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Pereira, R.; Gillard, R.; Sauleau, R.; Potier, P.; Dousset, T.; Delestre, X.
IEEE transactions on antennas and propagation, 12/2012, Volume: 60, Issue: 12Journal Article
A fully reconfigurable dual linearly-polarized phase-shifting unit-cell for reflectarrays is proposed in X-band. It consists of two orthogonal and symmetrical cross-type printed triangular dipoles loaded by 2 × 4 pin diodes. To keep independent phase responses both in vertical and horizontal polarizations and to minimize cross-polarization (by preserving the cell symmetry), the diodes are driven by pairs, leading to a maximum possible phase resolution of 2 bits per polarization. Two alternative solutions are described to bias the diode pairs. The corresponding phase responses of the unit-cell are compared for symmetrical and non-symmetrical diode loading of the dipole arms. The numerical results show that the biasing solution with no central via is more robust. They are validated experimentally around 8 GHz. The measured average loss and equivalent bit resolution at the central frequency equal 1.25 dB and 1.8 bit respectively.
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