Garmin Corporation

Other

Chien H Ho

Paul K Shumaker

A quadrifilar crank slot antenna for GPS receivers. The antenna has a cylindrical dielectric body covered with a conductive coating. Four crank shaped slots are formed in a helical pattern 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.

Crank quadrifilar slot antenna

A hexafilar slot antenna for GPS receivers. The antenna has a cylindrical dielectric body covered with a conductive coating. Six 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.

Hexafilar slot antenna

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.

Quadrifilar tapered slot antenna

A microstrip-fed cylindrical slot antenna is provided for allowing better communication between an object and a satellite. The microstrip-fed cylindrical slot antenna comprises a cylindrical base member; a first conductive coating disposed on the cylindrical base member; at least one slot disposed in the conductive coating, the slot having a helical configuration about the cylindrical base member; and a feed line corresponding to each of the slots, the feed line crossing each respective slot and extending beyond the slot by a distance D.

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San Diego, CA, United States of America

Chien H Ho