US-12627057-B2 - Electronic device and multilayer substrate

Abstract

A first radiation conductor layer is provided in a multilayer body. A second radiation conductor layer is provided in or on the multilayer body, is located above the first radiation conductor layer, and overlaps the first radiation conductor layer when viewed in an up-down direction. A first floating conductor has a shape surrounding at least a part of a periphery of the first radiation conductor layer when viewed in the up-down direction, is located on a same layer as or above the first radiation conductor layer and on a same layer as or below the second radiation conductor layer in the up-down direction, and is not electrically connected to any conductor present in or on the multilayer body. A second floating conductor has a shape surrounding at least a part of a periphery of the second radiation conductor layer.

Inventors

• Kentaro KAWABE

Assignees

• MURATA MANUFACTURING CO., LTD.

Dates

Publication Date

20260512

Application Date

20241218

Priority Date

20220623

Claims (20)

1. 1 . An electronic device comprising: a multilayer substrate; and a second floating conductor, wherein the multilayer substrate comprises: a multilayer body having a structure in which a plurality of insulator layers is stacked in an up-down direction; a first radiation conductor layer provided in the multilayer body; a second radiation conductor layer that is provided in or on the multilayer body, that is located above the first radiation conductor layer, and that overlaps the first radiation conductor layer when viewed in the up-down direction; and a first floating conductor that has a shape surrounding at least a part of a periphery of the first radiation conductor layer when viewed in the up-down direction, that is located on a same layer as or above the first radiation conductor layer and on a same layer as or below the second radiation conductor layer in the up-down direction, and that is not electrically connected to any conductor present in or on the multilayer body, and wherein the second floating conductor is not electrically connected to any conductor present in or on the multilayer body, has a shape surrounding at least a part of a periphery of the second radiation conductor layer when viewed in the up-down direction, and is located above the second radiation conductor layer.
2. 2 . The electronic device according to claim 1 , wherein a frequency of an electromagnetic wave radiated or received by the second radiation conductor layer is higher than a frequency of an electromagnetic wave radiated or received by the first radiation conductor layer; or an area of the second radiation conductor layer is smaller than an area of the first radiation conductor layer.
3. 3 . The electronic device according to claim 2 , wherein the first floating conductor has an annular shape surrounding the periphery of the first radiation conductor layer when viewed in the up-down direction.
4. 4 . The electronic device according to claim 3 , wherein the second floating conductor has an annular shape surrounding the periphery of the second radiation conductor layer when viewed in the up-down direction.
5. 5 . The electronic device according to claim 4 , wherein an opening surrounded by the first floating conductor is contained in an opening surrounded by the second floating conductor when viewed in the up-down direction.
6. 6 . The electronic device according to claim 5 , further comprising: a third radiation conductor layer provided in the multilayer body; and a fourth radiation conductor layer that is provided in or on the multilayer body, that is located above the third radiation conductor layer, and that overlaps the third radiation conductor layer when viewed in the up-down direction, wherein the first floating conductor has a shape surrounding at least a part of the third radiation conductor layer when viewed in the up-down direction, and the second floating conductor has a shape surrounding at least a part of the fourth radiation conductor layer when viewed in the up-down direction.
7. 7 . The electronic device according to claim 6 , wherein the first radiation conductor layer and the second radiation conductor layer each have a diamond shape with diagonal lines extending in a front-back direction and a left-right direction when viewed in the up-down direction.
8. 8 . The electronic device according to claim 7 , wherein the first floating conductor includes one or more interlayer connection conductors passing through one or more of the insulator layers in the up-down direction.
9. 9 . The electronic device according to claim 8 , wherein the first floating conductor includes an upper floating conductor layer located on an upper surface of the multilayer body and a lower floating conductor layer located below the upper floating conductor layer, and the one or more interlayer connection conductors electrically connect the upper floating conductor layer and the lower floating conductor layer.
10. 10 . The electronic device according to claim 9 , wherein the multilayer substrate further comprises a protective layer that has a dielectric constant higher than a dielectric constant of the insulator layers and that covers an upper surface of the multilayer body, and no conductor layer is located on an upper surface of the protective layer.
11. 11 . A multilayer substrate comprising: a multilayer body having a structure in which a plurality of insulator layers is stacked in an up-down direction; a first radiation conductor layer provided in the multilayer body; a second radiation conductor layer that is provided in or on the multilayer body, that is located above the first radiation conductor layer, and that overlaps the first radiation conductor layer when viewed in the up-down direction; a first floating conductor that has a shape surrounding at least a part of the first radiation conductor layer when viewed in the up-down direction, that is located on a same layer as or above the first radiation conductor layer and on a same layer as or below the second radiation conductor layer in the up-down direction, and that is not electrically connected to any conductor present in or on the multilayer body; and a second floating conductor that has a shape surrounding at least a part of the second radiation conductor layer when viewed in the up-down direction, that is located above the second radiation conductor layer, and that is not electrically connected to any conductor present in or on the multilayer body.
12. 12 . The multilayer substrate according to claim 11 , wherein a frequency of an electromagnetic wave radiated or received by the second radiation conductor layer is higher than a frequency of an electromagnetic wave radiated or received by the first radiation conductor layer; or an area of the second radiation conductor layer is smaller than an area of the first radiation conductor layer.
13. 13 . The multilayer substrate according to claim 12 , wherein the first floating conductor has an annular shape surrounding a periphery of the first radiation conductor layer when viewed in the up-down direction.
14. 14 . The multilayer substrate according to claim 13 , wherein the second floating conductor has an annular shape surrounding a periphery of the second radiation conductor layer when viewed in the up-down direction.
15. 15 . The multilayer substrate according to claim 14 , wherein an opening surrounded by the first floating conductor is contained in an opening surrounded by the second floating conductor when viewed in the up-down direction.
16. 16 . The multilayer substrate according to claim 15 , further comprising: a third radiation conductor layer provided in the multilayer body; and a fourth radiation conductor layer that is provided in or on the multilayer body, that is located above the third radiation conductor layer, and that overlaps the third radiation conductor layer when viewed in the up-down direction, wherein the first floating conductor has a shape surrounding at least a part of the third radiation conductor layer when viewed in the up-down direction, and the second floating conductor has a shape surrounding at least a part of the fourth radiation conductor layer when viewed in the up-down direction.
17. 17 . The multilayer substrate according to claim 16 , wherein the first radiation conductor layer and the second radiation conductor layer each have a diamond shape with diagonal lines extending in a front-back direction and a left-right direction.
18. 18 . The multilayer substrate according to claim 17 , wherein the first floating conductor includes one or more interlayer connection conductors passing through one or more of the insulator layers in the up-down direction.
19. 19 . The multilayer substrate according to claim 18 , wherein the first floating conductor includes an upper floating conductor layer located on an upper surface of the multilayer body and a lower floating conductor layer located below the upper floating conductor layer, and the one or more interlayer connection conductors electrically connect the upper floating conductor layer and the lower floating conductor layer.
20. 20 . The multilayer substrate according to claim 19 , further comprising: a protective layer that has a dielectric constant higher than a dielectric constant of the insulator layers and that covers an upper surface of the multilayer body, wherein no conductor layer is located on an upper surface of the protective layer, and the second floating conductor is electrically connected to the first floating conductor.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This is a continuation application of PCT/JP2023/017489, filed on May 9, 2023, designating the United States of America, which is based on and claims priority to Japanese Patent Application No. JP 2022-100859 filed on Jun. 23, 2022. The entire contents of the above-identified applications, including the specifications, drawings and claims, are incorporated herein by reference in their entirety. TECHNICAL FIELD The present disclosure relates to an electronic device and multilayer substrate having a plurality of radiation conductor layers. BACKGROUND ART An antenna device described in Patent Document 1 is known as an disclosure relating to an electronic device in the related art. The antenna device includes a patch antenna, a cushion member, and a metal ring. The cushion member is located above the patch antenna. The metal ring is located above the cushion member. The metal ring has an annular shape when viewed in an up-down direction. The metal ring and the cushion member form a waveguide. Such a configuration improves the directivity of the patch antenna. CITATION LIST Patent Document Patent Document 1: Japanese Patent No. 4569760 SUMMARY OF DISCLOSURE Technical Problem In the antenna device described in Patent Document 1, when the antenna device includes a plurality of patch antennas, there is a desire to improve the directivity of each of the plurality of patch antennas. Therefore, it is a feature of the present disclosure to improve, in an electronic device and a multilayer substrate having a plurality of radiation conductor layers, the directivity of each of the plurality of radiation conductor layers. Solution to Problem An electronic device according to an aspect of the present disclosure includes: a multilayer substrate; anda second floating conductor,in which the multilayer substrate includes: a multilayer body having a structure in which a plurality of insulator layers is stacked in an up-down direction;a first radiation conductor layer provided in the multilayer body;a second radiation conductor layer that is provided in or on the multilayer body, that is located above the first radiation conductor layer, and that overlaps the first radiation conductor layer when viewed in the up-down direction; anda first floating conductor that has a shape surrounding at least a part of a periphery of the first radiation conductor layer when viewed in the up-down direction, that is located on a same layer as or above the first radiation conductor layer and on a same layer as or below the second radiation conductor layer in the up-down direction, and that is not electrically connected to any conductor present in or on the multilayer body, and in which the second floating conductor is not electrically connected to any conductor present in or on the multilayer body, has a shape surrounding at least a part of a periphery of the second radiation conductor layer when viewed in the up-down direction, and is located above the second radiation conductor layer. A multilayer substrate according to an aspect of the present disclosure includes: a multilayer body having a structure in which a plurality of insulator layers is stacked in an up-down direction;a first radiation conductor layer provided in the multilayer body;a second radiation conductor layer that is provided in or on the multilayer body, that is located above the first radiation conductor layer, and that overlaps the first radiation conductor layer when viewed in the up-down direction;a first floating conductor that has a shape surrounding at least a part of the first radiation conductor layer when viewed in the up-down direction, that is located on a same layer as or above the first radiation conductor layer and on a same layer as or below the second radiation conductor layer in the up-down direction, and that is not electrically connected to any conductor present in or on the multilayer body; anda second floating conductor that has a shape surrounding at least a part of the second radiation conductor layer when viewed in the up-down direction, that is located above the second radiation conductor layer, and that is not electrically connected to any conductor present in or on the multilayer body. Advantageous Effects of Disclosure According to the present disclosure, in an electronic device and a multilayer substrate having a plurality of radiation conductor layers, the directivity of each of the plurality of radiation conductor layers can be improved. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is an exploded perspective view of an electronic device 1. FIG. 2 is a cross-sectional view of the electronic device 1 of FIG. 1. FIG. 3 is a transparent view of the electronic device 1 when viewed from above. FIG. 4 is a cross-sectional view of an electronic device 1a. FIG. 5 is an exploded perspective view of a multilayer substrate 10b. FIG. 6 is a cross-sectional view of a multilayer substrate 10c. DESCRIPTION OF EMBODI