JPH04337904A - 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:An antenna element 3 formed by a metal plate is adhered and fixed to the inner face of a housing 1. A ground 4 formed by a metal plate is fitted, fixed to an opening part 2 of the housing 1 and arranged in counter to the antenna element 3 through a void 5. The antenna can be constituted by integrating the antenna element 3 and the ground 4, which are formed by the metal plates, into the housing 1. A ground 6 formed by the metal plate can be also used as the cover of the housing 1. The width of the void between the antenna element 3 and the ground 4 can be changed by bending the metal plate forming the ground 4 or the like, and the distribution of a dielectric constant between the antenna element 3 and the ground 4 can be adjusted by selecting the kind of resin forming the housing 1.

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 an antenna element 3 was formed using one metal foil 11, and a ground 4 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 inserted and attached by processing, and the current collecting pin 14 is connected to the antenna element 3 by soldering or the like. In the antenna block A made of a printed wiring board in which the antenna element 3 and the ground 4 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 4 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] In the antenna according to the present invention, an antenna element 3 formed of a metal plate is tightly fixed to the inner surface facing the opening 2 of a housing 1 having one side open. This is characterized in that the formed ground 4 is fitted into the opening 2 of the housing 1 and fixed, and is placed facing the antenna element 3 with a gap 5 interposed therebetween.

[0006]

[Operation] Since the antenna element 3 and the ground 4 are each made of a metal plate and 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. Further, since the gland 4 formed of a metal plate is fitted and fixed into the opening 2 of the housing 1, the gland 4 can also serve as a lid for the housing 1, and the number of parts can be reduced. Furthermore, the antenna element 3 is formed by bending the metal plate forming the ground 4.
By adjusting the width of the gap 5 between the antenna element 3 and the ground 4, we selected a housing 1 molded from various resins with different dielectric constants and dielectric loss tangents to tightly fix the antenna element 3. By using the antenna as a antenna, the distribution of the dielectric constant and dielectric loss tangent between the antenna element 3 and the ground 4 can be adjusted in various ways, and reception in 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).
It is formed by providing. On the other hand, antenna element 3
and the ground 4 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 collecting pin 14 is soldered at one end on the lower surface of the metal plate forming the antenna element 3. It is attached by doing the same thing. Further, a loop hole 13 is provided in the metal plate forming the ground 4 by punching, drilling, or the like. The metal plate forming the antenna element 3 is cut into a smaller area than the metal plate forming the ground 4.
The metal plate forming the housing 1 is formed to have approximately the same size as the opening 2 of the housing 1.

The antenna element 3 formed of the metal plate described above is attached in close contact with the inner surface of the housing 1 facing the opening 2, as shown in FIG. It is installed so that it is flush with the inner surface of the. When attaching the antenna element 3, it is possible to install the antenna element 3 by providing a recess on the inner surface of the housing 1 and fitting the antenna element 3 into the recess, or by insert molding the antenna element 3 into the housing 1 when molding the housing 1 with resin. It is also possible to attach them integrally. Further, the ground 4 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 4 is opposed to the antenna element 3 in parallel with a gap 5 interposed therebetween. In this way, when attaching the ground 4, the tip of the current collecting pin 14 protrudes from the hole 13 without contacting the ground 4.

In this way, the antenna element 3 is attached to the housing 1.
The antenna can be assembled by incorporating and attaching the metal plate forming the ground 4 and the metal plate forming the ground 4, 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 4 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 5 between the antenna element 3 and the ground 4 serves as a dielectric layer. By bending or drawing the metal plate forming the ground 4 and attaching it to the housing 1 in a deformed state, the width H of the gap 5 between the antenna element 3 and the ground 4 can be changed. , the dielectric constant (ε) and the dielectric loss tangent (tan δ) between the antenna element 3 and the ground 4.
) distribution can be adjusted in various ways, and by selecting and using a housing 1 molded with various resins with different dielectric constants and dielectric loss tangents to tightly fix the antenna element 3, the antenna can be adjusted in various ways. The distribution of the dielectric constant and dielectric loss tangent between the element 3 and the ground 4 can be adjusted in various ways, and in this way the distribution of the dielectric constant and dielectric loss tangent can be adjusted to allow reception in a wide band of frequencies. By adjusting the frequency in this way, it is possible to receive reception over a wide band of frequencies.

0010

Effects of the Invention As described above, in the present invention, an antenna element formed of a metal plate is tightly fixed to the inner surface facing the opening of a housing having an opening on one side, and a ground formed of a metal plate is attached to the housing. Since the antenna element and the ground are fitted and fixed in the opening of the housing and placed opposite to each other with an air gap between them, the antenna can be constructed by incorporating the antenna element formed of a metal plate and the ground into the housing, and printed wiring can be used. The antenna can be manufactured without requiring the man-hours required when using an antenna block made of a plate, and the ground made of a metal plate can also be used as the lid of the housing by fitting it into the opening of the housing. The number of parts can be reduced by adjusting the width of the gap between the antenna element and the ground by bending the metal plate forming the ground. In addition, by selecting and using a housing molded from various resins to tightly fix the antenna element, the distribution of permittivity and dielectric loss tangent between the antenna element and ground can be adjusted in various ways. This allows reception over a wide band of frequencies.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one 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 Antenna element 4 Grand 5 Voids

Claims (1)

[Claims] Claim 1: An antenna element formed of a metal plate is tightly fixed to the inner surface facing the opening of the housing, which is open on one side, and a ground formed of the metal plate is fitted and fixed in the opening of the housing. An antenna characterized by being arranged opposite to an antenna element with an air gap in between.