In the embodiment of FIG. 9A, none of the components in the signal chain from receive antenna 122 to transmit antenna 126 are differentially coupled. On the other hand, in the embodiment of FIG. 9A, multiple components in the signal chain are differentially coupled. It should be appreciated the embodiments of FIGS. 9A and 9B are illustrative examples of ways in which components in the target device signal processing circuitry may be coupled, and that any suitable pairs of consecutive components in the signal processing chain from receive antenna 122 to transmit antenna 126 may be differentially coupled to one another. For example, in some embodiments, none, one, or more than one of the following pairs of components may be differentially coupled: receive antenna 122 and amplifier 918, amplifier 918 and frequency multiplier 922, frequency multiplier 922 and amplifier 926, amplifier 926 and transmit antenna 126. Additionally, to the extent the signal chain between receive antenna 122 and transmit antenna 126 includes one or more other components (e.g., one or more amplifiers and/or filters), none, one, or multiple of these components may be differentially coupled to other components in the signal chain.
