Reflection co-efficient of multilayer microwave absorbers in X-band

Design of multilayer microwave absorbers has become essential for effective absorption of microwave energy in the given range of frequencies due to the limitation of amount of energy that could be absorbed by a single layer absorber. There are various methods to design multilayer microwave absorbing materials. In this, multiple layers of dielectric materials are usually placed on top of conducting or ground plane. They may be tested for different angles of incidence also. The paper initially discusses the multilayer microwave absorbers design techniques. Authors have synthesized different wt% of Barium Titanate, Strontium Titanate with epoxy resin composites as films and formed three layers. They were tested for their reflection co-efficient using the vector network analyzer R&S:ZVT8 in the frequency range of 8 GHz - 12.5 GHz (X-Band). From the measured reflection co-efficients, the results are deemed to be encouraging for the Strontium Titanate/epoxy resin with different wt%.