Uniform yolk-shell V(2)O(5) microspheres were synthesized via a facile template-free solvothermal route and subsequent calcination treatment in air. The resulting cathode materials showed a high specific capacity of 220 mA h g(-1) after 30 cycles and good rate capability.

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A wideband, low profile and high gain dielectric resonator antenna is investigated in this paper. The antenna consists of two dielectric layers with different permittivities and it is centrally fed by a rectangular slot. By placing the dielectric layer of low permittivity (2.2) below that of high permittivity (15), the antenna with low profile of 0.1λ 0 can obtain a 10-dB impedance bandwidth of ~40% and an average gain of ~9 dBi.Index Terms-Dielectric resonator antenna, wideband antenna, low-profile antenna, high gain antenna.

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