Edge Truncation Effect Suppression of Phased Cavity-Backed Stacked Patch Array

A Conformal Phased Array with Low Profile and Wide-Scanning Performance for SAR Application

“…To illustrate the operating principle of the modifed cavity, Figure 5 shows the current and electric-feld distributions on the top surface of the upper patch and cavity walls of antennas 2 and 3, when scanning at 60 °in the Hplane at 1.7 GHz. According to the authors in reference [23], although the extended cavity walls are benefcial to E-plane scanning, strong coupling currents also arise on the cavity walls parallel to the Y-axis, as shown in Figure 5(a). Meanwhile, strong electric felds accumulate in the areas marked by black frames in Figure 5(c), indicating a relatively strong H-plane element coupling.…”

“…Tis negative coupling subsequently deteriorates the impedance matching when scanning in the H-plane. To address this problem, similar to that in [23], the parts of the cavity wall with strong coupling currents are cut, leading to the suppression of the negative strong electric felds, as shown in Figures 5(c) and 5(d). Terefore, a better impedance matching in the H-plane 60 °scanning case is achieved, as presented in Figure 4(b).…”