Patent ID: 6400339
Filing Date: 2002-06-04
Classification: H01Q

Abstract:
An antenna device for receiving and transmitting RF signals, comprising a support, N radiating elements, N feeding points arranged to feed RF signals to said N radiating elements where N is an integer greater than one, said N feeding points being arranged to be connectable to tranceiving circuitry, said N radiating elements being arranged to transmit RF signals in at least a first frequency band, said circuitry being arranged to feed RF signals to each feed point so that a circularly polarized RF signal is transmitted, each of said N radiating elements being coaxially arranged on said support in a substantially helical form so as to define a cylindrical envelope, at least one coupling means, is arranged to capacitively couple a first of said N radiating elements to at least a second of said N radiating element;each radiating element is capacitively coupled to both of its closest neighbors through at least one coupling portion; at least one of said coupling portions is conductively connected to said radiating element, said at least one of said coupling portion comprises at least one receiving member, said at least one of said coupling portion comprises at least one extending member, and said at least one extending member of a first radiating element of said N radiating elements is arranged to fit into said at least one receiving member of a second radiating element of said N radiating elements to achieve a capacitive coupling.