Analysis And Design Of Radome-Enclosed Antennas And Finite Arrays

Radome-enclosed antennas and finite arrays have found widespread applications inradar, communication and remote sensing. Some researches on analysis and designmethods of the radome-enclosed antennas and finite arrays are presented in thedissertation.The physical optics method is used to analysis the electromagnetic scattering fromelectric-large size radome-enclosed antennas. Under assumptions of locally planarradome surface and locally plane wave characteristic of waves scatter from antennas,formulations of equivalent electric and magnetic currents on radome surface and theinduced current on antenna surface are presented. Both monostatic and bistatic radarcross section (RCS) of a aperture antenna, a multilayered radome and theantenna-radome system are calculated. Frequency response of the monostatic RCSand the effect of antenna inclination on RCS are also discussed.The aperture distribution of an aperture antenna for difference pattern is formulatedas the product of that for sum pattern and a two-dimensional periodic windowfunction. A series representation for the spectrum of difference pattern is thenobtained according to the convolution theorem. The truncation error of the series hasbeen analyzed by introducing the coverage radius of the spectrum of sum pattern.Based on this representation, the plane wave spectrum-surface integration technique(PWS-SI) is extended to difference pattern calculation of radome-enclosed antennas.The bore-sight error (BSE) of a radome-enclosed antenna is calculated throughdifference pattern null searching. This method for BSE calculation is more stable andreliable than the beam maximum searching method used in PWS-SI before.A new spectral domain method for far fields computation of antennas with near zonescatterers such as lens and radomes is presented based on the characteristic that thefar fields of antennas locally depend on their angular spectra. The effective near field,which is introduced to replace the actual near field in the traditional PWS-SItechnique, is calculated efficiently by extracting effective spectral rays only. This...