Patent ID: 11936117
Assignee: SAAB AB
Field: Telecommunications (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. 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.