Physics

Bandwidth (computing)

Ku band

Aperture (computer memory)

Optics

Communications satellite

Astronomy

Periscope antenna

Radiation pattern

Multi-band device

Beam (structure)

Satellite

Antenna (radio)

Acoustics

Feed horn

Computer science

Telecommunications

IEEE Transactions on Antennas and Propagation

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 of two subarrays: 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 subarrays share a common radiating aperture to obtain the 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 unitcells in a 30 × 50 matrix and 1581 down-link unit-cells arranged in a 31 × 51 rectangular lattice. The 1-D 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).

Dual-Band Transmitarray With Low Scan Loss for Satcom Applications