Realization of a Low Radar Cross Section Antenna Based on Band-Notched Absorber

A low radar cross section antenna based on band-notched absorber is described in this paper. Firstly, the band-notched absorber is formed by introducing a notch band with full reflectance performance into a wider absorption band. For each absorbing cell unit, two independently magnetic and electric resonances with adjacent resonant frequencies are employed to develop the notch band, while a dipole-shaped metal strip with a resistor printed on one side of the supporting substrate and a ground plane are used to realize the wider absorption band. Within the notch band, the absorber can be served as a metal ground for antenna, while there will exist a good absorption performances out of the notch band, a significant RCS reduction is thus obtained. A dipole antenna is rigorously designed based on the frequencies of the notch band. The proposed low RCS antenna is established based on assembling the dipole antenna and the absorber together. The measured results demonstrate that the proposed low RCS antenna has fairly good radiation patterns, and more than 10dB RCS reduction out of the notch band is also realized simultaneously.