Dual-polarized wideband radiator with single-plane stripline feed
An antenna is provided from a plurality of antenna elements, each having a pair of orthogonally coupled notch elements coupled to an interleaved stripline-to-slot feed structure. Each dual-polarized, interleaved tapered slot antenna element forms a building block and a plurality of such tapered slot antenna elements can be arranged to form a phased array antenna having a triangular lattice pattern. The phased array antenna is capable of receiving electromagnetic signals having orthogonal polarization and includes a feed structure which provides interconnections on a single plane. The structure of the tapered slot antenna structure provides wideband, wide scan performance, for multiple polarizations without requiring electrical continuity between adjacent notch antenna elements.
1. An array antenna comprising:
a plurality of dual-polarized slot antenna elements, each of the plurality of dual-polarized slot antenna elements comprising:
a first element board having a radiating portion having one or more notch antenna elements disposed thereon and a having feed portion having a feed circuit disposed thereon and configured to provide signals to each of the one or more notch antenna elements disposed on the radiating portion of the first element board and having a slot provided in a first one of the radiating or feed portions of the first element board;
a second element board having a radiating portion having one or more notch antenna elements disposed thereon and a having feed portion having a feed circuit disposed thereon and configured to provide signals to each of the one or more notch antenna elements disposed on the radiating portion of the second element board and having a slot provided in a second one of the radiating or feed portions of the second element board with the slot of the first element board engaged with the slot of the second element such that the first and second element boards are interleaved and are orthogonally disposed; and
an upper ground block and a lower ground block coupled to the plurality of dual polarized slot antennas, wherein the upper ground block and the lower ground block provide a ground continuity for the antenna.
2. The antenna of claim 1 , wherein each of the feed circuits include a feed circuit output and wherein each of the outputs of the feed circuits of the first and second element boards are offset such that the feed circuit outputs for each of the plurality of dual-polarized slot antenna elements are disposed in a single plane.
3. The antenna of claim 1 , wherein:
the first element board comprises a pair of notch antenna elements disposed thereon; and
the feed circuit comprises:
a divider circuit having an input coupled to the feed circuit output and having a pair of outputs; and
a first coupler coupled between a first one of the divider circuit outputs and a first one of the pair of notch antenna elements; and
a second coupler coupled between a second one of the divider circuit outputs and a second one of the pair of notch antenna elements.
4. The antenna of claim 1 , wherein the radiator portion of the horizontal board element and the vertical board element include a first notch antenna element and a second notch antenna element.
5. The antenna of claim 4 , wherein each of the first notch antenna element and the second notch antenna element includes a first fin, a second fin and a throat region between the first fin and the second fin.
6. The antenna of claim 5 , wherein the horizontal board element includes a receiving slot in the radiator portion and disposed between the first fin and the second fin to accept the feed portion of the vertical board element.
7. The antenna of claim 5 , wherein the vertical board element includes a receiving slot in the feed portion to accept the radiator portion of the horizontal board element.
8. The antenna of claim 1 , further comprising one or more connectors coupled to the horizontal board element and the vertical board element, each of the connectors in the same plane.
9. The antenna of claim 1 , further comprising one or more rows of the plurality of dual-polarized slot antennas, wherein each row of the plurality of dual-polarized slot antennas are arranged in the interleaved stripline-to-slot feed structure with respect to an adjacent row.
10. The antenna of claim 9 , wherein the one or more rows of the plurality of dual-polarized slot antennas are arranged in a triangular lattice pattern.
11. The antenna of claim 1 wherein said upper ground block and said lower ground block sandwich said feed portions and provide a stripline feed network in two orthogonal directions of a plane connecting the upper ground block to the lower ground block.
12. An array antenna comprising:
a plurality or rows of dual-polarized slot antenna elements, each of the plurality of dual-polarized slot antenna elements comprising:
a first element board having a radiating portion having one or more notch antenna elements disposed thereon and a having feed portion having a feed circuit disposed thereon and configured to provide signals to each of the one or more notch antenna elements disposed on the radiating portion of the first element board and having a slot provided in a first one of the radiating or feed portions of the first element board;
a second element board having a radiating portion having one or more notch antenna elements disposed thereon and a having feed portion having a feed circuit disposed thereon and configured to provide signals to each of the one or more notch antenna elements disposed on the radiating portion of the second element board and having a slot provided in a second one of the radiating or feed portions of the second element board with the slot of the first element board engaged with the slot of the second element such that the first and second element boards are interleaved and are orthogonally disposed;
wherein each row of the plurality of rows of dual-polarized slot antennas are arranged in the interleaved stripline-to-slot feed structure with respect to an adjacent row; and
an upper round block and a lower ground block coupled to the plurality of dual polarized slot antennas, wherein the upper round block and the lower ground block provide a ground continuity for the antenna.
13. The antenna of claim 12 wherein the plurality of rows of dual-polarized slot antennas are arranged in a triangular lattice pattern.
14. The antenna of claim 12 , wherein each of the feed circuits include a feed circuit output and wherein each of the outputs of the feed circuits of the first and second element boards are offset such that the feed circuit outputs for each of the plurality of dual-polarized slot antenna elements are disposed in a single plane.
15. The antenna of claim 12 , wherein:
the first element board comprises a pair of notch antenna elements disposed thereon; and
the feed circuit comprises:
a divider circuit having an input coupled to the feed circuit output and having a pair of outputs; and
a first coupler coupled between a first one of the divider circuit outputs and a first one of the pair of notch antenna elements; and
a second coupler coupled between a second one of the divider circuit outputs and a second one of the pair of notch antenna elements.
16. The antenna of claim 12 , wherein the horizontal board element and the vertical board element in each of the dual-polarized slot antennas are orthogonally disposed with respect to each other.
17. The antenna of claim 12 , wherein the horizontal board element and the vertical board element include a radiator portion and a feed portion, and wherein the radiator portion of the horizontal board element and the vertical board element include a first notch antenna element and a second notch antenna element.
18. The antenna of claim 17 , wherein each of the first notch antenna element and the second notch antenna element includes a first fin, a second fin and a throat region between the first fin and the second fin.
19. The antenna of claim 18 , wherein the horizontal board element includes a receiving slot in the radiator portion and disposed between the first fin and the second fin to accept the feed portion of the vertical board element and wherein the vertical board element includes a receiving slot in the feed portion to accept the radiator portion of the horizontal board element.
20. The antenna of claim 12 wherein said upper ground block and said lower ground block sandwich said feed portions and provide a stripline feed network in two orthogonal directions of a plane connecting the upper ground block to the lower ground block.