A Low-RCS Wideband Antenna Based on Share-Structure of FSA and ME-Dipole

A wideband integrated antenna is proposed with the realization of radiation and dual-polarized absorption in the same frequency band. The novelty of the proposed integrated structure lies in the share-aperture of the frequency-selective absorber and magnetoelectric dipole, which remain mutually independent and have orthogonal operating characteristics. In the share-structure, each array element can be selectively connected to an excitation port or a resistor loading (50 Omega) to reuse the antenna port impedance for receiving and absorbing copolarized waves. While the cross-polarized waves are reflected by antenna ground and absorbed by mounted resistors on the symmetric patches at the top layer of the antenna array. Consequently, the proposed antenna exhibits both wideband radiation and dual-polarized absorption simultaneously with a low profile (0.22 lambda(0)). Finally, a prototype 2 x 2 antenna array is fabricated and measured, demonstrating an impedance bandwidth of 92.7% for |S-11| < -10 dB from 2.2 to 6 GHz. Moreover, the proposed antenna has 10 dB RCS reduction bandwidth of 100% (2-6 GHz) for x- and y-polarized normally incident waves.