Single and dual-band patch/helix antenna arrays
First Claim
Patent Images
1. A spatial null steering antenna array, comprising:
- a resonant quadrifilar helix antenna having a plurality of feed locations;
means for feeding the plurality of feed locations in phase quadrature to produce circular polarization in a resonant frequency band;
a ground plate coaxially aligned with and vertically displaced above the quadrifilar helix antenna;
a dielectric layer and an auxiliary patch resonant in the frequency band coaxially aligned and vertically stacked on the ground plate, the auxiliary patch having one or more feed pins;
means for feeding the one or more feed locations of the auxiliary patch in order to produce a combined circularly polarized radiation pattern minimum at selected elevation angles in the frequency band.
1 Assignment
0 Petitions
Accused Products
Abstract
Single and dual frequency band spatial null steering antenna arrays are disclosed, comprised of primary resonant quadrifilar helix antennas and auxiliary resonant patch antennas, which comprise stacked patches in the dual-band embodiments. Several feed networks are described for producing, preferably, circularly polarized radiation in satellite frequency bands (e.g., L1 and L2) with pattern nulls steerable to desired elevation angles. Various top and bottom-fed quadrifilar helix antennas configurations are also described.
20 Citations
51 Claims
-
1. A spatial null steering antenna array, comprising:
-
a resonant quadrifilar helix antenna having a plurality of feed locations;
means for feeding the plurality of feed locations in phase quadrature to produce circular polarization in a resonant frequency band;
a ground plate coaxially aligned with and vertically displaced above the quadrifilar helix antenna;
a dielectric layer and an auxiliary patch resonant in the frequency band coaxially aligned and vertically stacked on the ground plate, the auxiliary patch having one or more feed pins;
means for feeding the one or more feed locations of the auxiliary patch in order to produce a combined circularly polarized radiation pattern minimum at selected elevation angles in the frequency band. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
-
22. A dual-band spatial null steering antenna array, comprising:
-
a dual-band quadrifilar helix antenna resonant in a first frequency band and a second frequency band having a plurality of feed locations;
means for feeding the plurality of feed locations of the dual-band quadrifilar helix antenna to produce circular polarization in the first frequency band and the second frequency band;
a ground plate coaxially aligned with and vertically displaced above the dual-band quadrifilar helix antenna;
a first auxiliary patch resonant in the first frequency band and a second auxiliary patch resonant in the second frequency band coaxially aligned and vertically stacked on a dielectric substrate layer on top of the ground plate;
means for feeding the first patch and the second patch to produce combined circularly polarization pattern minima at selected elevation angles in the first and the second frequency bands. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51)
-
Specification