J4 ›› 2014, Vol. 41 ›› Issue (6): 188-194.doi: 10.3969/j.issn.1001-2400.2014.06.031

• Original Articles • Previous Articles     Next Articles

Effect of surface errors on the average power pattern  of reflector antennas

WANG Meng;DUAN Baoyan;WANG Wei   

  1.  (Ministry of Education Key Lab. of Electronic Equipment Structure, Xidian Univ., Xi'an  710071, China)
  • Received:2013-12-25 Online:2014-12-20 Published:2015-01-19
  • Contact: WANG Meng E-mail:lemonwm@163.com

Abstract:

The method for evaluating the average power pattern of reflector antennas is proposed when they are subjected to random errors and systematic errors. Firstly, the average expression for the random phase error of the aperture field is derived by analyzing the manufacturing errors of the single panel and misaligned errors of panel frames. Subsequently, the closed-form expression for the tapered illumination correlation function is derived by incorporating the axial defocus of the feed caused by systematic deformation. Then a novel mathematical model is developed to evaluate the average power pattern efficiently caused by the random error and systematic error. Finally, detailed parametric simulations are performed based on a reflector antenna with a 65m diameter to investigate the overall effect of the random error and systematic error on the performance, and reference advices are given finally.

Key words: reflector antennas, random errors, systematic errors, correlation interval, average power pattern