Waveguide feed network architecture for wideband, low profile, dual polarized planar horn array antennas
A waveguide structure for a compact and scalable dual-polarized antenna array. In one example, a waveguide device comprises septum polarizers dividing common waveguides into first waveguides associated with a first polarization and second waveguides associated with a second polarization. The sets of septum polarizers may be inverted relative to each other to form first groups of four adjacent first waveguides for each type of waveguide. The waveguide device may also include a waveguide feed network including a first waveguide feed stage including waveguide combiner/dividers coupled between the four adjacent waveguides intermediate waveguides. The waveguide device may further include a second waveguide feed stage coupled with the first intermediate waveguides and the second intermediate waveguides, wherein the second waveguide feed stage extends in a direction perpendicular to the first waveguide feed stage.
1. A waveguide device for a dual-polarized antenna array comprising:
a plurality of rows of common waveguides coupled with alternating pairs of adjacent rows of first waveguides associated with a first polarization and pairs of adjacent rows of second waveguides associated with a second polarization; and
a waveguide feed network comprising:
a first waveguide feed stage comprising:
a first plurality of waveguide combiner/dividers, each of the first plurality of waveguide combiner/dividers coupled between a first intermediate waveguide and first waveguides of a first pair of adjacent rows of first waveguides, wherein the first pair of adjacent rows of first waveguides has no intervening row of second waveguides; and
a second plurality of waveguide combiner/dividers, each of the second plurality of waveguide combiner/dividers coupled between a second intermediate waveguide and second waveguides of a second pair of adjacent rows of second waveguides, wherein the second pair of adjacent rows of second waveguides has no intervening row of first waveguides; and
a second waveguide feed stage coupled with the first intermediate waveguides and the second intermediate waveguides.
2. The waveguide device of claim 1 , wherein:
two or more first waveguides from the first pair of adjacent rows of first waveguides are formed from first waveguides coupled with a first group of common waveguides from adjacent rows of common waveguides; and
two or more second waveguides from the second pair of adjacent rows of second waveguides are formed from second waveguides coupled with a second group of common waveguides from adjacent rows of common waveguides, wherein the first group of common waveguides is different from the second group of common waveguides.
3. The waveguide device of claim 2 , wherein the first group of common waveguides are formed from adjacent columns of common waveguides, and wherein the second group of common waveguides are formed from the adjacent columns.
4. The waveguide device of claim 2 , wherein the first group of common waveguides includes at least a first common waveguide that is included in the second group of common waveguides and a least a second common waveguide that is not included in the second group of common waveguides.
5. The waveguide device of claim 2 , wherein the first group of common waveguides comprises common waveguides from two adjacent rows of common waveguides and two adjacent columns of common waveguides.
6. The waveguide device of claim 1 , wherein the second waveguide feed stage comprises:
a first feed network coupled with the first intermediate waveguides; and
a second feed network coupled with the second intermediate waveguides.
7. The waveguide device of claim 1 , wherein the first polarization is a right-handed circular polarization and the second polarization is a left-handed circular polarization.
8. The waveguide device of claim 1 , wherein the first polarization is a first linear polarization and the second polarization is a second linear polarization orthogonal to the first linear polarization.
9. The waveguide device of claim 1 , wherein each common waveguide is located a same inter-element distance from at least two adjacent common waveguides.
10. The waveguide device of claim 1 , wherein each common waveguide is divided into the first waveguide associated with the first polarization and the second waveguide associated with the second polarization by a septum polarizer.
11. The waveguide device of claim 10 , wherein:
the dual-polarized antenna array is a lattice antenna array;
a first row of the dual-polarized antenna array has common waveguides each having a septum polarizer in a first orientation; and
a second, adjacent row of the dual-polarized antenna array has common waveguides each having a septum polarizer in a second orientation, wherein the second orientation is opposite the first orientation.
12. The waveguide device of claim 10 , wherein each of the plurality of rows of common waveguides have septum polarizers inverted by rotation around a longitudinal axis relative to septum polarizers in an adjacent row of the plurality of rows of common waveguides.
13. The waveguide device of claim 1 , wherein there are no second waveguides located between the first waveguides of the first pair of adjacent rows of first waveguides, and wherein there are no first waveguides located between the second waveguides of the second pair of adjacent rows of second waveguides.
14. The waveguide device of claim 1 , wherein a row of common waveguides is coupled with a row of the first waveguides associated with the first polarization and a row of the second waveguides associated with the second polarization.
15. A waveguide device for a dual-polarized antenna array comprising:
a plurality of rows of common waveguides coupled with alternating pairs of adjacent rows of first waveguides associated with a first polarization and pairs of adjacent rows of second waveguides associated with a second polarization; and
a waveguide feed network comprising:
a first waveguide feed stage comprising:
a first plurality of waveguide combiner/dividers, each of the first plurality of waveguide combiner/dividers coupled between a first intermediate waveguide and first waveguides of a first pair of adjacent rows of first waveguides; and
a second plurality of waveguide combiner/dividers, each of the second plurality of waveguide combiner/dividers coupled between a second intermediate waveguide and second waveguides of a second pair of adjacent rows of second waveguides; and
a second waveguide feed stage coupled with the first intermediate waveguides and the second intermediate waveguides, wherein the second waveguide feed stage comprises:
a first feed network coupled with the first intermediate waveguides, the first feed network comprising a third plurality of waveguide combiner/dividers coupled between the first intermediate waveguides and a first feed network port of the waveguide feed network; and
a second feed network coupled with the second intermediate waveguides, the second feed network comprising a fourth plurality of waveguide combiner/dividers coupled between the second intermediate waveguides and a second feed network port of the waveguide feed network.
16. The waveguide device of claim 15 , further comprising:
a third feed network comprising a fifth plurality of waveguide combiner/dividers coupled with the first feed network port of the waveguide feed network and coupled with at least one other waveguide feed network associated with the second plurality of waveguide combiner/dividers; and
a fourth feed network comprising a sixth plurality of waveguide combiner/dividers coupled with the second feed network port of the waveguide feed network and coupled with the at least one other waveguide feed network associated with the second plurality of waveguide combiner/dividers.
17. The waveguide device of claim 15 , wherein at least a portion of the first feed network is located between the first intermediate waveguides and the second feed network.
18. The waveguide device of claim 15 , wherein the first and second feed networks comprise a plurality of 2-to-1 waveguide combiner/dividers.
19. A waveguide device for a dual-polarized antenna array comprising:
a plurality of rows of common waveguides coupled with alternating pairs of adjacent rows of first waveguides associated with a first polarization and pairs of adjacent rows of second waveguides associated with a second polarization;
a waveguide feed network comprising:
a first waveguide feed stage comprising:
a first plurality of waveguide combiner/dividers, each of the first plurality of waveguide combiner/dividers coupled between a first intermediate waveguide and first waveguides of a first pair of adjacent rows of first waveguides; and
a second plurality of waveguide combiner/dividers, each of the second plurality of waveguide combiner/dividers coupled between a second intermediate waveguide and second waveguides of a second pair of adjacent rows of second waveguides; and
a second waveguide feed stage coupled with the first intermediate waveguides and the second intermediate waveguides,
wherein:
a first row of first waveguides in the first pair of adjacent rows of first waveguides is coupled to a first row of common waveguides;
a second row of first waveguides in the first pair of adjacent rows of first waveguides is coupled to a second row of common waveguides;
a first row of second waveguides in the second pair of adjacent rows of second waveguides is coupled to the second row of common waveguides; and
a second row of second waveguides in the second pair of adjacent rows of second waveguides is coupled to a third row of common waveguides.