Antenna device comprising capacitively coupled radiating elements and a hand-held radio communication device for such antenna device
First Claim
1. 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.
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Accused Products
Abstract
The object of the present invention is to achieve an antenna for both receiving and transmitting circularly polarized RF signals which is smaller and lighter than prior art antennas as well as to achieve one antenna for both receiving and transmitting circularly polarized RF signals which has better characteristics for a given physical length than prior art antennas. This is achieved by providing an N-helical-filar antenna with N radiating elements coaxially arranged and defining a cylindrical envelope where each individual radiating element is capacitively coupled to another radiating element.
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Citations
18 Claims
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1. 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;
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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;
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said coupling means is a coupling disc arranged to carry at least one capacitor, said disc being securely fixed to said support and arranged to couple said at least one capacitor to at least two of said N radiating elements so as to constitute a capacitive coupling between said at least two radiating elements. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A mobile communication device comprising 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;
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said coupling means is a coupling disc arranged to carry at least one capacitor, said disc being securely fixed to said support and arranged to couple said at least one capacitor to at least two of said N radiating elements so as to constitute a capacitive coupling between said at least two radiating elements. - View Dependent Claims (17, 18)
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Specification