An antenna system and a radio communication device including...

H - Electricity – 01 – Q

Patent

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H01Q 11/08 (2006.01)

Patent

CA 2332463

An antenna system including an antenna device and feed device for transmitting and receiving circularly polarised RF waves in a first mode of operation and of linearly polarised RF waves in a second mode of operation, and a hand-held mobile communication device provided with such an antenna system. A radiating structure (10) including N helical radiating elements (12A-D), being coextending and coaxially arranged on a support structure (11) are fed in order to provide for transmission/reception of circularly polarised RF waves in the first mode of operation. N is an integer greater than one. Further, means (24A-D, 16, 17, 19, 25, 25A) are arranged for essentially uniform excitation of the helical radiating elements (12A-D) in order to provide for transmission/reception of linearly polarised RF waves in the second mode of operation.

L'invention se rapporte à un système à antenne comportant un dispositif faisant office d'antenne et un dispositif d'alimentation qui permettent d'émettre et de recevoir, dans un premier mode de fonctionnement, des ondes R.F. à polarisation circulaire et dans un second mode de fonctionnement, des ondes R.F. à polarisation linéaire. L'invention se rapporte également à un dispositif de communication mobile à main associé audit système à antenne. On alimente une structure rayonnante (10) comportant N éléments rayonnants hélicoïdaux (12A-D), disposés coaxialement suivant une même direction sur une structure de support (11), de façon à assurer l'émission et la réception d'ondes R.F. dans le premier mode de fonctionnement. N est un nombre entier supérieur ou égal à un. En outre, des organes (24A-D, 16, 17, 19, 25, 25A) sont disposés de manière à provoquer une excitation sensiblement uniforme des éléments rayonnants hélicoïdaux (12A-D) permettant d'assurer l'émission/réception d'ondes R.F. à polarisation linéaire dans le second mode de fonctionnement.

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