A wideband filter with a notched band is presented. The proposed filter is formed by cascading three coupling units, and each coupling unit is composed of two curved T-shaped microstrip patches at the top and bottom layers and a circular coupling slot at the mid layer. Overlapping three coupling units could result in a wideband filter with a tunable notched band. To analyse the resonance characteristics, the equivalent circuit model is presented. The notched frequency is 5.8 GHz, and within the passband, the insertion and return losses are better than −2 dB and −15 dB, respectively. The group delays are 0.08 ns and 0.12 ns correspondingly, and the upper stopband reaches 15 GHz. The multi-layer structure leads to a compact size and tight coupling characteristics, and the feasibility and excellent performance of the design is verified.
A new composite (CCSs/MOFs) of carboxylrich carbon spheres (CCSs) and copper-based metal-organic frameworks (MOFs) was for the first time prepared. The CCSs/MOFs composite was synthesized by the coordinated growth of high surface area and porous MOFs, [Cu 3 (BTC) 2 (H 2 O)] n (HKUST-1), on the surface of the functionalized CCSs obtained through a one-step hydrothermal carbonization of glucose with acrylic acid at 180°C for 24 h. The resulting composites showed a core/ shell structure with a tunable diameter arranging from 0.6 to 3.0 lm, and possessed high specific surface area of 495 m 2 /g and nanoporous structures derived from MOFs. Further, the catalytic oxidation of benzylic alcohol to benzaldehyde as its application was studied.
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