JPH02164105A - Spiral antenna - Google Patents

Abstract

PURPOSE:To reduce number of components and to improve the mechanical strength by making a pole such as a cylinder or a pyramid wit an optional height with a dielectric, metallizing one side face and one of two bottom faces with plating or vapor-deposition so as to constitute a cavity and forming a spiral conductor line to the remaining bottom face. CONSTITUTION:A current fed from a feeder 2 flows to a conductor line 1 formed incorporatedly onto a dielectric 4 and a radio wave is radiated efficiently from a part in which the circumference of the line 1 corresponds to one wavelength. Moreover, a radio wave radiated downward among radio waves radiated from the conductor line 1 is reflected in a cavity 3 formed incorporatedly with the dielectric 4, synthesized with the radio wave radiated upward, then a high radiation gain is obtained. Thus, the conductor line 1 and the cavity 3 formed incorporatedly with the dielectric 4, although the similar electric function is provided to that of a conventional component, do not required any tightening component such as a screw 6 because of the incorporated structure. Furthermore, since no base 5 is required, the antenna withstands shock and vibrations and the joint between the conductor line 1 and the feeder 2 is strengthened.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a spiral antenna.

[Conventional technology]

Figure 4 is a cross-sectional view of a conventional spiral antenna. In Figure 2, (1) is a conductor line formed by photo etching etc., (2) is a feed line, and (3) is the radiation of radio waves to the rear. cavity to prevent.

(5) is a substrate for holding the conductor line (1), (6)
are screws for fixing the substrate (5) to the cavity (3).

Next, the operation will be explained. A conventional spiral antenna is configured as described above, and the current fed from the feeder line i (21) flows on the conductor line (1), and the radius of the line corresponds to one wavelength in one turn. Furthermore, the radio waves radiated from the conductor line (1) have directivity both above and below the board (5), but the radio waves radiated downward are reversed in the cavity (3) and radiated upward. combined into emitted radio waves.

You can have higher gains.

[Problem to be solved by the invention]

Since the conventional spiral antenna is constructed as described above, screws (6) are required to fix the substrate (5) on which the conductor line fil is etched to the cavity (3). It is difficult to position the feed line (2) and the cavity (3) is hollow, so it is difficult to position the board [5] against environments such as vibration and shock.
) does not have, the conductor line (
There were problems such as the joint between 1) and the feed line (2) being easily broken. Another problem was that the number of two parts was large and the manufacturing time was long.

This invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a spiral antenna with a small number of parts, a short manufacturing time, and excellent mechanical strength.

[Means to solve the problem]

In the spiral antenna according to the present invention, a dielectric material (4) is used to form a cylinder, a prism, or a columnar body having an arbitrary cross section. (3), and a spiral conductor line (1) is formed on the remaining bottom surface.

A spiral antenna according to another invention includes a dielectric (4) forming a cylinder, a prism, or a columnar body having an arbitrary cross section, and a metal cavity (3) slightly smaller than the dielectric (4). The spiral conductor line (1) is connected to the dielectric (4)
It is formed by embedding it before it solidifies.

[For production]

In the spiral antenna of the present invention, the conductor line (1) and the like are integrally formed in the cavity (3) formed of the dielectric material (4), so the number of parts is small and the antenna has excellent mechanical strength. In the spiral antenna in another invention, the cavity (3) and the conductor line (1) are embedded in the dielectric (4) to form an integrated structure, so the number of two parts is reduced, and the mechanical strength is also deteriorated. Since the cavity (3) and conductor line (1) are exposed on the surface, it does not get scratched and has excellent environmental resistance.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, (4) is a dielectric.

The current fed from the feed line (2) flows on the conductor line (1) formed integrally on the dielectric (4), and as in the conventional case, the radius of the line corresponds to one wavelength in one round. Efficiency (can emit radio waves. Also.

Among the radio waves radiated from the conductor line (1), two of the radio waves radiated downward are transmitted through the cavity (4) formed integrally with the dielectric (4).
3) and is combined into radio waves that radiate upward.

Can have high gains. Therefore, the dielectric (4
The conductor ia path (1) and the cavity (
3) has the same electrical functions as the conventional one.

The integrated structure eliminates the need for fastening parts such as screws (6), and also eliminates the need for a board (5), making it resistant to vibrations, shocks, etc., and the joint between the conductor line (1) and feed line (2) is strong. It has the effect of having

Next, another embodiment of the invention will be described with reference to the drawings.

In FIG. 3, (4) is a dielectric. Power feeder line (
2) flows on the conductor line (1) buried in the dielectric (4), and as in the conventional case, the radius of the line is -
Radio waves can be efficiently radiated at a portion corresponding to one wavelength in m. In addition, among the radio waves radiated from the conductor line (1), the radio waves radiated downward are reflected by the cavity (3) buried in the dielectric (4) and combined into the radio waves radiated upward, resulting in a high gain. can have. Therefore, although the conductor line (1) and the cavity (3) buried in the dielectric (4) have the same electrical functions as conventional ones, they have a structure in which they are buried with metal in the dielectric (4). Therefore,
It eliminates the need for conventional fastening parts such as the board (5) and screws (6), is strong against vibrations and shocks, and has no metal exposed on the surface.

It has the effect of not being scratched and having excellent environmental resistance.

〔Effect of the invention〕

As described above, according to the present invention, the conductor line (1) and the cavity (3) are integrated by plating or vapor deposition on the columnar body formed of the dielectric (4), so that the number of parts is reduced to two. This has the effect of providing at least 2 mechanical strength.

In addition, according to another invention, metals such as the conductor line (1) and the cavity (3) are embedded in the columnar dielectric (4), so they can be integrated, the number of parts is small, and the mechanical strength is Since the metal is not exposed on the surface, the conductor line (1) etc. will not be damaged, and there is an effect that '#4 environmental friendliness can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a spiral antenna according to an embodiment of the present invention, FIG. 2 is a plan view, FIG. 3 is a sectional view of a spiral antenna according to another embodiment of the invention, and FIG. 4 is a conventional spiral antenna. FIG. 2 is a cross-sectional view showing a spiral antenna. (1)
is a conductor line, (2) is a feeder line, (3) is a cavity,
(4) is a dielectric, and (5) is a substrate. (6) is a screw. Note that the same reference numerals in the two figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) In a spiral antenna constructed by forming a plurality of spiral conductor lines of arbitrary width on a dielectric substrate by photo-etching or the like, the dielectric has a cylinder or a prism of an arbitrary height or an arbitrary cross section. A spiral antenna characterized in that a columnar body is formed, one of the two bottom surfaces and the entire side surface is metallized by plating or vapor deposition to form a cavity, and a spiral conductor line is formed on the other bottom surface. (2) In a spiral antenna constructed by forming multiple spiral conductor lines of arbitrary width on a dielectric substrate by photo-etching etc., forming a columnar or prismatic column of an arbitrary height or a columnar body with an arbitrary cross section. A metal cavity having one bottom and all sides with a shape slightly smaller than the mold is filled inside the mold, a spiral conductor line is fixed to the other bottom, and a fluid dielectric is filled in the mold. A spiral antenna characterized in that it is formed by solidifying it by drying or heating.