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Microwave (MW) from cellular phones affects biological system by increasing free radicals, which may enhance lipid peroxidation (LP) and by changing the antioxidative activities which leads to oxidative damage. Present investigations are concerned with the effect of low intensity microwave on whole body exposure of male wistar rats. Twelve rats were divided into two groups i.e. control (n=6) and exposed...
In view of the trend in and requirement of microwave tubes, it is necessary to identify areas and involve academia in research and development with national laboratories and industries through sponsored projects. All concerned in the community established academic institutions, national laboratories, industries, and users must exploit the huge potential in large number of engineering college students...
Neural networks recently gained attention as fast and flexible vehicles to microwave modeling, simulation and optimization. After learning and abstracting from microwave data, through a process called training, neural network models are used during microwave design to provide instant answers to the task learned. This paper presents simple and accurate ANN models for the analysis and synthesis of CPS...
Conformal mapping has been used extensively for the design of planar lines. However, this approach needs to be improved for the design of CPS. Two different approximations have been used in this connection; duality between CPW and CPS, and partial capacitance approach. The validity of these assumptions is investigated in this paper. Conformal mapping method is combined with FEM to determine epsivre...
The CAD oriented closed-form model is presented to compute frequency dependent effective relative permittivity and characteristic impedance of a slot-line with finite conductor thickness in the range 3 mum-50 mum. The model has average accuracy of about 2% against the fullwave results from different sources in the frequency range 2 GHz-60 GHz, 2.22lesepsivrles20, 0.02lesw/hles1.0, 0.01lesh/lambda0...
Summary form only given. Microwave technology was considered as a war time secrecy initially and it was just after the golden period (1935-1945) of Microwaves, its applications started encompassing the non-military fields as well. Since then, the entire Microwave field has undergone tremendous revolution and gone through a ses change. The first planar transmission line dasiaStrip transmission linepsila...
In this article, design and development of band pass filter at X-band with the FBW of ~ 4% on silicon substrate has been presented using the dual-behavior resonator (DBR) approach. The proposed topology uses single section coupled lines to maintain the compactness and can be easily realizable with the standard microwave integrated circuit fabrication techniques. The designed filter shows high selectivity...
The synthetic, spectroscopic and biological studies of some new chromium (III) complexes derived from biologically active nitrogen, sulphur/oxygen donor ligands 2-acetylthiophene thiosemicarbazone (L1H) and 2-acetylthiophene semicarbazone (L2H) have been described. Both the ligands were prepared by the condensation of 2-acetylthiophene with thiosemicarbazide and semicarbazide hydrochloride (in presence...
A back to back waveguide to suspended stripline transition for D-band has been fabricated on 2 mil (50.8 mm) fused quartz substrate by photolithography process and the performance of the transition has been studied. The excitation of transition probe has been done by placing the rectangular probe transversely across the WR6 waveguide and using a 50 mm fixed short. To obtain low reflections over the...
Coupled transmission lines in inhomogeneous media essentially offer wide bandwidth, tight coupling (3 dB) and low attenuation. This type of structure is very useful for microwave & millimeterwave integrated circuits using planar circuit technologies like Mixers, Oscillators, Multipliers, Filters and Couplers etc. Here a computational method, based on quasi-static spectral domain technique, has...
Polyaniline (PANI) thin film on alumina was prepared by the chemical oxidation of aniline with ammonium peroxydisulphate in acidic aqueous medium. DC conductivity, microwave transmission and reflection, shielding effectiveness of the conducting PANI films is reported. The microwave system used for the measurement of transmittance and reflectance was the X-band (8.2 to 12 GHz) waveguide reflectometer.
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