Method and an apparatus for passive interference cancellation
US6771931B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 18, 2001 |
| Grant date | Aug 3, 2004 |
| Priority date | — |
| Expiry date | Dec 31, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/12
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A method and an apparatus for passive interference cancellation are provided. The apparatus includes a first and second radio operating on a same frequency band, a first and second coupler, and a first phase shifter. The first radio includes a first radio transceiver and a first radio antennae. The second radio includes a second radio antennae located a predetermined distance from the first radio antennae. A first coupler and second coupler are adjusted according to a coupling loss between the antennas. The first radio transceiver transmits a first signal. The first signal is divided by the first coupler to a first portion and a second portion. The first portion moves through the first radio antennae and is received by the second radio antennae. The second portion moves through the first phase shifter. Both portions of the first signal meet and cancel to achieve a specified isolation between the radios.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.