JPS6236904A - Antenna for portable radio equipment - Google Patents

Abstract

PURPOSE:To obtain a portable radio equipment antenna incorporated with a cooling function by sealing a liquid in a hollow part of an insulating cylinder to form a heat pipe and providing a coil conductive part on the surface of the peripheral of the cylinder or the inside of a side wall so as to apply heat dissipation. CONSTITUTION:The heat from a heat element in a case of a portable radio equipment reaches a fitting part 14 of an antenna 10 via a seat. The operating liquid in a chamber 15 is evaporated by the heat and the entire inner face of the cylinder 12 made of a insulating material and the heat is dissipated externally from the outer face. Further, the vapor is liquidified and the liquid returns to the fitting part 14 by gravity and wings provided to the inner wall to cool the heat element again. On the other hand, an electrical signal from an electronic circuit placed in the case is transmitted or received from a coil- shaped conduction part 11 through a conducting part. Thus, a heat sink or the like is not required by dissipating the heat generated in the radio equipment in this way, and the size is decreased for a radio equipment for a high output.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an antenna for a small portable radio device that efficiently cools a power amplifying heating element that affects the transmission performance of the radio device.

[Conventional technology]

A conventional device of this type is shown in FIG. In the figure, 1 is a housing of a portable radio, 2 is an electronic circuit housed inside the case, 3 is a heating element (semiconductor for power amplification) that becomes hot during transmission, and 3a and 3b are 1. This is the second heating element. Further, 4a is a heat radiation part for cooling the heating element 3a, and 4b is a housing 1 for cooling the heating element 3b.
5 is an antenna for transmitting and receiving radio waves, 5a is a seat for attaching the antenna 5, and 5b is a conductive part for electrically connecting the antenna 5 and the electronic circuit 2.

Next, the operation will be explained.

The heat from the first heating element 3a is conducted to the first heat radiating part 4a, transmitted to the air inside the housing 1, and then radiated to the outside air through the housing 1.

The heat from the second heating element 3b is conducted to the housing 1 through the second heat radiating part 4b and is radiated to the outside air. For this reason, it is better for the former heat dissipation portion 4a to be larger, and for the latter to have a thicker wall thickness.

In addition, the stronger the bonding between the heat dissipation part 4b and the housing 1, the better.
If it is a welded or integral structure, it will cool even better.

Note that generally only one of the heating elements 3a and 3b is used.

[Problem that the invention seeks to solve]

Since conventional devices are configured as described above, the surface area of the heat dissipation fins or the housing must be large and the wall thickness must be increased.Furthermore, since it is held and operated by hand, it must be kept at a low temperature so that it does not get hot. This had the disadvantage of making it a large and heavy portable radio.

The purpose is to provide antennas for

[Means for solving problems]

The antenna for a portable radio according to the present invention has a so-called heat pipe structure by sealing a liquid in the hollow part of a cylinder made of an insulating material, and a coil-shaped conductive part is provided on the outer peripheral surface or inside the side wall of the cylinder. It is also designed to dissipate heat.

[Effect]

In this invention, since the antenna has a heat pipe structure, by using the antenna in a radio device, the heat of the heat generating element of the radio device is directly transported to the antenna placed outside the housing, and the heat is radiated from the entire surface of the antenna. be able to.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an antenna for a portable wireless device according to a first embodiment of the present invention. In the figure, IO is an antenna having a heat pipe structure, 11 is a conductive part wound in a coil shape, and 12 is a main body having a heat pipe structure. A cylindrical body made of an insulating material, 13 a cap for sealing a heat transporting liquid inside, 14 a fitting part for fixing the antenna 1o, and 15 a sealed room.

Further, FIG. 2 shows a second embodiment of the present invention, and in the figure,
Reference numeral 11 indicates a coiled conductive portion forming a skeleton, and reference numeral 12 indicates a hollow cylinder having the coiled conductive portion 11 as a core and surrounding it with an insulator.

FIG. 3 is a conceptual diagram of a portable wireless device using the above-mentioned antenna 1o, where ■ is a housing, 2 is an electronic circuit, 3 is a heating element which is one of the circuit components, and 1o is the above-mentioned heat pipe structure. An eggplant antenna, 10a is a heating element 3 and an antenna 10
The mounting seat 10b mediating the thermal connection is a conductive part for electrically connecting the electronic circuit 2 and the antenna IO.

Next, the operation will be explained.

Above 1. In the second embodiment, the heating element 3 reaches the fitting part 14 of the antenna 10 via the heat sink 10a (
(See Figure 3). By heating the fitting part 14, the working liquid in the chamber 15 evaporates, the inner surface of the cylinder 1 made of an insulator is heated, and the heat is released from the outer surface to the outside air (the first
Figure reference @).

Further, the vapor becomes a liquid and returns to the fitting part 14 by gravity and the wick provided on the inner wall to cool the repeating element 3.

On the other hand, electric signals are transmitted and received from the electronic circuit 2 through the conductive part 10b and the coiled conductive part 11.

In this way, the above 1. According to the second embodiment, the heat generated inside the radio device is dissipated in the antenna section, so the radio device does not require a heat dissipation section, and even if it is a high-output radio device, it can be compact. You can get something.

Furthermore, in the first embodiment, the coiled conductive part 11 and the cylinder 12 made of an insulator are separable and can be manufactured separately and combined to complete the coiled conductive part 11 and the cylinder 12 made of an insulator. Since the cylindrical body 12 made of an insulating material is integrated, the coiled conductive portion 11 serves as a core of the insulating material and can reinforce the cylindrical body 12 made of an insulating material.

Nao, 1st above. In the second embodiment, the cap and the fitting part are shown as being able to be separated from the cylindrical body, but either of them may be integrated with the cylindrical body.

Also, the above 1. In the second embodiment, the sealing opening is provided in the cap, but this may be provided in the fitting portion.

Also, the above 1. Although the second embodiment shows the case where the antenna is fixed to the seat by the fitting part, it is also possible to fix the antenna directly to the housing or the heating element, and the same method as in each of the above embodiments can be used. be effective.

〔Effect of the invention〕

As described above, according to the antenna for a portable radio device according to the present invention, a liquid is sealed in the hollow part inside the antenna, and heat is radiated by repeating evaporation and liquefaction of the liquid, so that the antenna can be used as a radio device. By using this, there is no need for a heat dissipation section inside the device, and there is an effect that a compact, lightweight, and high-output portable radio device can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the structure of a portable radio antenna according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing the structure of a portable radio antenna according to a second embodiment of the present invention. 3 are front sectional views showing the structure of a portable radio device using the antenna according to the present invention, and FIG. 4 is a front sectional view showing the structure of a conventional portable radio device. 10... Antenna, 11... Coiled conductive part, 12
... Cylindrical body made of an insulating material, 13 ... Cap, 14
...Mating part, 15...room. In the drawings, the same reference numerals indicate the same or equivalent parts. Figure 1 Figure 2111 10nia 7 nt f13::pp gua. 11 nib I/l, -:lX'gft 14:1li
4JI312koJtJfU and 71/Ge5S25fq
l$154? Cofi% Figure 3 Figure 4

Claims (2)

[Claims] (1) A cylindrical body made of an insulating material and having a hollow part filled with a liquid for heat transport, and a coiled conductive part provided on the outer peripheral surface or inside the side wall of the cylindrical body. An antenna for a portable radio device, characterized by comprising: (2) The antenna for a portable radio device according to claim 1, wherein the coil-shaped conductive portion is made of metal.