JPH0480114U

JPH0480114U -

Info

Publication number: JPH0480114U
Application number: JP12492690U
Authority: JP
Priority date: 1990-11-27
Filing date: 1990-11-27
Publication date: 1992-07-13
Anticipated expiration: 2005-11-27
Also published as: JP2507935Y2

Description

[Brief explanation of the drawing]

第１図は、本考案の一実施例としての円偏波用
ループアンテナの構造を略示する斜視図、第２図
は、第１図のアンテナを平面的に且つ模式的に示
した図、第３図は、第１図のアンテナを断面的に
且つ模式的に示した図、第４図は、第１図のアン
テナにおけるループ上の電流分布を示す図、第５
図は、第４図に示したような電流分布による放射
パターンの実測値を示す図、第６図は、従来の円
偏波用ループアンテナの一例を示す概略図、第７
図は、従来の円偏波用ループアンテナの別の例を
示す概略図、第８図は、円偏波用ループアンテナ
の更に別の例を示す概略図である。１０……誘電体基板、１１……接地板、１２…
…ループ導体、１３，１４……摂動素子、１５…
…Ｌ字形素子、２０……同軸線、２１……中心導
体、２２……外部導体。 1 is a perspective view schematically showing the structure of a circularly polarized loop antenna as an embodiment of the present invention; FIG. 2 is a plan view schematically showing the antenna of FIG. 1; 3 is a cross-sectional and schematic diagram of the antenna of FIG. 1, FIG. 4 is a diagram showing the current distribution on the loop in the antenna of FIG. 1, and FIG.
The figures show actual measured values of the radiation pattern due to the current distribution as shown in Fig. 4. Fig. 6 is a schematic diagram showing an example of a conventional circularly polarized loop antenna.
This figure is a schematic diagram showing another example of a conventional circularly polarized loop antenna, and FIG. 8 is a schematic diagram showing still another example of a circularly polarized loop antenna. 10... Dielectric substrate, 11... Ground plate, 12...
...Loop conductor, 13, 14...Perturbation element, 15...
... L-shaped element, 20 ... coaxial line, 21 ... center conductor, 22 ... outer conductor.

Claims

[Claims for Utility Model Registration] (1) A grounding plate and a loop conductor having a perturbation element so as to radiate circularly polarized waves are faced to each other with a dielectric material in between, and an L-shaped element extending over a predetermined distance;
In a circularly polarized loop antenna in which a center conductor of a feeding coaxial line is connected to the L-shaped element and an outer conductor is connected to the ground plate, the L-shaped element connects the loop conductor and the feeding coaxial line. A loop antenna for circularly polarized waves, characterized in that it is configured to act as an impedance converter between a transmission line and a transmission line. (2) The loop antenna for circularly polarized waves according to claim (1), wherein the thickness of the dielectric is relatively thin, and the width of the L-shaped element is narrower or thicker than the width of the loop conductor.