Cross-polarisation level of reflectarray with gapped ring elements

Cross-polarization Suppression in Monolayer Reflectarray Antennas

“…The cross-polarization levels obtained for the single-layer reflectarray are much lower than the levels achieved in [7][8][9][10], where some methods to minimize the cross-polarization are presented. For instance, the reflectarray presented in [7], whose size is 10.5λ and it is based on non-symmetrical elements, provides a boresight cross-polar level of −25 dB.…”

“…The 38.9λ × 38.9λ offset fed reflectarray described in [8] provides a contoured beam and achieves a level in the order of −20 dB. The reflectarray proposed in [9], whose size is 8.32λ × 8.32λ, provides −36 dB and the 52.9λ × 52.9λ Brought to you by | New York University Bobst Library Technical Services Authenticated Download Date | 7/7/15 9:58 AM re flectarray presented in [10] reduces the level to −40.7 dB. It is important to highlight that, despite these mentioned works presents simulations and measurements, the diagonal plane has not been considered in any of them.…”

Gain Enhancement for Circularly Polarized Microstrip Patch Antenna

“…The CSSSRR unit contains two coupled open loops; therefore, it has two gaps. A similar unit denoted by gapped ring pair element was studied in [8]. In [8], we have studied that gap in an open loop may block current flow in a specified direction.…”

“…A similar unit denoted by gapped ring pair element was studied in [8]. In [8], we have studied that gap in an open loop may block current flow in a specified direction. This property was employed to reduce cross polarization gain of a linearly polarized reflect array.…”

“…It was reported that the spacing from the patch to the radome requires a half wavelength to achieve a maximum gain. In [8], the radome or superstrate behaves as a highly reflective sheet at a spacing of 0.5λ.…”