Phased array behavior of unilaterally coupled active antennas with varactor diodes

Minoru Sanagi, Tomomichi Kagawa, Shigeji Nogi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


A phased array behavior of a unilaterally coupled active antennas has been investigated. The active antenna is composed of a patch antenna and a parallel feedback type oscillator which can be coupled unilaterally to other oscillators without other nonreciprocal components. Numerical calculations of the reduced equations describing the behavior of the coupled oscillators array demonstrated that the phase differences between the oscillators can be varied up to about π/2 by giving the frequency changes from the injection locking frequency to the oscillators except of the first one. The oscillator mounted with the varactor diode for wide tuning range exhibited the property suitable for constructing the unilaterally coupled array. In the experiments at X-band, the electromagnetic wave radiated from the five element array was successfully scanned.

Original languageEnglish
Pages (from-to)192-198
Number of pages7
JournalIEICE Transactions on Electronics
Issue number2
Publication statusPublished - Feb 2003


  • Active antenna
  • Injection locking
  • Microwave
  • Phased array

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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