By Topic

Effects of random phase errors at Kaband resulting from a composite material radome

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

1 Author(s)
Mayhan, Joseph T. ; Massachusetts Institute of Technology, Lexington, MA, USA

The effects of random phase errors introduced by way of a composite material radome on the sidelobes of a low-sidelobe transmitting antenna are investigated. The nominal sidelobe level of interest is - 40 dB below maximum directive gain outside a minimum conical angle about boresight. The radome used was constructed using strips of fiberglass cloth pre-impregnated with epoxy resin with each strip overlapping adjacent strips. The overlapping is staggered so that the final thickness contains roughtly the same number of layers. The shape of the radome is cylindrical on the side, capped by a hemispherical sector. The radome curvature is large with respect to wavelength, and is several wavelengths thick atK_{a}band (37 GHz). Measurements made on the radiation patterns of a large aperture low-sidelobe lens antenna enclosed by the radome indicate that the sidelobe degradation introduced by the radome can be directly related to the construction technique and materials used. Subsequent measurements on the insertion phase versus position on the radome support these conclusions. In particular, the correlation length of the random insertion phase introduced upon transmission through the radome was determined to be essentially that of the overlapping width used in the fiberglass layup. Furthermore, periodicities in insertion phase having the basic period of the overlap width cause grating lobes to occur in the radiation pattern, further degrading the sidelobes.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:24 ,  Issue: 3 )