Integrated filtering-antenna with controllable frequency bandwidth

An integrated design of a band-pass filter and a patch antenna is proposed in this paper by using an aperture coupled structure. Traditionally, the microwave filter and antenna are designed separately using 50 Ohm interface and then connected by transmission lines, which lead to a large size and more loss. Here, the antenna and microwave filter are directly integrated without a 50 Ohm interface between them. Compared with the traditional cascade designing, the co-design of filter and antenna has a more compact size, simpler configuration, improved frequency selectivity and higher system efficiency. The frequency bandwidth also can be controlled by adjusting the dimension of the coupling aperture in the ground. The measured results agree very well with the simulations, showing the filtering-antenna has good performance in impedance matching, radiation pattern and antenna gain

Planar Filtering Ultra-Wideband (UWB) antenna with shorting pins

10.1109/TAP.2012.2223438IEEE Transactions on Antennas and Propagation612948-953IETP

Microstructures and electrical properties of SrRuO{sub 3} thin films on LaAlO{sub 3} substrates

Conductive SrRuO{sub 3} thin films have been deposited using pulsed laser deposition. Structure and microstructure of this system were studied using XRD, SEM, and scanning tunneling microscopy. Electrical properties of these films were measured. The film deposited at 250{degree}C is amorphous-like, showing semiconductor-like temperature dependence of electric conductivity. Film deposited at 425{degree}C is crystalline with very fine grain size (100 {approximately} 200{angstrom}), showing both metallic and semiconductor-like temperature dependence of the electrical conductivity. Film deposited at 775{degree}C shows reisistivity of 280 {mu}{Omega}{center_dot}cm at RT and resisdual resistivity ratio of 8.4. Optimized deposition conditions were determined. Possible engineering applications of SrRuO{sub 3} thin films are discussed. Bulk and surface electronic structures of SrRuO{sub 3} are calculated using a semi-empirical valence electron linear combination of atomic orbitals, and they are used to understand the electrical properties of the films

Covalent binding of the organophosphate insecticide profenofos to tyrosine on α- and β-tubulin proteins

Organophosphorus (OP) compounds can bind covalently to many types of proteins and form protein adducts. These protein adducts can indicate the exposure to and neurotoxicity of OPs. In the present work, we studied adduction of tubulin with the OP insecticide profenofos in vitro and optimized the method for detection of adducted peptides. Porcine tubulin was incubated with profenofos and was then digested with trypsin, followed by mass spectrometric identification of the profenofos-modified tubulin and binding sites. With solvent-assisted digestion (80% acetonitrile in digestion solution), the protein was digested for peptide identification, especially for some peptides with low mass. The MALDI-TOF-MS and LC-ESI-TOF-MS analysis results showed that profenofos bound covalently to Tyr83 in porcine α-tubulin (TGTY*83R) and to Tyr281 in porcine β-tubulin (GSQQY*281R) with a mass increase of 166.02 Da from the original peptide fragments of porcine tubulin proteins. Tyrosine adduct sites were also confirmed by MALDI-TOF/TOF-MS analysis. This result may partially explain the neurotoxicity of profenofos at low doses and prolonged periods of exposure