Chip-scale radio-frequency localization devices and associated systems and methods
摘要
說明書
Next, process 1600 proceeds to act 1606, where a transmit antenna on the target device transmits, to the interrogator, a third RF signal circularly polarized in a second rotational direction different from (e.g., opposite of) the first rotational direction. For example, when the receive antenna on the target device is configured to receive RHCP RF signals, the transmit antenna on the target device is configured to transmit LHCP RF signals or vice versa.
In some embodiment, the target device may generate the third RF signal based on the second RF signal. For example, after receiving the second RF signal polarized in the first rotational direction (e.g., clockwise direction) at act 1604, the target device may process the second RF signal (e.g., by passing it through one or more amplifiers, one or more frequency multipliers, mixing the second RF signal with one or more other RF signals, and/or performing any of the processing described herein with respect to any target device), and provide the processed second RF signal to the transmit antenna which is configured to transmit RF signals polarized in the second rotational direction (e.g., counter-clockwise direction). In this way, the transmit antenna on the target device is driven by the processed second RF signal to transmit a third RF signal polarized in the second rotational direction.
The target device transmit antenna may be any suitable type of antenna configured to transmit circularly polarized signals. It may be directional or isotropic. The transmit 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).
