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US-12620708-B2 - Antenna device

US12620708B2US 12620708 B2US12620708 B2US 12620708B2US-12620708-B2

Abstract

An antenna device comprising: a ground part; and an antenna provided at an end portion of the ground part, the antenna including a feeding portion and a first element extending from the feeding portion, the antenna supporting at least a first frequency band, wherein the ground part includes an arm portion defined by an outer edge of the ground part and a slit having an open end located at the outer edge and a closed end located inside the ground part, and the feeding portion is provided at the arm portion.

Inventors

  • Takeshi Sampo

Assignees

  • YOKOWO CO., LTD.

Dates

Publication Date
20260505
Application Date
20220615
Priority Date
20210628

Claims (11)

  1. 1 . An antenna device comprising: a ground part; and an antenna provided at an end portion of the ground part, the antenna including a feeding portion and a first element extending from the feeding portion, the antenna supporting at least a first frequency band, wherein the ground part includes an arm portion defined by an outer edge of the ground part and a slit having an open end located at the outer edge and a closed end located inside the ground part, the feeding portion is provided at the arm portion, and the arm portion includes at least one turn in a predetermined direction.
  2. 2 . The antenna device according to claim 1 , wherein the feeding portion is provided at a tip end portion of the arm portion.
  3. 3 . The antenna device according to claim 1 , wherein a total of a length of the arm portion and a length of the first element is substantially a quarter of a wavelength of the first frequency band.
  4. 4 . The antenna device according to claim 1 , wherein a length of the arm portion is equal to or smaller than a length of the first element.
  5. 5 . The antenna device according to claim 1 , wherein the first element includes a third portion coupled with the feeding portion.
  6. 6 . The antenna device according to claim 1 , wherein a cutout portion is formed at the ground part such that the ground part has a region not overlapping with at least part of the first element in a plan view when seen in a direction perpendicular to the ground part.
  7. 7 . An antenna device comprising: a ground part; and an antenna provided at an end portion of the ground part, the antenna including a feeding portion and a first element extending from the feeding portion, the antenna supporting at least a first frequency band, wherein the ground part includes an arm portion defined by an outer edge of the ground part and a slit having an open end located at the outer edge and a closed end located inside the ground part, the feeding portion is provided at the arm portion, the first element further supports a second frequency band higher than the first frequency band, and the antenna device further comprises a filter extending across the slit, the filter being configured to allow a signal in the second frequency band to pass therethrough.
  8. 8 . The antenna device according to claim 7 , wherein the filter is located at a position within a distance of substantially one eighths of a wavelength of the second frequency band from the open end.
  9. 9 . The antenna device according to claim 7 , wherein the filter is a band elimination filter configured to block a signal in the first frequency band from passing therethrough.
  10. 10 . An antenna device comprising: a ground part; and an antenna provided at an end portion of the ground part, the antenna including a feeding portion and a first element extending from the feeding portion, the antenna supporting at least a first frequency band, wherein the ground part includes an arm portion defined by an outer edge of the ground part and a slit having an open end located at the outer edge and a closed end located inside the ground part, the feeding portion is provided at the arm portion, and the first element includes a first portion and a second portion, the first portion and the second portion facing the ground part.
  11. 11 . An antenna device comprising: a ground part; an antenna provided at an end portion of the ground part, the antenna including a feeding portion and a first element extending from the feeding portion, the antenna supporting at least a first frequency band; a second element being part of the ground part, wherein the ground part includes an arm portion defined by an outer edge of the ground part and a slit having an open end located at the outer edge and a closed end located inside the ground part, the feeding portion is provided at the arm portion, the second element is formed in such a manner as to rise relative to the ground part, and the second element is provided so as to be capacitively coupled with the first element.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS The present application is based on PCT filing PCT/JP2022/024015, filed Jun. 15, 2022, which claims priority to Japanese Patent Application No. 2021-106724, filed Jun. 28, 2021, the entire contents of each are incorporated herein by reference. TECHNICAL FIELD The present disclosure relates to an antenna device. BACKGROUND ART PTL 1 discloses an antenna device including a telephone antenna element and an antenna element for GPS/VICS that are provided at the same ground. CITATION LIST Patent Literature [PTL 1] Japanese Patent Application Publication No. 2006-33699 SUMMARY OF INVENTION Technical Problem For example, it may be difficult to ensure the length of an antenna element supporting radio waves in a low frequency band when reducing the size of an antenna device. The present disclosure is directed, for example, to easy achievement of an antenna supporting radio waves in a low frequency band. Others that the present disclosure is directed to will become apparent from the description of the present specification. An aspect of the present disclosure is an antenna device comprising: a ground part; and an antenna provided at an end portion of the ground part, the antenna including a feeding portion and a first element extending from the feeding portion, the antenna supporting at least a first frequency band, wherein the ground part includes an arm portion defined by an outer edge of the ground part and a slit having an open end located at the outer edge and a closed end located inside the ground part, and the feeding portion is provided at the arm portion. According to The above-described aspect of the present disclosure, it is possible to easily achieve an antenna supporting radio waves in a low frequency band. BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a perspective view of an antenna device 100. FIG. 2 is an exploded perspective view of an antenna device 100. FIG. 3 is a perspective view illustrating an antenna device 100 from which a holder 20 and a patch antenna 60 are omitted. FIG. 4 is a plan view illustrating an antenna device 100 from which a holder 20 and a patch antenna 60 are omitted. FIG. 5 is a plan view of a ground part 10 at which a substrate 80 is provided. FIG. 6A is an enlarged plan view of a substrate 80 of a ground part 10 and the surroundings thereof. FIG. 6B is an explanatory diagram illustrating a filter 81 as a band elimination filter. FIG. 7A is a diagram illustrating an antenna device 100. FIG. 7B is a diagram illustrating an antenna device 100X. FIG. 7C is a diagram illustrating an antenna device 100Y. FIG. 8 is a graph illustrating an example of the frequency characteristics of an antenna device 100, an antenna device 100X, and an antenna device 100Y. FIG. 9A is a diagram illustrating a first modification of an arm portion 11 and a slit 70 of a ground part 10. FIG. 9B is a diagram illustrating a second modification of an arm portion 11 and a slit 70 of a ground part 10. FIG. 9C is a diagram illustrating a third modification of an arm portion 11 and a slit 70 of a ground part 10. DESCRIPTION OF EMBODIMENTS At least following matters will become apparent from the descriptions of the present specification and the accompanying drawings. Preferred embodiments of the present disclosure will be described below with reference to the drawings. The same or equivalent constituent elements, members, and the like illustrated in the drawings are given the same reference signs, and repetitive description thereof is omitted for convenience. ==Antenna Device 100== <<Overview>> First, an overview of the configuration of an antenna device 100 will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view of the antenna device 100. FIG. 2 is an exploded perspective view of the antenna device 100. FIG. 3 is a perspective view illustrating the antenna device 100 from which a holder 20 and a patch antenna 60 are omitted. FIG. 4 is a plan view illustrating the antenna device 100 from which the holder 20 and the patch antenna 60 are omitted. Note that, in FIGS. 3 and 4, the holder 20 and the patch antenna 60 are omitted from the antenna device 100, in order to briefly illustrate a ground part 10, a TEL antenna 30 (a first antenna), and a TEL antenna 50 (a second antenna) (both will be described later) constituting part of the components of the antenna device 100. In FIG. 1, an X-direction is the direction in which the TEL antenna 30 and the patch antenna 60 are arranged. Further, a +X-direction is the direction from the TEL antenna 30 toward the patch antenna 60, and a −X-direction is the direction opposite thereto (from the patch antenna 60 toward the TEL antenna 30). Further, in FIG. 1, a Y-direction is the direction in which the TEL antenna 50 and the patch antenna 60 are arranged. Further, a +Y-direction is the direction from the TEL antenna 50 toward the patch antenna 60, and a −Y-direction is the direction opposite thereto (from the patch antenna 6