Impedance helical antenna forming Π-shaped directional diagram
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 26, 2017
Issued Date -
N/A
app pub date -
Oct 7, 2014
filing date -
Oct 7, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
First Claim
Other Claims data not available
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 2 Citation Count
- H01Q Class
- 13.07 % this patent is cited more than
- 8 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Mar 26, 2025 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Mar 26, 2029 |
