The geometry of a microstrip antenna is altered by using a periodic pattern. The aperture‐coupled antenna is realized by combining 2 × 2 unit cells in a square geometry. A 33% reduction of the resonant frequency of the original plain patch is reached by locally increasing the inductance of the unit cell. Conversely, a 60% surface reduction of dimensions of the original antenna is observed for a given operating frequency.
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Pioch et al. (2004) studied this question.
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