As shown in FIG. 11B, the receive circuitry of interrogator 1170 includes a first receive chain including frequency multipliers 1179-1 and 1183-1, amplifiers 1177-1 and 1180-1, and frequency mixers 1178-1 and 1182-1, which receive chain is used for phase-coherent processing of RF signals received by antenna 1176-1. The receive circuitry of interrogator 1170 further includes a second receive chain including frequency multipliers 1179-2 and 1183-2, amplifiers 1177-2 and 1180-2, and frequency mixers 1178-2 and 1182-2, which receive chain is used for phase-coherent processing of RF signals received by antenna 1176-2. The receive circuitry of interrogator 1170 further includes an nth receive chain including frequency multipliers 1179-n and 1183-n, amplifiers 1177-n and 1180-n, and frequency mixers 1178-n and 1182-n, which receive chain is used for phase-coherent processing of RF signals received by antenna 1176-n.
