JPH05167323A - Antenna system - Google Patents

Abstract

PURPOSE:To miniaturize an antenna system by eliminating the need for large- sized parts and also to reduce its cost. CONSTITUTION:When a 1/4lambda whip antenna 12 is attached, the end part of a fitting part 12a comes into contact with an exclusive connecting terminal 16a provided with the elasticity of a power feeding part 16 and is connected to a radio part 11 through an exclusive matching circuit 17 for matching the terminal impedance. When a loading whip antenna 13 is attached, the end part of a fitting part 13b comes into contact with an exclusive connecting terminal 16b provided with the elasticity of the feeding part 16 and is connected to the radio part 11 through an exclusive matching circuit 18 for matching the terminal impedance. In such a manner, two contact plugs or a coaxial switch for selecting two contact plugs is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device used for portable radio telephones and the like.

[0002]

2. Description of the Related Art FIG. 3 shows the configuration of a conventional antenna device. In FIG. 3, reference numeral 30 denotes an exterior body of the portable wireless device, and 31 denotes a wireless unit that performs a transmission / reception process. 32
Indicates a 1 / 4λ whip antenna, 33 indicates a loading whip antenna which is a shortened antenna, and 34 indicates 1 / 4λ
Plug for connecting the whip antenna 32, 35 for connecting the loading whip antenna 33, 36 for a matching circuit dedicated to matching the impedance of the 1 / 4λ whip antenna 32, and 37 for a low Denoted by 38 is a matching circuit dedicated to matching the impedance of the Ding whip antenna 33, and 38 is a matching circuit 36.
The coaxial switching device for switching between and the matching circuit 37 is shown.

Next, the function of this configuration will be described.
The matching circuit 36 or the matching circuit 37 is switched by the coaxial switching device 38, and the 1 / 4λ whip antenna 32 or the loading whip antenna 35 is selected and connected to the radio unit 31.

[0004]

However, in the antenna device of the conventional example, the two plugs 34 and 35 are arranged and the coaxial switching device 38 is further provided, so that the portable radio device can be miniaturized. However, there is a drawback that the cost is further increased.

The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an excellent antenna apparatus which can be reduced in size without requiring large parts and can be reduced in cost.

[0006]

In order to achieve this object, the antenna apparatus of the present invention has a mounting portion for inserting and mounting an end portion of a load selected from a plurality of loads, and a load portion of the selected load. At the same time as inserting and mounting the end part into the mounting part, there are multiple power supply parts that are equipped with multiple contacts for exclusive use of individual loads that only make mechanical contact with the end part of the selected load, and there are multiple contacts to match the terminating impedance of each load. And a plurality of load-dedicated matching circuits connected between each of the individual load-dedicated contacts and the signal processing unit.

[0007]

Therefore, according to the antenna apparatus of the present invention, the end portion of the selected load is inserted into the mounting portion to be mounted, and at the same time, only the end portion of the selected load is mechanically contacted with the individual load dedicated contact. Since the load-only matching circuit for matching the terminating impedance of each load is provided between the signal processing unit and the signal processing unit, a large component, for example, a plug, a coaxial switching device is not required, and the size is reduced, and The cost can be reduced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the antenna apparatus of the present invention will be described below with reference to the drawings.

1 (a) and 1 (b) show a schematic structure of a state in which a whip antenna in the embodiment is mounted. In FIGS. 1A and 1B, 10 indicates an exterior body of a portable wireless device, and 11 indicates a wireless unit that performs transmission / reception signal processing. 12 is a 1 / 4λ whip antenna, 13 is a loading whip antenna of a shortened antenna, and 15 is 1 /
A connection part for attaching the 4λ whip antenna 12 or the loading whip antenna 13 is 1
A power feeding unit for feeding power to the / 4λ whip antenna 12 and the loading whip antenna 13 is shown. The feeding portion 16 is provided with a connection terminal 16a for contacting the 1 / 4λ whip antenna 12 and a connection terminal 16b for contacting the loading whip antenna 13. 17 is a dedicated matching circuit for matching the termination impedance with the 1 / 4λ whip antenna 12, 18
Shows a dedicated matching circuit for matching the terminating impedance of the loading whip antenna 13.

Further, this schematic structure will be described in detail.
2A and 2B show detailed configurations corresponding to the schematic configurations shown in FIGS. 1A and 1B, respectively. Figure 2
In (a), the connecting portion 15 is arranged in the insulating outer casing 10. The tubular portion 15a is inserted into the connecting portion 15 from the outside to the inside of the exterior body 10, and the tubular portion 15a is fixed by screwing it with a nut 15b. A female screw is provided in the through hole of the tubular portion 15a.

In the female screw of the through hole of the tubular portion 15a,
Mounting portion 12 at the bottom of the 1 / 4λ whip antenna 12
The male screw of a is screwed and fixed. At this time, at the same time, the end portion of the mounting portion 12a contacts the elastic connection terminal 16a of the power feeding portion 16. In this state, the connection terminal 16a,
Through the matching circuit 17, the 1 / 4λ whip antenna 12
Will be connected to the wireless unit 11. In this case, the connection terminal 16b and the end of the mounting portion 12a of the 1 / 4λ whip antenna 12 do not come into contact with each other.

When removing the 1/4 λ whip antenna 12 mounted in this way, the mounting portion 12
A is rotated in the direction opposite to that at the time of attachment so as to be separated from the tubular portion 15a.

In FIG. 2 (b), the male screw portion of the mounting portion 13a of the loading whip antenna 13 is screwed and fixed to the female screw of the through hole of the tubular portion 15a. In this case, the lower part of the mounting portion 13a is the mounting portion 13a.
It is thinner, and the end of the thin mounting portion 13b comes into contact with the elastic connection terminal 16b of the power feeding portion 16. In this state, the loading whip antenna 13 is connected to the wireless unit 11 through the connection terminal 16b and the matching circuit 18. In this case, the connection terminal 16a and the end of the mounting portion 13b of the loading whip antenna 13 do not come into contact with each other. When the loading whip antenna 13 attached in this manner is removed, the attachment portion 13a is rotated in the opposite direction to the attachment and detached from the tubular portion 15a.

Next, the function of this configuration will be described.
When the 1/4 λ whip antenna 12 is attached, the end of the attachment portion 12a contacts the connection terminal 16a of the power feeding portion 16 and is connected to the wireless portion 11 through a dedicated matching circuit 17 for matching the termination impedance.

The loading whip antenna 13
When attached, the end of the attachment portion 13b becomes the power feeding portion 16
The connection terminal 16b is connected to the wireless unit 11 through a dedicated matching circuit 18 for matching the terminating impedance.

In this way, the selected 1 / 4λ whip antenna 12 or loading whip antenna 13 is selected.
When any of the above is attached, the dedicated connection terminals 16a and 16b are brought into contact with each other, and the dedicated matching circuit 17 and matching circuit 18 are selected. For this reason, large parts, for example, the two plugs described above and the coaxial switching device for selecting the two plugs are not required, and the size can be reduced and the cost can be reduced.

Here, an example in which the 1/4 λ whip antenna 12 or the loading whip antenna 13 is replaced is shown, but instead of this, another load, for example,
Similar effects can be obtained even if a power meter or the like is connected.

[0018]

As is apparent from the above description, in the antenna apparatus of the present invention, the end portion of the selected load is inserted into the mounting portion to be mounted, and at the same time, only the end portion of the selected load is mechanically attached. Since a load-only matching circuit for matching the terminating impedance of each load is provided between the contact point for exclusive use of the individual load and the signal processing unit,
There is an effect that a large-sized component, for example, a plug and a coaxial switching device is not required, the device is downsized, and the cost can be reduced.

[Brief description of drawings]

1A and 1B are configuration diagrams showing a schematic configuration in an embodiment of an antenna device of the present invention.

2A and 2B are side views showing a detailed configuration corresponding to the schematic configuration of FIGS. 1A and 1B.

FIG. 3 is a configuration diagram showing a schematic configuration of a conventional antenna device.

[Explanation of symbols]

 12 1/4 λ whip antenna 12a mounting portion 13 Loading whip antenna 13a mounting portion 15 Connection portion 15a Tubular portion 16 Feeding portion 16a, 16b Connection terminal 17, 18 Matching circuit

Claims (1)

[Claims] 1. A mounting portion for inserting and mounting an end portion of a selected load from a plurality of loads, and an inserting portion for mounting the end portion of the selected load to the mounting portion, and at the same time,
A power supply unit having a plurality of individual load dedicated contacts that only mechanically contact the ends of the selected loads, and a plurality of individual load dedicated contacts and a signal processing unit for matching the termination impedance of the individual loads. And a plurality of load-only matching circuits connected between the antenna and the antenna.