A Solar Energy Absorber Design Using Metamaterial Particles for Renewable Energy Solutions In this paper, a highly efficient solar energy absorber is proposed within the visible light regime, for future integration with renewable energy solutions, for instance solar cells and other smart renewable energy resources. The absorber is based on metamaterials concept and comprises the design of an infinite array of multiresonant particles that are at the nanoscale. Due to the dimensions of the proposed highly resonating structure being very much smaller than the incoming solar energy operating wavelegnth, the absorber allows for much absorption of sunxe2x80x99s radiation energy, more absorbed photons, and hence higher absorption rate. Numerical studies are carried out in this work using COMSOL MultiPhysics solver. After optimizing the metamaterialsbased absorber, a unity absorptance value at 540THz was achieved, while at the same time achieved absorptance rates over 80% for other subfrequency bands within the solar radiation spectrum. The achieved results in this paper are promising to invest on metamaterials for generation and construction of lowcost smart solar cells solutions with highly efficient absorbers.

Compact UltraWideband Monopole Antenna Loaded with Metamaterial A printed compact monopole antenna based on a single negative (SNG) metamaterial is proposed for ultrawideband (UWB) applications. A lowprofile, keyshaped structure forms the radiating monopole and is loaded with metamaterial unit cells with negative permittivity and more than 1.5 GHz bandwidth of nearzero refractive index (NZRI) property. The antenna offers a wide bandwidth from 3.08 to 14.1 GHz and an average gain of 4.54 dBi, with a peak gain of 6.12 dBi; this is in contrast to the poor performance when metamaterial is not used. Moreover, the maximum obtained radiation efficiency is 97%. A reasonable agreement between simulation and experiments is realized, demonstrating that the proposed antenna can operate over a wide bandwidth with symmetric splitring resonator (SSRR) metamaterial structures and compact size of 14.5 xc3x97 22 mm2 (0.148 xcexbb0 xc3x97 0.226 xcexbb0) with respect to the lowest operating frequency.