Phasing of a Microstrip Reflectarray Using Multi-Dimensional Scaling of Its Elements

Abstract

Abstract-The paper reports on investigations into new schemes for dimensional scaling of the elements of a microstrip reflectarray to obtain a slower slope of the reflected wave phase characteristic. First, the phase response as a function of various shape elements is investigated when only one of their dimensions is varied. Next investigations concern the case when two dimensions or features of the element are scaled in a certain manner simultaneously. In the latter case, it is shown that phase responses of lower slopes with a minimal range reduction can be obtained. The feasibility of this concept is illustrated for dipoles, rectangular patches, and square and circular rings. Comparisons of the obtained results show that twodimensionally scaled square and circular rings offer much better phase responses than those observed for dipoles and patches.

Bandwidth Considerations for a Microstrip Reflectarray

“…However, none of these works address the question how the phase characteristics of the reflectarray elements should behave as function of frequency to achieve its wideband operation. With respect to microstrip reflectarrays utilizing variable size elements, the usual objective is to obtain the characteristic having a low gradient or slope as a function of the element's size at the design frequency [11]. The motivation behind this approach is that the slower slope will lead to an increased operational bandwidth of the phasing element and hence to the entire reflectarray.…”

A Novel Bandwidth Enhancement Technique for X-Band Rf Mems Actuated Reconfigurable Reflectarray

“…There are other methods that use single layer structures. In [44] double crossed loops, in [45] cross shaped array elements, and in [46,47] ring elements of variable size have been used on a single layer microstrip structure. The bandwidth enhancement of the MRAs is the most important problem of these antennas and is ongoing research concern.…”

Modified Phasing Element for Broadband Reflectarray Antennas

“…As a result, the manufacturing process becomes elaborate and expensive. In [8] Guo et al suggested to deploy double concentric ring elements with various grid spacings to achieve compromise linearity and phase range for different sub-wavelength grids ( Various schemes of scaling the inner radius as a function of outer radius are adopted for a singlelayer in [9], and the steep slope of reflection phase curve is reduced at the expense of reduction of the phase range compared with required 360 • . To overcome this problem, a single-layer double-concentric circular rings structure offering multi-resonance operation with an increased phasing range (of more than 360 • ) and low phasing slopes is investigated as viable alternatives to multilayer counterparts [10].…”