JP2000022609A - Portable radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow the portable radio communication equipment to surely avoid interruption of a radio channel in the case that a radio wave obstacle exists in the surrounding of the portable radio communication equipment. SOLUTION: A planar antenna 13 (14) is placed to an upper part of a rear side (lower part of a front side) in a case of a portable telephone set 10B respectively, a transmission circuit 21 of a transmission reception system 20B supplies a transmission signal via a duplexer 25 to both the antennas through a power distribution circuit 27, a reception circuit 22 receives the received signals from both the antennas through a power synthesis circuit 27 and a duplexer. In a speech state where the user uses the portable telephone set by putting the telephone set onto the ear, the planer antenna 13 placed at the upper part of the rear side can send/receive a radio wave. In a data communication state where the telephone set connecting to a portable computer is in use, the planar antenna 14 placed at the lower part of the front side can send/receive a radio wave.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable radio communication device suitable for, for example, a portable telephone.

[0002]

2. Description of the Related Art In recent years, portable telephones using public wireless lines have a high degree of freedom in call positions.
Spreading rapidly.

For example, in a conventional portable telephone 10h as shown in FIG. 8A, a substantially omnidirectional telescopic whip antenna 12h is disposed on the upper surface of a housing 11 formed of an appropriate synthetic resin material. Is done. In a conventional mobile phone 10p as shown in FIG. 8B, a planar antenna 12p having substantially unidirectionality and having a linear cross section is provided at the upper end on the rear side (left side in the figure) inside the housing 11. Will be arranged.

A transmission / reception circuit system 20 described later is mounted inside the housing 11 of the conventional portable telephones 10h and 10p as described above.

[0005] Usually, on the front (right side in the figure) of the housing 11,
Although reference numerals are omitted, openings for a receiver (speaker) and a transmitter (microphone) are formed at upper and lower ends thereof, and operation keys such as dial keys are provided at an intermediate portion. A liquid crystal display element is provided between the operation key and the operation key.

The transmission / reception circuit system 20, as shown in FIG.
A transmitting circuit 21 and a receiving circuit 22 and a matching circuit 23 are provided, and a duplexer 25 is interposed between the matching circuit 23 and the transmitting circuit 21 and the receiving circuit 22.
The transmission circuit 21 and the reception circuit 22 are connected to terminals TX and RX of the duplexer 25, respectively.

Note that TDMA (Time Division Multi-Ac)
cess) system, etc., instead of the duplexer 25,
Switches may be used.

[0008]

FIG. 10A and FIG. 10B
It is a schematic diagram of a state where these mobile phones 10h and 10p are used. The antennas 12h and 12p suffer from gain deterioration due to the influence of the user's head K and hand H.

As described above, the conventional portable telephone 10h,
8A and 8B, the whip antenna 12h and the flat antenna 12p
It is attached near the back of the. Therefore, FIG.
As shown in A and 10B, when the mobile phones 10h and 10p are put on the ears to talk with the other party, the antennas 12h and 12p are separated from the head K of the user,
The effect on antenna gain is reduced.

In this case, the reduction of the antenna gain is, for example, about 6 dB as compared with the free space and falls within the range of the system margin, so that there is no practical problem.

By the way, when performing data communication with the other party using the conventional portable telephones 10h and 10p as described above, or at the time of "standby", FIG.
As shown in FIG. 2, for example, it is often connected to a portable personal computer (so-called notebook personal computer) PCn by a connection cable CC and placed horizontally on a desk DSK.

However, in the conventional portable telephones 10h and 10p as described above, the whip antenna 12h and the planar antenna 12p are mounted near the back of the housing 11, respectively. If you place it horizontally, it will be very close to the desk DSK.

When the desk DSK is made of metal or a conductive material equivalent thereto, each antenna is significantly affected, and as shown by short broken line arrows in FIG. 11 and FIG. The gain is remarkably reduced, for example, about 15 to 20 dB as compared with the free space.

Therefore, the conventional portable telephones 10h, 10p
In such a case, when the data communication is performed while being placed horizontally on the conductive desk DSK, there is a possibility that the wireless line may be disconnected.

[0015] Furthermore, there is a problem that the quality of wireless communication cannot be guaranteed when the use form is diversified as the transmission speed increases in the future.

In view of the above, an object of the present invention is to provide a portable wireless communication device capable of avoiding the influence of the surrounding environment and always ensuring stable wireless communication quality regardless of the type of use. There.

[0017]

According to a first aspect of the present invention, there is provided a portable wireless communication apparatus comprising: a transmission / reception circuit including a transmission circuit unit and a reception circuit unit in a substantially rectangular parallelepiped casing; A plurality of planar antennas having substantially unidirectionality, a power combining circuit, and a portable wireless communication device housing a power distribution circuit, wherein each of the plurality of planar antennas is The transmission signal output from the transmission circuit, which is provided on a different internal surface, is supplied to each of the plurality of planar antennas via the power distribution circuit, and is received by the plurality of planar antennas. The received signal is supplied to the receiving circuit via the power combining circuit.

[0018] In the portable radio communication device according to the first aspect of the present invention, a plurality of planar antennas are provided on the opposing surfaces inside the housing.
The plurality of spatial radiation openings are formed in different directions, so that the influence of obstacles on the surrounding radio wave propagation is significantly reduced.

According to a second aspect of the present invention, there is provided a portable wireless communication apparatus, comprising: a transmission / reception circuit including a transmission circuit section and a reception circuit section inside a substantially rectangular parallelepiped casing; And a plurality of duplexers or switches provided for each of the plurality of planar antennas, a diversity combining circuit, and a power distribution circuit. Each of the antennas is disposed on a different surface inside the housing, and a transmission signal output from the transmission circuit is transmitted to the plurality of planar antennas via the power distribution circuit and the respective duplexers or switches. The received signals supplied to each of the antennas and received by the plurality of planar antennas are used for the respective duplexes. Or is supplied to the diversity combining circuit via a switch, is characterized in that to be supplied to the receiving circuit is diversity combining process.

In the portable radio communication device according to the second aspect of the present invention, a plurality of planar antennas are provided on the opposing surfaces inside the housing.
The plurality of spatial radiation openings are formed in different directions, so that the influence of obstacles on the surrounding radio wave propagation is significantly reduced. Further, by providing the diversity combining circuit, the combining processing gain is added, and the influence of multipath fading is significantly reduced.

According to a third aspect of the present invention, in the portable wireless communication device according to the first or second aspect, at least one of the plurality of planar antennas is provided in the housing. Is bent and disposed so as to straddle an adjacent surface inside.

In the portable wireless communication apparatus according to the third aspect of the present invention, a plurality of planar antennas are provided on the opposing surfaces inside the housing.
The plurality of spatial radiation openings formed in different directions are extended to the planes adjacent to the respective arrangement planes, thereby further increasing the resistance to the surrounding environment.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which a portable radio communication device according to the present invention is applied to a portable telephone will be described below with reference to FIGS.

[Structure of First Embodiment] FIG. 1 shows the mechanical structure of the first embodiment of the present invention, and FIG. 2 shows the electric structure. In FIGS. 1 and 2, portions corresponding to FIGS. 8 and 9 are denoted by the same reference numerals, and a part of the description is omitted.

Further, since the present invention has been made mainly with respect to the arrangement and connection of two antennas, the description of the configuration of the other portions will be omitted.

In FIG. 1, a housing 1 of a mobile phone 10B is shown.
A first planar antenna 13 having substantially unidirectionality is disposed at the upper end on the rear side (left side in the figure) of the antenna 1.
At the lower end on the front side (right side in the figure) of the housing 11, a second planar antenna 14 having substantially unidirectionality is provided.

That is, the mobile phone 10B according to this embodiment
Has a space radiation opening on each of two opposing surfaces of the housing 11. Then, a transmission / reception circuit system 20B described later is mounted inside the housing 11.

Although not shown, the front and rear ends of the housing are provided with openings for a receiver and a transmitter, and operation keys such as dial keys are provided in the middle. In addition, a liquid crystal display element is provided between the handset and the operation keys.

In FIG. 2, the transmission / reception circuit system 20B
Two matching circuits 23 and 24 and a power combining / distributing circuit 27 corresponding to the two planar antennas 13 and 14 are provided. The synthesizing / distributing circuit 27 includes two matching circuits 23, 2
4 and connected to the duplexer 25,
The transmission circuit 21 and the reception circuit 22 are connected to terminals TX and RX of the duplexer 25, respectively.

In a TDMA system or the like, a switch may be used instead of the duplexer 25.

[Call / Data Communication of First Embodiment]
Next, a call and data communication according to the first embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 2, in the transmission / reception circuit system 20B of the first embodiment, the transmission signal from the transmission circuit 21 is transmitted through the duplexer 25 to the power combining / distributing circuit 2B.
7 is supplied. In the synthesizing / distributing circuit 27, the power-divided transmission signal is supplied to the two planar antennas 13 and 14 through matching circuits 23 and 24, respectively.

Then, as shown in FIG.
The flat antennas 13 and 14 disposed on the back side and the front side of OB radiate toward the space.

Conversely, radio waves arriving from the space are received by two planar antennas 13 and 14 disposed on the back and front sides of the mobile phone 10B, respectively.
The received power induced in the transmission / reception circuit system 20B
Power combining / distributing circuit 2 through matching circuits 23 and 24
7 is supplied. In the combining / distributing circuit 27, the power-combined received signal is passed through the duplexer 25.
The signal is supplied to the receiving circuit 22.

Then, as shown in FIG.
When talking with the other party by putting 0B on the ear, the first and second planar antennas 13 and 14 are affected by the user's head K and hand H, and the antenna gain is degraded.

In a call state as shown in FIG. 3, as indicated by a short broken line arrow, in particular, the second planar antenna 14
And the radiation from the antenna 14 contributes little to the gain.

On the other hand, as shown by a long broken line arrow in FIG. 3, the influence on the first planar antenna is almost the same as that of the above-mentioned conventional example.

Accordingly, in a call state as shown in FIG.
The degradation of the overall antenna gain is, for example, approximately 8d
B and stay within the tolerance of the system margin,
No problem in practical use.

Further, as shown in FIG.
When B is combined with the portable personal computer PCn and placed horizontally on the conductive desk DSK to perform data communication, the flat antenna 13 on the back side is significantly affected and is indicated by a short broken line arrow. Thus, the antenna gain is significantly reduced.

On the other hand, the flat antenna 14 on the front side is hardly affected by the conductive desk DSK as shown by the long broken line arrow.

Therefore, as shown in FIG. 4, the deterioration of the antenna gain as a whole in the data communication state is, for example, as follows.
It is about 3 dB, and there is no problem in practical use.

As described above, in the portable telephone 10B of this embodiment, the rear side and the front side of the housing 11
By arranging the planar antennas 13 and 14, respectively, there are two spatial radiation openings on the rear side and the front side. Thus, the risk of a catastrophic effect is significantly reduced, the quality during a call can be ensured, and when used for data communication as described above, disconnection of a wireless line can be reliably avoided. it can.

Further, in the future, the transmission speed will increase,
Even when the usage forms are diversified, the quality of wireless communication can be ensured.

[Second Embodiment] Next, a second embodiment in which the portable radio communication device according to the present invention is applied to a portable telephone will be described with reference to FIGS.

FIG. 5 shows the mechanical configuration of the second embodiment of the present invention, and FIG. 6 shows the electrical configuration. 5 and 6, parts corresponding to those in FIGS. 1 and 2 are denoted by the same reference numerals, and a part of the description will be omitted.

Further, since the present invention has been mainly made with respect to the arrangement and connection of two antennas, the description of the configuration of the other portions will be omitted as in the above-described embodiment.

In FIG. 5, the housing 1 of the mobile phone 10D
1 so as to straddle the back side (left side in the figure) and the top side
A first planar antenna 13L, which is bent in an “L” shape and has substantially unidirectionality, is provided.
A second planar antenna 14L, which is bent in an “L” shape and has substantially unidirectionality, is provided so as to straddle the front side (right side in the figure) and the bottom side in the housing 11. .

That is, the mobile phone 10D of this embodiment
Here, two antennas on the rear and front sides corresponding to the antennas 13L and 14L disposed on the rear and front sides of the housing 11, respectively.
Three spatial radiation openings extend to the top and bottom surfaces adjacent to the respective major installation surface. Then, a transmission / reception circuit system 20 </ b> D described later is mounted inside the housing 11.

Although not shown, the front and rear ends of the housing are provided with openings for a receiver and a transmitter, and operation keys such as dial keys are provided in the middle. In addition, a liquid crystal display element is provided between the handset and the operation keys.

In FIG. 6, the transmission / reception circuit system 20D includes 2
The first and second duplexers 25 and 26 are connected to two matching circuits 23 and 24 corresponding to the two planar antennas 13L and 14L, respectively. The power distribution circuit 28 is connected to the transmission circuit 21 and the reception is performed. A diversity combining circuit 29 is connected to the circuit 22.

The power distribution circuit 28 is connected to the terminals TX of the duplexers 25 and 26, and the terminals RX of the duplexers 25 and 26 are connected to the diversity combining circuit 29.

In a TDMA system or the like, a switch may be used instead of the duplexers 25 and 26.

In the transmission / reception circuit system 20D according to the second embodiment as shown in FIG. 6, the transmission signal from the transmission circuit 21 is supplied to the power distribution circuit 28 and distributed.
One of the transmission signals from the distribution circuit 28 is supplied to one of the planar antennas 13L through the duplexer 25 and the matching circuit 23, and the other of the transmission signals from the distribution circuit 28 is supplied to the duplexer 26 and the matching circuit 24. Is supplied to the other planar antenna 14L.

Then, the two planar antennas 13L, 1
Mobile phone 10 as shown in FIG.
D is radiated toward the space from the back side and the top side, and the front side and the bottom side of the housing 11 of D.

Conversely, radio waves arriving from the space are received by the two planar antennas 13L and 14L disposed on the rear and front sides of the housing 11 of the mobile phone 10D.

The received signal induced by one antenna 13L is supplied to the diversity combining circuit 29 through the matching circuit 23 and the duplexer 25 of the transmission / reception circuit system 20D, and the received signal induced by the other antenna 14L is Is supplied to the diversity combining circuit 29 through the matching circuit 24 and the duplexer 26 of the transmission / reception circuit system 20D.

In the diversity combining circuit 29, for example, diversity combining processing such as selective combining, equal gain combining or maximum ratio combining is performed to add a combining processing gain, and to greatly reduce the influence of multipath fading. Is done. Then, the received signal subjected to the diversity combining process is supplied to the receiving circuit 22.

As described above, in this embodiment, the space radiation opening of the mobile phone 20D is extended from the main surface of the housing facing to the adjacent main surface to the adjacent surface.
In the normal use state in which the lower part of the mobile phone 20D is held by the hand H as shown in A, the influence of the user's head K and hand H on the planar antenna 13L at the upper end is indicated by a long polygonal arrow. As described above, the number of calls is relatively small as in the case of the call state of the embodiment shown in FIG.

Further, radio waves can be transmitted and received through the lower surface side radiation opening of the planar antenna 14L at the lower end,
The influence of the user's head K and hand H on the antenna 14L is represented by a long broken line arrow as shown below.
Compared to the call state of the first embodiment shown in FIG. 3, the number of calls is considerably reduced, and the possibility of line disconnection is reduced.

As shown in FIG. 7B, in an irregular use state in which the upper part of the mobile phone 20D is held by the hand H, the influence of the user's hand H on the planar antenna 13L at the upper end is a short broken line. As indicated by the arrows, although relatively large, it is possible to transmit and receive radio waves through the lower radiation opening of the planar antenna 14L at the lower end, and the user's head K and hand H with respect to this antenna 14L. Is significantly reduced as shown by the long broken arrow in the downward direction, and the possibility of line disconnection is reduced, as compared with the call state of the first embodiment shown in FIG.

On the other hand, as shown in FIG. 4, when the portable telephone 10D of this embodiment is combined with a portable personal computer and placed horizontally on a conductive desk to perform data communication, Flat antenna 13 on the back side
Although L is significantly affected and the antenna gain is significantly reduced, the front flat antenna 14L is hardly affected by the conductive desk.

Therefore, the deterioration of the antenna gain as a whole in the data communication state as described above can be reduced to a practically acceptable level.

As described above, in the portable telephone 10D of this embodiment, the rear side and the front side of the housing 11
By arranging the planar antennas 13L and 14L, respectively, the two spatial radiation openings corresponding to the antennas 13L and 14L are extended to the upper surface and the bottom surface adjacent to the respective main installation surfaces. Even if the resistance to the surrounding environment is further increased and there are obstacles of radio wave propagation around,
Compared with the conventional example, the risk of being fatally affected is significantly reduced, and the quality during a call can be ensured.

Further, in the case of using for data communication as described above, disconnection of a wireless line can be reliably avoided, and in the future, when the transmission speed is increased and the usage form is diversified, Also, the quality of wireless communication can be ensured.

Then, the mobile phone 10 of this embodiment
D, the diversity combining circuit 2 is connected to the transmitting / receiving circuit system 20D.
Since 9 is provided, the synthesis processing gain is added, and the influence of multipath fading is significantly reduced.

[Other Embodiments] In the above-described first and second embodiments, the configuration of the two planar antennas is different, and the configuration of the transmission / reception circuit system is also different. The present invention is not limited to the embodiments, and the planar antenna of each embodiment and the transmission / reception circuit system can be exchanged and combined.

Further, one of the two planar antennas may be formed to have a straight cross section, and the other may be formed to have an L-shaped cross section.

In the second embodiment, the case where the planar antenna extends over two surfaces, that is, the installation main surface and the adjacent surface, has been described. A planar antenna may be configured to straddle a surface.

In each of the above embodiments, two planar antennas are used. For example, the two planar antennas and the two planar antennas are substantially symmetric with respect to the center line of the housing.
Further, two planar antennas can be additionally used.

Further, in each of the above-described embodiments, the present invention is applied to a portable telephone, but the present invention can be similarly applied to other portable radio communication terminals.

[0071]

As described above, according to the first aspect of the present invention, a plurality of spatial radiation openings are formed in different directions, so that the influence of obstacles on radio wave propagation in the vicinity can be significantly reduced. it can.

According to the second aspect of the present invention, a plurality of spatial radiation apertures are formed in different directions, so that the influence of obstacles on the surrounding radio wave propagation can be significantly reduced, and the synthesis processing gain can be reduced. This can be added, and the effect of multipath fading can be significantly reduced.

According to the third aspect of the present invention, the resistance to the surrounding environment can be further increased.

[Brief description of the drawings]

FIG. 1 is a conceptual cross-sectional view showing a mechanical configuration of a first embodiment of a portable wireless communication device according to the present invention.

FIG. 2 is a block diagram showing an electrical configuration of the first embodiment of the present invention.

FIG. 3 is a conceptual diagram showing a call state according to the first embodiment of the present invention.

FIG. 4 is a conceptual diagram showing a data communication state according to the first embodiment of the present invention.

FIG. 5 is a conceptual cross-sectional view illustrating a mechanical configuration according to a second embodiment of the present invention.

FIG. 6 is a block diagram illustrating an electrical configuration according to a second embodiment of the present invention.

FIG. 7 is a conceptual diagram showing a call state according to the second embodiment of the present invention.

FIG. 8 is a conceptual cross-sectional view illustrating a mechanical configuration example of a conventional portable wireless communication device.

FIG. 9 is a block diagram showing an electrical configuration of a conventional example.

FIG. 10 is a conceptual diagram showing a call state in a conventional example.

FIG. 11 is a conceptual diagram showing a data communication state of a conventional example.

FIG. 12 is a conceptual diagram showing a data communication state of a conventional example.

[Explanation of symbols]

10B, 10D: mobile phone, 11: housing, 13, 13
L, 14, 14L ... Planar antenna, 20B, 20D ...
Transmission / reception circuit system, 21: transmission circuit, 22: reception circuit, 2
3, 24 ... matching circuit, 25, 26 ... duplexer, 27
... power combining / distributing circuit, 28 ... power distributing circuit, 29 ... diversity combining circuit, CC ... connecting cable, DSK ... desk (conductive), H ... hand, K ... head, PCn ... portable personal computer

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroki Ito 6-35, Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5K059 CC01 DD07 DD37 EE02 5K067 AA23 BB04 CC24 DD45 EE02 EE32 KK03

Claims (3)

[Claims] 1. A transmission / reception circuit including a transmission circuit unit and a reception circuit unit, a plurality of planar antennas having substantially unidirectionality, a power combining circuit, a power distribution circuit, Wherein each of the plurality of planar antennas is disposed on a different surface inside the housing, and a transmission signal output from the transmission circuit is the power distribution circuit. And the received signals received by the plurality of planar antennas are supplied to the receiving circuit via the power combining circuit. Portable wireless communication device. 2. A transmission / reception circuit including a transmission circuit section and a reception circuit section, a plurality of planar antennas having substantially unidirectionality, and a plurality of planar antennas, respectively, in a substantially rectangular parallelepiped casing. A portable wireless communication device that houses a plurality of duplexers or switches provided for the plurality, a diversity combining circuit, and a power distribution circuit, wherein each of the plurality of planar antennas has a different surface inside the housing. The transmission signal output from the transmission circuit is supplied to each of the plurality of planar antennas via the power distribution circuit and the respective duplexer or switch, and the plurality of planar antennas are provided. The received signal received by the antenna of the type is connected to the diversity combining circuit through the respective duplexer or switch. Is supplied to the portable radio communication device, characterized in that to be supplied to the receiving circuit is diversity combining process. 3. The portable wireless communication device according to claim 1, wherein at least one of the plurality of planar antennas is bent so as to straddle an adjacent surface inside the housing. A portable wireless communication device, wherein the portable wireless communication device is disposed.