Abstract
This communication presents a differential retrodirective array (RDA) for real-time tracking. The proposed differential RDA consists of three phase-conjugating chips and two circularly polarized antenna arrays. The phase-conjugating circuit chip which is in 0.18-um CMOS process, includes a differential low-noise amplifier, a double balanced mixer and a differential power amplifier. The specifically designed chip consumes 38.4 mW with a low voltage supply of 1.2 V. Experimental results of monostatic and bistatic cases show that, the RDA has a 3-dB beamwidth up to 77°. To the best knowledgement of the authors, the proposed RDA with circular polarization, which is promising for tracking free-moving targets, is the first differential RDA enabled by specifically designed low-cost CMOS chips.
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