Frequency-Reconfigurable Slot Antenna Enabled by Thin Anisotropic Double Layer Metasurfaces


A frequency-reconfigurable slot antenna using metasurface (MS) is proposed. 2 identical anisotropic MS layers are loaded on prime of a slot to attain the frequency reconfigurability. The MS layer is composed of a periodic arrangement of I-shaped metallic inclusions placed in both the horizontal and vertical directions. The MS layers are fed by a linearly polarized slot antenna. The operating frequency of the proposed antenna is tuned by physically rotating the two MS layers with respect to the centre of the slot antenna. Rotation of the MS layers changes the effective permittivity and the loading on the slot antenna and hence the operating frequency changes. The proposed antenna features a low profile with the thickness of the antenna as well as the 2 MS layers being . The simulated and measured results show that using the proposed technique, the operating frequency will be tuned from two.55 to three.forty five GHz with a fractional tuning vary of around 28p.c. The antenna provides a minimum gain of five.three dB with the height gain being 8.three dB. The efficiency of the proposed antenna is more than 90p.c over its tuning vary.

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