A Multichip Ka-Band Phased Array With a Scalable Self-Aligning Architecture

Ruixing He, Alireza Rouhafza, Yahya Tousi

Research output: Contribution to journalArticlepeer-review


We present a multichip scalable phased array based on nearest-neighbor phase self-alignment. The proposed scheme relies on mm-wave interferometric phase detection and baseband phase adjustment forming a distributed phase control scheme. We introduce the architecture and develop a proof of concept array where the chips are fabricated in the TSMC 65 nm process. We form the multichip array by implementing mm-wave chip-to-chip interconnects for phase control with an on-board antenna array. Over-the-air measured patterns produce reliable inter-element phase values resulting in calibration-free beam steering for up to 1\,\, {}\times {}7 radiating elements. The measured ±30° beam steering and steps across 27.4-32.4 GHz are consistent with predictions from simulation, demonstrating a novel distributed method to produce large-scale coherent beamforming arrays.

Original languageEnglish (US)
Pages (from-to)354-357
Number of pages4
JournalIEEE Microwave and Wireless Technology Letters
Issue number3
StatePublished - Mar 1 2024
Externally publishedYes

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  • Beam steering
  • multichip
  • phased arrays
  • scalable


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