Right and left hand circularly polarized RFID backscatter antenna
US6255993A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 8, 1999 |
| Grant date | Jul 3, 2001 |
| Priority date | — |
| Expiry date | Jul 8, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q1/38
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An antenna, system and method for transmitting and receiving RF signals over a first frequency band using a single antenna or two closely spaced antennas. In one embodiment, the antenna is configured to receive first signals in the first frequency band having a first rotational polarization and to transmit second signals in the first frequency band and having a second rotational polarization. The second signals may be transmitted in response to the first signals. The first signals may be preferentially routed to a receiver using signal conditioning circuitry that also routes the second signals from a transmitter to the antenna but not to the receiver.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.