path from the acoustic wave element to the ground terminal is, the greater the floating inductance caused by the path is, leading to a problem in that adjustment to achieve a desired characteristic is difficult. SUMMARY OF THE INVENTION An objective of the present invention is to provide an electronic component with a second main body including an acoustic wave element and mounted on a first main body, wherein the electronic component allows a desired characteristic to be easily achieved. An electronic component according to the present invention includes a first main body including a plurality of dielectric layers stacked together and a second main body mounted on the first main body. The first main body includes a common terminal, at least one signal terminal, and a circuit section provided between the common terminal and the at least one signal terminal in a circuit configuration. The circuit section includes at least one inductor. The second main body includes at least one acoustic wave element that is electrically connected to the circuit section and that is connected in parallel with the at least one inductor. The at least one acoustic wave element, in a state of being electrically connected to the circuit section, is not electrically connected to a ground. In the electronic component according to the present invention, the at least one acoustic wave element, in a state of being electrically connected to the circuit section, is not electrically connected to the ground. Thus, the present invention allows a desired characteristic to be easily achieved. Other and further objectives, features, and advantages of the present invention will appear more fully from the following description. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a circuit configuration of an electronic component according to an embodiment of the present invention. FIG. 2 is a perspective view showing the electronic component according to the embodiment of the present invention. FIG. 3 is a perspective view showing a first main body in the embodiment of the present invention. FIG. 4 is a perspective view showing the first main body in the embodiment of the present inventi