Communications: radio wave antennas – Antennas – With radio cabinet
Reexamination Certificate
2005-07-12
2005-07-12
Le, Hoanganh (Department: 2821)
Communications: radio wave antennas
Antennas
With radio cabinet
C343S876000, C455S277100, C455S101000
Reexamination Certificate
active
06917338
ABSTRACT:
The invention relates to an antenna diversity comprising a first and a second antenna element one of which is operated in an active mode whereas the other one of which is operated in a parasitic mode. It is the object of the present invention to further minimize the amount of mismatch by still being able to maximize a predetermined signal quality criterion for the electromagnetic signal on the active path between the active antenna and the transceiver. This object is solved by a switching unit120for either operating the first antenna element in the parasitic mode and simultaneously operating the second antenna element in the active mode or vice versa and by providing a pre-selection unit130as well as a selection unit140for selecting an optimal configuration for the antenna diversity ensuring that the amount of said mismatch is below a predetermined threshold value and that simultaneously a predetermined quality criterion for the transceived electromagnetic signal is fulfilled best. The antenna diversity further comprises a control unit150for adjusting said selected configuration. The invention further relates to a method for operating such an antenna diversity.
REFERENCES:
patent: 4752968 (1988-06-01), Lindenmeier et al.
patent: 6040803 (2000-03-01), Spall
patent: 6211830 (2001-04-01), Monma et al.
patent: 2002/0025793 (2002-02-01), Meijer et al.
Bergervoet Jozef Reinerus Maria
Dolmans Wilhelmus Mathias Clemens
Leyten Lukas
Koninklijke Philips Electronics , N.V.
Le Hoang-anh
Waxler Aaron
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