Analysis of dual-reflector antennas with a reflectarray as subreflector

Arrebola, Manuel and Haro Ariet, Leandro de and Encinar Garcinuño, José Antonio (2008). Analysis of dual-reflector antennas with a reflectarray as subreflector. "IEEE Electron Device Letters", v. 50 (n. 6); pp. 39-51. ISSN 1045-9243.


Title: Analysis of dual-reflector antennas with a reflectarray as subreflector
  • Arrebola, Manuel
  • Haro Ariet, Leandro de
  • Encinar Garcinuño, José Antonio
Item Type: Article
Título de Revista/Publicación: IEEE Electron Device Letters
Date: December 2008
Volume: 50
Freetext Keywords: Physical Optics technique antenna analysis dual-reflector antennas incident field radiation pattern rectangular periodic mesh reflectarray subreflector time-efficient fast Fourier transform
Faculty: E.T.S.I. Telecomunicación (UPM)
Department: Señales, Sistemas y Radiocomunicaciones
Creative Commons Licenses: Recognition - No derivative works - Non commercial

Full text

PDF - Requires a PDF viewer, such as GSview, Xpdf or Adobe Acrobat Reader
Download (1MB) | Preview


In this paper, a modular technique is described for the analysis of dual-reflector antennas using a reflectarray as a subreflector. An antenna configuration based on a sub-reflectarray and a parabolic main reflector provides better bandwidth than a single reflectarray, and has a number of advantages compared with a conventional dual-reflector antenna. Examples include the possibility of beam shaping by adjusting the phase on the sub-reflectarray, and potential capabilities to scan or reconfigure the beam. The modular technique implemented for the antenna analysis combines different methods for the analysis of each part of the antenna. First, the real field generated by the horn is considered as the incident field on each reflectarray element. Second, the reflectarray is analyzed with the same technique as for a single reflectarray, i.e., considering local periodicity and the real angle of incidence of the wave coming from the feed for each periodic cell. Third, the main reflector is analyzed using the Physical Optics (PO) technique, where the current on the reflector surface is calculated by summing the radiation from all the reflectarray elements. Finally, the field is calculated on a rectangular periodic mesh at a projected aperture, and then a time-efficient fast Fourier transform (FFT) algorithm is used to compute the radiation pattern of the antenna. The last step significantly improves the computational efficiency. However, it introduces a phase error, which reduces the accuracy of the radiation patterns for radiation angles far away from the antenna's axis. The phase errors have been evaluated for two integration apertures. It has been demonstrated that accurate patterns are obtained in an angular range of plusmn6deg, which is sufficient for large reflectors. The method of analysis has been validated by comparing the results with simulations obtained from GRASP8. Finally, the theoretical beam-scanning performance of the antenna is analyzed.

More information

Item ID: 2039
DC Identifier:
OAI Identifier:
Deposited by: Memoria Investigacion
Deposited on: 04 Jan 2010 11:02
Last Modified: 20 Apr 2016 11:50
  • Open Access
  • Open Access
  • Sherpa-Romeo
    Check whether the anglo-saxon journal in which you have published an article allows you to also publish it under open access.
  • Dulcinea
    Check whether the spanish journal in which you have published an article allows you to also publish it under open access.
  • Recolecta
  • e-ciencia
  • Observatorio I+D+i UPM
  • OpenCourseWare UPM