Chip-scale radio-frequency localization devices and associated systems and methods
摘要
說明書
Another technique developed by the inventors for reducing the amount of harmonic coupling between the transmit and receive antennas involves using transmit and receive antennas that are polarized differently from one another. In addition to decreasing harmonic coupling, the manner in which the transmit and/or receive antennas are polarized may be used to effect of background clutter on the received RF signals. Accordingly, in some embodiments, an interrogator's transmit antenna may be configured to transmit RF signals having a first type of polarization and its receive antenna may be configured to receive RF signals having a second type of polarization that is different from the first type of polarization. In such embodiments, a target device may include a receive antenna configured to receive, from the interrogator, RF signals having the first type of polarization and a transmit antenna configured to transmit RF signals having the second type of polarization.
For example, in some embodiments, the transmit antenna on an interrogator may be configured to transmit, to a target device, RF signals circularly polarized in a first rotational direction and the receive antenna on the interrogator may be configured to receive, from the target device, RF signals circularly polarized in a second rotational direction different from the first rotational direction. Complementarily, the receive antenna on the target device may be configured to receive, from the interrogator, RF signals circularly polarized in the first rotational direction, and the transmit antenna on the target device may be configured to transmit RF signals circularly polarized in the second rotational direction.
