Input impedance of annular-ring microstrip antennas with adielectric cover |
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Authors: | Fan Z. Lee K.-F. |
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Affiliation: | Dept. of Space Phys., Wehan Univ., Hubei; |
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Abstract: | A theoretical and numerical analysis of the annular-ring microstrip antenna with a dielectric cover is performed. The problem is formulated in the Hankel transform domain, taking a coaxial feed into consideration. The integral equations for the surface current density on the patch are derived. Galerkin's method is used to solve for the surface current density, and a stationary formula for the input impedance is obtained. Numerical results showing the effects of a dielectric cover on the TM12 mode of the annular ring are given. It is found that the dielectric cover reduces the resonant frequency, decreases the resonant resistance, and increases the impedance bandwidth |
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