JPH03409U

JPH03409U -

Info

Publication number: JPH03409U
Application number: JP6133189U
Authority: JP
Priority date: 1989-05-26
Filing date: 1989-05-26
Publication date: 1991-01-07

Description

[Brief explanation of drawings]

第１図はこの考案の一実施例による双円錐アン
テナの断面図、第２図は第１図の寸法等を示した
説明図、第３図は第２図の同軸給電線路の断面図
、第４図は第２図の円錐導体の中空円形の内面と
内導体で構成された同軸線路の断面図、第５図は
本考案の他の実施例を示す図、第６図は従来の双
円錐アンテナの断面図、第７図は第６図の同軸給
電線路の断面図、第８図は第６図の寸法等を示し
た説明図、第９図は双円錐アンテナの入力抵抗、
入力リアクタンス及び特性インピーダンスと波長
及び距離の関係を示す特性例を示す図である。１……円錐ホーン、１ａ，１ｂ……円錐導体、
２……同軸給電線路、２ａ……外導体、２ｂ……
内導体、２ｃ……誘電体、３……同軸接栓、４…
…レドーム、５……取付けねじ、６……円錐ホー
ン、６ａ……円錐導体、６ｂ……グランド板であ
る。なお図中同一符号は同一又は相当部分を示す
。 Fig. 1 is a sectional view of a biconical antenna according to an embodiment of the invention, Fig. 2 is an explanatory diagram showing the dimensions of Fig. 1, and Fig. 3 is a sectional view of the coaxial feed line of Fig. 2. Figure 4 is a cross-sectional view of a coaxial line composed of the hollow circular inner surface and inner conductor of the conical conductor shown in Figure 2, Figure 5 is a diagram showing another embodiment of the present invention, and Figure 6 is a diagram showing a conventional biconical line. 7 is a sectional view of the coaxial feed line of FIG. 6, FIG. 8 is an explanatory diagram showing the dimensions of FIG. 6, and FIG. 9 is the input resistance of the biconical antenna.
FIG. 3 is a diagram illustrating a characteristic example showing the relationship between input reactance and characteristic impedance, wavelength, and distance. 1... Conical horn, 1a, 1b... Conical conductor,
2... Coaxial feed line, 2a... Outer conductor, 2b...
Inner conductor, 2c...dielectric, 3...coaxial connector, 4...
...Radome, 5...Mounting screw, 6...Conical horn, 6a...Conical conductor, 6b...Ground plate. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims

[Claim for Utility Model Registration] In a biconical antenna composed of a coaxial feed line and a conical horn made up of two conical conductors, the diameter of the outer conductor of the coaxial feed line changes in two steps, and the above A biconical antenna characterized in that a dielectric material is provided in the first stage and an air layer is provided in the second stage between the outer conductor and the inner conductor.