WO2014097797A1 - Radio communication unit and air-conditioner - Google Patents

Abstract

A conventional radio communication unit has a problem of the deterioration of communication performance due to radio wave interference when an antenna is installed on a substrate and if the antenna is placed near a ground pattern arranged on the substrate. This radio communication unit (7) is equipped with: a power supply substrate (10) having ground patterns (12) (a substrate primarily used for functions other than for communication); and a radio communication module (20) that has an antenna section (22) and is laminated on the power supply substrate (10). The distance between the antenna section (22) and the ground patterns (12) is greater than a prescribed distance. In addition, the antenna section (22) and ground patterns (12) are positioned so as not to face with each other.

Description

Wireless communication unit and air conditioner

The present invention relates to a wireless communication unit including a board mainly used for functions other than communication, and a wireless communication module stacked on the board, and an air conditioner including the wireless communication unit.

In recent years, a technique has been studied in which a wireless communication unit is built in an electric device such as an air conditioner and each function of the electric device is remotely controlled from a communication terminal such as a mobile phone.

The wireless communication unit includes a substrate mainly used for functions other than communication, an antenna disposed on the substrate, and a wireless communication module that performs wireless communication via the antenna.

JP 2012-89910 A

However, in the above wireless communication unit, when the antenna is disposed on the substrate, if the antenna is in the vicinity of the ground pattern disposed on the substrate, there is a problem that radio wave interference occurs and communication performance is deteriorated. is there.

Therefore, an object of the present invention is to provide a wireless communication unit capable of improving communication performance by suppressing the occurrence of radio wave interference.

A wireless communication unit according to a first aspect of the present invention has a function other than communication as a main application, and includes a substrate having a ground pattern, an antenna unit, and a wireless communication module stacked on the substrate, and the antenna unit The distance from the ground pattern is larger than a predetermined distance.

In this wireless communication unit, since the distance between the antenna portion and the ground pattern is larger than a predetermined distance, the occurrence of radio wave interference by the ground pattern is suppressed, and the communication performance can be improved.

The wireless communication unit according to the second invention is characterized in that, in the wireless communication unit according to the first invention, the antenna portion and the ground pattern do not face each other.

In this wireless communication unit, since the antenna portion and the ground pattern do not face each other, the distance between the antenna portion and the ground pattern can be increased. As a result, the occurrence of radio wave interference due to the ground pattern is suppressed, and the communication performance can be improved.

The wireless communication unit according to a third aspect of the invention is characterized in that, in the wireless communication unit according to the first or second aspect of the invention, the antenna portion is disposed in the vicinity of one end of the substrate.

In this wireless communication unit, since the antenna part is arranged near one end of the board, the radio wave is reflected by the ground pattern or the board compared to the case where the antenna part is arranged at the center side of the board. The problem is less likely to occur. As a result, the occurrence of radio wave interference is suppressed and communication performance can be improved.

In a wireless communication unit according to a fourth aspect of the present invention, in the wireless communication unit according to the third aspect of the invention, the wireless communication module has a protruding portion that protrudes to the outside of the substrate, and the antenna portion is located at the protruding portion. It is characterized by being arranged.

In this wireless communication unit, since the antenna portion is arranged at the protruding portion of the wireless communication module, the distance between the antenna portion and the ground pattern can be increased, and the distance between the antenna portion and the substrate itself can be increased. Can do. In addition, the problem of radio wave interference due to the radio wave being reflected on the ground pattern or the substrate is less likely to occur. As a result, the occurrence of radio wave interference is suppressed and communication performance can be improved. Furthermore, since the antenna portion is arranged at the protruding portion of the wireless communication module, the distance between the antenna portion and the ground pattern is secured, so that the portion where the ground pattern is cut out on the substrate can be reduced. The area of the ground pattern on the substrate can be increased.

In a wireless communication unit according to a fifth aspect of the present invention, in the wireless communication unit according to the third or fourth aspect of the present invention, a ground pattern disposed at one end of the substrate is at least part of a portion corresponding to the antenna portion. It is characterized by being cut out.

In this wireless communication unit, since the ground pattern arranged at one end of the substrate is cut out at least at a part corresponding to the antenna part, the antenna part and the ground pattern are The distance can be increased. As a result, the occurrence of radio wave interference due to the ground pattern is suppressed, and the communication performance can be improved. Further, even when the wireless communication module cannot be protruded outside the substrate due to restrictions on the arrangement of the wireless communication unit, the distance between the antenna portion and the ground pattern can be ensured.

The wireless communication unit according to a sixth aspect of the invention is characterized in that, in the wireless communication unit according to any one of the first to fifth aspects, the substrate is a power supply substrate that supplies power to the wireless communication module.

In this wireless communication unit, since the substrate is a power supply substrate that supplies power to the wireless communication module, a wireless communication module having no power source can be used.

The air conditioner pertaining to the seventh invention is characterized by comprising the wireless communication unit pertaining to any one of the first to sixth inventions.

This air conditioner can provide an air conditioner equipped with a wireless communication unit that can suppress radio wave interference and improve communication performance.

As described in the above description, according to the present invention, the following effects can be obtained.

In the first invention, since the distance between the antenna portion and the ground pattern is larger than a predetermined distance, the occurrence of radio wave interference due to the ground pattern is suppressed, and the communication performance can be improved.

In the second invention, since the antenna portion and the ground pattern do not face each other, the distance between the antenna portion and the ground pattern can be increased. As a result, the occurrence of radio wave interference due to the ground pattern is suppressed, and the communication performance can be improved.

In the third aspect of the invention, since the antenna unit is disposed near one end of the substrate, radio wave interference caused by reflection of the radio wave on the ground pattern or the substrate, compared to the case where the antenna unit is disposed on the center side of the substrate. The problem is less likely to occur. As a result, the occurrence of radio wave interference is suppressed and communication performance can be improved.

In the fourth invention, since the antenna portion is arranged at the protruding portion of the wireless communication module, the distance between the antenna portion and the ground pattern can be increased, and the distance between the antenna portion and the substrate itself is also increased. Can do. In addition, the problem of radio wave interference due to the radio wave being reflected on the ground pattern or the substrate is less likely to occur. As a result, the occurrence of radio wave interference is suppressed and communication performance can be improved. Furthermore, since the antenna portion is arranged at the protruding portion of the wireless communication module, the distance between the antenna portion and the ground pattern is secured, so that the portion where the ground pattern is cut out on the substrate can be reduced. The area of the ground pattern on the substrate can be increased.

In the fifth invention, since the ground pattern arranged at one end of the substrate is cut out at least in a part corresponding to the antenna part, the antenna part and the ground pattern are cut out in the cut out part. The distance can be increased. As a result, the occurrence of radio wave interference due to the ground pattern is suppressed, and the communication performance can be improved. Further, even when the wireless communication module cannot be protruded outside the substrate due to restrictions on the arrangement of the wireless communication unit, the distance between the antenna portion and the ground pattern can be ensured.

In the sixth invention, since the substrate is a power supply substrate that supplies power to the wireless communication module, a wireless communication module having no power supply can be used.

In the seventh invention, it is possible to provide an air conditioner including a wireless communication unit that can suppress radio wave interference and improve communication performance.

1 is a system configuration diagram of a wireless communication system using a wireless communication unit according to an embodiment of the present invention. (A) is a front view of the radio | wireless communication unit shown in FIG. 1, (b) is II (b) -II (b) sectional drawing of (a). FIG. 3 is a rear view of the wireless communication module shown in FIG. 2. (A) is a front view of the power supply board shown in FIG. 2, (b) is a rear view. It is a graph which shows the communication performance (effect) of the radio | wireless communication module shown in FIG.

Hereinafter, the wireless communication unit 7 according to the embodiment of the present invention will be described with reference to the drawings.

[Configuration of Wireless Communication System 1]
First, the configuration of the wireless communication system 1 using the wireless communication unit 7 will be described with reference to FIG.

As shown in FIG. 1, a wireless communication system 1 includes a communication terminal 2, a network (Internet) 3, a modem 4, a wireless router 5, a provider server 6, a wireless communication unit 7, an electric device 8, and the like. It is configured. The communication terminal 2 is, for example, a mobile phone such as a smartphone or a mobile phone, or a portable information communication terminal such as a PDA or a notebook computer. The wireless communication unit 7 includes a wireless communication module 20 that performs wireless communication with the communication terminal 2, and is built in the electric device 8. The electric device 8 is an indoor unit of an air conditioner, for example.

This communication terminal 2 can remotely control the electric device 8. Specifically, the communication terminal 2 is connected to the network 3, and the operation information of the electric device 8 and the like input to the communication terminal 2 is transmitted. Then, the wireless communication module 20 receives the operation information and transmits it to the control unit of the electric device 8, and the control unit executes each function of the electric device 8 based on the operation information. As a result, by operating the communication terminal 2, it is possible to perform operations such as operation and stop of the air conditioner, selection of an operation mode, change of the air volume and temperature, and the like when going out.

[Configuration of wireless communication unit 7]
Next, the configuration of the wireless communication unit 7 built in the electric device 8 will be described with reference to FIGS. As shown in FIG. 2, the wireless communication unit 7 includes a power supply substrate 10 and a wireless communication module 20 stacked on the power supply substrate 10. In the following description, the left-right direction, the front-rear direction, and the up-down direction when the wireless communication unit 7 is viewed from the front are simply referred to as the left-right direction, the front-rear direction, and the up-down direction, respectively.

<Wireless communication module 20>
As shown in FIGS. 2 and 3, the wireless communication module 20 includes a rectangular substrate 21, an antenna unit 22, a control unit 23 including a CPU 23 a, a connection unit 24, and the like. Wireless communication with the communication terminal 2 or the like. The antenna unit 22, the control unit 23, and the connection unit 24 are disposed on the substrate 21. Moreover, the antenna part 22 and the control part 23, and the control part 23 and the connection part 24 are each electrically connected by printed wiring. The wireless communication module 20 does not have a power supply and operates by receiving power from the power supply board 10. The wireless communication module 20 uses a commercially available module that has been certified by the Radio Law. Therefore, in this wireless communication unit 7, it is possible to replace only the wireless communication module 20 with, for example, the latest one with high performance without changing the power supply board 10.

The wireless communication module 20 is stacked on the power supply substrate 10 by connecting (attaching) the connection portion 24 to the connection portion 13 (see FIG. 4A) provided on the power supply substrate 10. And electrically connected to the power supply substrate 10. As shown in FIG. 2, the antenna unit 22 and the control unit 23 are arranged on the same surface (back side) as the surface on which the connection unit 24 is arranged, on both surfaces of the substrate 21. In a state of being stacked on the substrate 10, the antenna unit 22 and the control unit 23 face the power supply substrate 10 side. Therefore, in FIG. 2A, the antenna unit 22, the control unit 23, and the connection unit 24 that cannot be seen from the front are indicated by chain lines. Further, the wireless communication module 20 and the power supply board 10 are screwed together by screws S so that the wireless communication module 20 is not easily detached from the power supply board 10.

Further, the wireless communication module 20 is arranged such that a part of the substrate 21 protrudes outside the front end portion 14F (one end portion) of the power supply substrate 10. Therefore, the wireless communication module 20 has a protruding portion 25 that protrudes outward from the front end portion 14F of the power supply substrate 10. The protruding length L1 (see FIG. 2B) of the protruding portion 25 is about 6 mm. The antenna portion 22 is disposed on the protruding portion 25. That is, the antenna portion 22 is disposed in the vicinity of the front end portion 14F (one end portion) of the power supply substrate 10.

The antenna unit 22 includes a patch antenna 26 that receives radio waves and a pattern antenna 27 that transmits the received radio waves to the control unit 23. As shown in FIG. 2A, the patch antenna 26 is disposed on the front side and the left side of the protruding portion 25 of the substrate 21. The thickness of the patch antenna 26 in the vertical direction is about 1 mm. The pattern antenna 27 is a thin film and is L-shaped when viewed from the front. As shown in FIG. 3, the pattern antenna 27 includes a first portion 27a extending in the left-right direction on the front side of the protruding portion 25 and a second portion 27b extending from one end of the first portion 27a toward the control unit 23. Have. Note that the other end of the first portion 27 a is connected to the patch antenna 26. In addition, the end of the second portion 27 b is connected to the control unit 23.

<Power supply board 10>
The power supply substrate 10 is a substrate that supplies power to the wireless communication module 20, and as shown in FIG. It has each electronic component etc. which are not illustrated.

The ground pattern 12 is, for example, a copper foil, and is disposed on the front surface 11f and the back surface 11b of the substrate body 11 as shown in FIG. As shown in FIGS. 4A and 4B, the ground pattern 12 is substantially aligned with the outer peripheral line of the power supply substrate 10 at the left end portion 14L, the right end portion 14R, and the rear end portion 14B of the power supply substrate 10. Are arranged along. On the other hand, in the front end portion 14F of the power supply substrate 10, the ground pattern 12 disposed in the front end portion 14F is cut out at a part of the portion corresponding to the antenna portion 22 (hereinafter also referred to as the corresponding portion 15). . That is, the corresponding portion 15 is a portion where the distance (for example, the distance L2) from the front end 14Fa (one end) of the power supply substrate 10 to the ground pattern 12 does not correspond to the antenna portion 22 (hereinafter also referred to as a non-corresponding portion 16). There is a portion shorter than the distance (for example, distance L3). In addition, said distance L2 is about 6 mm, and distance L3 is less than 1 mm. Moreover, although the ground pattern 12 shown in FIGS. 2 and 4 has a substantially rectangular shape, it actually has various shapes of notches and holes.

Here, the portion corresponding to the antenna portion 22 (corresponding portion 15) refers to a portion included in a range from the left end 22L to the right end 22R of the antenna portion 22 in the front-rear direction in the front end portion 14F (FIG. 4). The hatched part inside). On the other hand, the portion (non-corresponding portion 16) that does not correspond to the antenna portion 22 in the front end portion 14F refers to a portion other than the corresponding portion 15 in the front end portion 14F.

<Relationship Between Antenna Unit 22 and Ground Pattern 12>
In the wireless communication unit 7 configured as described above, the distance between the antenna unit 22 and the ground pattern 12 is larger than a predetermined value, and the antenna unit 22 and the ground pattern 12 are not opposed to each other as shown in FIG. It has become.

Here, the distance between the antenna unit 22 and the ground pattern 12 is larger than a predetermined distance between all the antenna units 22 including the patch antenna 26 and the pattern antenna 27 and the ground pattern 12 arranged on the front and back of the power supply substrate 10. This means that there is no part where the distance is less than or equal to the predetermined value. Note that “greater than a predetermined value” in the present application specifically means that the distance between the antenna portion 22 and the ground pattern 12 is greater than 5 mm, and preferably 6 mm or more.

[Example]
Next, the communication performance (effect) of the wireless communication module 20 used in the wireless communication unit 7 of the present embodiment will be described with reference to FIG.

The graph shown in FIG. 5 is a graph showing the communication performance of the wireless communication module 20 used for the wireless communication unit 7. The horizontal axis is the distance L between the antenna unit 22 of the wireless communication module 20 and the metal plate (assuming the ground pattern 12), and the vertical axis is the loss magnitude (dB) of the transmission output (setting 15 dB). That is, the vertical axis means that the transmission output (setting 15 dB) loss is small and the communication performance of the wireless communication module 20 is high as it goes upward.

As can be seen from FIG. 5, when the distance L between the antenna unit 22 of the wireless communication module 20 and the metal plate (assuming the ground pattern 12) exceeds 5 mm, the loss of the transmission output (setting 15 dB) is drastically reduced. It can be seen that the communication performance of the wireless communication module 20 is greatly improved. Further, it can be seen that when the distance L is 6 mm or more, the communication performance of the wireless communication module 20 is sufficiently high compared to the case where the distance L is 5 mm or less.

[Features of wireless communication unit 7 of this embodiment]
The wireless communication unit 7 of this embodiment has the following characteristics.

In this wireless communication unit 7, in the wireless communication unit 7 in which the wireless communication module 20 is stacked on the power supply substrate 10 having the ground pattern 12, the distance between the antenna unit 22 and the ground pattern 12 is larger than a predetermined value. The occurrence of radio wave interference is suppressed and communication performance can be improved.

Further, in this wireless communication unit 7, since the antenna part 22 and the ground pattern 12 do not face each other, the distance between the antenna part 22 and the ground pattern 12 can be increased. As a result, the occurrence of radio wave interference by the ground pattern 12 is suppressed, and the communication performance can be improved.

Further, in this wireless communication unit 7, the antenna portion 22 is disposed in the vicinity of the front end portion 14 </ b> F (one end portion) of the power supply substrate 10, so that the antenna portion 22 is disposed on the center side of the power supply substrate 10. The problem of radio wave interference due to reflection of radio waves on the ground pattern 12 and the power supply substrate 10 is unlikely to occur. As a result, the occurrence of radio wave interference is suppressed and communication performance can be improved.

In this wireless communication unit 7, the wireless communication module 20 has a protruding portion 25 protruding outward from the front end portion 14 </ b> F of the power supply substrate 10, and the antenna portion 22 is disposed on the protruding portion 25. The distance between the portion 22 and the ground pattern 12 can be increased, and the distance between the antenna portion 22 and the power supply substrate 10 itself can be increased. In addition, the problem of radio wave interference caused by reflection of radio waves on the ground pattern 12 and the power supply substrate 10 hardly occurs. As a result, the occurrence of radio wave interference by the ground pattern 12 and the power supply substrate 10 is suppressed, and the communication performance can be improved. Further, since the antenna unit 22 is disposed on the protruding portion 25 of the wireless communication module 20, the distance between the antenna unit 22 and the ground pattern 12 is secured, so that the ground pattern 12 is cut on the power supply substrate 10. The lacked portion can be reduced, and the area of the ground pattern 12 on the power supply substrate 10 can be increased.

In the wireless communication unit 7, the ground pattern 12 disposed at the front end portion 14 </ b> F (one end portion) of the power supply substrate 10 is notched at a part of the portion corresponding to the antenna portion 22 (corresponding portion 15). Therefore, the distance between the antenna portion 22 and the ground pattern 12 can be increased in the cutout portion. As a result, the occurrence of radio wave interference by the ground pattern 12 is suppressed, and the communication performance can be improved. Further, even when the wireless communication module 20 cannot be protruded outside the power supply substrate 10 due to restrictions on the arrangement of the wireless communication unit 7, the distance between the antenna unit 22 and the ground pattern 12 can be secured. it can.

In the wireless communication unit 7, since the substrate is the power supply substrate 10 that supplies power to the wireless communication module 20, the wireless communication module 20 that does not include a power supply component can be used.

Further, since the electric device 8 (air conditioner) includes the wireless communication unit 7 described above, the electric device 8 (air conditioner) that can suppress radio wave interference and improve communication performance is provided. it can.

Although the embodiments of the present invention have been described above, it should be considered that the specific configuration of the present invention is not limited to the above embodiments. The scope of the present invention is shown not only by the description of the above-described embodiment but also by the scope of claims, and further includes meanings equivalent to the scope of claims and all modifications within the scope.

[Modification]
In the wireless communication unit 7 of the present embodiment, the power supply board 10 is used. However, the power supply board 10 is not limited as long as it is a board mainly used for functions other than communication.

In the wireless communication unit 7 of the present embodiment, the wireless communication module 20 having no power source is used, but a wireless communication module having a power source may be used.

Further, in the wireless communication unit 7 of the present embodiment, the wireless communication module 20 has a protruding portion 25 that protrudes outside the power supply substrate 10, and the antenna portion 22 is disposed on the protruding portion 25 of the substrate 21. The antenna portion 22 is disposed above the power supply substrate 10 and in the vicinity of the front end portion 14F (one end portion) of the power supply substrate 10 without the protruding portion 25 protruding outside the power supply substrate 10. May be. Even in such a case, the occurrence of radio wave interference is suppressed by the ground pattern 12 and the power supply substrate 10, and the communication performance can be improved.

Further, in the wireless communication unit 7 of the present embodiment, the antenna unit 22 is disposed in the vicinity of the front end portion 14F (one end portion) of the power supply substrate 10, but the antenna unit 22 is disposed in the front end portion 14F of the power supply substrate 10. It may not be arranged in the vicinity.

In the wireless communication unit 7 of the present embodiment, the ground pattern 12 of the front end portion 14F is cut out at a part of the portion corresponding to the antenna portion 22 (corresponding portion 15). The ground pattern 12 may be cut out in the entire corresponding portion 15. Further, it is not essential that the ground pattern 12 of the front end portion 14F is notched in the corresponding portion 15.

In the wireless communication unit 7 of the present embodiment, the antenna unit 22 and the ground pattern 12 are not opposed to each other. However, if the distance between the antenna unit 22 and the ground pattern 12 is a predetermined distance or more, the antenna unit 22 and the ground pattern 12 may face each other.

In the wireless communication unit 7 of the present embodiment, the antenna unit 22 includes the patch antenna 26 and the pattern antenna 27, but the antenna unit 22 is not limited to this.

In the wireless communication unit 7 of the present embodiment, the case where the electric device 8 is an indoor unit of an air conditioner has been described, but the electric device 8 is not limited to this.

By using the present invention, it is possible to suppress the occurrence of radio wave interference and improve communication performance.

7 Wireless communication unit 8 Electrical equipment (air conditioner)
10 Power supply board (Board mainly used for functions other than communication)
12 Ground pattern 14F Front end (one end)
14Fa front end (one end)
15 Corresponding part (part corresponding to the antenna part)
20 Wireless communication module 22 Antenna portion 25 Protruding portion

Claims (7)

A main purpose is a function other than communication, a substrate having a ground pattern,
A wireless communication module having an antenna portion and stacked on the substrate;
A wireless communication unit, wherein a distance between the antenna unit and the ground pattern is larger than a predetermined distance. The wireless communication unit according to claim 1, wherein the antenna unit and the ground pattern do not face each other. The wireless communication unit according to claim 1 or 2, wherein the antenna unit is disposed in the vicinity of one end of the substrate. The wireless communication module has a protruding portion protruding outside the substrate,
The wireless communication unit according to claim 3, wherein the antenna unit is disposed in the protruding portion. The radio communication unit according to claim 3 or 4, wherein a ground pattern arranged at one end of the substrate is cut out at least at a part of a portion corresponding to the antenna unit. 6. The wireless communication unit according to claim 1, wherein the substrate is a power supply substrate that supplies power to the wireless communication module. An air conditioner comprising the wireless communication unit according to any one of claims 1 to 6.

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