JPH08148917A - Radio communication equipment - Google Patents

Abstract

PURPOSE: To make a housing space of an antenna small by bending a part of an antenna element in a recessed shape and defining the inductance element of a trap circuit. CONSTITUTION: The antenna 5 is composed of an antenna line 6 for which nickel plating is performed to a brass wire and a capacitor 7. The antenna line 6 is provided with a recessed part 8 formed by bending a part of it in the recessed shape in the height direction of a cabinet 1 and the capacitor 7 is soldered to the antenna line 6 over the open end of the recessed part 8. The antenna 5 is also held by a rib 9 provided in the inner side part of the container 3 of the cabinet 1 and disposed along the inner side part of the container 3, then one end is screwed to a printed board 4 and thus, it is electrically connected to the printed board 4. In the constitution, the recessed part 8 of the antenna line 6 performs the role of the inductance element in a high frequency band and forms the trap circuit along with the capacitor 7. Thus, two frequencies can be coped with by one antenna 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device having a built-in antenna.

[0002]

2. Description of the Related Art In recent years, in a wireless communication device such as a cordless telephone device, an antenna is used to improve the appearance and prevent damage to the antenna as disclosed in, for example, Japanese Unexamined Patent Publication No. 3-206737. Is stored in the cabinet.

By the way, in a full-duplex type communication device such as a cordless telephone device, since the reception frequency and the transmission frequency are different, it is necessary to provide an antenna corresponding to each of them.
As a result, it was necessary to arrange two antennas in the cabinet.

[0004]

The above two antennas are specifically a combination of rod antennas having different lengths or a combination of a rod antenna and a loop antenna.

In any combination, a large storage space is required, which leads to an increase in the size of the device, and it is necessary to fix each antenna, which increases the number of working steps. became.

[0006]

A wireless communication device of the present invention comprises a cabinet and an antenna element housed in the cabinet, wherein a part of the antenna element is bent in a concave shape to form an inductance of a trap circuit. It is an element.

[0007]

With the trap circuit formed by the concave portion of the antenna element, one antenna can handle two frequency bands.

[0008]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a side cross-sectional view of a base unit of a cordless telephone device, in which (1) is a resin cabinet consisting of a lid (2) and a container (3). (3) is fixed by a screw (not shown). Reference numeral (4) is a printed circuit board fixed in the container (3) of the cabinet (1), and reference numeral (5) is an antenna, which comprises an antenna wire (6) obtained by nickel-plating a brass wire and a capacitor (7). Part of the antenna wire (6) is the cabinet (1).
Has a concave portion (8) formed by bending it in a concave shape in the height direction, and the capacitor (7) is soldered to the antenna wire (6) across the open end of the concave portion (8). Also, the antenna (5) is held by ribs (9) (9) provided on the inner side of the container (3) of the cabinet (1) and arranged along the inner side of the container (3), Then, one end is screwed to the printed circuit board (4) and thereby electrically connected to the printed circuit board (4). This antenna (5)
The arrangement state of is more apparent from the plan view of the container (3) in FIG. As shown in FIGS. 1 and 2, a predetermined space is provided between the recess (8) and the printed board (4).

Thus, in the high frequency band, the concave portion (8) of the antenna wire (6) functions as an inductance element and forms a trap circuit together with the capacitor (7). In the present invention, the antenna wire (6) is shown in FIG.
And the shape shown in, by the capacitor (7) and 5PF and has made it possible to tune to two frequency bands 254MH _Z and 380MH _Z.

In the present invention, since the open end of the recess (8) and the open end of the container (3) are aligned with each other,
There is also an advantage that the capacitor (7) can be easily attached and detached by simply removing the lid body (2).

Since the antenna (5) is erected on the container (3) and the recess (8) is formed by utilizing the height of the container (3), the printed circuit board (4) and the antenna (5) are formed. It is not necessary to consider the insulation (for example, when it is arranged on the bottom surface of the container (3), it is necessary to consider the insulation between the entire antenna (5) and the printed board (4)).

[0013]

As described above, according to the present invention, since the trap circuit formed by the recess of the antenna element can handle two frequency bands with one antenna, the storage space for the antenna of the cabinet can be reduced. Moreover, the number of steps for fixing the antenna can be reduced.

[Brief description of drawings]

FIG. 1 is a side sectional view of a wireless communication device of the present invention.

FIG. 2 is a plan view of a container of the wireless communication device of the present invention.

FIG. 3 is a perspective view of an antenna of the present invention.

[Explanation of symbols]

 1 Cabinet 5 Antenna 6 Antenna wire 8 Recess

Claims (1)

[Claims] 1. A wireless communication device comprising a cabinet and an antenna element housed in the cabinet, wherein a part of the antenna element is bent in a concave shape to form an inductance element of a trap circuit.