Communications: radio wave antennas – Antennas – Microstrip
Reexamination Certificate
2000-11-10
2002-11-26
Ho, Tan (Department: 2821)
Communications: radio wave antennas
Antennas
Microstrip
C343S754000, C343S766000
Reexamination Certificate
active
06486832
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an antenna system, and more particularly, to an antenna system for communications in a wireless network.
2. Background Art
Omni-directional antennas have been implemented in various types of mobile communications devices in a conventional wireless network, for example, a digital mobile telephone network. In addition to voice communications, attempts have been made to provide high speed data communications between various types of apparatus including, for example, desktop computers, laptop computers, servers, peripherals and power management hubs in a wireless network. Compared to voice communications, data communications typically require a large bandwidth, a very low bit error rate, and ability to communicate with multiple devices at different physical locations.
To ensure high speed transmission of data at a very low bit error rate, a relatively high signal to noise ratio (SNR) at radio frequency (RF) is required to carry the data transmitted and received by the various apparatus in a conventional wireless network. Because of the spread of RF power over all directions in space by a typical omni-directional antenna in a conventional mobile wireless device, such as a mobile telephone, communications with such devices may occur only over relatively short distances. Furthermore, in a typical mobile wireless network, the locations of at least some of the communications apparatus are not fixed with respect to each other, thereby further complicating the transmission and reception of data by different apparatus within the network.
It is desirable that high speed data links be established in a mobile wireless network with a high degree of data integrity while obviating the need for high power RF transmissions by mobile communications apparatus. Furthermore, it is desirable that high speed data links be maintained between different mobile communications apparatus in a wireless network even though the spatial locations of the apparatus may not be fixed with respect to each other.
SUMMARY OF THE INVENTION
The present invention provides a direction-agile antenna system for communications in a wireless network, generally comprising:
an antenna capable of transmitting an electromagnetic signal in a direction having an antenna gain; and
a controller connected to the antenna, the controller capable of generating a direction-selection signal to steer the electromagnetic signal to a selected direction corresponding to a high gain position in response to detecting an expected signal transmitted within the network.
Advantageously, the direction-agile antenna system in an embodiment according to the present invention is capable of transmitting electromagnetic signals carrying digital data to an apparatus for which a transmission is intended with concentrated power density, thereby allowing a high rate of data transmission with a high degree of data integrity over a relatively long distance, while obviating the need for a high transmitted radio frequency (RF) power level. Furthermore, the direction-agile antenna system in an embodiment according to the present invention allows different apparatus to maintain instantaneous communications within a mobile wireless network even though the spatial positions of the apparatus may not be fixed with respect to each other.
REFERENCES:
patent: 4881081 (1989-11-01), Yoshihara
patent: 5594460 (1997-01-01), Eguchi
patent: 5726661 (1998-03-01), Fuji
patent: 6124832 (2000-09-01), Jeon et al.
patent: 6229480 (2001-05-01), Shintani
patent: 6278405 (2001-08-01), Ha et al.
Abramov Oleg Y.
Kashkarov Alexander G.
Kirdin Alexander N.
AM Group
Ho Tan
Tachner Leonard
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