Anechoic characteristics of a metal backed anechoic agro-waste for EMC applications

Electromagnetic Interference (EMI) is a serious threat to the modern unprotected microelectronics-based integrated systems. Various techniques are implemented, to protect the mission critical and sensitive systems, against the EMI threats. One of the most important techniques is the use of absorbing material to suppress the EMI at the sources and/or receptors to ensure their Electromagnetic compatibility (EMC). Rice husk is an agro-waste and had been identified, as a naturally available cheaper anechoic material, in recent years. Some of the investigations, based on the transmission line theory, in the C band frequency range from 4 to 8 GHz, are presented in this paper. The main goal of this paper was to investigate the potential use of a single layer of the agro-waste for no reflection (perfectly matched) condition. We fabricated samples by mixing the Rice Husk Powder (RHP) with a commercially available, an easy to apply and non-toxic, glue and complex permittivity was measured. These measured values were then used to determine the perfect impedance matched condition and finally we simulate the material using CST MWS software.