US-12627079-B2 - Antenna device and antenna module

US12627079B2US 12627079 B2US12627079 B2US 12627079B2US-12627079-B2

Abstract

An antenna device includes: a dielectric layer; radiation conductors provided to the dielectric layer; and a plurality of columnar conductors disposed around the radiation conductor in plan view seen from a normal direction of the radiation conductor, and peripheral conductors are disposed on an outer side of the plurality of columnar conductors in plan view seen from the normal direction.

Inventors

Kenichi Tezuka
Yasuharu Miyauchi
Yousuke Futamata
Misaki Tabata

Assignees

TDK CORPORATION

Dates

Publication Date: 20260512
Application Date: 20240328
Priority Date: 20230331

Claims (11)

1 . An antenna device comprising: a dielectric layer; a radiation conductor provided to the dielectric layer; and a plurality of columnar conductors disposed around the radiation conductor in plan view seen from a normal direction of the radiation conductor, wherein a peripheral conductor is disposed on an outer side of the plurality of columnar conductors in plan view seen from the normal direction, and the peripheral conductor has a first edge on a lower side in the normal direction and a second edge on a higher side in the normal direction, the first edge being between the second edge and a bottom surface of the dielectric layer on the lower side in the normal direction, the first edge being spaced away from and located above the bottom surface of the dielectric layer in the normal direction.
2 . The antenna device according to claim 1 , wherein the plurality of columnar conductors includes a plurality of first columnar conductors disposed between a first end part of the dielectric layer in a first direction and the radiation conductor, and a plurality of second columnar conductors disposed between a second end part of the dielectric layer in a second direction perpendicular to the first direction, and the radiation conductor, a first distance between the plurality of first columnar conductors and the first end part of the dielectric layer is shorter than a second distance between the plurality of second columnar conductors and the second end part of the dielectric layer, and the peripheral conductor is disposed on the outer side of the plurality of first columnar conductors in plan view seen from the normal direction.
3 . The antenna device according to claim 2 , wherein the peripheral conductor is disposed on the outer side of each of the plurality of first columnar conductors on one side in the first direction and the plurality of first columnar conductors on an other side in the first direction.
4 . The antenna device according to claim 2 , wherein the peripheral conductor has two edges in the second direction, and both edges of the peripheral conductor in the second direction are located on an inner side of the columnar conductors located at both ends of the plurality of first columnar conductors in the second direction.
5 . The antenna device according to claim 1 , wherein the peripheral conductor is disposed on a side surface of the dielectric layer that expands along the normal direction of the radiation conductor.
6 . The antenna device according to claim 1 , wherein an upper surface conductor coupled with the peripheral conductor is disposed on the outer side of the plurality of columnar conductors and on a top surface of the dielectric layer on an upper side in the normal direction in plan view seen from the normal direction of the radiation conductor.
7 . The antenna device according to claim 1 , wherein the dielectric layer includes an antenna layer in which a power feeding conductor coupled with the radiation conductor is disposed, a filter layer including a conductor pattern, and a distribution layer disposed between the antenna layer and the filter layer, and the first edge of the peripheral conductor overlaps the distribution layer on a side surface of the dielectric layer that expands along the normal direction of the radiation conductor.
8 . The antenna device according to claim 7 , further comprising a ground conductor between the antenna layer and the distribution layer, wherein the peripheral conductor is not connected with the ground conductor.
9 . The antenna device according to claim 2 , wherein the radiation conductor includes first and second radiation conductors disposed side by side in the second direction, the peripheral conductor includes a first peripheral conductor located on an outer side of the plurality of first columnar conductors disposed around the first radiation conductor, and a second peripheral conductor located on an outer side of the plurality of first columnar conductors disposed around the second radiation conductor, and the first peripheral conductor and the second peripheral conductor are spaced away from each other.
10 . An antenna module comprising a plurality of the antenna devices according to claim 1 , wherein the plurality of antenna devices includes a first antenna device and a second antenna device, and the peripheral conductor of the first antenna device and the peripheral conductor of the second antenna device are disposed to face each other.
11 . An antenna device comprising: a dielectric layer; a radiation conductor provided to the dielectric layer; and a plurality of columnar conductors disposed around the radiation conductor in plan view seen from a normal direction of the radiation conductor, wherein a peripheral conductor is disposed on an outer side of the plurality of columnar conductors in plan view seen from the normal direction, the dielectric layer includes an antenna layer in which a power feeding conductor coupled with the radiation conductor is disposed, a filter layer including a conductor pattern, and a distribution layer disposed between the antenna layer and the filter layer, and an edge of the peripheral conductor on a lower side in the normal direction of the radiation conductor overlaps the distribution layer on a side surface of the dielectric layer that expands along the normal direction of the radiation conductor.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims priority to Japanese Patent Application No. 2023-057869 filed on Mar. 31, 2023, the entire contents of which are incorporated by reference herein. TECHNICAL FIELD The present disclosure relates to an antenna device and an antenna module. BACKGROUND Conventionally, there is known an antenna device described in International Publication WO 2019/054094 A as antenna devices. This antenna device includes radiation conductors disposed inside a dielectric layer and a plurality of columnar conductors disposed around the radiation conductor. SUMMARY An antenna device according to one aspect of the present disclosure includes: a dielectric layer; a radiation conductor provided to the dielectric layer; and a plurality of columnar conductors disposed around the radiation conductor in plan view seen from a normal direction of the radiation conductor, and a peripheral conductor is disposed on an outer side of the plurality of columnar conductors in plan view seen from the normal direction. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic perspective view illustrating the external appearance of an antenna device according to an embodiment of the present disclosure; FIG. 2 is a schematic perspective view illustrating the external appearance of the antenna device according to the embodiment of the present disclosure; FIG. 3 is a schematic view for describing an internal structure of the antenna device according to the present embodiment; FIG. 4 is a schematic perspective view illustrating a state where dielectric layers are removed from the antenna device; FIG. 5 is a plan view illustrating an antenna module; FIGS. 6A to 6C are views each illustrating the antenna device; FIGS. 7A to 7C are graphs showing simulation results; FIGS. 8A to 8C are views each illustrating an antenna device according to a comparative example; FIGS. 9A to 9C are graphs showing simulation results; FIGS. 10A to 10C are views each illustrating an antenna device according to a modification; FIGS. 11A to 11C are graphs showing simulation results; FIGS. 12A to 12C are views each illustrating the antenna device according to the modification; FIGS. 13A to 13C are graphs showing simulation results; FIG. 14 is a view illustrating the antenna device according to the modification; FIGS. 15A to 15C are graphs showing simulation results; FIG. 16 is a view illustrating the antenna device according to the modification; FIGS. 17A to 17C are graphs showing simulation results; FIG. 18 is a view illustrating the antenna device according to the modification; FIGS. 19A to 19C are graphs showing simulation results; FIG. 20 is a view illustrating the antenna device according to the modification; and FIGS. 21A to 21C are graphs showing simulation results; FIG. 22 is a view illustrating the antenna device according to the modification; and FIGS. 23A to 23C are graphs showing simulation results. DETAILED DESCRIPTION Here, the above-described antenna device has been required to improve radiation efficiency of signals to be radiated from the radiation conductors. It is therefore an object of the present disclosure is to provide an antenna device that can improve radiation efficiency, and an antenna module. According to one aspect of the present disclosure, it is possible to provide an antenna device that can improve radiation efficiency, and an antenna module. Hereinafter, an embodiment of the present disclosure will be described in detail. However, the present disclosure is not limited to the following embodiment. FIG. 1 is a schematic perspective view illustrating the external appearance of an antenna device 1 according to the embodiment of the present disclosure, and illustrates a state seen from a radiation surface side. FIG. 2 is a schematic perspective view illustrating the external appearance of the antenna device 1 according to the embodiment of the present disclosure, and illustrates a state seen from a mounting surface side. FIG. 3 is a schematic view for describing the internal structure of the antenna device 1, and schematically illustrates a state where the antenna device 1 is mounted on a motherboard 5. FIG. 4 is the schematic perspective view illustrating a state where dielectric layers 2 to 4 are removed from the antenna device 1. Hereinafter, the embodiment of the present disclosure will be described in detail with reference to the accompanying drawings. FIGS. 1 and 2 are the schematic perspective views illustrating the external appearance of the antenna device 1 according to the embodiment of the present disclosure, FIG. 1 illustrates the state seen from the radiation surface side, and FIG. 2 illustrates the state seen from the mounting surface side. As illustrated in FIGS. 1 and 2, the antenna device 1 according to the present embodiment includes a dielectric layer 60. The dielectric layer 60 includes the first dielectric layer 2, the second dielectric layer 3, and the third dielectric la