Analysis of concentric split ring square reflectarray element for bandwidth enhancement

摘要

An analysis of phase variation and phase range of concentric split ringsquare element for broadband reflectarray antenna is presented in this paper. Thiselement is the combination of a single square element and a ring element where thesquare element is the modification of the conventional annular ring element whichinstead of using annul as the hole, this new idea presents a square as the hole in thering. This will varies the current distribution in the element which will then improvesthe performance of the bandwidth. The analysis and the design of this reflectarrayelement is presented based on variable size which operates at the first resonantfrequency of 13.44 GHz and at the second resonant frequency of 18.36 GHz. Thedesign procedure and critical parameters consist of phase range and phase slope (orvaribion) are also discussed. Modifying the current distribution of square ringelement, leads to a less steep phase variation and also enhancement on thebandwidth performance (up to 67.6%). The practical phase range is achievedthrough the use of RF35 as the substrate with the dielectric constant of 3.54 and thethicltness of 1.524 mm. CST Microstripes is used as the software tool to get thesimulation results.