JP2989450B2 - Antenna for portable radio - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna for a portable wireless device in which a handset unit is integrated with a wireless device body and is operated close to a human mouth and ears. The present invention relates to an antenna capable of maintaining a high antenna gain without a radio wave being absorbed or attenuated by a head.

[0002]

2. Description of the Related Art In recent years, cordless telephones and cellular telephones have become extremely popular. Also, some transceivers have a shape and function like a telephone handset. In these portable radios, as shown in FIG. 5, an antenna element 1 that is operated by approaching a human mouth and ears and protruding from a radio housing 10 is used.
2 is a situation located on the side of the human head.

[0003]

Therefore, the human head acts as a kind of dielectric to absorb radio waves radiated from the antenna element 12 and shield and attenuate radio waves to the antenna element 12. As a result, during operation, there is a problem that the original antenna gain of the antenna element 12 cannot be maintained.

The present invention has been made in order to improve the prior art as described above, and has an antenna element provided at a predetermined distance from a radio device housing so as not to be affected by a human head. An object of the present invention is to provide an antenna for a portable wireless device.

[0005]

In order to achieve the above object, an antenna for a portable wireless device according to the present invention includes an antenna element and a radio wave radiated from the antenna element connected to a base of the antenna element. And a ground conductor portion having a predetermined length, which is not provided, so that the antenna element is separated from the radio device housing by the ground conductor portion by a predetermined length.

[0006] The ground conductor may be provided with a choke groove having a depth of 1/4 wavelength of a radio wave radiated from the antenna element, which is opened at the tip end surface.

Further, the antenna element may be formed so as to protrude and be housed in the ground conductor, and the ground conductor may be formed so as to protrude and be housed in the housing of the wireless device.

Further, a coil-shaped antenna element projecting outward in a housed state is provided at the distal end of the antenna element by conductive connection, and a feed point is provided at the base end of the antenna element in either the projecting or housed state. It can also be configured to be electrically connected.

[0009]

[Operation] Since the ground conductor of a predetermined length is connected to the base of the antenna element, the antenna element protrudes above the head during operation, and the antenna gain inherent in the antenna element can be reduced without being affected by the head. Can be maintained.

If a choke groove having a depth of 1/4 wavelength of a radio wave radiated from the antenna element is provided in the ground conductor, the input impedance of the opening with respect to the choke groove becomes infinite, and The radio wave radiated to the portion does not flow, and unnecessary radiation from the ground conductor portion does not occur.

If the antenna element and the ground conductor are formed so as to protrude and be housed in the housing of the wireless device, the antenna element and the ground conductor are housed when not in use, which is suitable for carrying.

Further, a coiled antenna element is provided at the tip of the antenna element, and if the feeding point is connected to the base end of the antenna element in any of the protruding and retracted states, the coiled antenna element is stored in the retracted state of the antenna. A signal received by the antenna element is transmitted to the wireless device via the antenna element, and standby reception is possible. When the antenna is in a protruding state, the coil-shaped antenna element and the rod-shaped antenna element perform an antenna function.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal sectional view of an embodiment of an antenna for a portable wireless device of the present invention protruding from a wireless device housing. FIG. 2 shows the antenna of FIG. 1 housed in a wireless device housing. FIG. 4 is a longitudinal sectional view of the state, and FIG.
FIG. 5 is a diagram showing a positional relationship of an antenna with respect to a human head when a wireless device using the antenna of FIG.

In FIGS. 1, 2 and 4, a decorative ball 14 is fixed to the tip of an antenna element 12 composed of a rod-shaped conductor having an effective length capable of resonating, such as 1/4 wavelength or 1/2 wavelength of a radiated radio wave. A chotin spring 16 made of a conductive elastic body is provided at the base end, and a stopper metal 18 is fixed to the base end. Then, the antenna element 12 causes the decorative ball 14 to protrude outward, and the conductive pipe 20
And slidably disposed therein. The chotin spring 16 is in sliding contact with the inner wall of the conductive pipe 20 to make an electrical connection between the antenna element 12 and the conductive pipe 20. A crimping portion is formed at the end of the conductive pipe 20 by caulking to prevent the chotin spring 16 from coming off in the direction of the end.

Further, a substantially cylindrical ground conductor 24 made of a conductive metal is fixed on the outer periphery of the conductive pipe 20 in an insulated state coaxially through an insulating resin 22 by integral molding or the like. This ground conductor portion 24 is provided with a cylindrical choke groove 24a having an opening at the tip end surface. The depth of the choke groove 24 a is formed at a quarter wavelength of the radio wave radiated from the antenna element 12. The choke groove 24a may be filled with a dielectric member or may be a space.

The base end of the conductive pipe 20 is connected to the ground conductor 2.
4, the insulating plate 26 and the connecting conductor plate 28 are fitted to the protruding portion, and the conductive pipe 20 and the connecting conductor plate 28 are fixed and electrically connected by soldering.

A mounting bracket 30 made of a conductive metal is fixed to the side wall of the radio device housing 10 by screwing, and the ground conductor 24 is slidably inserted into the mounting bracket 30.
The mounting bracket 3 is provided between the mounting bracket 30 and the ground conductor 24.
A conductive band spring 32 fixed to 0 is interposed, and elastically contacts both the mounting bracket 30 and the ground conductor 24 to achieve electrical connection. As an example, the conductive band spring 32 is provided with a squeezed portion at the front end of the inner diameter of the mounting bracket 30, and after being inserted into the inner diameter, the rear end is crimped and fixed. The insulating plate 26 provided at the base end of the conductive pipe 20 insulates the connecting conductor plate 28 from the ground conductor 24 and the mounting bracket 30, and separates the ground conductor 24 from the mounting bracket 30. It is prevented from coming off in the distal direction.

Further, a conductive grounding tongue 34 that is elastically in contact with the mounting bracket 30 is fixed to the inner wall of the wireless device housing 10 near the mounting bracket 30, and is appropriately grounded via the grounding tongue 34. You. A conductive power supply tongue piece 36 elastically in contact with the side wall of the connection conductor plate 28 with the antenna element 12 and the ground conductor 24 protruding as shown in FIG. The power supply tongue 36 and the electric cable 38 are connected to the radio circuit as appropriate.

In such a configuration, as shown in FIG. 1, in a state where the antenna is protruded, a transmission signal from the radio device circuit is applied to the conductive pipe 20 via the electric wire cable 38 or the like. And is radiated from the antenna element 12. Here, the input impedance from the opening of the choke groove 24a to the choke groove 24a becomes infinite, and the radiated radio wave does not flow into the ground conductor portion 24. Since it is grounded via the grounding tongue piece 34, radio waves are not unnecessarily radiated from the ground conductor 24.

The signal received by the antenna element 12 is provided to the radio circuit via the conductive pipe 20 and the electric cable 38. Here, by making the ground conductor 24 act as the outer conductor of the coaxial cable, the reception signal is not attenuated when passing through the conductive pipe 20.

By the way, if the length L of the ground conductor 24 protruding from the radio device housing 10 is approximately 10 cm (corresponding to approximately 1/4 wavelength of a microwave signal for a portable radio telephone), FIG. As shown in FIG. 4, the antenna element 12 protruding from the tip of the ground conductor 24 protrudes above the human head during operation. Therefore, the antenna element 12 is not affected by the head and can maintain the original antenna gain.

As shown in FIG. 2, if the ground conductor 24 is housed in the radio housing 10 and the antenna element 12 is housed in the ground conductor 24,
The projection amount of the antenna from the antenna is small, which is suitable for carrying.

Next, another embodiment of the present invention will be described with reference to FIG. FIG. 3 is a vertical cross-sectional view showing another embodiment of the antenna for a portable wireless device of the present invention housed in a wireless device housing. 3, the same or equivalent members as those in FIGS. 1 and 2 are denoted by the same reference numerals, and redundant description will be omitted.

The other embodiment shown in FIG. 3 is different from the embodiment shown in FIGS. 1 and 2 in that a coil-shaped antenna element 50 is provided at the tip of the antenna element 12 instead of the decorative ball 14. A conductive second power supply tongue piece 52 which is connected and provided integrally and which elastically contacts the side wall of the connection conductor plate 28 in the housed state of the antenna is fixed to the inner wall of the radio device housing 10 to supply power. The tongue piece 36 is connected to the electric cable 38.

In such a configuration, as shown in FIG. 3, when the antenna is housed, a signal can be received by the coil-shaped antenna element 50 projecting outward from the radio device housing 10, and this signal is received. The second power supply tongue 52 and the electric cable 3 via the antenna element 12
The transmission of the radio circuit is carried out via 8. Therefore, standby reception is possible. In addition, when the antenna is stored, the amount of projection of the coil-shaped antenna element 50 is small, and does not impair characteristics suitable for carrying.

If the antenna element 12 is protruded from the ground conductor 24 and the ground conductor 24 is protruded from the housing 10 of the radio equipment, the coiled antenna element 50 and the antenna element 12 can be connected to the human head during operation. Protruded over the part. Therefore, the antenna action of the coiled antenna element 50 and the antenna element 12 is not affected by the head.

Further, in a state where the influence of the head does not matter, the antenna element 12 is made to protrude from the ground conductor 24, but the ground conductor 24 is
It is not necessary to protrude from zero. Antenna element 12
Is electrically connected to the connecting conductor plate 28 via the conductive pipe 20, and the connecting conductive plate 28 is connected to the radio circuit via the second power supply tongue 52.

In the above embodiment, the length L of the ground conductor 24 protruding from the radio equipment housing 10 is approximately 10c.
m, but is not limited to this, and may be set appropriately within a range in which the antenna element 12 provided at the tip protrudes above the head during operation.

[0029]

As described above, since the antenna for the portable radio device of the present invention is constituted, the following special effects can be obtained.

In the antenna for a portable wireless device according to the first aspect of the present invention, since the antenna element protrudes from the tip of the ground conductor portion having a predetermined length protruding from the radio device housing,
During operation, the antenna element protrudes above the head and is not affected by the head, and the original antenna gain of the antenna element is maintained.

In the antenna for a portable wireless device according to the second aspect, a choke groove having a depth of 1/4 wavelength of the radio wave radiated from the antenna element is provided in the ground conductor portion, so that the radio wave is radiated. The input impedance of the choke groove is infinite at the opening of the choke groove, so that the radio wave radiated to the ground conductor does not flow into the choke groove, and the radio wave is not radiated from the ground conductor. Therefore, the antenna gain does not deteriorate due to unnecessary radiation.

In the antenna for a portable wireless device according to the third aspect, if the antenna element and the grounding conductor are housed in the housing of the wireless device, the amount of protrusion of the antenna from the housing of the wireless device is small, and accordingly It is convenient for carrying.

Further, in the antenna for a portable wireless device according to the fourth aspect, the coiled antenna element is provided at the tip of the antenna element so as to protrude outward in the housed state of the antenna. However, signals can be received, and standby reception is possible.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of an antenna for a portable wireless device according to the present invention in a state where the antenna protrudes from a wireless device housing.

FIG. 2 is a longitudinal sectional view showing a state in which the antenna of FIG. 1 is housed in a wireless device housing.

FIG. 3 is a vertical cross-sectional view showing another embodiment of the antenna for a portable wireless device of the present invention housed in a wireless device housing.

FIG. 4 is a diagram showing a positional relationship of the antenna with respect to a human head when the wireless device using the antenna of FIG. 1 operates.

FIG. 5 is a diagram showing a positional relationship of an antenna with respect to a human head when a wireless device using a conventional antenna operates.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Radio | wireless apparatus housing | casing 12 Antenna element 24 Grounding conductor part 24a Choke groove 30 Mounting bracket 50 Coiled antenna element

Claims (4)

(57) [Claims] An antenna element, a ground conductor having a predetermined length connected to a base of the antenna element and not radiating radio waves radiated from the antenna element;
An antenna for a portable wireless device, wherein the antenna element is separated by a predetermined length from the wireless device housing by the ground conductor portion. 2. The choke according to claim 1, wherein the ground conductor has an opening at a tip end surface, and has a depth of １ ／ wavelength of a radio wave radiated from the antenna element. An antenna for a portable wireless device, comprising a groove. 3. The antenna for a portable wireless device according to claim 1, wherein said antenna element is formed so as to be able to protrude and to be housed in said ground conductor, and a ground conductor is formed to be able to protrude and to be housed in said radio device housing. An antenna for a portable wireless device. 4. The antenna for a portable wireless device according to claim 3, wherein a coil-shaped antenna element projecting outward in a housed state is provided at the tip of said antenna element in a conductive connection, and is provided in any of the projecting and housed states. An antenna for a portable wireless device, wherein a feed point is electrically connected to a base end of the antenna element.