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DESIGN AND ANALYSIS OF MULTIDIELECTRIC LAYER MICROSTRIP ANTENNA WITH VARYING SUPERSTRATE LAYER CHARACTERISTICS

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Author(s): Samir Dev Gupta | Amit Singh

Journal: International Journal of Advances in Engineering and Technology
ISSN 2231-1963

Volume: 3;
Issue: 1;
Start page: 55;
Date: 2012;
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Keywords: Microstrip Antenna | Multidielectric Layer | Resonant Frequency | Permittivity | Superstrate Layer

ABSTRACT
The multidielectric layer microstrip antenna structure involves addition of a superstrate layer over the substrate. It is important that the superstrate layer must act as a part of the antenna. Design of the multidielectric layer microstrip patch antenna based on different thickness and permittivity of the superstrate layer has significant effect in gain and antenna efficiency. The designer must however ensure that the superstrate layer does not adversely affect the performance of the antenna. With proper choice of the thickness of substrate and superstrate layer, significant increase in gain can be achieved for practical applications. This paper discusses a set of closed form expressions for the resonant frequency for the general case of multidielectric layers. Multidielectric layer microstrip antenna designed for applications where various physical properties of antenna viz. permittivity, patch dimensions, height of the substrate and superstrate layer parameters which significantly affect accuracy of the resonant frequency is analyzed. Considering the effect of superstrate layer, a method for accurately determining the resonant frequency of such structures have been obtained using variation of the patch dimension. The antenna performances have been evaluated for variety of cases of permittivity and thickness of the superstrate layer.

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