Chip-scale radio-frequency localization devices and associated systems and methods
摘要
說明書
In addition to or instead of using a frequency-selective surface, in some embodiments, the substrate 505 may be coated with an absorbent coating configured to reduce harmonic coupling between the transmit antenna 502 and the receive antenna 506. The absorbent coating may be configured to absorb any incident microwaves and dissipate them as heat energy. Any suitable absorbent coating may be used. For example, the absorbent coating may comprise carbon material such as, for example, resistive card or sheet stock material or carbon impregnated foam.
In some embodiments, each of differential feed circular polarized antennas 502 and 506 may be fabricated on the substrate 505. For example, substrate 505 may comprise one or more conductive layers and each of antennas 502 and 506 may be fabricated on the substrate 502 at least in part by patterning the conductive layer(s). Each of antennas 502 and 506 may be a planar spiral antenna, a patch antenna (e.g., a truncated patch antenna as shown in
In some embodiments, the antennas 502 and 506 may be directional antennas having a higher power aperture than isotropic antennas, which may allow the antennas to focus the transmission and/or receipt of RF signals to/from a particular direction (e.g., in a direction where one or more target devices of interest may be located). In some embodiments, however, one or both of antennas 502 and 506 may be isotropic antennas, as aspects of the technology described herein are not limited in this respect.
