Capacitive loaded grid antenna
View Patent ↗A forty five degree polarized antenna having grid layers wrapped around a vertically polarized dipole, or grids wrapped internally or externally around a vertically polarized bicone antenna, and having grid segments separated by capacitors that can attenuate, remove or minimize circumferential resonances that appear due to the presence of the grids and reduce the nulling effects from reflections from the innermost grid layer.
1. A forty five degree polarized antenna comprising:
a bicone having a top conductive cone and a bottom conductive cone each of which have an identical conical radius R B and identical physical dimensions, wherein said top conductive cone and said bottom conductive cone are disposed in an oppositely directed stacked configuration along a vertical antenna axis, wherein the combined lengths of said top conductive cone and said bottom conductive cone equal a bicone height; and
at least one grid layer wrapped around the bicone, each said at least one grid layer comprising a plurality of grids, wherein each said plurality of grids further comprises a plurality of segments separated by plurality of capacitors.
2. The forty five degree polarized antenna of claim 1 , wherein each of said at least one grid layer has a grid height at least equal to the bicone height, and each said at least one grid layer is wrapped around the top conductive cone and bottom conductive cone outside of the bicone radius R B .
3. The forty five degree polarized antenna of claim 2 , wherein each said at least one layer is wrapped one circumferential length around the top conductive cone and bottom conductive cone in a cylindrical configuration.
4. The forty five degree polarized antenna of claim 1 , wherein each said at least one layer is wrapped around the top conductive cone and bottom conductive cone within the bicone radius.
5. The forty five degree polarized antenna of claim 4 , wherein each said at least one layer is wrapped one circumferential length around the top and bottom cones.
6. The forty five degree polarized antenna of claim 1 , wherein said at least one grid layer further comprises a fifteen degree grid layer, a thirty degree grid layer, and a forty five degree grid layer.
7. The forty five degree polarized antenna of claim 1 , wherein values of said plurality of capacitors ranges from 0.2 to 20000 picofarads.
8. A forty five degree polarized antenna comprising:
a dipole having a dipole height; and
at least one grid layer, each said at least one grid layer having a grid height at least equal to the dipole height, wherein each said at least one grid layer is wrapped around the dipole, each said at least one grid layer comprises a plurality of grids, wherein each of said plurality of grids further comprises a plurality of segments separated by a plurality of capacitors.
9. The forty five degree polarized antenna of claim 8 , wherein each said at least one grid layer is wrapped one circumferential length around the dipole in a cylindrical configuration.
10. The forty five degree polarized antenna of claim 8 , wherein said at least one grid layer further comprises a fifteen degree grid layer, a thirty degree grid layer, and a forty five degree grid layer.
11. The forty five degree polarized antenna of claim 8 , wherein values of said plurality of capacitors ranges from 0.2 to 20000 picofarads.
12. A method of eliminating or reducing grid circumferential resonances and their nulling effects and partially reducing nulling effects from reflections off of the innermost grid layer in a forty five degree polarized antenna having an antenna axis and an antenna height, the method comprising the steps of:
providing at least one grid layer, each said at least one grid layer comprising a plurality of grids, wherein each of said plurality of grids further comprises a plurality of segments separated by a plurality of capacitors; and
wrapping said at least one grid layer around a vertically polarized antenna centered on the antenna axis.
13. The method of claim 12 , wherein the vertically polarized antenna is a bicone antenna having two cones of equal bicone radius.
14. The method of claim 13 , wherein each said at least one grid layer has a grid height equal to or larger than a bicone height, and each said at least one grid layer is wrapped around the two cones outside of the bicone radius in a cylindrical configuration.
15. The method of claim 14 , wherein each said at least one grid layer is wrapped one circumferential length around the two cones in a cylindrical configuration.
16. The method of claim 13 , wherein each said at least one grid layer is wrapped around the two cones within the bicone radius.
17. The method of claim 16 , wherein each said at least one grid layer is wrapped one circumferential length around the two cones.
18. The method of claim 12 , wherein said at least one grid layer further comprises a fifteen degree grid layer, a thirty degree grid layer, and a forty five degree grid layer.
19. The method of claim 12 , wherein values of said plurality of capacitors ranges from 0.2 to 20000 picofarads.