Chip Resistor Loaded Fractal Frequency Selective Surface Based Miniaturized Broadband Microwave Absorber from 2 to 18 GHz

Abstract

Fractal frequency selective surface (FFSS) based advanced electromagnetic (EM) structures play a significant role in microwave absorbing applications. The incorporation of chip resistors with FFSS further enhances the absorption characteristics. But the optimization of such chip resistor loaded FFSS geometry based on its shape, size, iteration level, resistance values, and substrate properties is very much required for an efficient microwave absorbing structure (MAS). Therefore, in this work, an effort has been made toward the design and analysis of a chip resistor loaded Minkowski loop FFSS based wideband MAS. The main aim of this work is to obtain –10 dB absorption bandwidth using FFSS based MAS in the range of 2–18 GHz. An optimal MAS is found to accomplish more extensive peak reflection coefficient (RC) value of –23.1 dB at a frequency of 12.2 GHz with a wide bandwidth of 11.1 GHz (5.5–16.6 GHz). The broadband absorption has mainly resulted from the strong EM resonance. The obtained result reflects the potential of lumped resistor loaded FFSS geometry based MASs for distinct practical EM applications.