JPH0256123A - Portable radio equipment - Google Patents

Abstract

PURPOSE:To realize an antenna with less damage without being affected by a radio equipment enclosure by incorporating an antenna conductor to part of a shoulder belt. CONSTITUTION:An antenna 16 made of a conductive member is mounted to part or all a portable shoulder belt 13 in a portable radio equipment 11 having the said belt 13. Then the antenna is connected to an antenna terminal 18 of the radio equipment 11. Thus, since an antenna 16 is placed at the upper part from the enclosure of the radio equipment 11, the antenna 16 is free from the effect of the enclosure. Thus, the antenna with high sensitivity is realized. Moreover, the antenna with high sensitivity to a vertically polarized wave is obtained by using a long conductive member. Furthermore, the damage to the antenna is prevented by using a flexible conductive member.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a portable radio device such as a transmitter/receiver, a transmitter, or a receiver, which is hung from a belt or string and is carried around for two calls. .

[Problem to be solved by the invention]

By the way, the above-mentioned conventional portable wireless device had the following drawbacks.

In the case of sleeve antennas: ■Since the rod-shaped antenna is attached to the side of the housing, shielding by the housing causes radiation bang, distortion, and a decrease in gain.

■The antenna protrudes from the radio, making it inconvenient to handle and easily damaged by impact. Furthermore, in a base station vertically polarized transmission system, such as a car telephone system, the gain is high if the antenna is always vertical. Therefore, in order to always keep the antenna vertical even when the usage pattern changes, the antenna mounting part is made movable, and the structure is easily broken.

When an antenna element such as an inverted F-shaped antenna is built into the housing: ■The volume of the antenna cannot be increased because it compresses the internal radio equipment, making it impossible to obtain high gain.

In order to keep the volume of the antenna small, antennas with one side smaller than the resonant wavelength are often used, resulting in sensitivity to horizontal and vertical polarization. The radiation characteristics in this case are shown in Figure 10. (a) shows the radiation characteristics in the YZ plane, (b) shows the radiation characteristics in the XY plane, and (c) shows the radiation characteristics in the XZ plane.
The radiation characteristics (in dBd) in a plane are shown respectively.

As shown in the figure, the θ component Ee of the electric field in the XY plane is about -10 (dBd) in all directions other than the positive direction of the Y axis, so the vertical polarization
The transmission system had low sensitivity to vertical polarization, making it difficult to obtain high gain.

■Since it is installed in a metal casing, it is necessary to take into account the effects of the casing, which makes the design complicated.

■The price of portable radio equipment increases as the antenna element becomes more complex and precise.

The present invention was created in view of these points, and an object of the present invention is to provide a portable wireless device that has high gain, is less likely to be damaged, and is inexpensive.

[Means to solve the problem]

In order to achieve the above-mentioned object, a portable radio device of the present invention has an antenna terminal and is housed in a casing to which a belt-like member for carrying is attached, in which at least a part of the belt-like member is attached. , one or more conductive members are attached, and the conductive members and the antenna terminal are connected.

[For production]

In the portable wireless device of the present invention, the antenna made of a conductive material is attached to part or all of a carrying belt-like member such as a shoulder strap, so that the antenna is placed above the casing. Therefore, the influence of the casing is reduced. Furthermore, since a long conductive member can be used, it is possible to construct an antenna that is highly sensitive to vertically polarized waves, and a high gain can be achieved.

By using a flexible conductive member as the antenna, damage to the antenna is reduced and the antenna does not protrude to the outside. Therefore, since the structure is simple, high reliability and good operability can be obtained, and the cost is low.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

Figure 1 shows the portable wireless device in the first embodiment. In the figure, 11 is a radio housing, 12 is a handset, and 13
16 is the antenna, 17 is the radio circuit,
The 1st is the antenna terminal of the radio.

This portable radio device is equipped with a metal band that is conductive at high frequencies on the surface or inside of a belt 13, and is connected to an antenna terminal 18 of a radio circuit 17, so that this metal band operates as an antenna 16. It is adjusted to

FIG. 2 shows the horizontal plane (XY) radiation characteristics of the shawl with the wireless device housing 11 suspended by the belt 13. As shown in the figure, the influence of the radio equipment is small and a high gain can be obtained.

Batan averaging gain (Per
force analysis of a
Built-4n Planar Invert
d F Antenna for 800
MHz Band Portable Radio
Units: T, Taga, Ni, Tsunekawa
, IEEE TR5AC5JUNE 1987), when comparing the portable radio device of this embodiment with the conventional portable radio device shown in FIG. 9, the portable radio device of this embodiment has -
2CdBd], and the conventional portable radio is -4(dBd).
d).

Therefore, the portable radio device of this embodiment is 2 (
dB) high gain can be obtained. Furthermore, since a flexible metal band is used, the antenna 16 is less likely to be damaged. Further, since the antenna 16 does not protrude to the outside and has a simple structure, it is possible to construct an inexpensive portable radio device with high reliability and operability.

Figure 3 shows a portable wireless device in the second embodiment. In the figure, 35 and 36 are antennas, and 38° and 39 are antenna terminals.

This portable radio device has two metal bands attached to the shoulder strap from both ends of the belt 13, and the antenna terminal 38 of the radio circuit 17.
39 and arranged so that these metal strips act as antennas 35, 36.

Like the portable radio device of the first embodiment, it has features such as high antenna performance and resistance to damage.

Furthermore, since there are two lines of antennas, diversity reception is possible, and the length of the radio case in the horizontal direction is reduced to 1/2.
A sufficient diversity gain can be obtained with a wavelength of about 16 cm at 900 MHz.

In addition, when performing diversity reception in the conventional format, 2
Since the element is attached to the radio housing, it becomes very difficult to handle, but in the portable radio of the second embodiment, the antennas 35 and 36 do not get in the way, making it a highly convenient portable radio. be able to.

FIG. 4 shows a portable wireless device according to a third embodiment. In the figure, 40 is a phase shifter, 45 and 46 are antennas, and 48 is an antenna terminal.

This portable radio device, like the portable radio device of the second embodiment,
The shoulder strap is made by attaching metal bands to both ends of the belt 13 and attaching the antenna 4.
5.46, power is fed from one antenna terminal 48 to two antennas 4546 with the phases shifted by the phase shifter 40. By appropriately selecting the phase difference between the antennas, it is possible to shape the radiation pattern and weaken the radiation intensity in the direction where the human body is present.

FIG. 5 shows a radiation pattern when two dipole antennas separated by 1/2 wavelength have a phase difference of 180 degrees. As shown in the figure, if the antennas are spaced apart by about 1/2 wavelength, almost no radiation can be emitted in the direction parallel to the array of antennas.

In the case of the portable radio device of this embodiment, the side surface of the radio device housing 11,
That is, since the radiation intensity in the direction where the human body is present can be weakened, the shape of the radiation pattern does not change significantly during a call, and the influence of the human body can be reduced. Furthermore, the first. Similar to the second embodiment, this embodiment has features such as the antennas 45 and 46 being less likely to be damaged.

-Rotateru W Masu Sixth, a portable wireless device according to the fourth embodiment is shown.

In the figure, 65 is a linear antenna, 66 is a helical antenna, and 68 and 69 are antenna terminals.

The linear antenna 65 is sensitive to vertically polarized waves when the portable radio is worn on the shoulder, and the helical antenna 66 is sensitive to horizontally polarized waves in this state, so the phase difference between both antenna elements is The relationship coefficient is low and it functions as a polarized dipole antenna.

In particular, in a city or the like, there are complex reflections from surrounding buildings, so the ratio of vertical/horizontal polarization is small, and the portable wireless device of this embodiment can obtain a high diversity gain.

Figure 7 shows a portable wireless device according to a fifth embodiment. In the figure, 75 is a feed line, 76 is an antenna, and 78 is an antenna terminal.

The shoulder strap is a flexible power supply line 75 from the end of the belt 13 to the middle.
By running the feeder line 75, it is possible to use it as a sleeve antenna, and it easily resonates at 50 [Ω], so a general coaxial cable can be used as the feeder line 75, and the radiation pattern is also wireless. There are few changes due to the influence of the machine housing 11.

■1 Summary of 1 As described above, in each of the first to fifth embodiments described above, the shoulder strap has one or two metal band antennas, helical antennas, etc. on a part of the belt 13. and connect this antenna to the antenna terminal of the radio circuit 17. As a result, the influence of the radio device housing 11 is reduced because it is placed in the upper part.

Furthermore, since long linear elements are used, it is possible to construct an antenna that is highly sensitive to vertically polarized waves, making it possible to realize a high-performance antenna.

Furthermore, by using a flexible metal band as the antenna, there is less chance of damage to the antenna, and there is no external protrusion of the antenna, resulting in a simple structure, making it highly reliable and easy to operate, making it an inexpensive portable radio. machine can be configured.

In the embodiments of the present invention, a belt is used as a shoulder strap as a belt-like member for carrying, but the shoulder strap may be a string for use, and is not limited to a shoulder strap, but may also be a handbag.

Further, in the embodiment, one or two antenna elements are attached to a part of the portable belt 13, but there are cases where one antenna element is attached over the entire length of the portable belt, or three or more antenna elements are attached to a part of the portable belt 13. Possible modifications include attaching an antenna element.

〔Effect of the invention〕

As described above, according to the present invention, the shoulder strap is equipped with an antenna made of a conductive material over part or all of the carrying band member such as a belt, so that the antenna is less likely to be damaged and can be carried with high gain and low cost. Can configure radio equipment.

[Brief explanation of the drawing]

Fig. 1 is an external view of the first embodiment, Fig. 2 is a radiation characteristic diagram of the first embodiment, Fig. 3 is an external view of the second embodiment, Fig. 4 is an external view of the third embodiment, Fig. 5 is a radiation characteristic diagram of the third embodiment, Fig. 6 is an external view of the fourth embodiment, Fig. 7 is an external view of the fifth embodiment, Fig. 8 is an external view of a conventional portable radio, Figure 9 is an external view of a conventional portable radio, and Figure 10 is a radiation characteristic diagram of the conventional portable radio. In the figure, 11 is the radio housing, 12 is the handset, 13 is the shoulder strap, 16.35, 36, 45, 46.76 are the antennas, and 17
18.38, 39.4B, 68, 69.78 are antenna terminals, 40 is a phase shifter, 65 is a linear antenna, 66 is a helical antenna, and 75 is a feed line. Fig. 1 Fig. 2 Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. Fig. 2 -Ee ----E+

Claims (1)

[Claims] (1) In a portable radio device that has an antenna terminal and is housed in a casing to which a belt-shaped member for carrying is attached, one or more conductive members are attached to at least a part of the belt-shaped member, and this A portable radio device characterized in that a conductive member and the antenna terminal are connected.