Abandoned agricultural waste pose a risk to the environmental and public health. The
polyurethane and polystyrene material for designing pyramidal microwave absorber are
expensive and not environmental friendly. Tropical crop residue has potential to be used in
the electromagnetic testing area. Nowadays, electromagnetic absorbing materials have
been increasingly important in ensuring successful Radio Frequency (RF) anechoic
chamber testing performance. New material had been research to reduce the cost of …