US-12620687-B2 - Vehicle-type antenna

US12620687B2US 12620687 B2US12620687 B2US 12620687B2US-12620687-B2

Abstract

A vehicle-type-antenna-device includes: a dielectric plate for a vehicle; and an antenna attached to the dielectric-plate; wherein the antenna includes: a dielectric-layer disposed along a curved-surface of the dielectric-plate, a conductive-layer laminated on the dielectric-layer and having a planar-pattern formed thereon, a feeding portion electrically connected to the planar-pattern, and an electronic-component electrically connected to the conductive-layer and having a higher rigidity than a combined rigidity of the dielectric-layer and the conductive-layer, wherein a curved-region of the dielectric-plate is defined as an extent to which the dielectric-layer-is attached to the curved-surface includes a first-curved line having a smallest radius-of-curvature in the curved-region and a second-curved line intersecting the first-curved line and having a radius-of-curvature larger than that of the first-curved line, and a longitudinal direction of an extent of the dielectric-plate to which the electronic-component is disposed is a direction along the second-curved line, the extent being a range.

Inventors

Shoichi Takeuchi
Hideaki Shoji
Toshiki SAYAMA
Yusuke Kato

Assignees

AGC Inc.

Dates

Publication Date: 20260505
Application Date: 20240912
Priority Date: 20220317

Claims (20)

1 . A vehicle-type antenna device, comprising: a dielectric plate for a vehicle; and an antenna attached to the dielectric plate; wherein the antenna includes: a dielectric layer disposed along a curved surface of the dielectric plate, a conductive layer laminated on the dielectric layer and having a planar pattern formed thereon, a feeding portion electrically connected to the planar pattern, and an electronic component electrically connected to the conductive layer and having a higher rigidity than a combined rigidity of the dielectric layer and the conductive layer, wherein a curved region of the dielectric plate is defined as an extent to which the dielectric layer is attached to the curved surface includes a first curved line having a smallest radius of curvature in the curved region and a second curved line intersecting the first curved line and having a radius of curvature larger than that of the first curved line, and a longitudinal direction of an extent of the dielectric plate to which the electronic component is disposed is a direction along the second curved line, the extent being a range.
2 . The vehicle-type antenna device according to claim 1 , wherein said electronic component disposed in the range is a plurality of electronic components arranged in the range.
3 . The vehicle-type antenna device according to claim 2 , wherein the plurality of electronic components includes at least two types of electronic components among a resistor, a capacitor, and an inductor.
4 . The vehicle-type antenna device according to claim 1 , wherein a radius of curvature in the feeding portion is larger than a radius of curvature in the range.
5 . The vehicle-type antenna device according to claim 1 , wherein the curved region has a dimension in which a length in a direction along the first curved line is longer than a length in a direction along the second curved line.
6 . The vehicle-type antenna device according to claim 1 , wherein the dielectric layer has a first main surface and a second main surface opposite to the first main surface, and wherein the conductive layer includes a first conductive layer provided on the first main surface and a second conductive layer provided on the second main surface, and the antenna includes a connecting portion for electrically connecting the first conductive layer and the second conductive layer in a thickness direction of the dielectric layer.
7 . The vehicle-type antenna device according to claim 6 , wherein the first conductive layer is disposed on a side of the dielectric layer where the dielectric plate is, the second conductive layer is arranged on an opposite side of the dielectric layer from the dielectric plate, the planar pattern includes an antenna element pattern formed on the first conductive layer or the second conductive layer, and the feeding portion and the electronic component are arranged over or under the second conductive layer.
8 . The vehicle-type antenna device according to claim 1 , wherein the electronic component disposed in the range is one in number.
9 . The vehicle-type antenna according to claim 1 , wherein the electronic component disposed in the range includes a resistor.
10 . The vehicle-type antenna device according to claim 1 , wherein the radius of curvature of the first curved line is 1,500 mm or more.
11 . The vehicle-type antenna device according to claim 1 , wherein the curved region falls within a rectangular-shaped having a short side thereof that is 50 mm or less in length in plan view.
12 . The vehicle-type antenna device according to claim 1 , wherein the feeding portion has a first feeding portion and a second feeding portion, the planar pattern includes an antenna element pattern having a first antenna element pattern connected to the first feeding portion and has a second antenna element pattern connected to the second feeding portion to be grounded, and the electronic component forms a matching circuit configured to perform impedance matching.
13 . The vehicle-type antenna device according to claim 12 , wherein the matching circuit includes a plurality of said electronic components, and at least one of the plurality of said electronic components is connected between the antenna element pattern and the first feeding portion.
14 . The vehicle-type antenna device according to claim 1 , wherein the antenna has an adhesive layer bonded to the dielectric plate, and the adhesive layer has a thickness of 0.2 mm or more.
15 . The vehicle-type antenna device according to claim 1 , further comprising an antenna module that includes a transmission line, wherein the antenna is an antenna included in the antenna module, and the transmission line is electrically connected to the feeding portion.
16 . The vehicle-type antenna device according to claim 15 , wherein the dielectric layer is a region having a short side that intersects the transmission line in plan view and a long side that is longer than the short side.
17 . The vehicle-type antenna device according to claim 15 , wherein the antenna module has a fixing part configured to fix the transmission line to the dielectric plate.
18 . The vehicle-type antenna device according to claim 17 , wherein the transmission line is connected to the feeding portion by being bent in a direction different from a direction in which the transmission line extends in the fixing part.
19 . The vehicle-type antenna device according to claim 1 , wherein the dielectric plate is a glass plate.
20 . The vehicle-type antenna device according to claim 1 , wherein the antenna transmits or receives radio waves in at least a portion of a frequency band in a range of from 600 MHz to 6 GHz, inclusive.

Description

CROSS-REFERENCE TO RELATED APPLICATION The present application is a continuation application of International Application No. PCT/JP2023/009347, filed Mar. 10, 2023, which claims priority to Japanese Patent Application No. 2022-043209 filed Mar. 17, 2022. The contents of these applications are incorporated herein by reference in their entirety. BACKGROUND OF THE INVENTION 1. Field of the Invention The present disclosure relates to an vehicle-type antenna. 2. Description of the Related Art Conventional, a sheet-type antenna having an antenna element affixed to the surface of a sheet in an appropriate meandering pattern is known as an antenna affixed to a glass surface of a vehicle (See Patent Document 1, for example). In the case where a sheet-type antenna is affixed to the main surface of vehicle-type window glass, if a chip-shaped electronic component having high rigidity is attached to the sheet, there is a possibility that excess stress will get generated in a portion along the curved surface of the window glass. When such stress is generated, there is a possibility that the stability in the attachment of the antenna to the curved face of the window glass will deteriorate or the antenna characteristics will deteriorate. There may be a need to provide a vehicle-type antenna device in which an antenna, on which an electronic component is mounted, is stably attached along the curved surface of a dielectric plate, such as window glass. RELATED-ART DOCUMENTS Patent Documents Patent Document 1: Japanese Utility Model Registration Publication No. 3098997 SUMMARY OF THE INVENTION A vehicle-type antenna device includes: a dielectric plate for a vehicle; andan antenna attached to the dielectric plate;wherein the antenna includes: a dielectric layer disposed along a curved surface of the dielectric plate,a conductive layer laminated on the dielectric layer and having a planar pattern formed thereon,a feeding portion electrically connected to the planar pattern, andan electronic component electrically connected to the conductive layer and having a higher rigidity than a combined rigidity of the dielectric layer and the conductive layer, wherein a curved region of the dielectric plate is defined as an extent to which the dielectric layer is attached to the curved surface includes a first curved line having a smallest radius of curvature in the curved region and a second curved line intersecting the first curved line and having a radius of curvature larger than that of the first curved line, anda longitudinal direction of an extent of the dielectric plate to which the electronic component is disposed is a direction along the second curved line, the extent being a range. According to at least one embodiment of the present disclosure, the vehicle-type antenna in which an antenna, on which an electric component is mounted, is stably attached along the curved surface of the dielectric plate, such as window glass. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram illustrating an example of a vehicle-type antenna device according to a first embodiment; FIG. 2 is a diagram illustrating an example of an antenna module in plan view; FIG. 3 is a view illustrating an example of an antenna module in a bottom view; FIG. 4 is a cross-sectional view for describing an example of a laminated structure of the vehicle-type antenna device according to the first embodiment; FIG. 5 illustrates an example of a planar pattern formed on a first conductive layer in plan view; FIG. 6 illustrates an example of a planar pattern formed on the second conductive layer in plan view; FIG. 7 illustrates an example of each simulation result of a planar antenna in the original shape and a planar antenna with a shape reduced in size to 75% of the original shape, wherein the shape of the planar antenna adapted to 600 MHz to 6 GHz without a matching circuit is the original shape (100%); FIG. 8 is a diagram illustrating a matching circuit during a simulation; FIG. 9 is a diagram illustrating an example of a simulation results of the planar antenna with the matching circuit added; FIG. 10 is a diagram illustrating an example of a matching circuit according to the first embodiment; FIG. 11 is a diagram illustrating an example of measurement results of the VSWR of the vehicle-type antenna device according to the first embodiment, mounted on an actual vehicle; FIG. 12 is a diagram illustrating an example of actual measurement results of the antenna gain of the vehicle-type antenna device according to the first embodiment, mounted on an actual vehicle; FIG. 13 is a diagram illustrating an example of a vehicle-type antenna device according to a second embodiment; FIG. 14 is a diagram illustrating an example of actual measurement results of the antenna gain of a vehicle-type antenna device according to the second embodiment, mounted on an actual vehicle; FIG. 15 is a cross-sectional view for describing an example of the laminated structure of a