Communications: radio wave antennas – Antennas – Slot type
Patent
1999-03-05
2000-07-11
Wong, Don
Communications: radio wave antennas
Antennas
Slot type
343767, 343895, H01Q 1310, H01Q 136
Patent
active
060880007
ABSTRACT:
A tapered slot quadrifilar antenna for GPS receivers. The antenna has a cylindrical dielectric body covered with a conductive coating. Four helical slots are formed in the antenna and extend around one half of its circumference to provide a right hand circular polarization for receiving GPS signals. A microstrip feed system is provided and is arranged to create balanced currents along both sides of each slot so that the impedance transformation is not adversely affected. Each slot has a narrow upper end and a wide lower end and a progressively greater width from the narrow end to the wide end.
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Garmin Corporation
Nguyen Hoang
Wong Don
LandOfFree
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