JPH0514026A - Antenna system for radio telephone set - Google Patents

Abstract

PURPOSE:To realize the antenna system for the radio telephone set very suitable when the single radio telephone set is used for an automobile use telephone set, a portable telephone set or a desk mount telephone set or the like by fitting a non-ground type rod antenna element to a case of the radio telephone set removably in a raised/laid way. CONSTITUTION:A cylindrical conductive coupling body 13 is fitted turnably in the vicinity of the entrance of an antenna element container 12 of a radio telephone set case 1, an antenna element throughhole 15 is provided at a projection 13a at the outside of the case, a rod antenna element 11 is inserted slidably into the antenna element throughhole 15 and at least its base is conductive electrically to the said throughhole 15, a means to lead the rod antenna element 11 into the antenna element container 12 through the throughhole 15 is provided, one end of a static capacitance coupler 23 is arranged near the projection 13b so as to be coupled electrostatistically with the projection 13b in the case of the conductive coupling body 13 and the other end is connected to a radio telephone set antenna circuit 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device for a non-grounded radio telephone suitable as an antenna device used in a versatile radio telephone widely used for automobiles, portables, desks and the like.

[0002]

2. Description of the Related Art In recent years, the development and use of wireless telephones for automobiles have been rapidly progressing. Recently, there has been a growing demand for the above-mentioned automobile wireless telephones to be used not only as a dedicated vehicle, but also as a so-called portable wireless telephone such as a handheld te type or a shoulder type or a desk-top wireless telephone. is there.

In order to meet such a demand, it is necessary to attach a non-grounded antenna device to the main body of the radio telephone in addition to the vehicle-mounted antenna device mounted on the automobile. Moreover, it is desirable that the antenna element is a type of antenna device that is attached to the main body of the wireless telephone so that it can be inserted into and removed from the main body of the wireless telephone and can be fallen over.

[0004]

As a conventionally known antenna device of this type, there is a device in which a rod-shaped non-grounded antenna element is attached to a radio telephone case so as to be retractable and retractable. There is also a wireless telephone case that is mounted so as to be able to fall down about its base end. However, there is no one in which a rod-shaped non-grounded antenna element is attached to a wireless telephone case so that it can be freely inserted and removed and fallen down. In the case where the antenna device is attached to the wireless telephone case so as to be laid down, generally, a rotary coaxial connector is used, and the antenna element is laid down parallel to the outer surface of the case from the state of 90 ° or 180 °. It can be rotated to stand upright with respect to the outer surface of the case. Therefore, in this type of antenna device, the antenna element diameter is relatively large, and the rotary coaxial connector has a mode in which it largely projects from the surface of the case. As a result, the size and shape of the antenna device becomes large, which is an obstacle to the handling and operation of the wireless telephone, and the weight is heavy.

Therefore, an object of the present invention is that a non-grounded rod-shaped antenna element can be attached to a radio telephone case so that it can be inserted into and removed from the radio telephone case, and can be fallen over. The axis of the rotating mechanism does not protrude from the surface of the case, and the antenna element diameter may be small so that it can be manufactured in a small size and light weight, and the required antenna characteristics can be stably maintained for a long period of time. Therefore, it is an object of the present invention to provide a non-grounded antenna device for a wireless telephone, which is extremely suitable when a single wireless telephone is selectively used for an automobile, a mobile phone, a desk, etc.

[0006]

In order to solve the above problems and achieve the object, the following measures were taken in the present invention.

[0007] A cylindrical conductive coupling member rotatably mounted near the entrance of the antenna element housing portion in the radio telephone case, and a shaft center of the coupling member on the outside projection of the conductive coupling member. An antenna element insertion hole provided in a direction orthogonal to each other, and a rod-shaped antenna element slidably inserted into the antenna element insertion hole and at least a base end portion of which is provided so as to be electrically conductive with the antenna element insertion hole. When,
A means for setting the rotation angle of the conductive coupling body so that the rod-shaped antenna element can be inserted into and pulled out from the antenna element housing through the antenna element insertion hole, and a protrusion in the case of the conductive coupling body. An electrostatic coupler, one end of which is arranged close to the protrusion so as to be electrostatically coupled, and the other end of which is connected to an antenna circuit in the wireless telephone.

[0008] A series resonance section composed of the capacitance in the electrostatic coupling section including the conductive coupling member and the electrostatic coupling element and the residual inductance of the antenna element, and a parallel resonance section of the antenna circuit in the wireless telephone. However, a constant K-type bandpass filter is formed for the frequency band used.

[0009]

As a result of taking the above-mentioned means, the following effects occur. The non-grounded rod-shaped antenna element can be removably attached to the case of the wireless telephone by the function of the conductive coupling body so that the antenna element can be folded up and down, which is suitable for the versatility of the wireless telephone. Further, since the present antenna device is a non-grounded antenna device, it does not require a conventional rotary coaxial connector as a rotating mechanism, and can be configured by a simple rotary connector. Therefore, the axis of the rotating mechanism does not protrude from the surface of the case, and the antenna element may have a small diameter. Therefore, it can be manufactured small and lightweight. Moreover, the antenna element side and the antenna circuit side of the wireless telephone are connected by the electrostatic coupling portion formed of a contactless rotary connector.
Therefore, there is almost no wear and it is highly durable and
Since the earth side has nothing to do with the rotating part, there is no possibility of "contact failure due to wear" or the like. Therefore, generation of noise and signal breakage are prevented, and reliability is improved. Further, since the electrostatic coupling portion has a broad characteristic, even if some mechanical rattling occurs, the overall characteristic does not deteriorate. Thus, an extremely suitable antenna device can be obtained when a single wireless telephone is used for automobiles, mobile phones, and desks.

On the other hand, since the present antenna device 4 is a non-grounded type antenna device constructed by using a constant K type band filter, an antenna device having a wider band characteristic than the conventional antenna device can be obtained.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a diagram showing a mode of use of a non-grounded antenna device for a wireless telephone according to an embodiment of the present invention.

FIG. 1A is a diagram showing a mode of an antenna device when the radio telephone RT is used for an automobile. Reference numeral 1 is a wireless telephone case, 2 is a handset, 3 is a vehicle-mounted antenna connection cable, and 4 is an antenna device. As shown in the figure, the antenna device 4 is configured such that the antenna element 11 is housed in the antenna element housing portion of the wireless telephone case 1. When the in-vehicle antenna connection cable 3 is connected to the wireless telephone case 1 via the cable connector 5,
The antenna device 4 is automatically disconnected from the antenna circuit (not shown) of the radio telephone RT, and instead, the vehicle-mounted antenna (not shown) is connected to the antenna circuit of the radio telephone RT.

FIG. 1B is a diagram showing a mode of an antenna device when the radio telephone RT is used as a portable device. 6 is a shoulder belt. As shown in the figure, the antenna device 4 has a mode in which the antenna element 11 is pulled out of the wireless telephone case 1. The vehicle-mounted antenna connection cable 3 has been removed.

FIG. 1C is a diagram showing a mode of an antenna device when the radio telephone RT is used for desk. As shown in the figure, the antenna device 4 has a configuration in which the antenna element 11 is pulled out of the case 1 and then rotated by 90 °. The vehicle-mounted antenna connection cable 3 has been removed. FIG. 2 is a diagram more specifically showing three modes of the antenna device 4 corresponding to (a) to (c) of FIG. 1.

When the radio telephone RT is used for an automobile as shown in the figure, the antenna element 11 is pushed into the radio telephone case 1 as shown in FIG. Become. When the radio telephone RT is used as a portable device, the antenna element 1
As shown in [B], 1 is a mode in which it is drawn out of the wireless telephone case 1 and extended. Further, when the radio telephone RT is used for desk, the antenna element 11 is [B]
Similarly to the above, after being pulled out to the outside of the wireless telephone case 1, it is rotated 90 ° as shown in [C] and extended to the upright state. When the antenna element 11 is to be housed in the case 1 from the mode [C], the mode [B] is once established, and then the mode [A] is operated.

3 and 4 are diagrams showing a detailed structure of the antenna device 4. As shown in FIG. As shown in FIGS. 3 and 4, the entrance 12 of the antenna element housing portion 12 of the wireless telephone case 1
A cylindrical conductive coupling body 13 is rotatably attached to the case 1 in the vicinity of a. That is, the shaft portion 13c at the central portion of the conductive coupling body 13 is attached to the case wall portion 1
It is attached so as to rotatably penetrate a. The case outer protruding portion 13a of the columnar conductive coupling body 13 has a large diameter head, and the entire head is covered with an insulating cover 14. An antenna element insertion hole 15 is provided in the case outer protruding portion 13a of the conductive coupling body 13 through the insulating cover 14 in a direction orthogonal to the axis of the coupling body 13. Rod-shaped antenna element 1
1 is slidably inserted into the antenna element insertion hole 15. As shown in FIG. 4, a conductive spring member 16 is attached to the outer circumference of the base end of the antenna element 11 so that at least the base end of the antenna element 11 can be electrically connected to the inner surface of the antenna element insertion hole 15. There is. Reference numeral 17 denotes a case-shaped protruding portion 13 a of the cylindrical conductive coupling body 13 and the insulating cover 1.
4 is a lock screw that fixes the antenna element 11 and 4 together and prevents the antenna element 11 from coming off. Reference numeral 18 is an elastic spring, and 19 is a locking ball. The ball 19 slightly protrudes from the surface of the conductive coupling body 13 facing the case and engages with the bowl-shaped recesses 20 (20a to 20d) provided on the surface of the case. It is a match. Reference numeral 21 is an E-ring that is fitted into the in-case projecting portion 13b of the columnar conductive coupling body 13 and is used to prevent coming off. Therefore, the columnar conductive coupling body 1
3 and the rotating mechanism portion 22 including the insulating cover 14 and the like,
The rotation position is specified as the position where the locking ball 19 and the bowl-shaped recess 20 engage with each other. That is, the rotation mechanism section 22 is rotated, and the antenna element 11 is moved to the position shown in FIG.
[B] or [C], the engagement between the locking ball 19 and the bowl-shaped recess 20 occurs at this position. Therefore, the rotation mechanism section 22 is stably held at the angular position. Thus, the antenna element insertion hole 15
The rotation angle of the conductive coupling body 13 can be set and operated so that the rod-shaped antenna element 11 inserted therein can be inserted into and drawn out from the antenna element housing portion 12 as needed. .

As shown in FIGS. 3 and 4, one end of the electrostatic coupling 23 is arranged close to the protruding portion 13b so that the conductive coupling body 13 is electrostatically coupled to the in-case protruding portion 13b. Has been done. The shape of the electrostatic coupler 23 is preferably partially ring-shaped or flat. The other end of the electrostatic coupler 23 is connected to the antenna circuit 25 in the radio telephone RT.

Projecting portion 1 in the case of the conductive coupling body 13
3b and a series resonance part including the electrostatic capacitance in the electrostatic coupling part 24 including the electrostatic coupling 23 and the residual inductance of the antenna element 11, and the antenna of the wireless telephone whose one end is connected to the electrostatic coupling 23. The parallel resonance section of the circuit 25 is configured to form a constant K-type bandpass filter for the frequency band used. A non-grounded antenna is realized by the existence of the parallel resonance section.

According to this embodiment described above, the following operational effects can be expected. Due to the function of the conductive coupling body 13, the non-grounded bar-shaped antenna element 11 can be attached to the radio telephone case 1 so as to be insertable / removable and laid down. Therefore, it is suitable for the versatility of the radio telephone RT. Further, since the antenna device 4 of the present embodiment is a non-grounded antenna device, it does not require a rotating coaxial connector as in the prior art as a rotating mechanism, and can be configured by a simple rotating connector. Therefore, the shaft of the rotating mechanism does not project from the surface of the case 1. The antenna element 11 may also have a small diameter. Therefore, it can be manufactured small and lightweight. Moreover, the antenna element 11 side and the radio telephone RT
The antenna circuit 25 side is connected by the electrostatic coupling section 24 formed of a contactless rotary connector. Therefore, there is almost no wear and it is highly durable, and since the ground side has nothing to do with the rotating part, "contact failure due to wear"
There is no fear of Therefore, generation of noise and signal breakage are prevented, and reliability is improved. Further, since the electrostatic coupling portion 24 has a broad characteristic, even if some mechanical rattling occurs, it does not lead to deterioration of the entire characteristic. Thus, an extremely suitable antenna device can be obtained when the single radio telephone RT is selectively used for automobiles, mobile phones, desks and the like.

On the other hand, since the antenna device 4 is a non-grounded antenna device constructed by using a constant K type bandpass filter, it is, for example, 150 MHz as compared with the conventional antenna device.
It is possible to obtain an antenna device having an extremely wide band characteristic which can be adapted to a used bandwidth of a certain degree. The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various modifications can be made without departing from the gist of the present invention.

[0021]

According to the present invention, the bar-shaped antenna element is held by the rotatable conductive coupling body having the antenna insertion hole, and the coupling body is connected to the antenna circuit of the wireless telephone by electrostatic coupling. Since it is configured as described above, the non-grounded bar-shaped antenna element can be attached to the wireless telephone case in such a manner that it can be inserted / removed and fallen down. The shaft does not protrude from the case surface, the antenna element diameter may be small, and it can be manufactured in a small size and light weight, and the required antenna characteristics can be stably maintained for a long period of time. It is possible to provide an extremely suitable non-grounded antenna device for a wireless telephone when the wireless telephone is selectively used for automobiles, mobile phones, desks, and the like.

[Brief description of drawings]

FIG. 1 is a diagram showing a mode of use of a non-grounded antenna device for a wireless telephone according to an embodiment of the present invention.

FIG. 2 is a diagram showing in detail three modes of the antenna device corresponding to FIGS. 1 (a) to 1 (c).

FIG. 3 is a diagram showing a part of the configuration of the antenna device according to the embodiment.

FIG. 4 is a diagram showing another part of the configuration of the antenna device according to the embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Wireless telephone case, 2 ... Handset, 3 ... In-vehicle antenna connection cable, 4 ... Antenna device, 5 ... Cable connector, 6 ... Shoulder belt, 11 ... Rod-shaped antenna element, 12 ... Antenna element storage part, 13 ... Conductive bond,
14 ... Insulation cover 15 ... Antenna element insertion hole, 16 ... Conductive spring member, 17 ... Lock screw, 18 ... Elastic spring, 1
9 ... Locking balls, 20 ... Bowl-shaped recesses, 21 ... E-rings for retaining, 22 ... Rotating mechanism section, 23 ... Electrostatic coupler, 2
4 ... Electrostatic coupling part, 25 ... Antenna circuit, RT ... Wireless telephone.

Claims (2)

[Claims] 1. A columnar conductive coupling body rotatably mounted near the entrance of an antenna element housing section in a radio telephone case, and a shaft center of the coupling body at a case outside projection of the conductive coupling body. And an antenna element insertion hole provided in a direction orthogonal to the antenna element, and a rod shape slidably inserted into the antenna element insertion hole and at least a base end portion of which is provided so as to be electrically conductive with the antenna element insertion hole. An antenna element, a means for setting the rotation angle of the conductive coupling body so that the rod-shaped antenna element can be inserted into and withdrawn from the antenna element housing portion through the antenna element insertion hole, and a protrusion of the conductive coupling body in a case. And an electrostatic coupler whose one end is disposed close to the above-mentioned protruding portion so as to be electrostatically coupled to the part and whose other end is connected to the antenna circuit in the wireless telephone. Phone antenna apparatus. 2. A series resonance unit formed of a capacitance in an electrostatic coupling unit including the conductive coupling body and the electrostatic coupling unit and a residual inductance of the antenna element, and a parallel resonance unit of an antenna circuit in the wireless telephone. 2. The antenna device for a wireless telephone according to claim 1, wherein and are configured so as to form a constant K-type bandpass filter for the frequency band used.