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In this paper, we demonstrate a metamaterial tunable filter with liquid metal, which can be tuned by adjusting the size and position of the air gap within the liquid metal. In experiment, it measures a 2.3 GHz tuning range for the tunable metmaterial unit with the working wavelength of 8.9 GHz. The tuning of 5 × 5 unit array is also demonstrated. Different from traditional metamaterials [1, 2], the...
Differentially encoding and frequency offset compensating for a 16-quadrature amplitude modulation (16-QAM) vector signal in 60-GHz millimeter-wave radio-over-fiber (RoF) systems are experimentally investigated. The fourfold phase ambiguity issue in a non-data-aided signal communication transmission system with conventional square 16-QAM constellations is successfully tackled based on the differentially...
This paper presents a terahertz tunable metamaterial filter using microelectromechanical systems (MEMS) structures. The metamaterial unit cells are tuned by micromachined comb-drive. The metamaterial slab works as a notch filter of THz region, which can lower the transmission of interest frequency down to -70 dB. In the experiment, it measures the tuning range of filter frequency from 3.32 to 3.80...
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