Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2000-08-03
2001-10-02
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S793000
Reexamination Certificate
active
06297779
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an antenna module and more particularly, to a dipole antenna module operating in a frequency range of 2.40~2.50 GHz for a portable computer.
2. Description of Prior Art
Today, more and more portable computers are being linked with other electrical equipment using wireless telecommunication instead of cabling, defining a WLAN (Wireless Local Area Network) for exchanging data or other signal information. Wireless communication requires that a portable computer be equipped with an antenna module capable of effectively transmitting and receiving electrical signals. A prior art dipole antenna consists of two aligned antenna arms which can only transmits/receives signals in a predetermined direction. This limitation hinders the performance of the portable computer, which is intended for use in a movable application. Furthermore, the performance of the antenna is affected by environment, wherein many sources of reflection may be present. Moreover since the size of the portable computer is of primary concern, the size/volume of the antenna should also be reduced, in particular, when the antenna is located at the corners of the display or body of portable computer. U.S. Pat. No. 5,677,698 discloses an antenna arrangement comprising a slot antenna element. The slot antenna element is located between a dielectric material and a ground plane. When two slot antennas are used to form a diversity configuration, they are connected in such a way that only one antenna which receives a stronger signal will be selected for use while the other is not. The use of two antennas wastes valuable space in the portable computer and is costly.
U.S. Pat. No. 5,966,098 discloses an antenna system comprising a dipole antenna having antenna arms of different lengths, and an impedance matching circuit provided for electrically connecting the antenna arms to the device to increase the antenna gain. Thus, said antenna system not only takes more space, but also has a complicated structure due to an additional impedance matching circuit.
Hence, an antenna module is required to overcome the disadvantages of the prior art and for use with the proliferation of WLANs.
SUMMARY OF THE INVENTION
A first object of the present invention is to provide an antenna module that is compact and simplified and which can be fabricated easily.
A second object of the present invention is to provide an antenna module which can be placed inside the portable computer and has improved performance.
A third object of the present invention is to provide an antenna module that transmits/receives signals from multiple directions and is less sensitive to directional orientation or environment.
An antenna module in accordance with the present invention comprises a wire first dipole antenna arm oriented in a first direction and a wire second dipole antenna arm oriented in a second direction perpendicular to the first direction, said two arms being respectively electrically connected to a printed circuit board at two points, a gap being formed between said two points and no additional matching circuitry. Said two antenna arms are connected to the associated transmitting/receiving circuitry of portable computer by a coaxial cable having an central core electrically engaging with the first dipole antenna arm, and a sheath electrically engaging with the second dipole antenna arm. Therefore, electromagnetic signals can be transmitted at the same frequency from the same electrical circuit but in different directions. The antenna module can be placed at a corner of a portable computer, providing improved performance.
Other objects, advantages and novel features of the invention will become more apparent from the following detailed description of the present embodiment when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 5821903 (1998-10-01), Williams
patent: 5867131 (1999-02-01), Camp, Jr. et al.
patent: 5966098 (1999-10-01), Qi et al.
Chung Wei Te
Hon Hai - Precision Ind. Co., Ltd.
Le Hoang-anh
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