High loss flat absorber

Microwave absorber is used widely in anechoic chamber room for antenna measurements, emulating the free space. It is also used to suppress unwanted radiation in consumer electronics products (so that they are present in accordance with the existing rules) and other applications. Their characterization is usually indicates the amount of damping in certain frequency ranges, and it depends on the materials used in the mixture. Besides, there are many usages of microwave signal to human daily life such as mobile phones, television, radio and a lot more. Too much exposure to microwave radiation can also affect the human health. So, the idea of making the flat absorber is to overcome the problem and decrease the potential for human to be affected by the radiation. Flat absorber is designed using green biomass materials such as carbon. It is produced from carbon combustion process. The main objective of this project is to design a flat absorber using biomaterials to analyze green and reflection measurements of biomass. Frequency range used to measure the reflectance is 8GHz to 12GHz, which is located on the X-band. Absorber pattern 02was designed and simulated using CST microwave studio simulation. Calculated parameters were optimized using computer software Simulation Technology (CST). Experiments conducted to determine the performance of the green reflection absorber biomass. The prototype was designed to measure the NRL arch consisting of transmitter and receiver antenna and the output was measured using a Vector Network Analyzer (VNA). Therefore, the results so far have shown that carbon is an appropriate source that has great potential to be used as the material for making microwave flat absorbers with return loss less than -20 dB.