A dipole antenna using Sierpiński carpet fractal technique for RF altimeter system

摘要

A dipole antenna using Sierpiński carpet fractal with step impedance operates at 4.3GHz. Based on Sierpinski Carpet fractal and step impedance theory, it can suppress harmonics frequency. The proposed antenna is constructed on brass, include reflector and dipole. Its size of this antenna is 97.75 67.56 mm including reflector. This small size antenna is more compact to install in the aircraft instruments. The proposed antenna provides bandwidth of 325.3 MHz which covered an operational range of RF altimeter, gain of 11.3 dB and unidirectional pattern. The experimental result of this antenna is agreed very well with simulation expectation using CST package.