JP3448729B2 - Separate antenna - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention mainly relates to a mobile phone,
The present invention relates to a dual-band compatible antenna used in a mobile communication terminal device such as a PHS, which has an electrically separated structure so that antenna elements at the time of extension and at the time of storage can reduce interference with each other.

[0002]

2. Description of the Related Art FIG. 5 shows a conventional separation type antenna. FIG. 5A shows the whole and FIG. 5B shows the separation structure.

As shown in FIG. 5, a conventional separation type antenna has a top portion 3 containing an antenna element (element) which functions as an antenna when housed and an element 1 which functions as an antenna when extended and which is made of a metal conductive sleeve. 41 and an insulator 51 made of a non-conductive resin composition that is mechanically connected to the sleeve 41 so as to be electrically separated. In a conventional antenna, a mechanically connected insulator 51 is connected with a length substantially equal to that of a conductive sleeve 41 which plays a role of a feeding point of an element 2 which serves as an antenna when housed, and when expanded and housed. At this time, the elements 1 and 2 are electrically separated from each other.

This separation structure has the following advantages. The element 2 in the top portion 3 that serves as an antenna when the antenna is housed does not work as an antenna because it does not have a feeding point due to its separate structure. Therefore, it does not affect the element 1 which becomes the antenna when extended. On the contrary, when the element 1 is housed, the element 1 which is an antenna when extended does not have a feeding point and does not function as an antenna. Therefore, it does not affect the element 2 that serves as an antenna when stored. in this way,
When there is no influence of the antennas of each other, the design such as impedance matching with the inside can be simplified.

On the other hand, however, the insulator 51 made of a resin composition such as nylon that mechanically connects the element 1 that serves as the antenna when extended and the element 2 that serves as the antenna when housed is easily bent and bent. There is a problem that occurs.

[0006]

In the prior art, the resin portion such as nylon that mechanically connects the respective antenna elements during storage and extension bends when bent,
There is a drawback that problems such as bending easily occur.

Therefore, an object of the present invention is to provide a separation type antenna which is unlikely to be bent or bent when bent.

[0008]

SUMMARY OF THE INVENTION The present invention provides an insulator that electrically couples a plurality of elements, a conductive sleeve that serves as a feeding point of an antenna, and the elements to each other mechanically and electrically insulates each other. An antenna having, one element is fixed to one end of the insulator, the other element is fixed to a metal fitting, the insulator has a neck portion at a central portion and a collar portion at the other end, and the sleeve Is fitted into the insulator within the neck of the insulator, the sleeve and the insulator are provided with fasteners, and the metal fitting is engaged with the insulator so as to hold the flange portion of the insulator, and is moved. And has a structure capable of contacting either the sleeve or the insulator, and A separation type antenna, characterized in that with a possible holding structure by fasteners to either the sleeve or the insulator.

Further, the present invention is the above-mentioned separation type antenna, wherein the plurality of elements have different resonance frequencies.

Further, the present invention is the above-mentioned separation type antenna, wherein one of the plurality of elements is a dielectric resonator.

Further, the present invention is the above-mentioned separation type antenna, wherein one of the plurality of elements is made of a shape memory alloy.

Also, the present invention is the above-mentioned separation type antenna, wherein the dielectric resonator is a coaxial type dielectric resonator.

Further, the present invention is the above-mentioned separation type antenna, wherein the cross-sectional shape of the metal fitting is a shape in which a U-shaped tip portion is bent so that tops of the tip portions face each other.

Further, the present invention is the above-mentioned separation type antenna, wherein the metal fitting is provided with a boss for fixing the element.

Further, the present invention is the above-mentioned separation type antenna, wherein the fastener is a ball-shaped object.

According to the present invention, the length of the sleeve is
The separate antenna is shorter than the insulator.

Further, the present invention is the above-mentioned separation type antenna, wherein the sleeve is made of any one of an aluminum alloy, a magnesium alloy and a resin composition having a conductive surface treatment.

In the present invention, each element has a structure that separates according to the force required for its operation during extension and storage. In other words, when the top part is pulled in the extension direction with a certain force or more, the element inside the top part that serves as the antenna during storage is electrically separated from the sleeve that is the feeding point and pulled out from the inside of the main body of the communication device. The extended antenna element is electrically connected to a stopper which is a feeding point.

On the contrary, when the top portion (inner element) is pushed into the housing direction with a certain force or more,
The element inside the top that will be the antenna when stored is electrically connected to the sleeve that is the feeding point, and the stopper that is the feeding point of the element that will be the antenna when extended inside the main body of the communication device is electrically separated from the holder. Therefore, only the element in the top part becomes the antenna.

Also, as in the conventional antenna as shown in FIG. 5, a mechanically connected insulator has a length substantially equal to that of a conductive sleeve which plays a role of a feeding point of an element which becomes an antenna when housed. If there is a resin-only part with a length of a few millimeters in the insulator, it will be bent against bending as described above in order to electrically separate the elements that will be connected with However, unlike the conventional antenna structure, in the antenna of the present invention, a conductive sleeve that plays a role of a feeding point of an element that serves as an antenna when housed is more than a insulator formed of a resin portion. The sleeve itself is made relatively short, and the sleeve itself is made of a resin composition that has been subjected to a conductive surface treatment, so that it can be impacted by external force such as falling. Shock absorption is improved when the occurrence of damage, including breakage and the like at the boundary between the conductive sleeve and the insulator to be a problem in the conventional antenna can be reduced.

[0021]

1 and 2 show a structure for electrically separating a plurality of elements of a separation type antenna according to the present invention. FIG. 1 shows a state when the antenna is extended, and FIG. 2 shows a state when the antenna is housed. Further, FIG. 3 shows the whole of the separation type antenna when it is extended.

As shown in FIGS. 1 and 2, the structure of the separation type antenna of the present invention is such that a helical coil type element 2 having a different resonance frequency, an element 1 made of a shape memory alloy, and a conductivity type serving as a feeding point of the antenna are provided. Sleeve 4
And an insulator 5 that mechanically couples the elements 1 and 2 to each other and electrically insulates them. The element 1 is fixed to one end of the insulator 5, the element 2 is fixed to the metal fitting 8, and the insulator 5 Has a neck portion 5b at the center and a collar portion 5a at the other end, and the sleeve 4 is fitted into the insulator 5 within the neck portion 5b of the insulator 5, and the sleeve 4 and the insulator 5 are fastened to each other. The ball-shaped objects 12 and 13 are provided as a structure, and the metal fitting 8 is engaged with the insulator 5 so as to hold the collar portion 5a of the insulator 5, and is movable so as to come into contact with either the sleeve 4 or the insulator 5. And a structure in which the metal fitting 8 can be held by either the sleeve 4 or the insulator 5 by the ball-shaped material 12 or 13. It is.

As shown in FIG. 4, the sectional shape of the metal fitting 8 is
The U-shaped tip portion is bent so that the tops of the tip portions face each other. Further, the tip portion was divided and manufactured (not shown), and the insulator 5 was engaged and then press-fitted to be integrated so as to hold the collar portion 5a of the insulator 5. In addition, a boss 8c having a substantially equal outer shape is provided on the inner diameter of the element 2 [(FIG. 4 (a) and FIG.
(B)].

As shown in FIG. 1, a sleeve 4 made of a resin composition having a conductive surface treatment was used, and a ball-shaped material 13 as a fastener was embedded at the time of sleeve molding.
The length of the sleeve 4 is shorter than that of the insulator 5.

The insulator 5 has a divided structure (not shown) so that the sleeve 4 can be fitted in the neck portion 5b of the insulator 5, and the sleeve is fitted and then screwed to be integrated. Further, the ball-shaped material 12 as a fastener was embedded during the insulator molding.

The operation of the separation type structure shown in FIG. 1 at the time of expansion will be described. At the time of extension, the element 1 that functions as an antenna transmits a power reception signal to the holder 6 that is the original feeding point through the stopper 7 (FIG. 3) and functions as an antenna.

At this time, as an operation for extending the antenna of the present invention, the top portion 3 having the element 2 which serves as the antenna when housed therein is pulled up. When pulling up the top part 3, the element 2 becomes an antenna when stored.
The retaining portion 8a of the mounting metal fitting 8 is caught by the collar portion 5a of the insulator 5, and the insulator 5 is lifted to raise the insulator 5 [by the distance of the gap 11 (FIG. 2) between the insulator 5 and the conductive sleeve 4]. To form. Therefore, the element 1 which is fixed to the insulator 5 and serves as an antenna when expanded is separated from the conductive sleeve 4 by the distance of the gap 10 and is separated from the element 2 which serves as an antenna during storage.

The operation of the separating structure during storage will be described with reference to FIG. As an operation for housing the antenna of the present invention, the top molding portion 3 is pushed downward. At this time, the top part 3 is the inner top surface 8 of the mounting bracket of the antenna when stored.
The flange portion 5a of the insulator 5 is pushed down by b, and the gap 10 formed at the time of extension disappears, and conversely, the gap 11 is formed. Therefore, as in the case of extension, the conductive sleeve 4
The element 1 serving as an antenna at the time of extension inside the insulator 5 is separated by a distance of from the gap 11 to separate the antenna at the time of extension and at the time of storage.

The mounting metal fitting 8 of the element 2 which serves as an antenna at the time of storage and when extended and stored respectively,
The final positioning when moving up and down and during extension and storage is when the pulling or pushing operation is stopped, and when extending, the ball passes through the ball-shaped material 13 and comes into contact with the ball-shaped material 12, and when stored. On the contrary, the ball-shaped object 12
To reach the position where the ball-shaped material 13 is contacted (see FIG.
And Figure 2).

In the present embodiment, the helical coil type element is used as the element at the time of storage, but even if the coaxial type dielectric resonator is used [FIG. 4 (a)], the effect is changed in principle. Absent.

In this embodiment, a sleeve made of a resin composition having a conductive surface treatment has been described, but the same effect can be obtained by using a sleeve made of an aluminum alloy or a magnesium alloy.

[0032]

According to the present invention, the bending and bending of the insulator portion made of nylon or the like that mechanically connects the antenna elements during extension and storage is reduced by the antenna structure of the present invention. These make it possible to provide an antenna with improved quality. That is, according to the present invention, it is possible to provide an antenna that is unlikely to be bent or bent when bent.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a state when an antenna is extended.

FIG. 2 is an explanatory diagram showing a state when the antenna is stored.

FIG. 3 is an explanatory diagram showing the entire separation type antenna when it is extended.

FIG. 4 is a diagram showing the relationship between the shape of the metal fitting and the element, FIG.
4A is a cross-sectional view of the metal fitting and the helical coil type element, FIG. 4B is an external perspective view of the metal fitting, and FIG. 4C is a cross-sectional view of the metal fitting and the dielectric resonator.

5A and 5B are views showing a conventional separation type antenna, FIG. 5A is an external perspective view showing the whole, and FIG. 5B is an explanatory view showing a separation structure.

[Explanation of symbols]

1, 2 Element 3 Top (molding) part 4 (Conductive) sleeve 41 (Conventional conductive) Sleeve 5 (Insulator) Insulator 5a (Insulator) Collar 5b (Insulator) Neck 51 (Conventional) Insulator 6 Holder 7 Stopper 8 (Mounting) Metal fitting 8a (Metal fitting) Retaining part 8b (Metal fitting) Inner upper surface 8c (Provided on metal fitting) Boss 10 (Gap between insulator and sleeve when antenna is pulled out) 11 ( Gap between insulator and sleeve when housing antenna 12 Ball-shaped object 13 (for fastener provided on insulator) Ball-shaped object 14 (for fastener provided on sleeve) Coaxial dielectric resonator 20 Main body of communication device

Claims (10)

(57) [Claims] 1. An antenna having a plurality of antenna elements, a conductive sleeve that serves as a feeding point of the antenna, and an insulator that mechanically couples the antenna elements to each other to electrically insulate the antenna elements. One antenna element is fixed to one end of the insulator, the other antenna element is fixed to a metal fitting, the insulator has a neck portion in the central portion and a collar portion at the other end, and the sleeve is the insulator. In the neck of the insulator, the sleeve and the insulator are provided with fasteners, the metal fitting is engaged with the insulator to hold the collar portion of the insulator, and the sleeve is moved. And a structure capable of contacting any of the insulators, and A separated antenna, comprising a structure capable of holding a tool on either the sleeve or the insulator by a fastener. 2. The separation type antenna according to claim 1, wherein the resonance frequencies of the plurality of antenna elements are different. 3. One of the plurality of antenna elements
3. The separation type antenna according to claim 1, wherein the antenna element is a dielectric resonator. 4. One of the plurality of antenna elements
The separate type antenna according to any one of claims 1 to 3, wherein the antenna element is made of a shape memory alloy. 5. The separation type antenna according to claim 3, wherein the dielectric resonator is a coaxial type dielectric resonator. 6. The separation according to claim 1, wherein a cross-sectional shape of the metal fitting is a shape in which a U-shaped tip portion is bent so that tops of the tip portions face each other. Type antenna. 7. The separation type antenna according to claim 1, wherein said metal fitting is provided with a boss for fixing an antenna element. 8. The detachable antenna according to claim 1, wherein the fastener is made of a ball-shaped material. 9. The separation type antenna according to claim 1, wherein the sleeve has a length shorter than that of the insulator. 10. The sleeve is an aluminum alloy,
The separation type antenna according to any one of claims 1 to 9, which is made of either a magnesium alloy or a resin composition having a conductive surface treatment.