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A novel approach for the gain enhancement of microstrip reflectarrays is proposed. The measured gain is increased by 2.5 dB when the solid ground plane is replaced by a photonic bandgap structure that consists of a periodic array of perforations on the ground plane. The size of each of the differential phase-shifting patches is properly readjusted as the perforation alternates the phase of the reflected field from the patch.
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Shum et al. (2000) studied this question.
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