Microwave circulator
US4195296A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 1978 |
| Grant date | Mar 25, 1980 |
| Priority date | — |
| Expiry date | Mar 13, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01P1/387
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A signal detection device for a Doppler radar system comprising a circulator having an input, an antenna and a detector port. The signal at the detector port comprises the echo signal received at the antenna port and a small portion of the signal to be transmitted applied at the input port, the latter having a phase which varies transversely across the detector port. The detection device further includes a pair of detectors each connected to one of two points transversely spaced across the detector port for producing output signal of a frequency corresponding to the Doppler frequency and different phase. The phase difference between the two output signals is indicative of the approach or recession of a target with respect to the radar system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.