Polarizer for two different frequency bands

US6150899A · kind A · utility

Assignee

• ALCATEL · FR

Inventors

• Udo Seewig · Langenhagen, DE
• Reimer Nagel · Feldkirchen-Westerham, DE
• Daniel Wojtkowiak · Neustadt, DE

Key dates

• Filing date: Aug 6, 1998
• Grant date: Nov 21, 2000
• Expiry date: Aug 6, 2018

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01P1/2131
• WIPO field: Telecommunications
• WIPO sector: Electrical engineering

Abstract

A polarizer for two different frequency bands for exciting an antenna with a parabolic reflector has a waveguide section capable of carrying in each frequency band two mutually perpendicularly linearly polarized waves. For each frequency band, there are connected to the waveguide section, separate from each other and mutually offset in the axial direction of the waveguide section, two waveguides having a rectangular cross-section. For the lower frequency band, for each polarization direction, a respective waveguide is connected directly to the waveguide section. For the higher frequency band, starting at a connecting point, each of the two waveguides is subdivided into two waveguide branches with identical rectangular cross-sections, with the branches terminating at two opposing locations of the waveguide section. The locations, where the branches for the two different polarization directions terminate on the waveguide section, are circumferentially offset relative to each other by 90.degree.. A metal pin is located in each of the flat waveguide branches in a respective aperture thereof.