Title :
Rotor-blade modulation on antenna amplitude pattern and polarization: predictions and measurements
Author :
Birtcher, Craig R. ; Balanis, Constantine A. ; DeCarlo, Dennis
Author_Institution :
Dept. of Electr. Eng., Arizona State Univ., Tempe, AZ, USA
fDate :
11/1/1999 12:00:00 AM
Abstract :
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 model measurements and full-scale in-flight measurements. In addition, the effects of electric field polarization on RBM are studied using the FDTD
Keywords :
aircraft antennas; aircraft communication; antenna radiation patterns; electromagnetic wave polarisation; finite difference time-domain analysis; geometrical theory of diffraction; helicopters; modulation; radiowave propagation; FDTD method; RBM; UTD; aircraft communication signals; antenna amplitude pattern; electric field polarization; finite-difference time-domain method; helicopter-mounted antennas; lift-generating airfoils; polarization; rotor-blade modulation; thrust-generating airfoils; uniform theory of diffraction; Aircraft; Amplitude modulation; Antenna measurements; Antenna theory; Automotive components; Finite difference methods; Physical theory of diffraction; Polarization; Predictive models; Time domain analysis;
Journal_Title :
Electromagnetic Compatibility, IEEE Transactions on
