JPH04337903A - Antenna - Google Patents

Abstract

PURPOSE:To enable assembly and manufacture with a little man-hour, to reduce the number of equipments and to enable reception over a wide frequency band. CONSTITUTION:A projecting part 3 is provided on the inner face of a housing 1, an antenna element 4 formed by a metal plate is fixed into the housing 1 at the top of the projecting part 3, and a void 5 is formed between the antenna element 4 and the inner face of the housing 1. A ground 6 formed by a metal plate 1 is fitted, fixed into an opening part 2 of the housing 1 and is arranged in counter to the antenna element 4 through a void 7. The antenna can be constituted by integrating the antenna element 4 and the ground 6, which are formed by the metal plates, into the housing 1. The ground 6 formed by the metal plate can be also used as the cover of the housing 1. The width of the void 7 between the antenna element 4 and the ground 6 or the void 5 between the antenna element 4 and the inner face of the housing 1 can be adjusted to be changed by bending the metal plates forming the antenna element 4 and the ground 6 or the like.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin antenna that is installed on a moving object such as an automobile.

0002

2. Description of the Related Art Conventional thin antennas are often constructed using printed wiring boards. That is,
After creating a laminate 12 in which metal foils 11 such as copper foil are laminated on both sides through a lamination molding process, each metal foil 11 is etched to form a pattern, as shown in FIG. 2(a).
), an antenna block A was created in which the antenna element 4 was formed using one metal foil 11 and the ground 6 with a loophole 13 was formed using the other metal foil 11, and a through hole was further formed at the loophole 13. The current collecting pin 14 is processed and attached, and the current collecting pin 14 is connected to the antenna element 4 by soldering or the like. In the antenna block A made of a printed wiring board in which the antenna element 4 and the ground 6 are provided in this manner, a dielectric layer is formed by the laminated plate 12. Then, the coaxial cable 15 is attached to the antenna block A, and the inner conductor 15a of the coaxial cable 15 is connected to the current collecting pin 14 by soldering or the like, and the outer conductor 15b of the coaxial cable 15 is connected to the current collecting pin 14 by soldering or the like.
Connect the antenna block A to the ground 6 by soldering or the like, and attach the antenna block A inside the housing 1 with screws or the like as shown in FIG. 2(b), and then fit the cover plate 16 into the opening 2 of the housing 1 and screw it. An antenna can be constructed by attaching the antenna to the antenna.

0003

[Problems to be Solved by the Invention] However, in the antenna constructed as described above, since the antenna block A incorporated in the housing 1 is formed of a printed wiring board, it is difficult to create the antenna block A by laminating layers. Various processes are required to perform molding and various processes to process printed wiring, and as a result, the total number of man-hours to manufacture the antenna becomes extremely large, resulting in poor productivity and increased costs. It was also true.

The present invention has been made in view of the above points, and can be assembled and manufactured with less man-hours, can reduce the number of parts, and can receive reception in a wide band of frequencies. The purpose is to provide an antenna that can

[0005]

[Means for Solving the Problems] An antenna according to the present invention is provided with a protrusion 3 on the inner surface facing the opening 2 of a housing 1 having one side open, and an antenna element 4 formed of a metal plate is attached to the protrusion 3. is fixed in the housing 1 at the tip of the antenna element 4, and a gap 5 is formed between the antenna element 4 and the inner surface of the housing 1.
A ground 6 formed of a metal plate is fitted into the opening 2 of the housing 1 and fixed, and is arranged opposite to the antenna element 4 with a gap 7 interposed therebetween.

[0006]

[Operation] Since the antenna element 4 and the ground 6 are each made of a metal plate and are assembled into the housing 1 to form the antenna, it is similar to the case where an antenna block made of a printed wiring board is used. The antenna can be manufactured without requiring a large number of man-hours. Furthermore, since the gland 6 formed of a metal plate is fitted and fixed into the opening 2 of the housing 1, the gland 6 can also serve as a lid for the housing 1, and the number of parts can be reduced. Further, the antenna element 4 and the ground 6 are each formed of a metal plate, and the antenna element 4 is fixed in the housing 1 at the tip of the protrusion 3 to form a gap 5 between the antenna element 4 and the inner surface of the housing 1. Since the ground 6 is arranged to face the antenna element 4 through the air gap 7, the widths of the air gaps 5 and 7 are adjusted by bending the metal plates forming the antenna element 4 and the ground 6. By doing so, reception over a wide band of frequencies can be made possible.

[0007]

EXAMPLES The present invention will be explained in detail by way of examples. The housing 1 is made of a resin molded product and has an opening 2 on one side (bottom side).
A rib-shaped protrusion 3 is integrally provided on the inner surface of the housing 1 facing the opening 2 . On the other hand, the antenna element 4 and the ground 6 are each formed of a metal plate such as a copper plate with a thickness of about 0.1 to 0.5 mm, and a current collector pin 14 is provided on the lower surface of the metal plate forming the antenna element 4. It is attached by soldering or the like at one end. Further, a hole 13 is provided in the metal plate forming the ground 6 by punching, drilling, or the like. The metal plate forming the antenna element 4 is cut to have a smaller area than the metal plate forming the ground 6, and the metal plate forming the ground 6 has approximately the same size as the opening 2 of the housing 1. It is formed in

The antenna element 4 formed of the metal plate described above is installed in the housing 1 by fixing with screws or the like at the tip of the protrusion 3, as shown in FIG. 3, a gap 5 is formed between the antenna element 4 and the inner surface of the housing 1. Further, the ground 6 formed of a metal plate is attached by fitting into the opening 2 of the housing 1 and fixing with screws, etc., and the ground 6 is opposed to the antenna element 4 in parallel with a gap 7 interposed therebetween. In this manner, when attaching the ground 6, the tip of the current collecting pin 14 is made to protrude from the loop hole 13 without coming into contact with the ground 6.

In this way, the antenna element 4 is attached to the housing 1.
The antenna can be assembled by incorporating and attaching the metal plate forming the ground 6 and the metal plate forming the ground 6, and connecting the internal conductor 15a of the coaxial cable 15 to the current collecting pin 14 by soldering etc. By connecting the outer conductor 15b of the coaxial cable 15 to the ground 6 by soldering or the like, the antenna can be used by connecting to an amplifier or the like via the coaxial cable 15. In the antenna assembled in this manner, the layer of air existing in the gap 7 between the antenna element 4 and the ground 6 serves as a dielectric layer. Furthermore, the air gap 5 between the antenna element 4 and the inner surface of the housing 1 can reduce the influence of the dielectric characteristics of the housing 1 on the antenna element 4. Then, by attaching the metal plate forming the antenna element 4 and the metal plate forming the ground 6 to the housing 1 in a deformed state by bending or drawing, the air gap between the antenna element 4 and the ground 6 is removed. The width H of the antenna element 4 can be changed, and the width H of the antenna element 4 can be changed.
The width h of the air gap 5 between the antenna element 4 and the housing 1 can be changed, and the dielectric constant distribution between the antenna element 4 and the ground 6 can be adjusted in various ways to receive reception in a wide band of frequencies. By adapting the dielectric constant distribution,
This makes it possible to receive signals over a wide range of frequencies.

0010

Effects of the Invention As described above, the present invention provides a protrusion on the inner surface facing the opening of the housing, which is open on one side, and fixes the antenna element formed of a metal plate inside the housing at the tip of the protrusion. A gap is formed between the antenna element and the inner surface of the housing, and a ground made of a metal plate is fitted into the opening of the housing and fixed so that it is placed opposite the antenna element across the gap. The antenna can be constructed by incorporating the antenna element and the ground made of In addition, by fitting the ground made of a metal plate into the opening of the housing, it can also be used as the lid of the housing, reducing the number of parts. By bending the metal plate and adjusting the width of the gap between the antenna element and the ground and the gap between the antenna element and the inner surface of the housing, it is possible to receive a wide range of frequencies. It is something that can be done.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of the present invention.

FIG. 2 shows a conventional example, in which (a) is a cross-sectional view of an antenna block, and (b) is a cross-sectional view of the antenna.

[Explanation of symbols]

1 Housing 2 Opening 3 Protrusion 4 Antenna element 5 Voids 6 Grand 7 Voids

Claims (1)

[Claims] Claim 1: A housing having an opening on one side is provided with a protrusion on the inner surface facing the opening, and an antenna element made of a metal plate is fixed in the housing at the tip of the protrusion, so that the antenna element and the inner surface of the housing are connected. An antenna characterized in that a ground formed of a metal plate is fitted and fixed into an opening of a housing, and is arranged to face an antenna element with a gap between the two.