Wave-guide-notch antenna

• US 7,642,979 B2
• Filed: 08/18/2004
• Issued: 01/05/2010
• Est. Priority Date: 08/18/2004
• Status: Active Grant

• Current Assignee: Telefonaktiebolaget LM Ericsson
• Original Assignee: Telefonaktiebolaget LM Ericsson
• Inventors: Westerberg, Jessica, Hook, Anders, Johansson, Joakim
• Primary Examiner(s): Chen; Shih-Chao
• Application Number:
  US11/573,828
• Publication Number:
  US 20070296639A1
• Time in Patent Office: 1,966 Days
• Field of Search: 343/767, 343/770, 343/772, 343/768, 343/771
• US Class Current: 343/767
• CPC Class Codes: H01Q 13/0241 radiating a circularly polarised wave H01Q13/0258 takes precedence; polarisation converters H01Q15/244, in a waveguide H01P1/17
• CPC Class Codes: H01Q 13/0275 Ridged horns slot-line radiating ends H01Q13/085
• CPC Class Codes: H01Q 13/085 Slot-line radiating ends

Abstract

A dual polarized wave-guide notch antenna array is disclosed. The device comprises a feed section having at least two input transmission lines, a feed/wave-guide interface providing an aperture for transferring a radio frequency electromagnetic wave between the feed section and a wave-guide mode in a wave-guide section having ridges. The wave-guide section transfers energy between the feed/wave-guide interface and a tapered notch section, thereby gradually adjusting a created electromagnetic field towards free space conditions.

Claims

1. A dual polarized wave-guide notch microwave antenna array, comprising:

a feed section with at least two input transmission lines each connecting to a pair of feed elements,

wherein the feed section provides crossed slots or probes for transferring at least one wave signal into a wave-guide mode;

a wave-guide section;

a tapered notch section; and

a feed/wave-guide interface with a general aperture shape allowing energy transfer between the feed section and the wave-guide section, wherein the wave-guide section has ridges and transfers energy between the feed/wave-guide interface and the tapered notch section, wherein the tapered notch section gradually adjusts a ridged wave-guide electromagnetic field mode towards free-space conditions.

2. The antenna array according to claim 1, wherein the feed section comprises strip-line transmission lines feeding a crossed-slot feed/wave-guide interface aperture.

3. The antenna array according to claim 2, wherein the wave-guide section comprises adjoining wave-guide walls needing a self-supporting wave-guide grid.

4. The antenna array according to claim 2, wherein the wave-guide section comprises isolated wall segments which need to be assembled individually.

5. The antenna array according to claim 2, wherein the wave-guide section comprises no wave-guide walls at all.

6. The antenna array according to claim 2, wherein the geometry of the crossed-slot feed/wave-guide interface aperture and notches in the tapered notch section are adjusted to a shape matching an expected notch-supported field.

7. The antenna array according to claim 1, wherein the feed section comprises longitudinal probes feeding a general feed/wave-guide interface aperture, including crossed-slot apertures.

8. The antenna array according to claim 7, wherein the wave-guide section comprises adjoining wave-guide walls facilitating a self-supporting wave-guide grid.

9. The antenna array according to claim 7, wherein the wave-guide section comprises isolated wall segments which need to be assembled individually.

10. The antenna array according to claim 7, wherein the wave-guide section comprises no wave-guide walls at all.

11. The antenna array according to claim 1, wherein the feed section comprises at least one hybrid which outputs microwave signals being either in phase or in quadrature.

12. The antenna array according to claim 1, wherein footprints of the ridges of the wave-guide section are chosen equal to the footprints of crossed-slots.