In this letter, an approach for designing a tunable and steerable antenna ispresented. The antenna model is based on a wideband bow-tie radiating elementmounted above an active Artificial Magnetic Conductor (AMC). The AMC geometryconsists of a Frequency Selective Surface (FSS) printed on a thin groundeddielectric slab in which some chip-set varactor diodes are placed between themetallic elements and the backing plane through vias. The resulting antenna canbe tuned over the S-Band by simply changing all varactor capacitances throughan appropriate biasing voltage. Moreover, this structure can operate a beamscanning over each working frequency by applying an appropriate biasing voltageto the active elements of the AMC surface in accordance to leaky radiationprinciples. The low profile active antenna is characterized by an overallthickness of 5.32 mm, which corresponds to approximately lambda/24 at thecentre of the operating band.
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