Chip-scale radio-frequency localization devices and associated systems and methods
摘要
說(shuō)明書(shū)
As discussed above, the inventors have recognized that harmonic coupling between the transmit antenna and the receive antenna on an interrogator device may degrade its performance. In some embodiments, for example, an interrogator may be configured to transmit, to a target device, RF signals having a first center frequency, and receive, from the target device, RF signals having a second center frequency that is a harmonic of the first center frequency. While generating RF signals having a first center frequency, the interrogator may also generate nuisance RF signals having the second center frequency, for example, because of non-linear circuitry components in the signal generation and transmission chain (e.g., amplifiers, frequency multipliers, etc.). These nuisance RF signals may be detected by the interrogator's receive antenna (when this occurs the transmit and receive antennas may be said to be harmonically coupled) and interfere with the ability of the interrogator's receive antenna to detect RF signals transmitted by the target device. As a result, the interrogator may not be able to detect RF signals emitted by the target device unless the target device is physically close to the interrogator (e.g., within 3 meters or less). Consequently, reducing harmonic coupling may facilitate detecting RF signals from a target device at greater distances (e.g., 20-40 meters). Reducing harmonic coupling on the transmit and receive antennas of a target device may also improve the performance of the overall system.
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