Abstract
This study presents a design for a millimeter-wave reflectarray (RA) with simultaneous polarization and beam direction control. A dual-polarized unit cell (UC) based on liquid crystal (LC) material is proposed and an RA is designed accordingly. The UC comprises a back-plate reflector, a double slot-loaded ground plane, and two rectangular patches. The LC material is used between the patches and the common slot-loaded ground plane. By illuminating the UC with a slant polarization, the wave decomposes into two components, and by applying a proper voltage to each patch, the polarization and beam direction can be manipulated. A 10 × 10 RA has been fabricated and measured. The horn feed illuminates the RA with a fixed linear polarization, and four types of polarization are generated with a 70 ◦ and 100 ◦ scanning range in the E- and H-planes, respectively. The measured 3-dB gain bandwidth is 6% and the axial ratio (AR) bandwidth is 5% with around 15% aperture efficiency (AE).
| Original language | English |
|---|---|
| Journal | I E E E Transactions on Antennas and Propagation |
| Volume | 73 |
| Issue number | 3 |
| Pages (from-to) | 1894-1899 |
| Number of pages | 6 |
| ISSN | 0018-926X |
| DOIs | |
| Publication status | Published - Mar 2025 |
Keywords
- Beam scanning
- circular polarization
- liquid crystal (LC)
- millimeter wave
- polarization
- reconfigurable
- reflectarray (RA)