Quadrifilar tapered slot antenna
First Claim
Patent Images
1. An antenna for electromagnetic signals, comprising:
- a nonconductive cylindrical body having an outside surface;
a conductive coating on said outside surface of said body;
a plurality of slots in said coating extending in a helical pattern around said body, each slot having opposite ends with one end having a lesser width dimension across the slot than the opposite end; and
a feed line for each slot having a transverse portion extending across the slot and a longitudinal portion extending generally along and parallel thereto.
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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.
46 Citations
21 Claims
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1. An antenna for electromagnetic signals, comprising:
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a nonconductive cylindrical body having an outside surface; a conductive coating on said outside surface of said body; a plurality of slots in said coating extending in a helical pattern around said body, each slot having opposite ends with one end having a lesser width dimension across the slot than the opposite end; and a feed line for each slot having a transverse portion extending across the slot and a longitudinal portion extending generally along and parallel thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A cylindrical slot antenna, comprising:
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a nonconductive cylindrical body having opposite first and second ends and an outside surface; a conductive coating on said outside surface; a plurality of slots in said coating each having a narrow end adjacent said first end of said body and a wide end spaced from said second end of said body, each slot extending around said body in a helical pattern and having a greater width at said wide end than at said narrow end; and a feed line for each slot connected with an electric circuit, each feed line having a transverse portion extending across the corresponding slot and a longitudinal portion extending generally along and parallel thereto. - View Dependent Claims (18, 19)
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20. A cylindrical slot antenna, comprising:
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a hollow cylindrical body constructed of nonconductive material, said body having an outside surface and opposite first and second ends; a conductive coating on said outside surface; a plurality of slots in said coating extending in a helical pattern and each having a relatively narrow end and a relatively wide end, each slot having the narrow end thereof adjacent said first end of said body and progressively increasing in width from said narrow end toward said wide end; and a feed line for each slot connected with an electric circuit, each feed line having a transverse portion extending across the corresponding slot and a longitudinal portion extending generally along and parallel thereto. - View Dependent Claims (21)
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Specification