Dual-Band Transmitarray With Low Scan Loss for Satcom Applications

This communication presents the experimental validation of independent and wide beam scanning with a dual-band transmitarray antenna (TA) in Satcom upand down-links at Ka-band. The TA consists two subarrays: one operates down-link central frequency 19.5 GHz, while other up-link centered 29 GHz. Both subarrays share common radiating aperture to obtain compact configuration. layout is made 1 bit unit-cells its design relies on bifocal technique extend beam-scanning capability. proposed prototype includes 1500 unitcells 30 × 50 matrix 1581 arranged 31 51 rectangular lattice. 1-D validated by displacing feed horn along direction. We show that can be scanned ±40° ±30° independently each band keeping very low scan loss (.2 dB).