Design of the absorber screen based on the modified bow-tie patch periodical array

A single layer absorber screen is proposed in this paper, which has the much thinner depth and wider band compared with Salisbury screen. The absorber is composed of metallic periodical arrays and the lumped resistors on the substrate. In the periodical unit, the size is reduced intentionally to avoid the reflection of high Floquent´s modes. However, this reduction is disadvantageous to the resonant of metallic patches at the lower frequency. Then, the capacitive loading technique in antenna engineering is extended to the design for absorber, and at the same time, the bow-tie patches are adopted here to increase the bandwidth. To obtain the wider bandwidth, the modified bow-tie patches with different size are designed in one unit to make the absorber resonant at multiple frequencies. Finally, the simulation result shows that the absorber screen proposed in this paper has an 86% wide band for -10dB power reflection and the depth of absorber is nearly 1/8 of the wavelength at the center frequency in free space.