Chip-scale radio-frequency localization devices and associated systems and methods
摘要
說明書
Next, process 1600 proceeds to act 1608, where a receive antenna on the interrogator receives a fourth RF signal circularly polarized in the second rotational direction. The fourth RF signal received by the interrogator at act 1608 may correspond to (e.g., may be the received version of) the third RF signal transmitted by the target device at act 1606. For example, when the transmit antenna on the target device transmits a third RHCP RF signal at act 1606, the receive antenna on the interrogator may receive a corresponding fourth RHCP RF signal at act 1608. As another example, when the transmit antenna on the target device transmits a third LHCP RF signal at act 1606, the receive antenna on the target device may receive a corresponding fourth LHCP RF signal at act 1608. Although the third and fourth RF signals may be the same, they need not be, at least because the third RF signal may be altered (e.g., the amplitude, phase, and/or frequency of the third RF signal may be altered) as it propagates from the target device to the interrogator.
The interrogator receive antenna may be any suitable type of antenna configured to receive circularly polarized signals. The receive antenna may be directional or isotropic. The receive antenna may be a circularly polarized antenna fabricated on a substrate (e.g., a patch antenna, a planar spiral antenna, an antenna comprising a first linearly polarized antenna and a second linearly polarized antenna disposed orthogonally to the first linearly polarized antenna).
