JPH0531386U - Information processing equipment - Google Patents

Abstract

(57) [Summary] (Modified) [Objective] To provide a portable small-sized information processing device with a transmitting / receiving function capable of preventing a decrease in error rate by suppressing the influence of fading. [Structure] A portable information processing device having a wireless transmission / reception function and capable of mobile communication is provided with two antennas 5 and 6 having the same function.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an information processing apparatus, and more particularly to a portable information processing apparatus such as a notebook type, a book type, a laptop type, etc., having a wireless communication function.

[0002]

[Prior Art]

 In recent years, various information processing apparatuses having wireless terminals for general subscribers of public telephone networks and having a wireless LAN function for short-distance high-speed communication are being widely used. This kind of information processing device generally has one antenna, and is configured to be able to transmit and receive by wireless communication with a base station or a host station via this antenna, and has a limited service area. Used to carry data and information within.

[0003]

[Problems to be solved by the device]

 However, in the conventional information processing apparatus of this type, a radio wave having a frequency higher than an ultra-high frequency is generally used, but when receiving from a base station or a host station, for example, if it is outdoors, it may be affected by the surrounding topography and structures. If indoors, it is reflected by surrounding structures and obstacles, and the reflected wave and the direct wave interfere with each other, and the strength of the received electric field fluctuates greatly depending on the receiving position.

That is, in such a case, in reality, a plurality of reflected waves reach the receiving point together with the direct wave, but the received field strength at the receiving point is only the direct wave and the ground reflected wave by simplifying the model. Then, the received electric field strength E is expressed by the following equation.

[0005]

[Equation 1]

Here, E ₀ : Received electric field strength in free space (without reflected wave) λ: Wavelength d: Transmission point, distance between reception points h ₁ h ₂ : From transmission point and ground at reception point Distance (height) As is clear from the above formula (1), there may be a receiving point where the received electric field strength becomes zero due to the relationship of λ, d, h ₁ and h ₂ . Note that the above equation is for the case where the reflection coefficient of the reflector (ground) is 1, but such an ideal condition does not actually exist, the reflection coefficient differs depending on the reflector, and there are multiple reflected waves. In reality, the received electric field strength changes irregularly and greatly depending on the receiving position.

Further, when the receiving point moves during reception, the error occurrence rate is extremely reduced due to a so-called fading phenomenon in which the received electric field strength changes with time. Furthermore, when radio waves are transmitted to the base station or the host station, the error rate similarly decreases due to the same reason.

The object of the present invention is to pay attention to the conventional problems as described above, and to prevent the decrease of the error rate by suppressing the influence of fading. In particular, it is small for portable use and easy to use. It is to provide an information processing device with an antenna.

[0009]

[Means for Solving the Problems]

 In order to achieve such an object, the present invention provides a portable information processing device capable of wireless communication within a predetermined area and capable of mobile communication, and two antennas having the same function with respect to the transmission / reception function. Is arranged.

[0010]

[Action]

 According to the present invention, since two antennas having the same function are provided, the influence of fading phenomenon can be suppressed and the transmission / reception function can be enhanced by the spatial diversity technology.

[0011]

【Example】

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

FIG. 1 shows an embodiment of the present invention, in which (A) and (B) show a use state, and (C) shows a folded state suitable for carrying or storing. In these figures, 1 is a keyboard as a thin box-shaped input device as an input device, and 2 is a display device as an output device whose one end is rotatably supported by a casing of the keyboard 1. The keyboard 1 and the display 2 are respectively provided with a circuit board (not shown) related to the information processing function, each module related to the transmission / reception function, and the like. Are electrically connected.

Further, in the case of this example, the solar cell 4 is provided on the back surface 2B side of the display portion 2A of the display 2, and the solar cell 4 is provided in the usage state as shown in (A) and (B) and (C). The solar cell 4 is exposed to the outside in any of the folded states as shown.

Furthermore, 5 and 6 are a first antenna and a second antenna having the same function for transmission and reception, which are on the upper side of the display 2 so that transmission and reception can be easily performed when the information processing apparatus main body is in use. These two antennas 5 and 6 are arranged so as to keep a predetermined distance in position.

The portable information processing device configured as described above is used for transmitting and receiving wireless data and the like within the service area of the base station or host station. Since the second antenna 6 is provided at a position keeping a predetermined distance from the first antenna 5 even if it is in the position where Can be avoided by applying the technology of space diversity. In this way, it is possible to improve the communication state with the base station or the host station via either the first antenna 5 or the second antenna 6.

In this case, even if the number of antennas is two, it is not necessary to dispose two sets of wireless transceivers in the device, and there is no need to arrange between the two antennas 5 and 6 and one set of transmission / reception module. It is only necessary to provide a combining and distributing circuit such as a known 3 dB coupler. Further, although the first antenna 5 and the second antenna 6 are made to project from the main body of the device in this example, a part or the whole of the antenna is incorporated in the device and used. Good.

Furthermore, in the present embodiment, since the solar battery is provided in the exposed portion of the device, a secondary battery is generally used in this kind of small information processing device, but the device is consumed by the consumption of the secondary battery. It can prevent the battery from becoming unusable and can also be used for charging a battery having a secondary battery.

Further, in the above-mentioned embodiments, the case of the information processing apparatus having the LAN function of the folding type, which includes the keyboard and the flat panel display, has been described, but the application of the present invention is as follows. It is needless to say that the present invention is not limited to information processing devices, and can be widely applied to devices used in systems capable of transmitting and receiving while moving, such as portable wireless telephones of this type and vehicle-mounted information processing devices.

[0019]

[Effect of the device]

 As described above, according to the present invention, in a portable information processing device having a wireless transmission / reception function within a predetermined area and capable of mobile communication, two antennas having the same function as the transmission / reception function are provided. The spatial diversity technology can suppress the error rate reduction due to the effect of fading, and in particular, the extreme reduction of the received electric field strength can be prevented, contributing to the shortening of the transfer time at the time of retransmission. In addition to this, it is possible to effectively use the battery drive time, and further, the solar cell can contribute to prolonging the life of the backup battery.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention in a used state (A) and (B) and a folded state (C).

[Explanation of symbols]

 1 keyboard 2 display 3 rotating part 4 solar cell 5, 6 antenna

Claims (1)

[Scope of utility model registration request] 1. A portable information processing device having a wireless transmission / reception function within a predetermined area and capable of mobile communication, wherein two antennas having the same function with respect to the transmission / reception function are arranged. Information processing device.