This monograph presents the developed 5.8 GHz Metamaterial Microwave Absorber (MMA). The project proposes the design and deployment of metamaterial microwave absorber structure that acts as a band stop microwave absorber and suppresses or eliminates unwanted radiation signal at 5.8GHz. The designing and the simulation part of MMA was done by using Computer Simulation Technology (CST) MICROWAVE STUDIO software. This project is a tunable project and by adjusting the length, width, shape of design, etc. it is possible to develop a MMA which solves the interference at 5.8 GHz. The monograph also compares the three different shape of design, these are square loop, octagon loop and hexagon loop in microwave absorption at 5.8 GHz. Besides, the microwave absorption of four different types of dielectric substrate such as FR-4, TLY-5, Roger RT5870 and Roger RT5880 were compared. The result obviously shows which substrate has the best performance in microwave.