Wideband patch-type emw absorbing belt design forelectronic heat sinks

Metamaterials are artificial materials that show different electromagnetic properties, unlike known natural materials. One of the most important features discovered in recent years is that they show excellent absorption against the incoming electromagnetic wave. Thanks to these features, it is evaluated that they can be used in many different applications from microwave band to optical band. In this thesis, the design, simulation, optimization, fabrication, and measurements of a broadband patch type metamaterial-based electromagnetic absorber structure for electronic heat sinks were carried out at microwave frequencies. The CST Microwave Studio simulation program was used in the numerical analysis and design of the metamaterial absorber structure and the electronic heat sinks. After examining the absorption effect of the designed structure in the simulation environment, optimization was carried out with the electronic heat sinks in the desired frequency range, the absorber was produced with the printed circuit technology and then the tests were completed with the selected electronic heat sinks. Since the integrated structure of the broadband metamaterial-based absorber together with the electronic heat sinks exhibits antenna behavior, the radiation pattern revealed by the simulation and farfield measurement results obtained in the experimental environment has been obtained. The best value of the designed absorber was determined by considering the physical conditions regarding the change in the number of layers. Then, the degree to which the position of the absorber belt on the electronic heat sinks causes electromagnetic radiation suppression or lens behavior to cause gain/direction was determined. In this thesis, a metamaterial-based absorber belt is designed to be used around electronic heat sinks to suppress or direct the interference effects caused by electronic heat sinks. The band selected as a single layer achieved the best suppression in the far area theta=90°, while the band was in Position-6, with an average of 6,73 dB at a rate of 75,6% when it was at the base level of the electronic heat sink. When the absorber belt was positioned in Position-2 on the electronic heat sink, it increased the gain by directing the radiation, providing an average gain of 4,92 dB at the rate of 89,81% in the far field theta=90°.