Journal
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
Volume 69, Issue 3, Pages 1775-1780Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TAP.2020.3031410
Keywords
Dual band; Apertures; Layout; Prototypes; Transmitting antennas; Propagation losses; Feeds; Bifocal; dual-band; dual-polarization; Satcom
Funding
- European Union through the European Regional Development Fund (ERDF)
- Ministry of Higher Education and Research, Brittany, through the CPER Project SOPHIE/STIC Ondes
- Rennes Metropole, through the CPER Project SOPHIE/STIC Ondes
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The experimental validation of independent and wide beam scanning with a dual-band transmitarray antenna in Satcom up- and down-links at Ka-band is presented. The antenna layout consists of two subarrays operating at different frequencies, sharing a common radiating aperture to achieve a compact configuration. The design relies on bifocal technique to extend the beam-scanning capability, allowing for independent scanning in each band with very low scan loss.
This communication 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 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 unit-cells in a 30 x 50 matrix and 1581 down-link unit-cells arranged in a 31 x 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 degrees and +/- 30 degrees independently in each band while keeping a very low scan loss (<2 dB).
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