A Low-Scattering Tightly Coupled Dipole Array in a Triangular Lattice

A low-scattering tightly coupled phased array antenna based on a triangular lattice with resistive metallic strips is presented in this paper. Resistive metallic strips are loaded orthogonal to the dipole at the wide-angle impedance matching (WAIM) layer to achieve an in-band low-scattering array design. Compared to a rectangular grid, a triangular grid phased array reduces the total number of elements by approximately 13.4%. The proposed array achieves ±45° beam scanning in the E- and H-planes over the frequency band of 5.6-16 GHz, while exhibiting outstanding low-scattering characteristics for cross-polarized waves throughout the operational bandwidth. The monostatic RCS reduction exceeds 10 dB within the range of 6.6-16 GHz, and it also demonstrates excellent bistatic RCS reduction under oblique incidences. A 10×10 array prototype is fabricated and measured. Both simulated and measured results are in good agreement, validating the feasibility of the design.