A wideband reflectarray antenna using single-layer dipole element attached with T-shaped stubs

摘要

A wideband reflectarray antenna consisting of single-layer dipole element attached with T-shaped stubs is proposed. By varying the lengths of the T-shaped stubs, the unit cell can provide a linear phase curve covering about 420 degrees. Critical design parameters are analyzed to understand its wideband operating mechanism. Using this novel type of unit cells, a 441 element 25 degrees offset-fed reflectarray with grid spacing of lambda/3 at 10 GHz is designed, fabricated, and measured. The experimental results show that the proposed reflectarray can achieve 1-dB gain bandwidth of 24% and 1.5-dB gain bandwidth of 37%. In addition, aperture efficiency of 66.6% and cross polarization level of 29 dB are obtained at 10 GHz, respectively.