JPH02126413U

JPH02126413U -

Info

Publication number: JPH02126413U
Application number: JP3499389U
Authority: JP
Priority date: 1989-03-28
Filing date: 1989-03-28
Publication date: 1990-10-18

Description

[Brief explanation of drawings]

第１図は本考案の一実施例の断面図、第２図は
同上の構造と高周波的に等価的な構造を示す断面
図、第３図は従来例の斜視図、第４図ａは他の従
来例の斜視図、第４図ｂは同上の断面図、第５図
乃至第７図は同上の動作説明のための断面図、第
８図ａは従来のアンテナの取り付け構造を示す断
面図、同図ｂは同上のアンテナ放射パターンを示
す図、第９図ａは従来の他のアンテナの取り付け
構造を示す断面図、同図ｂ乃至ｄは同上のアンテ
ナ放射パターンを示す図、第１０図は同上のアン
テナと等価な構造を示す断面図、第１１図は従来
の車載用アンテナの自動車ボデイへの取り付け態
様を示す説明図、第１２図は増幅回路を一体化し
た従来の車載用アンテナの断面図、第１３図乃至
第１５図は同上の自動車ボデイへの取り付け構造
を示す断面図である。１は放射素子面、２は誘電体基板、３はグラン
ド面、４は回路部、５はシールドケース、６は金
属構造体である。 Fig. 1 is a sectional view of one embodiment of the present invention, Fig. 2 is a sectional view showing a structure equivalent to the above structure in terms of high frequency, Fig. 3 is a perspective view of a conventional example, and Fig. 4a is another example. 4b is a sectional view of the same as above, FIGS. 5 to 7 are sectional views for explaining the operation of the above, and FIG. 8a is a sectional view of the conventional antenna mounting structure. , FIG. 9b is a diagram showing the radiation pattern of the same antenna as above, FIG. 9a is a sectional view showing another conventional antenna mounting structure, FIGS. is a sectional view showing a structure equivalent to the above antenna, Fig. 11 is an explanatory diagram showing how a conventional in-vehicle antenna is attached to an automobile body, and Fig. 12 is a diagram showing a conventional in-vehicle antenna with an integrated amplifier circuit. 13 to 15 are cross-sectional views showing the structure for attaching the same to the automobile body. 1 is a radiation element surface, 2 is a dielectric substrate, 3 is a ground plane, 4 is a circuit section, 5 is a shield case, and 6 is a metal structure.

Claims

[Claims for Utility Model Registration] (1) A microstrip having a structure in which the upper surface of a dielectric substrate has a radiating element surface made of metal foil that resonates at a desired frequency, and the lower surface has a ground surface made of metal foil. What is claimed is: 1. A vehicle-mounted antenna, characterized in that the antenna comprises a circuit section and its shield case below the ground surface, and the size of the shield case is at least larger than the ground surface of the antenna. (2) Claim 1 characterized in that the distance from the bottom surface of the shield case to the metal structure to which the antenna is attached is approximately 1/30 or less of the wavelength of the frequency used.
In-vehicle antenna listed. (3) The vehicle-mounted antenna according to claim 2, wherein the metal structure to which the antenna is attached is a vehicle body.