Impedance helical antenna forming Π-shaped directional diagram
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United States of America Patent
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Sep 26, 2017
Issued Date -
N/A
app pub date -
Oct 7, 2014
filing date -
Oct 7, 2014
priority date (Note) -
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Abstract
A quadrifilar helix antenna includes a cylindrical support extending along an antenna axis; a plurality of spiral antenna elements wrapped helically on the cylindrical support and along the antenna axis from a feed end to a remote end; a ground plane having a diameter of about 300 mm and perpendicular to the antenna axis; and each of the antenna elements including a plurality of breaks, with the breaks having capacitors between conducting portions of the antenna elements. All capacitors a positioned higher than 60 mm above the ground plane, and capacitance value varies inversely with height. The antenna exhibits a DU(10°)=−20 dB or better at an operating frequency f0=1575 MHz. The diameter of the cylindrical support is 30 +/−5 mm. A total height of the cylindrical support is 300 +/−50 mm. A winding angle of the helix is variable.
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