A cylindrical conformal antenna for GPS application

A novel conformal antenna is proposed for GPS application using Koch fractal geometry. The conformal antenna is obtained by initially designing planar patch antenna at a slightly higher frequency by using Koch fractal and then the planar structure is transformed to the corresponding cylindrical conformal antenna with the required radius of curvature. The Rogers RT/duroid 5880 with permittivity of 2.2 and thickness of the material 0.787mm is used as substrate. Coaxial probe feeding is used in the proposed antenna. The proposed cylindrical conformal is having a bandwidth of 20MHz and also has a peak gain of 5.9dBi at the center frequency of 1.575GHz. The conformal antenna designed on the 60mm radius of curvature at 1.575GHz that can be used for GPS application which can accommodate L1(1.56-1.58GHz) band.