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Over past few years, polymer composites with natural fiber reinforcement, called eco-composites, have achieved a worldwide compliance due to their strong potentiality to save the environment from pollution as a result of their ultimate disposability, as compared to glass-filled composites. Since natural fibers combine a low cost and low density with high toughness, biodegradability, renewability,...
This paper introduces a new compact bandpass filter using a new Circular Split - Ring type Defected Ground Structures. A split ring Defected Ground Structure (DGS) when applied with a continuous microstrip line yields a very sharp stop band Lowpass filter. In the proposed structure, a T-shaped discontinuous microstrip line is included, which provides ultra wide passband. The passband of the proposed...
The shape of a popular split-ring defected ground structure (DGS) is modified by etching two concentric split-ring defective pattern which have different size and inverse split direction in the ground plane underneath a microstrip line. The frequency characteristics of proposed DGS unit show an attenuation zero close to the attenuation pole frequency. As a result, better transition sharpness, lower...
A Defected Ground Structure in the metallic ground plane of a microstrip line is attractive solution for achieving finite pass band, rejection band and slow-wave characteristics. A split-ring shaped DGS structure has a high selectivity would be preferable owing to the demand for currently expanding communication systems within finite spectrum resources. First of all a split-ring type DGS unit slot...
In this paper, a new asymmetric type Defected ground Structure (DGS) is investigated. The proposed DGS unit comprising of three numbers of square shaped slots separated from each other by same distance connect a rectangular slot by thin meander slots underneath a microstrip line. In its frequency characteristics, a finite attenuation zero is observed near to its attenuation pole frequency. The investigated...
The effect of rain attenuation in high frequency signals need proper understanding of the variation of drop size distribution (DSD) separately in convective and stratiform rain due to different characteristics. This paper presents the analysis of variation of vertical rain rate profile for these two types from micro rain radar observations as well as the variation of DSD at ground using disdrometer,...
Generation of rain attenuation time series is important for understanding the rain fade characteristics in the absence of actual fade measurements. In this paper, performance of synthetic storm technique (SST) is assessed for time series generation over Ahmedabad, a tropical location in India. Radiometric measurements at 20.2 GHz are used for attenuation calculation in zenith direction. Rain rate...
An asymmetric defected ground structure (DGS) with respect to a microstrip line is proposed. Its unit cell consists of two square slots connected with a rectangular slot by two Z-shape thin transverse slots under microstrip line. The simulated, measured and equivalent circuit responses are presented. Unit DGS pattern under microstrip line produces two numbers of attenuation poles and two number of...
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