Abstract
An efficient Volume Integral Equation Method is proposed for the analysis of radially inhomogeneous tapered dielectric rod antennas (DRAs). This technique results in radiation pattern formulas that need only common integrations. Radiation patterns for DRAs of different radii and permittivities are calculated. The method is validated by comparison with the data obtained from CST Microwave Studio integral equation solver. Furthermore, radiation pattern of different permittivity profiles are evaluated and compared to achieve the optimal design parameters. The design formulas for choosing the maximum and minimum radii for different permittivity profiles are presented and compared to achieve the desired radiation parameters. An accurate formula for the calculation of antenna bandwidth is proposed. It is shown that decreasing the dielectric constant of tapered rod in the radial direction results in higher antenna gain and wider operating bandwidth.
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