In this study, a novel metamaterial inspired compact cylindrical conformal dual‐band antenna with a shunt fractal inductor and bottom patch is proposed. The conformal antenna consists of three meander lines type unit cells of composite right/left‐handed metamaterials for modification and compactness. To improve the operating bandwidth in the first band i.e at 2.45 GHz, a shunt fractal inductor with large inductance is proposed. A similar patch with a slot along the bottom side is additionally used for better impedance matching. The second band at 3.5 GHz is obtained due to the loading of two meander line unit cells on the patch as parasitic elements. The proposed conformal antenna is placed on a 15 mm radius cylinder whose equivalent planar dimension is 0.48λg × 0.36λg (where λg is the guided wavelength). Asymmetrical coplanar waveguide feed is implemented. Measurement results showed that the proposed cylindrical conformal antenna achieves a wideband −10 dB fractional bandwidth of 44.5% and a gain of 1.26 dBi at the operating frequency of 2.45 GHz and 4.5% of bandwidth and a gain of 2.2 dBi at the 3.5 GHz. The radiation efficiency is 70 and 86% at the said frequencies respectively. There is good agreement between measured and simulation data.
In this article, a novel wideband cylindrical conformal antenna using a wide slot in the ground plane is proposed. A bow-tie-shaped patch antenna is designed for Global Positioning System applications. The bandwidth of the antenna is improved by using a similar bow-tie-shaped slot in the ground plane with a larger dimension. The bandwidth is further enhanced by introducing a dumbbell-shaped slit in the patch. The antenna is fed by a 50-Ω microstrip line. The proposed planar antenna is printed on a ground plane of size 0.5 λ mm × 0.5 λ mm, where λ is the operating wavelength, and then it is transformed into a cylindrical conformal antenna with the desired radius of curvature. The proposed planar antenna is simulated, fabricated, and measured for conformal geometry with good agreement between measurements and simulation results. It is observed that the conformal antenna exhibits a fractional bandwidth of 81.4 % operating from 0.75 to 1.78 GHz, which is useful for all GPS and Galileo frequencies. The radiation pattern exhibits an omnidirectional pattern and gain of the proposed antenna is 3.5 to 4.78 dBi within the operating frequency range.
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