Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2002-05-13
2003-11-11
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S791000, C343S882000
Reexamination Certificate
active
06646612
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an antenna used for wireless LAN and a wireless LAN device, and more specifically pertains to improvement of a non-directivity antenna for wireless LAN.
BACKGROUND OF THE INVENTION
The technique of wireless LAN has become common with a wide spread of the Internet and Intranets utilizing TCP/IP, one basic technique of the Internet. In the technique of wireless LAN, a wireless LAN device, instead of the conventional LAN cable, such as 10Base-T, is used for connection of the network with a computer. The wireless LAN device includes a pair of receiver-transmitter units. One unit is connected to the computer, while the other unit is connected to the LAN. There is communication between the pair of units by a power-saving communication technique with sufficient reliability, for example, Spread-Spectrum. The wireless LAN device enables the computer to freely access the Internet and Intranets, as in the case of wired connection with a LAN cable.
The wireless LAN device is used in a distance sufficiently communicable with an internal antenna, and is thus mainly used indoors. In the indoor use, however, the units of the wireless LAN device may be apart from each other by a relatively large distance, or some obstacle that interferes with smooth wireless communication, such as a tall bookcase, may be present between the units of the wireless LAN device. In such cases, sufficiently high-grade communication is not attainable with only the internal antenna. The lowered grade of communication and a resulting increase in noise may cause failure of communication or increase mistakes in communication. The increased mistakes in communication take time for their correction and retransmission, thus undesirably lowering the substantial communication speed.
External antennas have bean used for improvement in state of communication between wireless LAN devices. The external antennas include directivity antennas and non-directivity antennas. The directivity antenna is advantageous for high-grade communication between antennas facing each other, but has a low degree of freedom in installation. The non-directivity antenna, or the other hand, an allows communication in a wide surrounding range and accordingly has a high degree of freedom in installation.
SUMMARY OF THE INVENTION
The object of the present invention is thus to widen a communicable range in a vertical direction of an antenna device for wireless LAN utilizing a non-directivity antenna. The antenna device for wireless LAN includes a base module having a predetermined area, and an electrically conductive reflector plate held in the based module. An antenna main body having no directivity around an axis is received in a columnar case, which is connected to the base module with a degree of freedom in at least one axis. In the antenna device for wireless LAN, the reflector plate held in the base module widens the range of directivity in the vertical direction, thus enhancing the communication performance of the external antenna in offices and other places.
In this antenna device, the columnar case is connected to the base module with the degree of freedom in at least one axis. The angle of the case is accordingly variable in an allowed direction. While the antenna has non-directivity around the axis, the directivity of the antenna is adjustable in the vertical direction, so that the antenna can be installed at a desired direction that ensures stable communication.
REFERENCES:
patent: 5644320 (1997-07-01), Rossi
patent: 6023249 (2000-02-01), Fujita et al.
patent: 6292146 (2001-09-01), Melax
patent: 6362794 (2002-03-01), Yu
patent: 6475022 (2002-11-01), Tomino et al.
patent: 6522303 (2003-02-01), West et al.
Matsuura Nagahiro
Noguchi Wataru
Beyer Weaver & Thomas
Chen Shih-Chao
Melco Inc.
Wong Don
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