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An Active High-Impedance Surface for Low-Profile Tunable and Steerable Antennas
An approach for designing a tunable and steerable antenna is presented. The antenna model is based
on a wideband bow-tie radiating element mounted above an active artificial magnetic conductor (AMC). The AMC geometry consists
of a frequency selective surface (FSS) printed on a thin grounded dielectric slab in which some chip-set varactor diodes are placed
between the metallic elements and the backing plane through vias.
The resulting antenna can be tuned over the S-Band by simply changing all varactor capacitances through an appropriate biasing
voltage. Moreover, this structure can operate a beam scanning over each working frequency by applying an appropriate biasing
voltage to the active elements of the AMC surface in accordance to leaky radiation principles. The low-profile active antenna is characterized by an overall thickness of 5.32 mm, which corresponds to approximately λ/24 at the center of the operating band.
Schlüsselwörter: RF-60A, artificial magnetic conductor, AMC, frequency selective surface, FSS, steerable antenna, tunable AMC. 2.36 - 2.82 GHz
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