JPH0993029A - Antenna device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make radio equipment thin by reducing the number of parts. SOLUTION: Inside a resin panel 2 fitted on the opening face of a resin casing 1 to form the casing of radio equipment, a ground panel conductor 4 is adhered and fixed, and outside the panel 2, a radiating conductor 5 is adhered and fixed. Besides, the ground panel conductor 4 and the radiating conductor 5 are grounded and connected through the resin panel by a through hole 9, and a feeder line 6 is connected to the radiating conductor 5. Thus, a planar inverse antenna can be formed on the resin panel and the number of parts can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device having a built-in plane in a specified low power radio used for equipment such as a cordless water heater.

[0002]

2. Description of the Related Art In recent years, there has been an increase in the number of wireless devices having a built-in planar antenna, such as mobile phones for mobile communication.
There is a plate-shaped inverted F antenna as a plane antenna built in the housing, which is also disclosed in Japanese Patent Laid-Open No. 104504/1983. However, the antenna surface of the plate-shaped inverted F antenna has to be fixed to a metal housing inside the housing with a resin spacer or the like when configuring a radio device. The structure in which the antenna surface is supported and sandwiched between the antenna surface and the metal case by a resin pedestal is common.

Next, the structure of a conventional plate-shaped inverted F antenna for mobile communication is shown in FIG. In FIG. 8, reference numeral 1 is a resin housing for housing a wireless communication unit, 2 is a resin panel attached to the opening surface of the resin housing 1 and forming a housing of a wireless device together with the resin housing 1, and 3 is a resin panel. A wireless communication unit 4 for wireless communication, 4 is a ground plane conductor for forming a ground plane, 5
Is a radiation conductor that is an antenna surface for radiating radio waves, 6
Is a power feed line for feeding power from the wireless communication unit to the radiation conductor 5, 7 is a ground metal material for grounding the radiation conductor 5 to the ground plane conductor 4, and 11 is a spacer interposed between the radiation conductor 5 and the ground plane conductor 4.
The radiating conductor 5 is fixed to the base plate conductor 4 built in the resin casing 1 with a spacer 11 and is fed with power between the radiating conductor 5 and the base plate conductor 4 by a feeder line 6.

[0004]

However, in the above conventional configuration, the radiation conductor 5 of the plate-shaped inverted F antenna is replaced by the ground plane conductor 4.
Since it is fixed to a metal case or the like with a spacer and a part of the radiating conductor 5 of the plate-shaped inverted F antenna is fed with a coaxial line to assemble a large number of small parts such as a spacer and a ground metal material, manufacturing workability is poor, A fixed component such as a spacer component must be used, and the radiation conductor 5 of the plate-shaped inverted F antenna and the resin panel 2 are formed separately, and a space is provided between the radiation conductor 5 and the resin panel 2. Since it has, there is a problem that it is difficult to make the wireless device thin. In the case of radio equipment used for equipment, the radiation conductor 5 is
However, there is also a problem that the characteristics of the antenna are changed due to the oxidation of.

The present invention solves the above-mentioned problems by facilitating fixing of the radiation conductor 5 of the plate-shaped inverted F antenna in a radio device and eliminating the need for spacer parts, thereby manufacturing a plate-shaped inverted F antenna with a built-in radio device. It is an object of the present invention to improve workability and to make it possible to construct a thin radio device having a plate-shaped inverted F antenna mounted thereon.

In addition to the above-mentioned object, it is another object of the present invention to prevent the characteristic deterioration due to the oxidation of the radiation conductor of the plate-shaped inverted F antenna of the radio equipment used for the equipment and the like due to the adhesion of water droplets.

[0007]

In order to achieve the above object, the antenna device of the present invention is one in which a radiation conductor of a plate-shaped inverted F antenna is fixed inside a resin panel.

Further, the radiation conductor of the plate-shaped inverted F antenna is formed inside the resin panel by means of plating, vapor deposition, coating or printing of a conductive material.

Further, the radiation conductor is fixedly integrated on the outside of the resin panel, the ground plane conductor is fixedly integrated on the inside of the resin panel, and the plate-shaped inverted F antenna is formed by sandwiching the resin panel so that the radiation conductor and the ground plane conductor face each other. It was formed.

Further, the radiation conductor outside the resin panel is formed by means of plating, vapor deposition, application or printing, and the ground plane conductor is adhered and fixed to the inside of the resin panel to form a plate shape using the radiation conductor and the ground plane conductor. An inverted F antenna is formed.

Further, the radiation conductor on the outside of the resin panel is formed by means of plating, vapor deposition, coating or printing, and the base plate conductor is adhered and fixed to the inside of the resin panel to form a plate shape using the base plate conductor and the radiation conductor. An inverted F antenna is formed, and a resin surface protection portion is provided on the surface of the radiation conductor.

[0012]

According to the present invention, the resin panel and the radiation conductor are fixedly integrated in the plate-shaped inverted F antenna incorporated in the wireless device according to the above-mentioned configuration, so that the manufacturing steps of the antenna device and the fixed parts such as the spacer parts are reduced.

Further, by forming the radiation conductor inside the resin panel by means of plating, vapor deposition, coating or printing, it is possible to reduce the number of steps and the manufacturing time in the manufacturing process of the plate-shaped inverted F antenna, and the spacer parts. Reduce the number of fixed parts such as.

Further, if the plate-shaped inverted F antenna is formed in the resin panel by integrally fixing the radiation conductor outside the resin panel and fixing the ground plane conductor inside the resin panel, the number of manufacturing steps of the antenna device can be reduced and manufactured. Reduce time and reduce fixed parts such as spacer parts.

Further, the base plate conductor is fixedly integrated inside the resin panel, and the radiation conductor is formed on the outside of the resin panel by means of plating, vapor deposition, coating or printing of a conductive material. To further reduce manufacturing time and reduce fixed parts such as spacer parts.

Further, the radiation conductor is formed on the outside of the resin panel by means of plating, vapor deposition, coating or printing of a conductive material, and a non-conductive surface protection portion is provided on the surface of the radiation conductor, so that the radio device can be installed outdoors. In this case, water drops do not adhere to the radiation conductor of the plate-shaped inverted F antenna.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. In FIG. 1, reference numeral 1 denotes a resin housing that is a case of a radio device that houses a device body that performs wireless communication, 2 denotes a resin panel that is attached to an opening surface of the resin housing 1 that receives the wireless device body, and 3 denotes a wireless device. A wireless communication unit which is a main body of the machine and includes a wireless circuit and a communication control circuit, 4 is a ground plane conductor forming a ground plane, 5 is a radiation conductor which is a plane antenna unit of a plate-shaped inverted F antenna, and 6 is a radiation conductor. A feed line 7 for feeding a signal is a ground metal material for connecting a part of the radiation conductor to the ground plane conductor 4.

This radio is a radio using a specified low power radio used for equipment such as a cordless hot water supply device, and its frequency band is 420 MHz band. As the antenna, a plate-shaped inverted F antenna built in the housing of the wireless device is used, and the radiation conductor 5 which is a planar antenna is fixed to the inside of the resin panel 2 of the wireless device by an adhesive material.

The wireless communication unit, which is the main body of the wireless device, is built in and fixed to the metal case, which is the ground plane conductor 4. The metal case, which is the ground plane conductor 4, is housed and fixed in the resin case 1, which is an outer case of the wireless device. Further, a metal ground metal material 7 is connected to a part of the edge of the radiation conductor 5 fixed to the resin panel 2, and one metal is placed at a position where impedance matching can be obtained when a plate-shaped inverted F antenna is constructed. The power supply line 6 made of a metal wire is connected by soldering. Further, the wireless communication unit 2 has an antenna terminal, and even in the metal case which is the ground plane conductor 4, a portion where the side of the ground metal material 7 connected to the radiation conductor 5 and the opposite side are connected electrically. It is processed to connect. Then, the resin panel 2 and the resin housing 1 are combined to form a housing of the wireless device, and the power supply line 6 and the ground metal material 7 of the antenna portion are respectively connected to the wireless communication portion 3
Is connected to the antenna terminal of the wireless circuit and the ground plane conductor 4 to form a plate-shaped inverted F antenna. Then, the resin panel 2 and the resin housing 1 are fixed with screws or the like to complete a wireless device.

FIG. 2 shows a plan view of the radio device. In this embodiment, the radiation conductor 5 has a rectangular shape and is mounted above the resin panel 2 of the wireless device. As shown in FIG. 2, the radiating conductor 5 may have a shape in which the notch 8 is formed on the antenna surface in order to increase the effective perimeter of the antenna without changing the overall size.

Further, in the present embodiment, the radiation conductor 5 of the plate-shaped inverted F antenna is fixed to the resin panel 2 with an adhesive, but the radiation conductor 5 is provided on the resin panel 2 as shown in FIG. The radiation conductor 5 may be fitted or embedded in the fitting position, and the feeder line 6 and the ground metal material 7 may be connected to the radiation conductor 5.

A third embodiment of the present invention will be described with reference to FIG. FIG. 4 shows the configuration of the resin panel of the wireless device. In FIG. 4, the radiation conductor 5 is formed on the inside of the resin panel 2 by means of plating, vapor deposition, application or printing. A ground metal material 7 is connected to a part of the edge of the radiation conductor 5, and a feed line 6 is connected to a position where impedance is matched when a plate-shaped inverted F antenna is formed. The resin panel 2 thus constructed is attached to the resin housing shown in FIG. 1 to form a plate-shaped inverted F antenna.

A fourth embodiment of the present invention will be described with reference to FIG. In FIG. 5, the same components as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. 9 in FIG.
Is a through hole which is provided in the resin panel 2 and electrically connects the ground plane conductor 4 and the radiation conductor 5. Resin panel 2
The radiation conductor 5 is adhesively fixed to the outside of the panel by an adhesive, and the ground plane conductor 4 is adhesively fixed to the inside of the resin panel 2. Through holes 9 are provided between the radiation conductor 5 and the ground plane conductor 4 with the resin panel 2 interposed therebetween. A metal material is vapor-deposited or plated in the through hole 9, and the radiation conductor 5 is the ground plane conductor 4.
Is electrically connected to Further, the radiation conductor 5 is connected to a power feed line 6 at a position where impedance matching can be achieved when a plate-shaped inverted F antenna is formed, and the other end of the power feed line 6 is connected to an antenna terminal of a wireless communication unit of a wireless device. It
With such a structure, the plate-shaped inverted F antenna is formed on the resin panel 2. A radio device is constructed using the resin panel 2 having the plate-shaped inverted F antenna formed thereon.

The through hole 9 may be formed by connecting the radiation conductor 5 and the ground plane conductor 4 by using a metal wire or another metal material. Further, in the present embodiment, the radiation conductor 5 and the ground plane conductor 4 are
Was adhered and fixed to the resin panel 2, but the second panel shown in FIG.
By embedding or fitting the radiation conductors 5 and the ground plane conductors 4 in the resin panel 2 as in the above embodiment, the resin panel 2 having the plate-shaped inverted F antenna can be formed thinner.

A fifth embodiment of the present invention will be described with reference to FIG. FIG. 6 shows an embodiment in which the radiation conductor 5 in the above embodiment is formed on the outside of the resin panel 2 by means of plating, vapor deposition, coating or printing of a conductive material. The radiation conductor 5 is formed on the outside of the resin panel 2 by means of plating, vapor deposition, application or printing, and the ground plane conductor 4 is adhered and fixed to the inside of the resin panel 2 with an adhesive. The through hole 9 electrically connects the radiation conductor 5 and the ground plane conductor 4 via the resin panel 2. Further, in the radiating conductor 5, the feeder line 6 is connected to a position where impedance matching can be achieved when a plate-shaped inverted F antenna is formed. The other end of the power supply line is connected to the antenna terminal of the wireless communication section of the wireless device. A wireless device is configured using the resin panel 2 having such a plate-shaped inverted F antenna. In this embodiment, the ground plane conductor 4 is adhered and fixed to the resin panel 2 with an adhesive, but it may be formed by embedding or fitting in the resin panel 2, plating with a conductive material, vapor deposition, coating or printing. I do not care.

A sixth embodiment of the present invention will be described with reference to FIG. In FIG. 7, the same components as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG. 7, reference numeral 10 denotes a resin-made surface protecting portion provided on the resin-made panel 2 by means of plating, vapor deposition, application or printing for the purpose of waterproofing and preventing oxidation. Similar to the above-mentioned embodiment, the base plate conductor 4 is adhered and fixed to the inside of the resin panel 2, and the radiation conductor 5 is applied to the outside of the resin panel 2 by means of plating, vapor deposition, coating or printing.
The radiation conductor 5 and the ground plane conductor 4 are electrically connected to each other through the through-hole 9 and grounded through the resin panel 2. Further, one end of the feed line 6 is connected to a position where impedance matching can be achieved when the plate-shaped inverted F antenna is formed in the radiation conductor 5.

The other end of the power supply line 6 is connected to the antenna terminal of the wireless communication section of the wireless device. The radiation conductor 5 formed by plating or vapor deposition is formed so as to cover the surface of the radiation conductor 5 with the surface protection portion 10 of the radiation conductor formed of a resin material in order to prevent adhesion and oxidation of water droplets. . With such a configuration, the resin panel 2 is provided with the plate-shaped inverted F antenna, and the wireless device is attached to the housing of the wireless device having the built-in wireless communication unit.

When the resin case 1 of the radio device in all the embodiments of the present invention is made of a metal case, it can be used as a ground plane conductor of a plate-shaped inverted F antenna. Alternatively, the housing of the wireless device can be formed using another non-metallic housing.

[0029]

As is apparent from the above description, the antenna device of the present invention has the following effects.

In the plate-shaped inverted F antenna with a built-in wireless device, the wireless resin panel and the radiation conductor are fixed and integrated to reduce the manufacturing process of the antenna device and the fixed parts such as the spacer parts, thereby improving the workability and the productivity. To improve.

Further, since there is no space between the radiation conductor and the resin panel, there is an effect that the wireless device can be designed thinner. Further, by arranging the radiation conductor to be embedded in or fitted into the resin panel, a thinner radio device can be obtained.

Further, the radiating conductor is formed inside the resin panel by means of plating, vapor deposition, coating or printing means, so that the radiating conductor can be formed without attaching the radiating conductor component in the manufacturing process of the antenna device. Since it is formed, the manufacturing time is shortened, the number of manufacturing steps is reduced, and the number of fixed parts such as spacer parts can be reduced, so that the manufacturing workability and the productivity are improved.

When the radiation inverted conductor is fixedly integrated on the outside of the resin panel and the ground plane conductor is fixedly integrated on the inside of the resin panel to form a plate-shaped inverted F antenna in the resin panel, the antenna device is completely integrated with the resin panel. They can be integrated and handled as a single component, and by simply attaching this component to the resin housing of the wireless device, connection of the plate-shaped inverted F antenna to the wireless communication unit and assembly of the wireless device can be performed at once.
In addition, the manufacturing time can be shortened accordingly, and the number of fixed parts such as spacer parts can be reduced. By embedding or fitting the radiation conductor and the ground plane conductor in a resin panel, a thinner resin panel having a plate-shaped inverted F antenna can be formed, so that the radio device can be made thinner.

Further, a plate-shaped inverted F antenna is constructed by fixing and integrating a ground plane conductor inside the resin panel and forming a radiation conductor outside the resin panel by means of plating, vapor deposition, coating or printing of a conductive material. Then, since the antenna device is completely integrated with the resin panel, connection with the wireless communication part of the radio device of the antenna device and assembly of the radio device housing can be performed at one time, which can reduce the manufacturing process and the manufacturing time. Since the antenna device and the resin panel are integrated, the number of fixed parts such as spacer parts can be reduced. Further, since the radiation conductor is formed by means of plating, vapor deposition, application or printing of a conductive material, it can be manufactured in a thin shape, so that the appearance is not spoiled even if the radiation conductor is arranged outside the radio device housing. With respect to the ground plane conductor as well, by using a means of plating, vapor deposition, coating or printing of a conductive material, a thin design of the wireless device can be achieved, and manufacturing workability and productivity are improved.

Further, a radiation conductor is formed on the outside of the resin panel by means of plating, vapor deposition, coating or printing of a conductive material, and a non-conductive surface protection portion is provided on the surface of the radiation conductor, so that the radio device is outdoors. When it is used in, the performance of the antenna is less likely to deteriorate because it is possible to prevent water droplets from adhering to the radiation conductor and oxidation of the radiation conductor due to the deposition of water droplets, and it is possible to withstand outdoor use. Can be used for a wireless device used in the above, and the workability and the productivity of the plate-shaped inverted F antenna are improved.

[Brief description of drawings]

FIG. 1 is a sectional view of an antenna device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a cutout portion provided in a radiation conductor in the same device.

FIG. 3 is a sectional view showing a state in which a radiation conductor of an antenna device according to a second embodiment of the present invention is embedded in a resin panel.

FIG. 4 is a cross-sectional view showing a state in which a conductive material is plated on a resin panel to form a radiation conductor in the antenna device according to the third embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a state in which a plate-shaped inverted F antenna is formed on a resin panel in the antenna device according to the fourth embodiment of the present invention.

FIG. 6 is a sectional view showing a state in which a radiation conductor of an antenna device according to a fifth embodiment of the present invention is formed by plating a conductive material.

FIG. 7 is a sectional view showing a state in which a resin surface protection portion is provided on a surface of a radiation conductor in an antenna device according to a sixth embodiment of the present invention.

FIG. 8 is a sectional view showing the configuration of a conventional antenna device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Resin case 2 Resin panel 3 Radio communication part 4 Ground plane conductor 5 Radiation conductor 10 Surface protection part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Terue Matsumura 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (6)

[Claims] 1. A housing having an opening for accommodating a wireless communication unit, a resin panel attached to the opening of the housing, and a radiation conductor forming a plate-shaped inverted F antenna inside the resin panel. Antenna device. 2. The antenna device according to claim 1, wherein a radiation conductor is embedded inside the resin panel. 3. The antenna device according to claim 1, wherein the radiation conductor is formed by means of plating, vapor deposition, coating or printing of a conductive material. 4. A housing having an opening for housing a wireless communication unit, a resin panel attached to the opening of the housing, a radiation conductor fixed to the outside of the resin panel, and an inside of the resin panel. An antenna device comprising a ground plane conductor fixed to, and forming a plate-shaped inverted F antenna using the radiation conductor and the ground plane conductor. 5. The antenna device according to claim 4, wherein the radiation conductor fixed to the outside of the resin panel is formed by means of plating, vapor deposition, coating or printing of a conductive material. 6. A non-conductive surface protection part for protecting the surface of the radiation conductor fixed to the outside of the resin panel.
Or the antenna device according to item 5.