JPH03173227A - Portable radio equipment - Google Patents

Abstract

PURPOSE:To obtain a sufficient antenna gain even when an antenna element is contained in a radio equipment case by providing a mechanism sending a high frequency energy between 1st and 2nd antenna elements in the contained state. CONSTITUTION:Since a 2nd antenna element 9 is not connected while a 1st antenna element 2 is extracted and only the 1st antenna element 2 is active, the antenna shows the same characteristic as that of a usual extraction type portable telephone set. On the other hand, while the 1st antenna element 2 is contained, the 1st antenna element 2 connects to the 2nd antenna element 9 by a transmission mechanism 10. Thus, a high frequency current is induced in the 2nd antenna element 9 and since the element is placed on the surface of the case, the radio wave is radiated into free space efficiently.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a portable radio device in which an antenna element can be housed in a radio device housing, and in particular, a portable radio device in which an antenna element can be housed in an Ml-free housing. The present invention relates to a configuration of an FA band type radio device that can obtain a high antenna gain in the state C.

[Conventional technology]

FIG. 7 is a perspective view showing the configuration of a conventional mobile phone. (,i) is a state in which the antenna element is protruded from the casing, and (b) is a state in which the antenna element is housed in the casing. It shows.

In the figure, 51 is inside the radio device housing, 52 is an antenna element, 53 is a matching circuit, 54 is a battery case, 55 is a receiver, 56 is a transmitter, 57 is a radio circuit section, and 58 is a feeding point.

Since the antenna element of such portable radio devices with an antenna element that protrudes outside the housing is very obtrusive, they often have a mechanism that allows the antenna element to be stored in the housing to make it easier for people to carry it. .

Normally, such portable radios are designed so that the antenna characteristics are best when the antenna element is extended as shown in the figure (,), so the antenna as shown in the figure (b) is When the element is housed, the antenna characteristics are significantly degraded.

[Problem to be solved by the invention]

As mentioned above, when the antenna element is housed in the housing,
Taking the case of transmission as an example, the factors that cause the antenna characteristics to deteriorate can be considered as follows.

In FIGS. 7(,) and (b), the positional relationship of the seven antenna elements as seen from the matching circuit remains the same except that the top and bottom are reversed.

That is, since in FIG. 2(a), power is fed from the bottom end of the antenna element and the antenna element resonates, in FIG. 2(b), power is also fed from the top end of the antenna element and the antenna element almost resonates. However, the high-frequency energy induced on the antenna when the antenna is retracted is not radiated to the outside because it is surrounded by a metal casing and batteries (in the case of reception, the high-frequency energy induced on the antenna is reduced). do).

The frequency is 1900MHz and the antenna element length is 15c in the t5Q diagram.
2 shows the relationship between the length of the antenna element pulled out from the casing and the power supplied to the antenna element from the feeder line for the portable radio device No. m.

According to the figure, if the case where the antenna element is completely pulled out is OdB, even when the antenna element is completely retracted, -2.5 dB of power is supplied to the antenna element.

However, as a result of actual measurements, the gain when fully retracted is 12
dBd (Guipole antenna ratio), whereas the gain when completely retracted was -15 dBd or less. This result supports the above reason.

In this way, a portable radio device that can accommodate a conventional antenna element in a non-#1lfi casing has the antenna element housed in the casing! ! ! (For example, when a person carries a portable wireless device in a bag, etc.), the antenna characteristics deteriorate significantly. However, it has the disadvantage that incoming calls may not be received.

In view of these conventional problems, the present invention provides a portable wireless device in which an antenna element can be housed within a radio housing.
The purpose of this invention is to realize a means by which sufficient antenna gain can be obtained even when seven antenna elements are housed in a housing in Hfl.

[Means to solve the problem]

According to the invention, the above-mentioned object is achieved by the means specified in the claims.

That is, the present invention has a structure in which it is possible to select either a state in which the antenna protrudes outside the radio device casing or a state in which the antenna is housed inside the radio device casing, and the antenna is made to protrude. In both the state and the stored state, the first antenna element that is electrically connected to the internal radio circuit, the second antenna element that is not directly connected to the internal radio circuit, and the radio frequency energy This portable wireless device includes a mechanism for transmitting data between a first antenna element and a second antenna element in a stored state.

[For production]

In the present invention, it is possible to artificially select two states, a state in which the antenna element protrudes outside the radio device casing and a state in which the antenna element is housed inside the radio device casing, depending on the usage situation. When the antenna element is housed inside the chassis, high-frequency energy is transmitted between the first antenna element and the second antenna element in the housed state. By forming it on the surface, etc., the antenna characteristics do not deteriorate even when the first antenna element is housed, and a high gain can be obtained.

Therefore, as mentioned above, it is possible to realize a portable wireless device with high serviceability that can receive incoming calls at a high rate even when a person carries the portable wireless device in a bag or the like. be able to.

[Embodiment] Fig. 1 is a diagram showing a first embodiment of the present invention, in which 1 is a #l-less iso casing, 2 is a first antenna element, 3 is a matching circuit, 4 is a battery case, and 5 is a diagram showing a first embodiment of the present invention. is a receiver, 6 is a transmitter, 7 is a radio circuit, 8 is a power supply, (χ, 9 is a second antenna element in the form of a mower ball made of a metal plate, and 10 is a first antenna element and a second antenna element when stored. It represents a transmission mechanism connecting two antenna elements.

In the figure, when the first antenna element 2 is pulled out, the second antenna element 9 is not connected and only the first antenna element operates, so it exhibits the same characteristics as a normal pull-out type mobile phone.

On the other hand, when the first antenna element 2 is stored, the first antenna element 2 is connected to the second antenna element 9 by the transmission mechanism 10.

In this example, the length of the first antenna element 2, the transmission mechanism 10, and the second antenna element 9 is adjusted so that the total length is about one electrical wave, so the feeding point impedance is This is the same as when only one antenna element 2 is connected.

This induces a high frequency current in the second antenna element 9, which is formed on the surface of the casing, and is efficiently radiated into free space (i.e., high gain even when the antenna element is retracted). ).

Figure 2 shows the gain characteristics of the antenna element of this example when it is standing upright.The dotted line indicated by letter group B is the characteristic when the antenna element is pulled out in the Z direction, and the solid line indicated by letter group A is the characteristic when it is retracted. It shows.

The gain in the figure is the batan averaged gain (references:
T, T aga and K, T suneka
wa, ABuit-in D 1versity
Antenna for 800MHz Band
Portable Radio Units
IEEE AP-8 nt, Symp,
oi&, + Vol.

2, pp. 705-708 June 1986)
It was evaluated using

This is a mobile-free #a8! It estimates the gain in a multiple wave environment such as in a city, where 0 dBd is the level of the Guibor antenna.

When the portable radio is set up near the swing point (930MHz) when it is stored, a gain of about -8clBd is obtained.
A gain higher than 10 dBd is obtained compared to a decrease of about -20 dBd when this mechanism is not used.

FIG. 3 is a diagram showing the types of transmission mechanisms, and (a) is a diagram showing the method of transmitting high-frequency energy between the first antenna element and the second antenna element when stored. (b) is a method of spatially coupling the two; (c) is a method of transmitting directly with a metal wire or metal plate 10, and (c) is a method of sending a conductor wire or a conductor plate that amplifies high frequency energy near the first antenna element when it is stored. A method is shown in which a tube is provided or a tube that wraps around the antenna element is placed, and these and a second antenna element are connected with a metal wire or a metal plate.

In the figure, 1 is a non-metallic body, 2 is a first antenna element, 3 is a matching circuit, 9 is a second antenna element made of a metal plate, and 10 is a metal wire or metal plate. The transmission mechanism 11 represents a pickup element for high frequency energy.

The most appropriate mechanism may be selected depending on the structure of each mobile phone.

@4 Figure is a diagram showing a second embodiment of the present invention, and 1
is a radio device housing, 2 is a first antenna element, 3 is a matching circuit, 4 is a battery case, 5 is a receiver, 6 is a transmitter, 7
is a radio circuit section, 8 is a feeder, and 10 is a transmission connecting the first antenna element and the second antenna element when stored. fi6ff, 12 represents a second antenna element in the form of a plate-like inverted F-shaped antenna element made of a metal plate.

In this case as well, the transmission mechanism can adopt various methods as shown in FIG. 3 above.

In this embodiment, since the second antenna element 12 is a plate-shaped inverted F-shaped antenna, the element efficiency is high, and
Depending on the positional relationship between the feeding point and the short stub, resonance can be achieved with any impedance.

Furthermore, the radiation pattern can be designed depending on where in the housing the second antenna element is attached. In this example, the second antenna element 12 is attached to the side surface of the housing so that a high gain can be obtained when the housing is laid down (Reference Document 2, supra).

As the second antenna element, any antenna element that can be constructed in a flat plate shape, such as a microstrip antenna, can be used.

FIG. 5 is a diagram showing a third embodiment of the present invention, in which 1 is a #I-less machine casing, 2 is a first antenna element, and 13 is constructed by making a slot in a metal plate surface. A second antenna element is represented.

In this case as well, the transmission mechanism can adopt various methods as shown in FIG. In this embodiment, slots are cut in the metal surface of the casing or in the metal plate spread on the casing, and the second seven antenna elements can be configured very compactly.

By efficiently radiating high frequency energy induced when the first antenna element 2 is retracted from the slot antenna, a high gain can be obtained even when the antenna element is retracted, as in the previous embodiment.

FIG. 6 is a diagram showing a fourth embodiment of the present invention, in which 1 is a #1 non-aircraft casing, 2 is a first antenna element, 10 is a transmission mechanism made of a metal wire or a metal plate, 14 represents a second antenna element constructed by making the battery case made of metal.

In the case of this embodiment as well, the transmission mechanism can adopt various methods as shown in FIG.

In this implementation, since a metal battery case is used as the antenna element, the second antenna element can be configured without providing a metal plate for the antenna element, and the antenna element is relatively large. Therefore, a high gain can be obtained.

〔Effect of the invention〕

As explained above, the portable wireless device of the present invention has little deterioration of antenna characteristics when the antenna element is housed, and can obtain high gain. As a result, even when a person carrying a radio device is carrying the portable radio device in a bag or the like with the antenna element stowed, the present invention can be applied. By doing so, there is an advantage that a mobile phone service with high serviceability can be realized.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the first embodiment of the present invention, Fig. 2 is a diagram showing the gain characteristics when the antenna element of the embodiment is upright, Fig. 3 is a diagram showing the types of transmission mechanisms, and Fig. 4 is A figure showing the second embodiment of the present invention, @5 figure is a figure showing the third embodiment of the present invention,
FIG. 6 is a diagram showing the fourth embodiment of the present invention, FIG. 7 is a diagram showing the configuration of a conventional portable radio, and FIG. 8 is a diagram showing the relationship between the height of the antenna element and the power supplied to the antenna element. FIG. 1...Radio device housing, 2......
First antenna element, 3...Matching circuit, 4...Battery case,
5...Telephone receiver, 6...Transmitter, 7...Radio circuit section, 8.
...Feeding, α, 9 ....Second antenna element in the form of a monoball made of a metal plate, 10
...Transmission mechanism that connects the first antenna element and the second antenna element when stored, 11...
・・・High frequency energy pickup cable,
12...--Second antenna element in the form of a plate-like inverted F-shaped antenna element made of a metal plate, 13.
...Second antenna element constructed by making a slot in the metal & surface, 14 ...Second antenna element constructed by making the battery case made of metal

Claims (1)

[Scope of Claims] It has a structure in which it is possible to select either a state in which the antenna protrudes outside the radio device casing or a state in which the antenna is housed inside the radio device casing, and the antenna is made to protrude. In both the closed and retracted states, the first antenna element is electrically connected to the internal radio circuit, the second antenna element is not directly connected to the internal radio circuit, and the radio frequency energy What is claimed is: 1. A portable radio device comprising a mechanism for transmitting between a first antenna element and a second antenna element in a stored state.