Antenna system for circularly polarized radio waves including antenna means and interface network
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United States of America Patent
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Nov 16, 1999
Grant Date -
N/A
app pub date -
Dec 30, 1998
filing date -
Dec 30, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An antenna system for a radio communication device, in particular a hand-portable telephone, having communication circuits and to be operating by circularly-polarized radio waves. In the system (1) there is provided a radiation means, preferably helical elements (2, 3, 4), a feeding network (8) having first coupling means (9) adapted for coupling to said communication circuits and second coupling means coupled to said helical elements (2, 3, 4). The interface means includes a closed resonator means (14), which has at least a first portion associated with said first coupling means (9), and having separated at least second (11), third (12) and fourth (13) portions forming said second coupling means (11, 12, 13).
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