Polarization Mode Independent Triple Band Microwave Signal Absorber

In this study a new triple band microwave signal absorber is designed. This proposed structure consists of three nested ring resonators. In the outer ring, there are eight rotationally conductive arms that are symmetrically located in the x-y plane and placed at an angle of 45° to each other to provide polarization independence and wide angle absorption. On the inside, there are two nested ring resonators which are decrease inwardly by ？ radius rate to each other. Initially, absorption curve of the outermost eight-arm ring resonator is plotted and a single absorption peak of 0.87 at 4.8 GHz is observed. Then, when two separate ring resonators were added to the structure, the absorption frequency shifted slightly to 4.7 GHz while the absorption rate increased by 10% to 0.96. In addition, two separate absorption peaks are observed at the 2.4 GHz and 12.6 GHz frequencies, respectively, at 0.92 and 0.94 rates. Finally, three absorption peak values have been shown to be caused by three nested ring resonators in the structure and also owing to the eight rotational symmetric arm, the structure is polarization mode independent and has an incident wave angle stability of up to 50°