A printed reflectarray antenna, which generates a beam that can be electronically switched from a sum to a difference radiation pattern, is presented. This is achieved by applying a bias voltage of 20 V to one-half of the aperture, which is constructed above a 500 µm cavity containing liquid crystals. Simulated results are shown to be in good agreement with measurements at X-band.
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Hu et al. (2007) studied this question.
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