JP2573436B2 - Antenna device - Google Patents

Antenna device

Info

Publication number
JP2573436B2
JP2573436B2 JP3152792A JP15279291A JP2573436B2 JP 2573436 B2 JP2573436 B2 JP 2573436B2 JP 3152792 A JP3152792 A JP 3152792A JP 15279291 A JP15279291 A JP 15279291A JP 2573436 B2 JP2573436 B2 JP 2573436B2
Authority
JP
Japan
Prior art keywords
antenna
cover
plate
dielectric plate
dielectric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP3152792A
Other languages
Japanese (ja)
Other versions
JPH053409A (en
Inventor
昌行 松尾
一弘 松本
万典 松本
Original Assignee
松下電工株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 松下電工株式会社 filed Critical 松下電工株式会社
Priority to JP3152792A priority Critical patent/JP2573436B2/en
Publication of JPH053409A publication Critical patent/JPH053409A/en
Application granted granted Critical
Publication of JP2573436B2 publication Critical patent/JP2573436B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device installed inside a moving body such as a vehicle interior.

[0002]

2. Description of the Related Art In mobile communication, a top-loading antenna that is omnidirectional and low-profile in a horizontal plane has attracted attention. FIG. 5 shows a conventional antenna of this type, in which a loading plate 1,
An antenna A includes a ground plate 2 and a power supply unit 3, and an antenna cover 4 that covers the antenna A.

[0003]

Such a top loading antenna is sometimes installed in a vehicle compartment or a vehicle body in order to make the antenna invisible from the outside. When the antenna is installed inside the resin or seat in the vehicle, the resonance frequency of the antenna shifts to a lower one due to the influence of the dielectric.

For this reason, the resonance frequency of the antenna is adjusted to a slightly higher value at the time of shipment. However, since the installation condition is not constant due to the difference in the type of vehicle and the location, the distance between the dielectric and the antenna or the dielectric is different. The amount of frequency shift varies greatly depending on the type of body. For this reason, there has been a problem that optimal frequency adjustment cannot be performed. The present invention has been made in view of the above points, and has as its object to correct a displacement of a resonance frequency due to an influence from a surrounding environment in which an antenna is installed and to eliminate a problem in practical use as much as possible. It is intended to provide an antenna device having the following configuration.

[0005]

The present invention comprises an antenna,
A cover for covering the antenna, the antenna and the cover;
Between the dielectric plate, the dielectric plate and the
And a variable mechanism that changes the relative positional relationship with the antenna.
It is a thing.

[0006]

The change in the resonance frequency of the antenna caused by the surrounding environment in which the antenna device is installed is corrected by varying the relative positional relationship between the antenna and the dielectric plate using a variable mechanism. Thus, problems in actual use can be eliminated as much as possible.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross-sectional view of the whole, and FIG. 2 shows a perspective view of a main part. Three support columns 6 are provided from the ground plate 2 via the loading plate 1. In addition, a dielectric plate 5 made of a resin plate such as acrylic is disposed on the front surface of the top loading antenna A, and the dielectric plate 5 is fitted into the screw portion 7 on the inner surface of the antenna cover 4.

The dielectric plate 5 is provided with a hole 8 through which the support column 6 is inserted, and a mechanism in which the dielectric plate 5 inserted into the support column 6 is fitted into the screw portion 7 of the antenna cover 4. It has become. When the antenna resonance frequency is displaced due to the antenna installation situation or the surrounding environment, etc., the inner dielectric plate 5 cannot be rotated in the same direction by the support pillar 6 by rotating the antenna cover 4. Movable.
Thus, the shift amount is corrected by changing the distance between the antenna A and the dielectric plate 5.

Therefore, it is possible to correct a change in the resonance frequency of the antenna A due to the surrounding environment in which the antenna device is installed, and to minimize problems in practical use as much as possible. The variable mechanism is constituted by the screw portion 7, the support column 6, and the like. Second Embodiment FIG. 3 shows a second embodiment, in which a top loading antenna A is used.
A dielectric plate 5 made of a semicircular resin plate made of acrylic or the like is fixed to the antenna cover 4 by support columns 6 on the front surface of the antenna cover 4.

When the antenna cover 4 is rotated, the dielectric plate 5 covers the loading plate 1 on the front surface of the antenna A, and the shift amount of the antenna resonance frequency is reduced. to correct. Third Embodiment FIG. 4 shows a third embodiment, in which a dielectric plate 5 is connected to an antenna cover 4.
And the step 9 of the antenna cover 4 and the ground plate 2
Between the antenna cover 4 and the antenna vertical adjustment plate 11 provided on the opening surface of the antenna cover 4.
2, the distance between the antenna A and the dielectric plate 5 is adjusted based on the amount of protrusion caused by the rotation of the adjustment screw 12.

By turning the adjusting screw 12, the ground plate 2 abutting on the tip of the adjusting screw 12 moves up and down, thereby changing the relative distance from the dielectric plate 5.
The shift amount of the antenna resonance frequency can be corrected. Further, the dielectric plate 5 may be used also as the antenna cover 4.

[0012]

As described above, the present invention relates to an antenna,
A cover for covering the antenna, the antenna and the cover,
And a dielectric plate disposed between the dielectric plate and the electrode.
It has a variable mechanism that changes the relative positional relationship with the antenna, so that the change in the resonance frequency of the antenna due to the surrounding environment where the antenna device is installed By varying the target positional relationship by the variable mechanism, the resonance frequency can be corrected, and an effect of minimizing problems in actual use can be achieved.

[Brief description of the drawings]

FIG. 1 is a sectional view of an antenna device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a main part.

FIG. 3 is a sectional view of a second embodiment.

FIG. 4 is a sectional view of a third embodiment.

FIG. 5 is a sectional view of a conventional antenna device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Loading plate 2 Grounding plate 3 Feeding part 4 Antenna cover 5 Dielectric plate 6 Support pillar 7 Screw part A Antenna

Claims (1)

    (57) [Claims]
  1. An antenna and a cover for covering the antenna
    And a dielectric disposed between the antenna and the cover.
    Body plate, relative positional relationship between the dielectric plate and the antenna
    An antenna device comprising: a variable mechanism configured to change a value.
JP3152792A 1991-06-25 1991-06-25 Antenna device Expired - Fee Related JP2573436B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP3152792A JP2573436B2 (en) 1991-06-25 1991-06-25 Antenna device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP3152792A JP2573436B2 (en) 1991-06-25 1991-06-25 Antenna device

Publications (2)

Publication Number Publication Date
JPH053409A JPH053409A (en) 1993-01-08
JP2573436B2 true JP2573436B2 (en) 1997-01-22

Family

ID=15548251

Family Applications (1)

Application Number Title Priority Date Filing Date
JP3152792A Expired - Fee Related JP2573436B2 (en) 1991-06-25 1991-06-25 Antenna device

Country Status (1)

Country Link
JP (1) JP2573436B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004073108A1 (en) * 2003-02-14 2004-08-26 Kabushiki Kaisha Toshiba Electronic device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5496556U (en) * 1977-12-20 1979-07-07

Also Published As

Publication number Publication date
JPH053409A (en) 1993-01-08

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Legal Events

Date Code Title Description
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 19960910

LAPS Cancellation because of no payment of annual fees