As described with reference to FIGS. 9A-9H and 10, a target device may be configured to receive RF signals having a first center frequency (e.g., 5 GHz or 60 GHz) and transmit RF signals having a second center frequency that is a harmonic of the first center frequency (e.g., 10 GHz or 120 GHz). It should be appreciated, however, that a target device is not limited to transmitting RF signals at a single harmonic of the center frequency of the RF signals it receives. For example, in some embodiments, a target device may be configured to receive RF signals having a first center frequency (e.g., 5 GHz or 60 GHz) and transmit: (1) RF signals having a second center frequency (e.g., 10 GHz or 120 GHz) that is a harmonic of the first center frequency; and (2) RF signals having a third center frequency (e.g., 15 GHz or 180 GHz) that is a harmonic of the first center frequency and is different from the second frequency. In some embodiments, the target device may be further configured to transmit RF signals having center frequencies at other harmonic(s) of the first center frequency (e.g., 20 GHz or 240 GHz).
