JPH04259102A - Microstrip antenna - Google Patents

Abstract

PURPOSE:To make the board small and to simplify the assembling. CONSTITUTION:A ground plate 11 having a slope 11b formed in a direction while its diameter is spread is provided to a surrounding of a board mount face 11a, a board 10 with an antenna element 10a formed thereon is fitted to a board mount face 11a of the ground conductor 11 and the antenna element 10a on the board 10 and an RF circuit 12 are connected electrically by using a connector 13 to make the board 10 small and to simplify the assembling.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microstrip antenna used in, for example, a GPS receiver that receives positioning signals from GPS satellites.

0002

2. Description of the Related Art Conventionally, this type of microstrip antenna has an RF (high frequency) circuit section 2 attached to a mounting base 1, as shown in FIG. 4, and an antenna element 3a as a radiation conductor. The formed substrates 3 are placed facing each other. This substrate 3 is made of a dielectric material such as fluororesin, and has a conductive film as a ground conductor on the other side opposite to the one side on which the antenna element 3a is formed (in FIG. 4, for convenience of illustration, this is not shown). ) is formed. The antenna element 3a is electrically connected to the RF circuit section 2 through the connector 5 while the substrate 3 is placed opposite to the RF circuit section 2 via an elastic body 4 such as a sponge. This connector 5
One side is fixed to the substrate 3, and the other side is fixedly supported by the RF circuit section 2, and the two are electrically connected and fixed by, for example, screwing. A cover member 6 that transmits radio waves is mounted on the mounting seat 1.
It is attached so as to cover the F circuit part 2 and the board 3. Note that the elastic body 4 is temporarily bonded between the substrate 3 and the RF circuit section 2 using double-sided tape or the like to temporarily position them.

However, when the microstrip antenna is configured such that the antenna element 3a is formed on one side of the substrate 3 and a conductive film (not shown) is formed on the other side, the conductive film (not shown) forming the ground conductor is (not shown) is approximately 1.5 times the area of the antenna element 3a, and compared to the case where only the antenna element 3a is formed on the expensive substrate 3, the area required for the substrate 3 is approximately 1.5 times that of the antenna element 3a. This has the problem of requiring double the area, making it expensive, and making it difficult to promote miniaturization. Further, according to this, it is difficult to accurately position and install the board 3 without positioning it using the connector 5 for electrical connection while temporarily fixing the board 3 to the RF circuit section 2 using the elastic body 4. Therefore, there was also the problem that the assembly work was extremely troublesome.

0004

As described above, conventional microstrip antennas have the problems of being large in size and requiring very troublesome assembly work.

[0005] The present invention was made in view of the above circumstances, and an object thereof is to provide a microstrip antenna that has a simple structure, can be downsized, and can simplify assembly work. shall be.

[0006]

[Means for Solving the Problems] The present invention provides a dielectric substrate having a radiation conductor formed on one surface and having a system comparable to that of the radiation conductor, and a dielectric substrate mounted on the other surface of the dielectric substrate. The microstrip antenna includes a ground motion body having a mounting surface that extends in diameter, and a ground motion body having an inclined surface formed around the mounting surface in a direction in which the diameter increases.

[0007]

According to the above structure, the ground conductor has an inclined surface formed in a direction in which the diameter increases with respect to the periphery of the mounting surface attached to the other surface of the dielectric substrate. Therefore, the dielectric substrate may have a size comparable to that of the antenna element, and can be constructed at low cost and downsized.

[0008]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a microstrip antenna according to an embodiment of the present invention. In the figure, 10 is a substrate made of a dielectric material such as fluororesin, and an antenna element 10a is provided as a radiation conductor on one surface. is formed (Fig. 1(a)
)reference). As shown in FIG.
a is attached using screws or the like. This ground conductor plate 11 is formed by pressing a metal material such as aluminum, and has a board mounting surface 11a having approximately the same shape as the board 10, and a board mounting surface 11a around the board mounting surface 11a. Inclined surface 1 formed in the direction in which the diameter increases relative to
1b and is formed into a substantially truncated conical shape (see FIG. 2).

[0010] On the inside of the ground conductor plate 11 is a preamplifier etc.
An F circuit section 12 is arranged, and this RF circuit section 12 and the substrate 1
The antenna element 10a on the antenna element 10 is electrically connected to the antenna element 10a on the antenna element 10 through, for example, a one-push type connector 13. and,
The ground conductor plate 11 is fixed to a mounting seat 15 provided on a mounting bracket 14 using screws or the like, and a cover member 16 is attached to the mounting seat 15 so as to cover the substrate 10 on the ground conductor 11. Further, the mounting seat 15 is provided with an output connector 17 that is connected to an internal device such as a receiver (not shown), and the RF circuit section 12 is electrically connected to the output connector 17 via a cable 18.

As described above, in the above microstrip antenna, the ground conductor plate 11 has a cylindrical inclined surface 11 formed in a direction in which the diameter increases with respect to the periphery of the board mounting surface 11a.
b is provided, and the substrate 10 on which the antenna element 10a is formed is attached to the substrate mounting surface 11a of the ground conductor plate 11, and the antenna element 10a on the substrate 10 and the RF circuit part 12 are connected via the ground conductor plate 11. The configuration was such that electrical connection was made using a connector 13. According to this, the substrate 10
By supporting the RF circuit section 12 and the RF circuit section 12 on the ground conductor plate 11, mutual positioning can be performed reliably, and installation and assembly work including electrical connection work can be simplified. According to this, the substrate 10 includes the antenna element 1
It only needs to be large enough to form the ground conductor 0a, and the shape and dimensions can be made much smaller than in the conventional case where the ground conductor is formed using a conductive film. Due to the smaller size, the price can be lowered, which is economically advantageous.

Further, according to this, since the ground conductor plate 11 is provided with the inclined surface 11b, the sensitivity characteristic at an angle below the horizontal (H) direction, for example in the antenna characteristics shown in FIG. What used to be shown by is now shown by the solid line in the figure, and the sensitivity is improved. It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that various modifications can be made without departing from the gist of the invention.

[0013]

[Effects of the Invention] As detailed above, according to the present invention, it is possible to provide a microstrip antenna that has a simple structure, can be made smaller, and can simplify assembly work. can.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a microstrip antenna according to an embodiment of the present invention.

FIG. 2 is a diagram showing the ground conductor and substrate of FIG. 1 taken out;

FIG. 3 is a characteristic diagram shown to explain the operation of FIG. 1;

FIG. 4 is a diagram showing a conventional microstrip antenna.

[Explanation of symbols]

10... Substrate, 10a... Antenna element, 11... Ground conductor plate,
11a... Board mounting surface, 11b... Inclined surface, 12... RF circuit section, 13... Connector, 14... Mounting bracket, 15... Mounting seat,
16...Cover member, 17...Output connector.

Claims (1)

[Claims] Claim 1: A radiation conductor is formed on one surface, a dielectric substrate having a system comparable to that of the radiation conductor, and a mounting surface to be attached to the other surface of the dielectric substrate, and and a ground moving body having an inclined surface formed in a direction in which the diameter widens around the mounting surface.