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Experimental study demonstrates high-efficiency free-space power combining in silicon BiCMOS amplifier arrays, indicating viable millimeter-wave wafer-scale phased array transmitters.
This paper presents the first millimeter-wave wafer-scale power-amplifier array implemented in a 0.13-μ m BiCMOS technology. The power combining is done in the free-space using high efficiency on-chip antennas. A 3 × 3 power-amplifier array is demonstrated with an equivalent isotropic radiated power of 33-35 dBm at 90-98 GHz. This results in a total on-chip power of 21-23 dBm and a total radiated power of 17.5-19.5 dBm. The measured patterns of the array show single-mode operation and ~100% free-space power-combining efficiency with a 3-dB beamwidth of 28° and a directivity of 15.5 dB (gain of 12 dB). The total power-combining efficiency including the antenna losses is 45±10%. The application areas are in millimeter-wave transmitters and wafer-scale phased arrays.
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Atesal et al. (2011) studied this question.
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