Transmitting and receiving circuit for an apparatus for the automatic identification of objects and/or living organisms
US4556883A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 20, 1982 |
| Grant date | Dec 3, 1985 |
| Priority date | — |
| Expiry date | Dec 20, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01S13/825
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Transmitting and receiving circuit for an apparatus for the automatic identification of objects and/or living organisms, including a stationary interrogator and a transponder fastened to the object or living organism to be identified, the interrogator including an energy transmitter, a signal transmitter, a first directional coupler connected to the energy and signal transmitters for receiving outgoing waves from the transmitters and for decoupling a first energy component from the outgoing waves, a first transmitting and receiving antenna, a second directional coupler being connected in series with the first directional coupler and being connected to the first transmitting and receiving antenna for receiving returning waves from the transponder and for decoupling a second energy component from the returning waves, an adjustable attenuator connected to the first directional decoupler for receiving the first energy component, an adjustable phase shifter connected to the adjustable attenuator for receiving the first energy component, a third directional coupler having a first input connected to the adjustable phase shifter for receiving the first energy component, a second input conn…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.