||In the thesis, based on the design of periodic structure (photonic bandgap, or frequency selective surface), a circuit analog radar absorbing structures (RAS) is fabricated by replacing the resistive sheet of a Salisbury screen by a frequency selective surface (FSS). In the literature, related research and design methods have been proposed. But the optimal designs have to use very specific dielectric coefficient of the material. So, the design is not so easy to achieve. Based on the specification of the absorber, we will analyze the frequency band of suitable material. First, we will design the frequency selective surface (FSS) to match the imaginary part of the impedance of the material. Then, to refer the literature of the Jaumann multi-layered structure, we design the impedance converter on the load by the principle of one-quarter wavelength impedance converter. It will be well-matching and realistic. The validity of the procedure is verified using full-wave EM simulations and experimental characterization of a fabricated prototype of the proposed thin loads for X-band planar absorbers. The proposed thin loads for X-band planar absorbers can be used in X-band satellite communications systems.|
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