Communications: radio wave antennas – Antennas – With vehicle
Reexamination Certificate
1999-12-23
2001-11-13
Wong, Don (Department: 2821)
Communications: radio wave antennas
Antennas
With vehicle
C343S702000
Reexamination Certificate
active
06317089
ABSTRACT:
BACKGROUND OF THE INVENTION
Many hand-held personal communication transceivers in use, such as cellular and PCS phones and two-way radios, each has a relatively small attached antenna. When such hand-held transceivers are used in a radio frequency-shielded place such as the interior of an automobile, there is high attenuation of incoming and outgoing signals, resulting in poor performance. Although it would be possible to connect the transceiver to an antenna on the outside of the vehicle by plugging in a connector at the end of a cable, many hand-held transceivers have no provision for connection to external antennas.
Prior art couplers for coupling hand-held transceivers to outside antennas, have used inductive coupling to transfer radio frequency electromagnetic energy between the transceiver and a coaxial cable that extends to the antenna, without direct connection through a plug-and-socket connector. Such inductive couplers have included cradle-like holders that surround the main housing, sleeves that can be slid over the antenna, or combinations of the two, to provide coils that surround one or more radiating elements of the transceiver. Inductive coupling to the antenna only, is inefficient because it involves only a small portion of the total radiator circuit. Furthermore, the inductive coupling schemes are often cumbersome. It is noted that it is generally undesirable to provide amplifiers to amplify signals picked up by the inductor prior to transmission by the auxiliary antenna or to amplify signals picked up by the auxiliary amplifier prior to inductively coupling the signals to the transceiver, since the need to supply additional batteries or a connector to the cigarette lighter of an automobile results in increased cumbersomeness and cost. Apparatus for transferring energy between a hand-held transceiver and an auxiliary antenna, which transfer a greater proportion of the available energy than heretofore, using a coupler which minimizes restrictiveness on the use of the hand-held transceiver within the vehicle, would be of value.
SUMMARY OF THE INVENTION
In accordance with one embodiment of the present invention, a coupler is provided for transferring radio wave energy between a hand-held transceiver and a transmission line such as a coaxial cable that extends to an auxiliary antenna. The coupler transfers a high proportion of available energy in a coupler of low cost and low cumbersomeness. The coupler includes a pair of capacitive coupling elements for detecting energy transmitted by the transceiver and for transmitting energy for pick up by the transceiver. Each coupling element is positioned adjacent to a different one of the radiating elements of the hand-held transceiver, with the two conductors of a coaxial cable each connected to a different one of the coupling elements. An upper coupling element which lies adjacent to the upper radiator of the transceiver, has a lower end connected to one conductor of the cable, while the lower coupling element that lies adjacent to the lower radiator of the transceiver has an upper end connected to the other conductor of the cable. The coupling elements are preferably formed as sheets of conductive material on a dielectric substrate, with the substrate attached to one of the side walls or the rear wall of the transceiver and connected by a cable to the auxiliary antenna.
Although particular embodiments of the invention have been described illustrated herein, it is recognized that modifications and variations may occur to those skilled in the art, and consequently, it is intended that the claims be interpreted to cover such modifications and equivalents.
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Buren Alan Van
Wilson James W.
Dinh Trinh Do
Rosen Leon D.
Wilson Electronics, Inc.
Wong Don
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