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        Leaky Wave-Guide Based Dielectric Resonator Antenna for Millimeter-Wave Applications

        Sovan Mohanty,Baibaswata Mohapatra 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.3

        In this paper, a leaky wave antenna based on the parallel non-radiative dielectric guide (NRD) has been proposed. This novel design uses two parallel dielectric strip waveguides having a dielectric constant of 2.2 are placed over a substrate of the dielectric constant of 2.55 and both are separated by a ground plane. The upper structure is bounded by defl ating conducting strip having distance less than λ 0 /2. The leakage from this antenna is in the form of surface wave concentrated more in the broadside direction rather than usual endfire or off broadside direction. It has been observed the proposed radiating structure has radiation effi ciency of 82%, the peak gain of 5.94 dB with narrow impedance bandwidth, and the resonating frequency at 13.59 GHz, 13.43 GHz, and 13.93 GHz. A comparative analysis is made by increasing the height of the dielectric strip to increase the number of modes. This leaky-wave structure based on a non-radiative dielectric (NRD) guide can be a suitable candidate for the device to device (D2D) communication in the millimeter-wave band.

      • Felodipine loaded PLGA nanoparticles: preparation, physicochemical characterization and in vivo toxicity study

        Jana Utpal,Mohanty Anjan Kumar,Pal Sovan Lal,Manna Prabal Kumar,Mohanta Guru Prasad 나노기술연구협의회 2014 Nano Convergence Vol.1 No.31

        Felodipine, a calcium channel blocker has been widely used for the treatment of hypertension and cardiovascular diseases; but the frequent dosing is needed for its poor solubility and variable bioavailability. In present study an attempt has been made to overcome the problems through nanoparticulate delivery system using poly (D, L-lactic-co-glycolic acid) polymer keeping in the view to get better sustainability of the formulation. The nanoparticles were prepared by single emulsion solvent evaporation technique and the physico-chemical characterization of prepared nanoparticles confirmed the particles were nanosize range with smooth and spherical morphology. Further, the compatibility of drug-polymer combination was analyzed by FTIR and DSC study. The in vitro drug release study of PLGA nanoparticles showed longer duration of drug release with reduced burst release compared with pure felodipine. The in vitro drug release data were fitted with various mathematical models to establish the drug release mechanism from the nanoparticles and found to follow mixed order kinetics. The in vivo toxicity study in albino mice showed no noticeable change in biochemical parameters and histopathology of organs. Hence, the developed felodipine nanoparticles were prepared, characterized and could possibly be advantageous for prolonged drug release and improving the antihypertensive effect.

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