It should be appreciated that the embodiment illustrated in FIG. 9A is illustrative and that there are variations. For example, although in the illustrated embodiment a single amplifier 904 is shown between receive antenna 122 and frequency multiplier 908, in other embodiments there may be zero, two, three, four, five or more amplifiers between receive antenna 122 and frequency multiplier 908. As another example, although in the illustrated embodiment, a single amplifier 912 is shown between frequency multiplier 908 and transmit antenna 126, in other embodiments there may be zero, two, three, four, five or more amplifiers between frequency multiplier 908 and transmit antenna 126. In some embodiments, the number and gain of the amplifiers in the signal chain from receive antenna 122 to transmit antenna 126 may be determined based on an overall amount of gain desired to induce to the signal and in view of an amount of loss induced by the frequency multiplier 908. For example, in some embodiments, a frequency multiplier (e.g., multiplier 908) may induce a 6 dB-12 dB loss to the power of the signals, and one or multiple amplifiers (e.g., amplifiers 904 and 912) that provide at least 30 dB of gain overall may be introduced into the signal chain between receive antenna 122 and transmit antenna 126.
