Download Reflectarray Antennas by John Huang PDF

By John Huang

Describes the configuration and ideas of a reflectarray antenna, its merits over different antennas, the background of its improvement, research ideas, sensible layout tactics, bandwidth matters and wideband suggestions, in addition to purposes and up to date advancements. either authors are good revered practitioners who've construct those antennas and constructed them for area flight.

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However, apart from possible mismatch between the patch and stub, there are other effects not included in the previous simplified analyses approach, that can distort the linear phase response. The first one is the specular reflection on the ground plane that will be added to the energy re-radiated by the patches. The second one is the resonances of the stubs that can happen for certain stub lengths. Both effects can be taken into account in a full-wave analysis of the reflective element [17]. The phase curves versus the stub length computed in [17, 18] for a linear array of 23 elements exhibit a nonlinear behavior produced by the aforementioned effects.

Then, the two components of the field reflected on each element must be computed using a full-wave analysis method. However, the real angles of incidence (q, j) for each element cannot be taken into account using design curves, simply because of the very large number of combinations. Therefore, an alternative method should be used for a more accurate analysis of each element in order to evaluate the cross-polarization generated by the reflectarray elements. When analyzing the reflectarray elements using a full-wave technique, it must be taken into account that the radiated field is the sum of two components: the field reradiated by the patches and the field reflected from the ground plane.

Gutierrez-Rios and J. Vassal’lo, “Technology Aspects of Fresnel Zone reflectors,” Chapter 4 in Advances on Antennas, Reflectors and Beam Control, edited by A. Tazon, Research Signpost, Kerala, India, 2005. 1 INTRODUCTION A printed reflectarray consists of a planar array of printed radiating elements that incorporates a certain phase-shift to produce a collimated or a shaped beam when it is illuminated by a feed (Fig. 1). The operating principle can be explained by considering the reflectarray in transmitting mode with a horn antenna located in a centered or offset position, and assuming that the reflectarray elements are in the far-field region of the horn.

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