PHASING OF A MICROSTRIP REFLECTARRAY USING MULTI-DIMENSIONAL SCALING OF ITS ELEMENTS

—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 two- dimensionally scaled square and circular rings offer much better phase responses than those observed for dipoles and patches.