Reflection cancellation in multibeam antennas
US10411350B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 14, 2015 |
| Grant date | Sep 10, 2019 |
| Priority date | — |
| Expiry date | Nov 14, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/523
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A feed network for a multi-beam antenna is provided, including a first beam port, a second beam port, a beam-forming network coupled to the beam ports, and a cancellation circuit. The cancellation circuit is coupled to the first beam port and the second beam port before the beam-forming network. The cancellation circuit extracts a portion of a RF signal on the first beam port, adds phase delay, and injects the extracted, delayed signal from the first beam port onto the second beam port, and extracts a portion of a RF signal on the second beam port, adds phase shift, and injects the extracted, delayed signal from the second beam port onto the first beam port. In one example of the invention, the cancellation circuit comprises a first directional coupler on a first beam input path, a transmission line, a second directional coupler on the second beam input path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.