| 摘要 |
A radio frequency (RF) object detector is disclosed. The RF object detector in example embodiments transmits an RF signal. A receiver measures the amplitude, the phase, or both the amplitude and phase of the signal as reflected from objects in an interrogation zone. The RF object detector can be deployed in a combined system that performs multiple functions. For example, the RF object detector can be integrated with an EAS system that also sends RFID commands and receives RFID responses. In some embodiments the object detector can discriminate between moving objects and stationary objects, and/or discriminate between objects in the interrogation zone and objects outside the interrogation zone, and/or provide location estimates. An antenna or antennas can be connected in a mono-static or bi-static configuration and the phase and/or amplitude signals can be either DC-coupled or AC-coupled into the system through a mixer. |
