Design of a Broadband Absorber Based on Antenna Reciprocity

In this paper, a broadband antenna array is firstly proposed and analyzed using a combination of characteristic mode analysis (CMA) and the theory of frequency selective surface. The element of the broadband antenna consists of crossed dipoles with end loading. The CMA is used to analyze the underlying modal behaviors and the mode excitation on the proposed antenna structure in order to guide the antenna design. When it obtains the best transmission or radiation performances, it’s configured as an absorber by reciprocity. In order to validate the theoretical solutions, a 10×10 cell prototype is fabricated and measured. The agreement between the simulated and measured results demonstrates the validity of the proposed method.