JPH03171904A - portable radio antenna - Google Patents

Abstract

PURPOSE:To improve the deterioration of antenna directivity caused by a user's work posture, and also, to extend the radio service area by providing a clothes body formed by a flexible insulator being attachable and detachable to and from the human body, and a flexible string-like antenna element loaded on the clothes body. CONSTITUTION:To a net-like vest 6, a string-like whip antenna 1 is sewn and installed like a dress hanger, and a feeder drawn out of a rear neck part of the vest 6 is connected to a radio equipment by a connector 30. This vest type clothes 6 are easily attachable and detachable and sawn like a net with a fiber, therefore, no limit is given to a work operation, and also, there is such a convenient property as they can be contained in a pocket, etc., in a state of a small capacity by making them round after taking them off. In such a way, even if a user's posture is varied, the antenna directivity becomes roughly constant, the stability of a mobile ratio communication for a worker is secured, and also, the service area can be enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical field to which the invention pertains) The present invention relates to an antenna used in a mobile radio portable radio device using low power radio or weak radio waves in the VHF band or UHF band.

(Prior art and its problems) In the prior art, a single string-shaped antenna is used as an antenna for a portable radio device. However, when the current single string-shaped antenna is attached to the user of a portable radio device, when the user's working posture changes, for example, the antenna is placed on the back side of the human body toward the mobile radio base station antenna. (shadow), the disadvantage is that the directivity of the single string antenna described above deteriorates. In particular, in the case of weak radio waves, the wireless service area is reduced due to the deterioration of antenna directivity.
Although this has a large impact, the reality is that no effective means have yet been found, including methods for improving the mounting of antennas on the human body.

(Object of the Invention) An object of the present invention is to provide an antenna for a portable radio device that reduces the influence of the posture of the user of the portable radio device on the directivity and gain and expands the service area.

(Structure and operation of the invention) In order to solve the above-mentioned problem, a flexible string-like antenna is sewn onto a hat or clothing worn on the body of a user of a portable radio device, such as a cap or a vest. By maintaining the antenna's symmetrical structure with respect to the human body's height axis when worn, it improves the deterioration of antenna directivity caused by the user's working posture, and improves the antenna gain, thereby providing wireless services for portable radios. It is characterized by an expanded area. moreover,
Since each worker's clothing is unique, a flexible insulating material such as a cap or a vest can be used in the form of a rope to allow the antenna to be attached to or removed from between the clothes or over the hat, and the cap or vest with the antenna removed can be attached or removed. A major feature of this vest is that it has a structure that allows the vest to be easily stored in a pocket or the like.

Since such a string-like whip antenna sewn onto a cap or vest is worn on the human body like a crest, the symmetry of the antenna can be maintained around the human body's height axis.

That is, the antenna of the portable radio device of the present invention has the following configuration.

(1) A costume body formed of a flexible insulating material that can be attached to and detached from a human body, and when the costume body is worn on the human body, two elements from the feeder connection part are point symmetrical or symmetrical with respect to the height axis of the human body. An antenna for a portable radio device, comprising: a flexible string-like antenna element mounted on the costume body so as to be arranged plane-symmetrically with respect to a plane passing through the height axis of the human body.

(2) A sleeveless vest made of a flexible insulating material that can be attached and removed from the human body; and when the sleeveless vest is worn on the human body, two elements from the feeder connection portion at the back neck are symmetrical to the left and right torso. and a flexible string-like antenna element mounted on the sleeveless body jacket so as to be disposed in the sleeveless body.

(3) a cap formed of a flexible insulating material that is removable from a helmet; and when the cap is attached to the helmet, two elements reach the edge of the helmet from the feeder connection part at the top and reach the edge. and a flexible string-like antenna element mounted on the cap so as to be arranged point-symmetrically with respect to the top along the line.

(4) A costume body formed of a flexible insulating material that can be attached to and detached from a human body, and when the costume body is worn on the human body, a loop element from a feeder connection portion is point symmetrical with respect to the height axis of the human body or the human body and a flexible string-like antenna element mounted on the costume body so as to be arranged plane-symmetrically with respect to a plane passing through the height axis of the portable radio device.

(5) a cap formed of a flexible insulating material that is removable from the helmet; and a cap formed from a flexible insulating material that is detachable from the helmet; An antenna for a portable radio device, comprising a flexible string-like antenna element mounted on the cap in a loop shape.

The antenna directivity (antenna gain) when the antenna according to the present invention is worn on the human body is 1
Compared to a book string antenna, this antenna has improved by up to about 25 dB and at least about 10 dB, and the service area has been expanded.

In other words, when wearing the antenna of the present invention sewn onto a vest in the form of a vest, the antenna element pieces sewn at positions corresponding to both shoulders of the body correspond to the horizontal polarization plane of the die-ball antenna, and The partial pieces of the antenna element sewn at the positions on both sides correspond to the vertical polarization plane of the die ball antenna, and the two polarization planes mentioned above can be combined to obtain the so-called polarization diharsity effect. The drop in received radio waves that occurs when the radio moves is reduced compared to the conventional single string antenna.
Service area will be expanded.

The heather invention will be explained in detail below with reference to the drawings.

FIG. 1(A) is a perspective view illustrating a case where a string-like whip antenna is attached to a human body in the form of a crest. Figure l (
In A), the antenna element piece 1 of the string-like whip antenna is shown being attached to a human body 2 in a state where it is hung on a person's clothes. FIG. 1(B) is a plan view of FIG. 1(A).

FIG. 2(A) is a front view of the antenna 1 of the present invention when it is attached to a human body, and FIG. 2(B) is a front view of the conventional string-like antenna 11 when it is attached to a human body. Moreover, FIG. 2(C) is a plan view showing the directivity in the cases of (A) and (B). Further, FIG. 2(D) is a characteristic diagram showing the relationship between the antenna reception input level of the portable radio device and the distance from the fixed station (point 0). 13 shows the conventional characteristics, and 14 shows the characteristics of the antenna of the present invention.

In FIG. 2(C), 3 indicates the directivity of a single conventional string-like antenna 1l, and 4 indicates the directivity of the string-like whip antenna 1 of the present invention.

Figure 3 (A). (B) and (C) are front views showing the first embodiment of the present invention. Side view. It is a partial front view, in which a string-like whip antenna 1 is sewn onto a net-like vest 6 in the form of a clothing crest. 5 is a portable radio, the best 6
The feeder pulled out from the rear neck portion of the body is connected to the radio device 5 through a connector 30. The vest-type clothing 6 is easy to put on and take off, and because it is sewn in a net shape with fibers, it does not restrict work movements.After taking off the clothing, it can be rolled up into a small shape and stored in a small volume such as a pocket. It is convenient to store it in.

FIG. 4 is a plan view and a rear view showing a second embodiment of the present invention, in which a string-shaped whip antenna 1 is sewn onto a helmet cap 7 and is attached to a helmet 8. That is, the antenna element 1 of the string-like whip antenna is sewn to the net-like helmet cap 7 as shown in the figure, and is shown attached to the helmet 8 in the form of a cap. 5 is a portable radio (not shown) with a code (
It is connected to the top of the antenna 1 by a feeder) 40. As shown in the figure, the helmet cap 7 is sewn into a net shape using stretchable fibers, so that it can be easily attached to and removed from the helmet 8. Further, after use, it is convenient to be able to remove it from the helmet 8 and store it in a small volume, such as by rolling it into a small shape.

FIG. 5 is a side view and a plan view showing a third embodiment of the present invention in which a string-shaped whip antenna sewn onto a helmet cap is attached to a helmet.

In FIG. 5, a cap is attached to the helmet 8 by sewing the rising antenna element part 9 (for vertical polarization plane) of the string-like whip antenna and the element part 10 (for horizontal polarization plane) along the edge. It shows how it is mounted. The antenna element parts 9 and 10 are sewn to a net-like helmet cap 7 made of fiber as shown. Reference numeral 5 denotes a portable radio device, which is connected to the antenna element section 10 through a cord (feeder) 40. As shown in the figure, the helmet cap 7 is sewn into a net shape using stretchable fibers, so it is easy to attach and remove from the helmet 8, and after use, it can be removed from the helmet 8 and rolled into a small shape. It is convenient because it can be stored in a small volume.

FIG. 6 is a rear view and a plan view showing a fourth embodiment of the present invention, in which a string-like antenna I6 sewn to a net-like helmet cap 7 is formed into a loop shape when worn; It goes around the edge of the helmet and is connected to a cord (feeder) 40 from an arbitrary point.

(Function) In Figure 1, the wave front (arrow direction) indicates the direction of radio wave arrival.
Let be l5. The results of measuring the antenna directivity (horizontal plane) of the antenna 1 according to the present invention when the antenna 1 attached to the human body 2 is rotated in the direction of angle θ (arrow) around the X-axis are shown in FIG. 2(C). This is characteristic 4. In addition, the antenna directivity (horizontal plane) of the conventional string antenna 11 when the conventional string antenna 11 shown in FIG. 2 is rotated in the direction of the angle θ (arrow) around the
The result of measuring is characteristic 3. As shown in characteristic 3.4, the antenna directivity (horizontal plane) 4 of the present invention is superior to the conventional antenna directivity (horizontal plane) 3 (up to 25
dB). That is, when worn on the human body, for example, when facing the mobile radio base fixed station antenna,
Since the conventional drawback of deterioration of antenna directivity is improved, the level difference d between antenna directivity 3 and 4 is
(=approximately 25 dB).

In FIG. 2(D), if the reception input distance characteristic of the conventional string antenna 1l of the portable radio device 5 is 13, the reception input distance characteristic of the antenna I of the present invention is 14, which is the reference value of the communicable reception level. The service area determined by L is improved by the reception input level difference d, the distance indicating the radius of the service area becomes 12 from l1, and the distance Mi
The service area will be expanded by s. Antenna directivity of portable radio device 5 attached to human body (horizontal plane)
However, it can be seen that the fact that it remains almost constant even if the user's working posture changes has a significant effect on expanding the practical service area.

The antenna directivity (horizontal plane) of the embodiments shown in FIGS. 3, 4, 5, and 6 is as shown in FIG. 2 (C).
A value almost similar to characteristic 4 was actually measured.

(Effects of the Invention) (1) When this antenna is worn on the human body, the antenna directivity remains almost constant even if the user's posture changes, so it is effective in ensuring stable mobile radio communications for workers. Effective in expanding service area.

(2) This antenna is convenient because it can be easily attached to and removed from the human body or a melmet (ordinary hat), and it is also easy to store.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the case where the crest-shaped antenna of the present invention is mounted on a human body, Fig. 2 is an explanatory diagram of antenna directivity (horizontal plane) and antenna reception human power distance characteristic diagram, Figs. 3 and 4. 5 and 6 are structural diagrams showing an embodiment of the present invention. 1, 9, 10. IL 16... Antenna element, 2... Human body, 3.4... Antenna direction (horizontal), 5... Portable radio, 6... Vest type clothing, 7.
... Helmet cap, 8... Helmet, 13.
14... Antenna reception human power distance characteristics, 15...
Wavefront in direction of arrival of radio waves, 30... Connector, 40...
code.

Claims (5)

[Claims] (1) A costume body formed of a flexible insulating material that can be attached to and detached from a human body, and when the costume body is worn on the human body, two elements from the feeder connection part are point symmetrical or symmetrical with respect to the height axis of the human body. An antenna for a portable radio device, comprising: a flexible string-like antenna element mounted on the costume body so as to be arranged plane-symmetrically with respect to a plane passing through the height axis of the human body. (2) A sleeveless vest made of a flexible insulating material that can be attached and removed from the human body; and when the sleeveless vest is worn on the human body, two elements from the feeder connection portion at the back neck are symmetrical to the left and right torso. and a flexible string-like antenna element mounted on the sleeveless body jacket so as to be disposed in the sleeveless body. (3) a cap formed of a flexible insulating material that is removable from a helmet; and when the cap is attached to the helmet, two elements reach the edge of the helmet from the feeder connection part at the top and reach the edge. and a flexible string-like antenna element mounted on the cap so as to be arranged point-symmetrically with respect to the top along the line. (4) A costume body formed of a flexible insulating material that can be attached to and detached from a human body, and when the costume body is worn on the human body, a loop element from a feeder connection portion is point symmetrical with respect to the height axis of the human body or the human body and a flexible string-like antenna element mounted on the costume body so as to be arranged plane-symmetrically with respect to a plane passing through the height axis of the portable radio device. (5) a cap formed of a flexible insulating material that is removable from the helmet; and a cap formed from a flexible insulating material that is detachable from the helmet; An antenna for a portable radio device, comprising a flexible string-like antenna element mounted on the cap in a loop shape.