JPH02154503A - Case for circular antenna - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a case for a circular antenna adapted to a mounting surface having curvature.

[Prior art]

Conventional circular antennas are described, for example, in ``Axisymmetric Mode Annular Batch Antenna and Its Power Feeding Method'' by Kaneda, Fukori et al., Technical Research Report AP87-53, pp. 21-24 There is something.

FIG. 5 is a plan view and a side view of the circular antenna described in item 1.

In FIG. 5, a metal disc 11 and a base plate 12 are connected in parallel via a plurality of short pins 13. Electric signals are supplied from the coaxial cable 15 through a power supply pin 14 provided at the center of the disc 11, and radio waves are radiated from the gap between the disc 11 and the ground plate 12.

When installing a circular antenna such as the one described in item 1 on a vehicle, etc., it is best to store it in a case made of resin or the like to prevent dust and damage.

FIG. 6 is a diagram showing a case where two of the above circular antennas are used as a diversity antenna.

In FIG. 6, 1 and 2 are circular antennas, 3 is a resin case body, and the circular antennas 1 and 2 are housed in the case body 3. In addition, 4 is the base for mounting the case body 3 on a surface of an automobile, etc.
For example, it is a flat plate made of an elastic material such as rubber.

For example, in the case of a device used in the 800MHz band such as a car phone, the external dimensions of the circular antenna case as described above are Q, ≠ 20 cm, Q2 side 40 am, h side 2
■It will be about.

[Invention or problem to be solved]

To attach the above-mentioned circular antenna case to a car, etc., attach adhesive to the bottom surface of the base 4.
When attaching it to a vehicle body, etc., it may be possible to fix it by adhering it to a surface.

However, if the mounting surface has a curvature, such as the surface of a car's body, the curvature may make it difficult to attach firmly. , there is a problem.

In other words, the mounting surface of the car body is the roof or trunk lid, etc., but these usually have a radius of curvature R = 5.
Since the antenna case has a curvature of about 0.00 cm, in the case of an antenna case with the above dimensions, both ends of the antenna case will be bent by 0.4 on, as shown in Figure 7, and the whole will be I just can't get close to it.

In order to solve the above problem, it is conceivable to use the base 4 which is attached to the bottom surface in advance and has the same curvature as the curvature of the surface. However, the curvature of the car body surface varies depending on the car model.
In addition, since the mounting positions of the antennas vary, it is difficult to manufacture the base with various mounting curvatures that suit all of them from the viewpoint of cost.

Also, for installation, it is possible to use a plastic or elastic material for the base 4 and to deform the bottom surface of the base according to the shape of the surface so that it fits tightly, but it is possible to attach the base 4 with a deformation of about 0.4 an. In order to easily obtain the antenna, it is necessary to increase the thickness of the base to about 1 to 2 G, and the thin characteristics and advantages of the circular antenna are lost.

In addition, in order to prevent the contact surfaces at both ends of the base from peeling off over a long period of time, it is necessary to minimize the stress caused by deformation. There is also the problem that it is not possible to ensure the strength of the impact and mounting.

The present invention has been made to solve the following problems, and aims to provide a case for a circular antenna that can be mounted stably and firmly regardless of the curvature of the surface. .

[Means to solve the problem]

In order to achieve the above object, the invention as set forth in claim 1 provides an antenna case for accommodating a plurality of circular antennas arranged in a plane, in which a plurality of circular antenna accommodating portions are provided in the case body! 1 to make the case body flexible in that part, and the entire surface or a part of the surface is made of an adhesive elastic material.For installation, the base should be provided on the bottom of the case body. It is composed of

In addition, in the invention as set forth in claim 2, in an antenna case for storing a plurality of circular antennas in a planar manner, the entire surface or a part of the surface is made of an adhesive elastic body. The base portion is provided on the bottom surface of the case body, and the base portion is configured to have an annular shape along the outer shape of the case body or a patch-like shape divided into a plurality of pieces.

That is, in the invention described in the first claim, by providing a notch in a part of the case body to give flexibility to the case body made of a hard material, mounting with various curvatures is possible. This allows for close contact with the

In addition, in the invention set forth in the second claim, the shape of the base is annular along the outer shape of the case body, or the shape of a punch divided into a plurality of parts is used for mounting. By closely contacting the surface, attachments with various curvatures can be brought into close contact with the surface.

〔Example〕

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

In FIG. 1, 1 and 2 are circular antennas. Further, the case body 6 that houses the circular antennas 1 and 2 is made of, for example, a resin plate, and a notch 7 is provided in the center, that is, between the circular antennas 1 and 2.

In addition, the base 4 is formed of a flat plate made of an elastic material such as rubber, and can be bent at the notch 7 as a boundary.

FIG. 2 is a diagram showing a state in which the antenna case described above is attached to a surface with a curvature. As shown in the figure, when the external dimensions of the antenna case are set in the same way as in the conventional example, the vertical length from the surface of the mounting at both ends of the antenna case is 0. ]an(0,+:500 [1-cos(sj
,n-'-):l), which is 0.4c in the conventional example.
It can be made significantly smaller than i. Therefore, the base 4 can be firmly fixed in close contact with a curved surface without increasing the thickness of the base 4.

Next, FIG. 3 is a perspective view of another embodiment of the present invention.

In this embodiment, a large number of holes 8 are provided in the upper surface of the case body 6 other than the antenna accommodating portion in the embodiment shown in FIG. It is configured as follows. The shape of the holes 8 may be circular, square, or mesh-like.

As mentioned above, in a circular antenna, radio waves are radiated from the gap between the disk 11 and the ground plane 12, so even if water droplets from rain or the like adhere to the top of the disk 11, the characteristics are unlikely to deteriorate. However, if there are water droplets outside the edge of the disk 1, radio waves will be reflected and the antenna characteristics will deteriorate.

Therefore, in this embodiment, a large number of holes 8 are provided on the top surface of the case in a portion other than the top of the circular antenna, and a slit 9 is provided on the side surface of the case that communicates with the holes 8 to drain water droplets from the above portion. The structure is designed to prevent deterioration of characteristics due to adhesion. The structure of other parts is the same as that of the embodiment shown in FIG.

In the embodiment shown in FIG. 3, the hole 8 is provided only on the top surface of the case, but in order to prevent rainwater from accumulating in the notch 7, there are many holes on the slope of the notch 7. A small hole may be provided and the water in that portion may be drained through the slit 9.

In addition, although the case where the cross-sectional shape of the cut portion 7 is V-shaped is illustrated, this cross-sectional shape may be changed to other shapes, such as a U-shape or a
You can also make it into a `` character shape. In that case, it is preferable that the bottom of the notch be sloped from the center toward the outside so that the water in the notch can be quickly drained.

Alternatively, the notches 7 may be filled with an elastic material such as rubber to prevent rainwater from entering at all.

Next, FIG. 4 is a diagram showing still another embodiment of the present invention,
(a) is a perspective view of the case body 3, (b) is a perspective view of the base 20 with annular attachment, and (C) is a perspective view of the base 21 with attachment on the divided patch.

In this embodiment, a normal flat case is used as the case body 3, and the shape of the base is changed for attachment.

First, in the attachment shown in (b), the base 20 is formed of an annular elastic body that follows the outer shape of the case body 3, and has adhesive properties on its upper and lower surfaces.

In such an installation, since the center part of the base 20 is missing, by gluing and fixing this to both the bottom surface of the case body 3 and the mounting surface of the vehicle body, the stress at both ends of the case body during installation can be reduced. can be made smaller and can be installed more firmly.

In addition, in the attachment shown in (c), the base portion 21 is formed of a divided patch-like elastic body, and has adhesiveness on the bottom surface.

In this case, as in the case of (b) above, since there is a cut-out part in the center, the stress at both ends of the case body during installation can be reduced, and firm installation is possible.

In addition, in (b) and (c), the thickness of the elastic body forming the base is changed depending on the location, for example, the thickness of the end part is thicker than the thickness of the center part h2. By doing so, even better results can be obtained.

〔Effect of the invention〕

As explained above, according to the present invention, the attachment provided at the bottom of the flat case body can be made by using an elastic base and providing flexibility in the case body by providing a notch in the center of the case, or By making the elastic body into a ring or patch shape and fixing it to the car body by the adhesiveness of the surface, it can be firmly fixed to the car body regardless of the presence or absence of curvature of the car body surface, and it can be achieved at low cost. You can get the effect that you can.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of one embodiment of the present invention, FIG. 2 is a diagram showing the amount of isolation in the mounting state, FIG. 3 is a perspective view of another embodiment of the present invention, and FIG. 4 is a perspective view of the present invention. 5 is a plan view and a side view of an example of a circular antenna, FIG. 6 is a perspective view of a conventional antenna case, and FIG. 7 is an isolated state in a detached (-1) state. It is a diagram showing the amount. <Explanation of symbols> 1.2...Circular antenna 3.6...Case body 4...Mounted at base 5...Mounted to vehicle body at surface 7...Notch 8/hole 9...Slit 20/Annular attachment is at the base 21 Patch-shaped attachment is at the base Patent attorney Junnosuke Nakamura

Claims (1)

[Claims] 1. In an antenna case in which a plurality of circular antennas are housed side by side in a planar manner, a cut portion is provided between the plurality of circular antenna storage portions in the case body so that the case body is flexible at that portion. 1. A case for a circular antenna, characterized in that a mounting base is provided on the bottom of the case body, and the entire surface or a part of the surface is made of an adhesive elastic material. 2. In an antenna case in which a plurality of circular antennas are housed side by side in a plane, a mounting base made of an elastic material whose entire surface or part of the surface is adhesive is provided on the bottom of the case body, and the mounting base is A case for a circular antenna, characterized in that the case has an annular shape or a patch-like shape divided into a plurality of pieces along the outer shape of the case body.