WO2001052350A1

WO2001052350A1 - Antenna device

Info

Publication number: WO2001052350A1
Application number: PCT/JP2001/000063
Authority: WO
Inventors: Kiyoshi Egawa; Hideo Ito
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2000-01-11
Filing date: 2001-01-10
Publication date: 2001-07-19
Also published as: JP3527451B2; JP2001196822A; AU2547301A

Abstract

An antenna device of diversity structure comprising a whip antenna having a monopole antenna (102) and a helical antenna (302) and a built-in loop antenna (105) contained in a case (107) of a mobile radio device, wherein a gap holding member (304) forms a small capacitance gap between a power feed spring (104) and the helical antenna (302) through an antenna holder (103) when the base of the helical antenna (302) is placed into contact with the antenna holder (103), whereby the coupling of antennas of diversity structure hardly exerts influence, and consequently realizing a high gain.

Description

Description Antenna device Technical field

The present invention relates to an antenna device used for a device and mainly used for a mobile radio device such as a mobile phone in a mobile communication system or an information terminal device having a computer function, and particularly relates to a coupling between a whip antenna and a built-in antenna. The present invention relates to an antenna device having a structure for preventing a gain from being deteriorated. Background art

Conventionally, as this type of antenna device, there is an antenna device described in Utility Model Registration No. 30143478.

FIG. 1 is a configuration diagram of a portable mobile radio device equipped with a conventional antenna device.

The antenna device shown in FIG. 1 includes an antenna base 11, a monopole antenna 12, an insulator 13, a spiral antenna 14, a resin mold 15, an antenna holder 16, and a power supply panel 17. And a built-in loop antenna 18 and a balanced-unbalanced conversion element 19.

A helical antenna 14 is fixed to a tip of a rod-shaped monopole antenna 12 having an electric length of an arbitrary length fixed to the antenna base 11 via a cylindrical insulator 13. The spiral antenna 14 is covered with a cylindrical case-shaped resin mold 15 and hermetically sealed, and the monopole antenna 12 is made up of a mobile radio device housing 20 and a metal antenna holder 16 to form an outer case 2. The antenna 1 is held so as to be sandwiched between the inside and the outside, and a part of the antenna holder 16 contacts the power supply panel 17 to be connected to the wireless circuit 22. That is, power is supplied to the monopole antenna 12 from the wireless circuit 22 via the power supply spring 17 and the antenna holder 16.

On the other hand, the built-in loop antenna 18 is fed with power from the radio circuit 22 which is an unbalanced circuit, after being converted into balanced power by the balanced-unbalanced conversion element 19, whereby the monopole antenna 10 Diversity reception can be performed between the two, and stable communication can be realized.

However, in the conventional device, the built-in loop antenna 18 is installed on the housing 20 at a distance of about 3 to 4 mm from the monopole antenna 12, and the monopole antenna 12 is attached to the housing 2. For the antenna holder 16 for holding at 0, a cylindrical metal having a diameter of about 7 mm is used.

For this reason, the distance between the outer peripheral surface of the antenna holder 16 and the built-in loop antenna 18 is extremely short, and as a result, there is a strong reception band between the monopole antenna 12 and the built-in loop antenna 18 in the reception band. There is a problem that coupling (large coupling amount) occurs and the antenna gain of both is deteriorated.

Specifically, as shown in the pass loss (coupling amount) characteristics between the monoball antenna 12 and the built-in loop antenna 18 in Fig. 2, the reception bandwidth at the time of diversity indicated by markers 1 and 3 The transmission loss is about 3 to 5 dB larger than the transmission band indicated by markers 1 and 2. Disclosure of the invention

An object of the present invention is to provide an antenna device capable of realizing high gain by reducing the influence of coupling between antennas of a diversity configuration.

This object is achieved by reducing the diameter of the antenna holder as much as possible, and by forming a capacitance between the feeding spring and the monopole antenna or the helical antenna by a minute capacitance gap. BRIEF DESCRIPTION OF THE FIGURES

Fig. 1 is a block diagram of a portable mobile radio device equipped with a conventional antenna device. Fig. 2 is a characteristic diagram of a passing loss (coupling amount) between a monopole antenna and a built-in loop antenna in a conventional antenna device. ,

FIG. 3 is a configuration diagram of a portable mobile wireless device equipped with the antenna device according to Embodiment 1 of the present invention,

FIG. 4 is a characteristic diagram of a passing loss (coupling amount) between the monopole antenna and the built-in loop antenna in the antenna device according to Embodiment 1 of the present invention.

FIG. 5 is a configuration diagram of a portable mobile wireless device equipped with the antenna device according to Embodiment 2 of the present invention,

FIG. 6 is a configuration diagram of a portable mobile wireless device equipped with the antenna device according to Embodiment 3 of the present invention,

FIG. 7 is a configuration diagram of a portable mobile wireless device equipped with the antenna device according to Embodiment 3 of the present invention,

FIG. 8 is a configuration diagram of a portable mobile wireless device equipped with the antenna device according to Embodiment 4 of the present invention,

FIG. 9 is a configuration diagram of a portable mobile radio device equipped with an antenna device according to Embodiment 4 of the present invention,

FIG. 10 is a configuration diagram of a portable mobile wireless device equipped with the antenna device according to Embodiment 5 of the present invention,

FIG. 11 is a configuration diagram of a portable mobile wireless device equipped with an antenna device according to Embodiment 5 of the present invention,

FIG. 12 is a configuration diagram of a portable mobile radio device equipped with an antenna device according to Embodiment 6 of the present invention, and

FIG. 13 is a configuration diagram of a portable mobile radio device equipped with the antenna device according to Embodiment 6 of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)

FIG. 3 is a configuration diagram of a portable mobile wireless device equipped with the antenna device according to Embodiment 1 of the present invention.

The antenna device according to the first embodiment shown in FIG. 3 includes an antenna base 101, a monopole antenna 102, an antenna holder 103, a feeding spring 104, and a built-in loop antenna 100. 5 and a balance-unbalance conversion element 106. A rod-shaped monopole antenna 102 having an electric length of an arbitrary length fixed to the antenna base 101 is attached to the housing 107 of the mobile radio apparatus, and a metal cylindrical antenna holder 103 is attached. The outer case 108 is held so as to sandwich it from the inside and the outside. Then, a part of the antenna holder 103 comes in contact with the power supply panel 104 to be connected to the wireless circuit 109.

That is, power is supplied to the monopole antenna 102 from the wireless circuit 109 via the power supply spring 104 and the antenna holder 103.

On the other hand, the internal loop antenna 105 is fed after the power from the wireless circuit 109, which is an unbalanced circuit, is converted into the balanced power by the balanced-unbalanced conversion element 106. As a result, diversity reception can be performed with the monopole antenna 102, and stable communication can be realized.

Here, it has been found that the strength is sufficient even if the diameter of the antenna holder 103, which is about 7 mm in the related art with the cylindrical metal member, is reduced to 6 mm 1 mm.

In this way, by making the diameter of the antenna holder 103 as small as possible, the distance between the outer peripheral surface of the antenna holder 103 and the built-in loop antenna 105 can be made as long as possible. 2 and built-in loop antenna 1 0 5, the amount of coupling between the antennas in the reception band of 5 becomes smaller by that amount, and the antenna gain of both antennas can be improved.

More specifically, as shown in the pass loss (coupling amount) characteristics between the monopole antenna 102 and the built-in loop antenna 105 in FIG. The reception band at the time of diversity indicated by 4 is a pass loss difference of about 2 to 3 dB compared to the transmission band indicated by markers 1 and 2, which is smaller than the conventional one shown in Fig. 2. The transmission loss is improved by about 15 dB compared to the conventional one.

(Embodiment 2)

FIG. 5 is a configuration diagram of a portable mobile wireless device equipped with the antenna device according to Embodiment 2 of the present invention. However, in the mobile radio apparatus shown in FIG. 5, the same components as those of the mobile radio apparatus shown in FIG. 3 are denoted by the same reference numerals as in FIG. 3, and the description thereof will be omitted.

The antenna device according to the second embodiment shown in FIG. 5 is different from the antenna device according to the first embodiment shown in FIG. 3 in that an insulating material such as ABS resin is used instead of the metal antenna holder 103. The antenna base 101 to which the monopole antenna 102 is fixed is held in the housing 107 by using the antenna holder (resin holder) 201 by the antenna base 101. That is, it is directly connected to the power supply panel 104.

According to such a configuration, since the resin holder 201 is an insulator, the monopole antenna 102 is connected to the built-in loop antenna 105 via the antenna holder 103 as in Embodiment 1. Instead of coupling, the antenna base 101 to which the monoball antenna 102 is fixed and the built-in loop antenna 105 are coupled.

That is, the distance between the antenna base 101 and the built-in loop antenna 105 is equal to the distance between the antenna holder 103 and the built-in loop antenna 105 in the first embodiment. Therefore, the distance between the monopole antenna 102 and the built-in loop antenna 105 also increases. Therefore, the amount of coupling between the monopole antenna 102 and the built-in loop antenna 105 in the reception band is reduced, and the antenna gain of both can be improved.

(Embodiment 3)

6 and 7 are configuration diagrams of a portable mobile wireless device equipped with the antenna device according to Embodiment 3 of the present invention. FIG. 6 shows a state where the whip antenna is extended, and FIG. Indicates storage. However, in the mobile radio apparatus shown in FIGS. 6 and 7, the same components as those of the mobile radio apparatus shown in FIG. 3 are denoted by the same reference numerals as in FIG. 3, and description thereof will be omitted.

The antenna device according to the third embodiment shown in FIGS. 6 and 7 is different from the antenna device according to the first embodiment shown in FIG. 3 in that a monopole antenna 102 has a cylindrical insulator 3 The spiral antenna 300 is fixed through the antenna 01, and the spiral antenna 300 is covered with a resin mold 303 of a cylindrical case and hermetically sealed, and the monopole antenna 102 and the spiral antenna 302 are sealed. A whip antenna configuration that can be freely moved up and down by being housed in the housing 107 via the antenna holder 103 is provided, and an insulating material is provided between the feeding panel 104 and the antenna holder 103. The gap holding jig 304 was interposed.

As shown in FIG. 7, when the whip antenna is housed, the gap holding jig 304 is connected to the feeding spring 104 when the base of the spiral antenna 302 is placed in contact with the antenna holder 103. This is for forming a minute capacitance gap between the antenna and the spiral antenna 302 via the antenna holder 103.

In such a configuration, when the whip antenna shown in FIG. 6 is extended, a signal from the wireless circuit 109 is fed to the antenna base 101 via the feed panel 104, whereby Power is supplied to the pole antenna 102.

On the other hand, when the whip antenna shown in FIG. However, a capacitance is formed between the feeding spring 104 and the spiral antenna 302 by a minute capacitance gap formed by the gap holding jig 304, and the capacitive coupling causes the spiral antenna 304 to move. Power is supplied to 2. That is, the spiral antenna 302 operates as an antenna when the spiral antenna 302 is loaded with the capacitance in series. In this way, by forming a small-capacity gap between the feeding spring 104 and the spiral antenna 302 via the antenna holder 103, the spiral antenna 302 and the built-in loop are stored when the whip antenna is stored. Since the amount of coupling between antennas in the reception band with antenna 105 can be reduced, the antenna gain of both antennas can be improved.

Note that, as in the first embodiment, the distance between the outer peripheral surface of the antenna holder 103 and the built-in loop antenna 105 can be made as long as possible by making the diameter of the antenna holder 103 as small as possible. Therefore, the amount of coupling between the antennas in the reception band between the monopole antenna 102 and the built-in loop antenna 105 is reduced accordingly, and the antenna gains of both can be improved.

(Embodiment 4)

8 and 9 are configuration diagrams of a portable mobile radio device equipped with the antenna device according to Embodiment 4 of the present invention. FIG. 8 shows a state where the whip antenna is extended, and FIG. Indicates time. However, in the mobile radio device shown in FIGS. 8 and 9, the same components as those of the mobile radio device shown in FIGS. 6 and 7 are denoted by the same reference numerals as in FIGS. 6 and 7, and the description thereof is omitted. .

The antenna device of the fourth embodiment shown in FIGS. 8 and 9 is different from the antenna device of the third embodiment shown in FIGS. 6 and 7 in that an ABS resin is used instead of the metal antenna holder 103. By using an antenna holder (resin holder) 201 made of an insulating material such as the above, the gap holding jig 30 is caused by causing the resin holder 201 to function as a gap holding jig 304 (see FIGS. 6 and 7). The antenna base 101 is directly connected to the feed panel 104 when the whip antenna is extended. That's what I did.

When the whip antenna shown in FIG. 8 is extended, the signal from the wireless circuit 109 is supplied to the antenna base 101 via the power supply spring 104, thereby supplying the monopole antenna 102. Is performed.

On the other hand, when the whip antenna shown in FIG. 9 is housed, a signal is generated from the wireless circuit 109 and a capacitance is generated by the minute capacitance gap formed by the resin holder 201. Power is supplied. That is, the spiral antenna 302 operates as an antenna by loading the capacitance in series with the spiral antenna 302.

According to such a configuration, since the resin holder 201 is an insulator, when the whip antenna is extended, as in Embodiment 3, the monopole antenna 102 is connected to the built-in loop via the antenna holder 103. Instead of being coupled to the antenna 105, the antenna base 101 to which the monopole antenna 102 is fixed is coupled to the built-in loop antenna 105.

That is, the distance between the antenna base 101 and the built-in loop antenna 105 is longer than the distance between the antenna holder 103 and the built-in loop antenna 105 in the third embodiment. The distance between 1 ◦ 2 and the built-in loop antenna 105 also becomes longer. Therefore, the amount of coupling between the monopole antenna 102 and the built-in loop antenna 105 in the reception band is reduced, and the antenna gain of both can be improved.

Also, when the whip antenna is stored, the spiral antenna 302 is not coupled to the built-in loop antenna 105 via the antenna holder 103 as in the third embodiment, but to the base of the spiral antenna 302. The loop antenna 105 is coupled.

That is, the distance between the base of the spiral antenna 302 and the built-in loop antenna 105 is determined by the distance between the antenna holder 103 and the built-in loop antenna 105 in the third embodiment. Longer than the interval. Therefore, the amount of coupling between the spiral antenna 302 and the built-in rufan 105 in the reception band is reduced, and the antenna gain of both can be improved.

(Embodiment 5)

FIGS. 10 and 11 are configuration diagrams of a portable mobile radio apparatus equipped with an antenna apparatus according to Embodiment 5 of the present invention. FIG. 10 shows a state where a whip antenna is extended. Indicates when the whip antenna is stored. However, in the mobile radio device shown in FIGS. 10 and 11, the same components as those of the mobile radio device shown in FIGS. 6 and 7 are denoted by the same reference numerals as in FIGS. 6 and 7, and the description thereof will be omitted. Omitted.

The antenna device according to the fifth embodiment shown in FIGS. 10 and 11 is different from the antenna device according to the third embodiment shown in FIGS. 6 and 7 in that the gap holding jig 30 shown in FIGS. Only when the four whip antennas are stored, a small capacitance gap is provided between the feeding spring 104 and the spiral antenna 302 via the antenna holder 103, In Figs. 10 and 11, when the whip antenna is extended or retracted, a small capacitance is placed between the feeding spring 702 and the monoball antenna 102 or the spiral antenna 302 via the antenna holder 103. That is, a gap holding jig 701 is provided so as to form a gap.

That is, the feeding spring 72 is formed in such a shape that it is not directly conductively connected to the monopole antenna 102 and the spiral antenna 302 both when the whip antenna is extended and when it is stored. When the whip antenna is extended, the gap holding jig 701 is connected to the antenna holder 103 and the antenna base 101 so as not to be directly connected to the power feeding spring 702 when the whip antenna is extended, as shown in FIG. 0 3 and the antenna base 101 and the power supply spring 720. According to such a configuration, when the whip antenna is extended as shown in FIG. 1, a signal from the wireless circuit 109 is supplied between the feeding spring 70 2 and the monopole antenna 102 by the gap holding jig 7. The capacitance is formed by the minute capacitance gap due to 01 and this capacitance coupling In some cases, power is supplied to the monopole antenna 102. That is, the monopole antenna 102 operates as an antenna by loading the capacitance in series with the monopole antenna 102.

In addition, when the whip antenna shown in FIG. 11 is housed, a small capacitance gap forms a capacitance between the signal from the wireless circuit 109 and the power feeding panel 702 and the spiral antenna 302, and this capacitive coupling occurs. Thus, power is supplied to the spiral antenna 302. That is, the spiral antenna 302 operates as an antenna by loading the capacitance in series with the spiral antenna 302.

In this way, a minute capacity gap is formed between the feed spring 70 2 and the monopole antenna 102 and between the feed spring 104 and the spiral antenna 302 via the antenna holder 103. This makes it possible to reduce the amount of coupling between the antennas in the reception band between the monopole antenna 102 and the spiral antenna 302 and the built-in loop antenna 105 when the whip antenna is extended and retracted. Antenna gain can be improved.

(Embodiment 6)

FIGS. 12 and 13 are configuration diagrams of a portable mobile radio device equipped with the antenna device according to the sixth embodiment of the present invention. FIG. 12 shows a state where the whip antenna is extended. Indicates when the whip antenna is stored. However, in the mobile radio apparatus shown in FIGS. 12 and 13, the same components as those of the mobile radio apparatus shown in FIGS. 10 and 11 are denoted by the same reference numerals as those in FIG. 3, and description thereof will be omitted. I do.

The antenna device of the sixth embodiment shown in FIGS. 12 and 13 is different from the antenna device of the fifth embodiment shown in FIGS. 10 and 1] in that a metal antenna holder 103 is used instead of the metal antenna holder 103. In addition, an antenna holder (resin holder) 201 made of an insulating material such as ABS resin is used, and this resin holder 201 plays the role of a gap holding jig 70 1 (see FIGS. 10 and 11). By doing so, the gap holding jig 701 was lost. That is, the resin holder 201 prevents the antenna base 101 from being directly conductively connected to the feeding spring 720 when the whip antenna is extended as shown in FIG. 12 and when the whip antenna is stored as shown in FIG. It plays the role of forming a minute capacitance gap.

According to such a configuration, when the whip antenna is extended, a signal from the radio circuit 109 is formed between the feeding spring 702 and the monoball antenna 102 by a minute capacitance gap, Power is supplied to the monopole antenna 102 by this capacitive coupling. That is, the monopole antenna 102 operates as an antenna by loading the capacitance in series with the monopole antenna 102.

In addition, when the whip antenna is stored, a signal from the radio circuit 109 forms a capacitance between the feeding panel 702 and the spiral antenna 302 by a minute capacitance gap. Power is supplied to 2. That is, the spiral antenna 302 operates as an antenna by loading the capacitance in series with the spiral antenna 302.

As described above, since the resin holder 201 made of an insulating material is used for the antenna holder, the distance between the monoball antenna 102 or the spiral antenna 302 and the built-in loop antenna 105 becomes long, and the monopole The amount of coupling between the antennas in the reception band between the antenna 102 or the spiral antenna 302 and the built-in loop antenna 105 is reduced, and the antenna gain of both antennas can be improved accordingly. As is clear from the above description, according to the present invention, a high gain can be realized by reducing the influence of the coupling between antennas in the diversity configuration. The present specification is based on Japanese Patent Application No. 2000-0-2003 filed on Jan. 11, 2000. This content is included here. Industrial applicability

The present invention is provided with a mobile phone and a computer function in a mobile communication system. It is suitable for use in mobile radio devices such as information terminal devices.

Claims

The scope of the claims

1. The built-in antenna built into the radio, the monopole antenna, and the monobol antenna are fixed to the radio in a conductive state, and when this is fixed, the coupling between the monopole antenna and the built-in antenna is as small as possible. An antenna device comprising: an antenna holder formed in a predetermined size; and a power supply unit configured to supply power to the monopole antenna via the antenna holder.

2. The antenna device according to claim 1, wherein the antenna holder has a diameter of 6 mm and 1 mm.

3. A built-in antenna built in the radio, a monopole antenna, an antenna holder using an insulating material for fixing the monopole antenna to the radio in a conductive state with the monopole antenna, and conductively connected to the monopole antenna An antenna device comprising: a power supply unit configured to supply power by performing power supply.

4. The antenna device according to claim 3, wherein a resin is used as the insulator material.

5. A built-in antenna built into the radio, a monopole antenna, a helical antenna fixed to an end of the monopole antenna via an insulator, the monopole antenna and the helical antenna, inside and outside the radio It is held in the radio so that it can move freely while being stored / extended, and the amount of coupling between the monopole antenna and the built-in antenna during the expansion is minimized. An antenna holder formed in such a size that the coupling amount with the antenna holder is as small as possible; the antenna holder connected to the monopole antenna via the antenna holder during the extension to supply power; Feed to feed the helical antenna by capacitive coupling due to the capacitive gap formed between An antenna device comprising: a unit; and an interval maintaining unit in which an insulator that forms the capacitance gap is interposed between the antenna holder and the feeding unit.

6. The built-in antenna built into the radio, the monopole antenna, A helical antenna fixed to the tip of the antenna via an insulator; and an insulation for holding the monoball antenna and the helical antenna in the radio so as to be freely movable while being housed / extended inside and outside the radio. An antenna holder made of a body material, connected to the monopole antenna at the time of the extension, to supply power, and a capacitive coupling by the antenna holder interposed between the antenna holder at the time of the storage and the spiral. An antenna device comprising: a power supply unit configured to supply power to an antenna.

7. A built-in antenna built in the radio, a monopole antenna, a helical antenna fixed to an end of the monobolt antenna via an insulator, the monoball antenna and the helical antenna, inside and outside the radio The monolithic antenna and the built-in antenna are held by the wireless device so as to be freely movable while being extended. And a capacity gap formed between the antenna holder formed to have a size that minimizes the amount of coupling with the antenna holder and the antenna holder with which the spiral antenna or the monopole antenna abuts during the storage or extension. Feeding means for feeding power to the spiral antenna or the monopole antenna by coupling; Antenna apparatus comprising a space holding means is interposed, the between the feeding means and the antenna holder an insulator to form a.

8. A built-in antenna built in the radio, a monopole antenna, a helical antenna fixed to the tip of the monopole antenna via an insulator, the monopole antenna and the helical antenna, inside and outside the radio The antenna holder is made of an insulating material that is held by the wireless device so as to be freely movable while being extended, and is interposed between the spiral antenna or the monoball antenna during the storage or extension. And a feeding means for feeding power to the spiral antenna or the monopole antenna by capacitive coupling by the antenna holder.

9. A communication terminal device including an antenna device, wherein the antenna device includes a monopole antenna, a built-in antenna built in the communication terminal device, and the communication terminal device in a conductive state with the monopole antenna. An antenna holder formed so as to minimize the amount of coupling between the monopole antenna and the built-in antenna at the time of fixing, and a feeding unit for feeding power to the monopole antenna via the antenna holder. Have.