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Abstract
The impedance and radiation properties of an electromagnetically fed concentric microstrip ring antenna using log-periodic principle is investigated experimentally and compared with those of two single ring resonators. The experimental result is verified numerically by Finite Difference Time Domain (FDTD) method. The variation of voltage standing wave ratio with frequency is also measured and computed numerically for both the single rings and concentric structure. The comparison between numerical and experimental results shows good agreement over a wide frequency range. The results indicate a considerable improvement of 1:2 VSWR bandwidth for the concentric structure.