A Frequency-Controlled Active Phased Array

Takahide Nishio, Hao Xin, Yuanxun Wang, Tatsuo Itoh

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


A frequency-controlled active phased array is introduced for cost-effective base-station applications. The array realizes simple LO-controlled beam steering with a fixed RF frequency, but without phase shifter components. Primary beam squint and pattern distortions, often seen in typical frequency-controlled phased arrays, are substantially reduced by the use of our heterodyne-mixing scheme and new feed network structures. The MMIC amplifiers provide more than 20 dB gain for a desired RF signal at 20 GHz, and effectively suppress the unwanted sideband and spurious LO by more than 40 dB. The K-band transmitter array demonstrates up to 40 degree beam-steering within 0.5 degree scan error and less than 1.3 dB gain error during scanning.

Original languageEnglish (US)
Pages (from-to)115-117
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number3
StatePublished - Mar 2004


  • Beam steering
  • Microwave communication
  • Phased arrays
  • Radar applications

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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