Dual-band multimode antenna feed
AssigneeSaab AB
InventorOla Forslund
Life of this patent
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Abstract
Provided is a dual-band multimode antenna feed for a high-frequency band and a low-frequency band. The feed includes four high-frequency waveguide ports, where each high-frequency waveguide port is connected to a respective high-frequency input/output waveguide. Each high-frequency input/output waveguide includes a high-frequency waveguide aperture facing a first section for mixing electromagnetic modes in the E-plane. The first section is connected to a second section for mixing electromagnetic modes in the H-plane. The feed further includes a low-frequency waveguide port connected to a low-frequency input/output waveguide. A filter is arranged inside the first section to be transparent for plane wave modes exhibited at lower frequencies and reflecting for plane wave modes exhibited at higher frequencies.
Claims15
A dual-band multimode antenna feed for a high-frequency band and a low-frequency band, the feed comprising four high-frequency waveguide ports, each high-frequency waveguide port being connected to a respective high-frequency input/output waveguide, each high-frequency input/output waveguide having a high-frequency waveguide aperture facing a first section for mixing electromagnetic modes in the E-plane, the first section being connected to a second section for mixing electromagnetic modes in the H-plane, wherein the feed further comprises a low-frequency waveguide port connected to a low-frequency input/output waveguide, wherein a low-frequency waveguide aperture faces the first section, and a filter is arranged inside the first section, the filter being arranged to be transparent for plane wave modes exhibited at lower frequencies and reflecting for plane wave modes exhibited at higher frequencies.
A method of providing an antenna feed, the method comprises:
- providing four high-frequency waveguide ports, each high-frequency waveguide port being connected to a respective high-frequency input/output waveguide,
- providing each high-frequency input/output waveguide with a high-frequency waveguide aperture facing a first section for mixing electromagnetic modes in the E-plane,
- providing a second section for mixing electromagnetic modes in the H-plane being connected to the first section, that wherein the method further comprises:
- providing a low-frequency waveguide port connected to a low-frequency input/output waveguide,
- providing a low-frequency waveguide aperture facing the first section,
- arranging a filter inside the first section, where the filter is arranged to be transparent for plane wave modes exhibited at lower frequencies and reflecting for plane wave modes exhibited at higher frequencies.
Dependencies are inferred from the claim text.