Dual-Band Transmitarray with Low Scan Loss for Satcom Applications

Kien Pham (1) , Guang Liu (2) , D. Gonzalez-Ovejero (3) , Ronan Sauleau (3)

1 VNU - Vietnam National University [Hanoï]
2 NSSC - National Space Science Center [Beijing]
3 IETR - Institut d'Électronique et des Technologies du numéRique

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

Mots clés: Bifocal; Satcom; dual-band; dual-polarization

Domaines: Sciences de l'ingénieur [physics]

Kien Pham, Guang Liu, D. Gonzalez-Ovejero, Ronan Sauleau. Dual-Band Transmitarray with Low Scan Loss for Satcom Applications. IEEE Transactions on Antennas and Propagation, 2021, 69 (3), pp.1775-1780. ⟨10.1109/tap.2020.3031410⟩. ⟨hal-03099318⟩