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 first septum polarizers;
a plurality of rows of second septum polarizers, wherein the plurality of rows of second septum polarizers are inverted with respect to the plurality of rows of first septum polarizers, and wherein the plurality of rows of first septum polarizers alternate with the plurality of rows of second septum polarizers;
a plurality of rows of first waveguides associated with a first polarization, wherein a first row of first waveguides of the plurality of rows of first waveguides is on a first side of a first row of first septum polarizers of the plurality of rows of first septum polarizers;
a plurality of rows of second waveguides associated with a second polarization, wherein a first row of second waveguides of the plurality of rows of second waveguides is on a second side of the first row of first septum polarizers; 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 a plurality of first waveguides within a same row of the plurality of 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 a plurality of second waveguides within a same row of the plurality of rows of second waveguides; and
a second waveguide feed stage coupled with the first intermediate waveguide and the second intermediate waveguide.
2. The waveguide device of claim 1 , wherein the second waveguide feed stage combines first intermediate waveguides associated with the same row of the plurality of rows of first waveguides and second intermediate waveguides associated with the same row of the plurality of rows of second waveguides.
3. The waveguide device of claim 1 , wherein the waveguide feed network further comprises:
a third waveguide feed stage coupled between the first intermediate waveguide associated with a first row of the plurality of rows of first waveguides and another first intermediate waveguide associated with a second row of the plurality of rows of first waveguides.
4. The waveguide device of claim 3 , wherein the waveguide feed network further comprises:
a fourth waveguide feed stage coupled between the second intermediate waveguide associated with a first row of the plurality of rows of second waveguides and another second intermediate waveguide associated with a second row of the plurality of rows of second waveguides.
5. The waveguide device of claim 1 , wherein:
a first waveguide combiner/divider of the first plurality of waveguide combiner/dividers is coupled with one or more first waveguides of a first row of the plurality of rows of first waveguides on a first side of a first row of the plurality of rows of first septum polarizers;
a second waveguide combiner/divider of the second plurality of waveguide combiner/dividers is coupled with one or more second waveguides of a first row of the plurality of rows of second waveguides on a second side of the first row of the plurality of rows of first septum polarizers and a first side of a first row of the plurality of rows of second septum polarizers; and
a third waveguide combiner/divider of the first plurality of waveguide combiner/dividers is coupled with one or more first waveguides of a second row of the plurality of rows of first waveguides on a second side of the first row of the plurality of rows of second septum polarizers.
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 and second feed networks comprise a plurality of 2-to-1 waveguide combiner/dividers.
8. 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.
9. 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.
10. The waveguide device of claim 1 , wherein the dual-polarized antenna array is a lattice antenna array.