A Miniaturized Frequency Selective Rasorber Based on Meanderline and Square Slot Structure

In this paper, a frequency selective rasorber (FSR) for getting two wide transmission windows in between the absorption windows is proposed. The proposed structure consists of a meanderline type structure surrounded by square ring and a cross dipole in the top layer and square slot in bottom layer. The FSR exhibits two transmission bands at 5.5 GHz and 7.65 GHz having bandwidth of 288 MHz and 475 MHz respectively, while the absorption windows are at 2.8 GHz and 9.45 GHz with absorptivity of 94.5% and 91% respectively. The novelty of the structure is its compactness, design, wide angle polarization insensitivity and angular stability for all the transmission and absorption bands. The surface current distributions in absorption and transmission windows have been plotted. The structure shows the angular stability upto 75° in both Transverse Electric and Transverse Magnetic mode of polarization. Keywords-absorption, FSR, meanderline, polarization