A Preliminary Study of Microwave Metamaterial Absorber Base on Cross-shaped for Stealth Technology

Absorber material is a good alternative for stealth application. It has a feature to prevent microwave reflections. A microwave metamaterial absorber base on cross-shaped is proposed on this work. The target of this work is to find optimal parameter cross-shaped unit cell design for high absorbance performance at microwave spectrum. The cross-shaped design was chosen due to its simple design and generating insensitive polarization. The peak of absorbance performance for 15 mm of width, 20 mm of width, 25 mm of width and 30 mm of width are 0.96 at 4.3 GHz, 0.86 at 3.9 GHz, 0.74 at 3.8 GHz, and 0.7 at 3.7 GHz, respectively. The highest peak of absorbance performance is cross-shaped with 15 mm of width. The microwave metamaterial absorber base on cross-shaped yields insensitive polarization performance. There is a perfect matching of absorbance performance with a difference of polarization angle. The microwave metamaterial absorber base on cross-shaped presents high absorbance performance for several incident angles case. At 4-4.7 GHz region, there is existed high absorbance performance for 20° - 80° incident angles (θ). Three absorbance peaks are existed for θ =20° at 4-4.7 GHz region. The θ= 40°, θ= 60°, and θ= 80° yield another absorbance peak at 3.4 – 3.8 GHz region. In this region, the high absorbance was yield only for θ= 80° case. Overall, the microwave metamaterial absorber base on cross-shaped is a good alternative for stealth application due to relative high absorbance performance and insensitive polarization.