Rotor-blade modulation on antenna amplitude pattern and polarization: Predictions and measurements

Craig R. Birtcher, Constantine Balanis, Dennis DeCarlo

Research output: Contribution to journalArticle

15 Scopus citations


The rotation of lift- and thrust-generating airfoils causes a periodic variation in aircraft communication signals. This effect is called rotor-blade modulation (RBM). The RBM on the radiation characteristics of helicopter-mounted antennas are predicted using the uniform theory of diffraction (UTD) and the finite-difference time-domain (FDTD) method and are compared with scale mode measurements and full-scale in-flight measurements. In addition, the effects of electric field polarization on RBM are studied using the FDTD.

Original languageEnglish (US)
Pages (from-to)384-393
Number of pages10
JournalIEEE Transactions on Electromagnetic Compatibility
Issue number4 PART 1
StatePublished - Dec 1 1999



  • Measurements
  • Predictions
  • Radiation patterns
  • Rotor blade modulation

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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