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

Claim 11:
12. 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.