JP3103091U - Best antenna - Google Patents

Abstract

PROBLEM TO BE SOLVED: To be easily worn on a body when carried, to have no uncomfortable feeling, to be inconspicuous, and to have good transmission / reception performance, and to be mounted on a vehicle, to have an antenna in appearance. Provided is a best antenna which can be easily attached without showing the antenna and has good transmission / reception performance.
SOLUTION: An antenna element portion 1, a matching portion 2, and a ground wire portion 3 are adhered inside a back portion of a vest 5. These materials are made of conductive cloth and can be freely bent. The antenna element 1 and the ground wire 3 are tape-shaped, and the antenna element 1 is vertically bonded and the ground wire 3 is horizontally bonded. The main body of the wireless device is put in a pocket or the like, and power is supplied between the matching unit 2 and the ground wire unit 3 by the coaxial cable 4.
[Selection diagram] Fig. 1

Description

The present invention relates to an antenna for a wireless device in which a conductive cloth is attached to cloth such as clothing.

When a portable wireless device is used, it is a general style that a metal antenna such as a whip antenna protrudes from the wireless device or is attached to a part of a car to make a call.
An antenna that supports a thin metal antenna along the body surface has been proposed as a device that communicates by attaching the antenna to a part of the body, but this has a metal antenna pattern formed on a flexible substrate or film etc. It is inflexible and inconvenient for radio users.
In addition, they bend to some extent following the movement of the body, but depending on the posture of the user of the wireless device, they may be damaged or sometimes harmful to the body.

  As an antenna in which an antenna is attached to clothes, there is an antenna in which a data carrier having an antenna printed and wired on a flexible printed circuit board is attached to a sheet, a white coat, or the like (Patent Document 1). The data carrier is attached to the lower part of the neck of the white coat so that sheets and white coats can be automatically identified. However, this functions as a tag, and the data carrier itself is small and is not used as an antenna of a portable wireless device.

Further, in the case of an antenna of a vehicle-mounted wireless device, an antenna shape that protrudes upward from the exterior of a car has a structure that is not preferable in design because it easily contacts a protruding portion that becomes an obstacle on a road. The present applicant has proposed an antenna that does not protrude from a car (Patent Document 2). Since the antenna element is built in the door mirror and cannot be mounted depending on the type of vehicle, an antenna structure that can be easily mounted on all vehicles regardless of the type of vehicle is required.
JP-A-11-180545 Utility Model Registration No. 3095114

In view of the above background, it is desired to realize an antenna that is safe and unobtrusive even when attached to a body and a vehicle, and that has good transmission and reception performance.
Therefore, the present inventor examined whether or not a material different from the material and shape of the conventional antenna with good transmission / reception performance and that could not be recognized as an antenna could be made.
The purpose of the present invention is to meet the above-mentioned demands. The purpose of the present invention is to be able to be easily attached to the body when carrying, to have no uncomfortable feeling, to be inconspicuous, and to have good transmission / reception performance, and to mount the vehicle. In the case of a type, it is an object to provide a best antenna that can be easily attached without showing the presence of the antenna in appearance and has good transmission / reception performance.

In order to achieve the above object, a first aspect of the present invention is a λ / 4 ground antenna for a portable wireless device, comprising: a garment; an antenna element portion of a conductive cloth provided in a vertical direction on an inner surface of the garment; A conductive cloth matching portion connected to an end of the antenna element portion and provided on the inner surface of the garment, and a ground wire portion of the conductive cloth provided on the inner surface of the garment in a horizontal direction; The antenna is formed on the inner surface of the garment by wearing the garment. That is, the present invention is a modification of the λ / 4 grounded antenna, which is composed of an antenna element portion, a matching portion, and a ground wire portion, each of which uses a conductive cloth, and which is attached to the back portion of clothes serving as a base. use.
According to a second aspect of the present invention, in the first aspect, the antenna element portion and the ground wire portion are formed in a tape shape, and the matching portion is formed in a crank shape, and the antenna shape is an inverted T-shape. It is characterized by doing.
According to a third aspect of the present invention, metallic hook males for clothing are soldered to the ends of the matching portion and the ground wire portion, respectively, to the coaxial cable and the inner conductor end of the coaxial cable. A metal hook female attached to and detached from the hook male of the matching portion, a connector having a metal hook female attached to and detached from the hook male of the ground wire at the outer conductor end of the coaxial cable are provided, and the coaxial cable is made detachable. Features. That is, power is supplied by connecting the inner conductor of the coaxial cable to the matching section and the outer conductor to the ground wire section.
According to a fourth aspect of the present invention, the antenna element, the matching portion, and the ground wire portion of the conductive cloth are bonded to the sunshade with the suction cup of the mesh cloth by iron printing.
In the above-mentioned garment, the garment is printed and adhered to felt fabric sewn to the back of the garment. For vehicles, it is attached to the mesh fabric sunshade and attached to the rear window with a suction cup.

According to the present invention, the length of the antenna element can be shortened by increasing the meander line of the matching portion, and a miniaturized antenna can be manufactured. Further, the coaxial cable can be easily attached and detached, and the folding of the clothes does not become bulky and does not hinder the folding. In addition, the usability is good, and communication can be performed while wearing clothes without discomfort.
Since it is attached to the sunshade during vehicle installation, it does not jump out of the vehicle and does not stand out.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a view for explaining an embodiment of a best antenna according to the present invention, and FIG. 2 is an enlarged view of an antenna element portion, a matching portion, and a ground wire portion.
An antenna element portion 1 made of a conductive cloth is provided in the center vertical direction on the back inside of the vest 5, and a matching portion 2 made of a conductive cloth is continuously provided below the antenna element portion 1.
In addition, a ground wire portion 3 that is grounded in the horizontal direction is similarly provided at the lowermost lower end of the back of the vest 5.
The antenna element portion 1 is tapered, and the matching portion 2 is meandering (meander line) in a crank shape to facilitate matching. The ground wire portion 3 has a tape shape like the antenna element portion 1 and is configured to have an inverted T-shape.

The inside of the back of the vest 5 is sewn with felt fabric, on which the antenna element 1, matching section 2 and ground wire 3 are bonded by iron printing.
One end of the outer conductor of the coaxial cable 4 for feeding power is connected to the lower end of the matching section 2 and one end of the inner conductor is connected to the center of the ground wire section 3 by soldering. By shortening the length of the antenna element portion 1 and increasing the number of cranks of the matching portion 2, matching can be achieved, and the antenna can be further reduced in size.
A portable wireless device main body (not shown) is placed in a pocket of a vest 5 for communication.

FIG. 3 is a diagram illustrating an embodiment of a connector for connecting an antenna and a coaxial cable, and FIG. 4 is a diagram illustrating a state where the connector for connection is removed.
Instead of directly connecting the antenna and the coaxial cable by soldering, the coaxial cable is made detachable using the connector 6. Hook males 7a and 7b are fixed to the lower end of the matching portion 2 and the upper end of the central portion of the ground wire portion 3 by soldering, respectively. On the other hand, a hook female 6a fitted to the hook male 7a and a hook female 6b fitted to the hook male 7b are attached to the connection connector 6 at the end of the coaxial cable 4. The hooks are made of metal for clothing and are electrically connected. Since the vest 5 and the coaxial cable can be easily removed, the vest 5 can be easily stored and the vest 5 can be easily washed.

FIG. 5 is a diagram showing an embodiment of a vest antenna using a blouson as clothing.
This is an example where it is attached to the inside of the back of the blouson 8 like the vest.
FIG. 6 is a view showing a state in which a vest to which the best antenna according to the present invention is attached and a blouson are worn.
As shown in FIGS. 6 (a) and 6 (b), the antenna cannot be seen from the outside, and is not different from a state where a normal vest or blouson is worn. Even if the shape of the vest or blouson is deformed according to the posture of the body by curling the back, bending the waist forward, and further twisting the waist, the antenna attachment part will be naturally like normal clothes. There is no discomfort because it bends. In addition, since the weight of the antenna including the connector is light, there is no sense that the antenna is attached.

FIG. 7 is a diagram showing another embodiment of the best antenna according to the present invention, which is an example applied to a sunshade.
In this figure, the interior 17 of the vehicle is viewed in the direction of the rear seat 19, and a sunshade 20 is attached to a rear window 18 by suction cups 21a and 21b. The antennas bonded on the sunshade 20 are two types of antennas having different carrier frequencies. The first antenna is composed of the antenna element part 22, the matching part 23 and the ground wire part 24, and the second antenna is composed of the antenna element part 25, the matching part 26 and the ground wire part 24, respectively. 27 is shared. The inner conductor and the outer conductor of the coaxial cable 27 are connected by soldering between the center of the ground wire portion 24 and the connection ends of the matching portions 23 and 26.
The antenna element parts 22, 25, the matching parts 23, 26, and the ground wire part 24 are made of a conductive cloth as in FIG. 1, and are bonded to a sunshade made of mesh cloth by iron printing. When the first antenna and the second antenna are selectively used, the wireless telephone connected to the coaxial cable is changed.

FIG. 8 is a graph showing the relationship between the standing wave ratio and the frequency of the best antenna according to the present invention, and FIG. 9 is a graph showing the relationship between the reception input electric field and the distance of the best antenna according to the present invention.
In FIG. 8, this data is a value in which the antenna wearer stands upright, and the standing wave ratio at a predetermined frequency is good. In FIG. 9, it can be seen that the reception surface of the back surface is at a predetermined distance, for example, 1 km, and the reception input electric field is at a level that allows communication. In addition, an electric field of の of the chest surface is obtained as compared with that of the back surface. From the above, it can be seen that the talkable distance has the same performance as the whip antenna.

Next, the results of comparing the antenna according to the present invention with the vertically polarized directional characteristics in the horizontal plane and the average gain in the horizontal plane of antennas having other structures will be described.
FIG. 10 is a diagram showing a configuration of a measurement system for comparing the performances of antennas, and a helical antenna is used as a comparison target. A subject wearing the antenna to be evaluated (best antenna and helical antenna according to the present invention) and a portable wireless telephone in an anechoic chamber transmits radio waves using the wireless device, and is 3 meters from the subject 15. The signal is received at a remote location using the biconical antenna 13, and the vertical polarization directional characteristic in the horizontal plane and the average gain in the horizontal plane are measured.
The subject 15 was erected on the turntable 10 so that the antenna position was at the center of the turntable 10, the turntable 10 was rotated 360 degrees, and the reception input level was measured by the spectrum analyzer 14. In order to calculate the absolute gain of the antenna to be measured for evaluation, a standard dipole antenna was installed at the center of the turntable, and the reception input level when a radio was connected to the antenna for transmission was measured by the spectrum analyzer 14.

FIG. 11 is a comparison diagram of the vertical polarization horizontal plane directivity characteristics and the horizontal plane average gain of each antenna measured by the measurement system shown in FIG.
In the best antenna state 1-1, the radio is stored in the left side pocket of the vest, and a high-frequency cable of about 1 meter is connected to connect to the radio from the antenna feeding point of the best antenna. In order to minimize the routing of the high-frequency cable to the antenna feeding point, the excess high-frequency cable is folded and stored in the left side pocket. In the best antenna state 1-2, the radio is stored in the left breast pocket of the vest, and the high-frequency cable is the same as above. Helical antenna (attached to UW-201) state 1-1 is a state in which a wireless device equipped with a helical antenna is housed in the left breast pocket of the cutter shirt worn by the subject. The helical antenna state 1-2 is a state in which a wireless device connected to a helical antenna using a helical antenna skin case is mounted on the left waist of the subject.

In FIG. 11A, the 0-degree direction indicates the front direction of the subject. The absolute gain was obtained by subtracting the measurement result of the reception input level with the standard dipole antenna from the measurement result of the reception input level with the antenna to be evaluated, and adding the absolute gain of the standard dipole antenna to the value.
It can be seen that the best antenna states 1-1 and 1-2 are both made in a stable orientation with a small gain difference in all directions. The best antenna state 1-1 is about 3d higher than the best antenna state 1-2. In addition, it can be seen that the best antenna generally has a smaller gain difference than the helical antenna, and also has an average gain.

  An antenna for a wireless device used by attaching an antenna of a conductive cloth to a cloth such as clothes and wearing the clothes.

FIG. 4 is a diagram illustrating an embodiment of a best antenna according to the present invention. It is an enlarged view of an antenna element part, a matching part, and a ground wire part. It is a figure showing an embodiment of a connector for connection of an antenna and a coaxial cable. It is a figure showing the connection structure of the connector for connection. It is a figure showing an embodiment of a vest antenna using a blouson as clothes. FIG. 3 is a view showing a state in which a vest and a blouson to which a vest antenna according to the present invention is attached are worn. FIG. 4 is a diagram showing another embodiment of the best antenna according to the present invention, which is an example applied to a sunshade. 4 is a graph showing a relationship between a standing wave ratio and a frequency of a best antenna according to the present invention. 4 is a graph illustrating a relationship between a reception input electric field and a distance of a best antenna according to the present invention. FIG. 3 is a diagram illustrating a configuration of a measurement system for comparing the performance of the best antenna according to the present invention. FIG. 11 is a comparison diagram of the vertical polarization horizontal plane directivity characteristics and the horizontal plane average gain of each antenna measured by the measurement system according to FIG. 9.

Explanation of reference numerals

1,22,25 Antenna element part 2,23,26 Matching part
3 Ground line
4 Coaxial cable
5 Best (clothing)
6 Connector 6a, 6b Hook Female 7a, 7b Hook Male 8 Blouson 10 Turntable 11 Best Antenna 12 Helical Antenna 13 Biconical Antenna 14 Spectrum Analyzer 15 Subject 17 In Car 18 Rear Window 19 Rear Seat 20 Side Shade 21a, 21b Sucker 27 coaxial cable

Claims (4)

In a λ / 4 ground antenna for a portable radio,
Clothes and
An antenna element portion of a conductive cloth provided in a vertical direction on the inner surface of the clothes,
A matching portion of a conductive cloth connected to an end of the antenna element portion and provided on an inner surface of the garment;
And a ground wire portion of a conductive cloth provided horizontally on the inner surface of the clothes,
A vest antenna, wherein an antenna is formed on the inner surface of clothing by wearing the clothing. The antenna element portion and the ground wire portion are in a tape shape,
The matching portions are each formed in a crank shape,
2. The best antenna according to claim 1, wherein the antenna is configured to have an inverted T shape. Solder a metallic hook male for clothing to the matching part and the end of the ground wire part, respectively.
The coaxial cable has a metal hook female attached to and detached from the hook male of the matching portion at the inner conductor end of the coaxial cable, and a metal hook female attached to and detached from the hook male of the ground wire at the outer conductor end of the coaxial cable. Provide a connector,
3. The best antenna according to claim 1, wherein the coaxial cable is detachable.   Best antenna characterized in that the antenna element, matching part and ground wire part of conductive cloth are bonded by iron printing to the sunshade with suction cup of mesh cloth.

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