Compact Microstrip Antenna Based on Minkowski-Like Sided Fractal

Abstract

In this paper, a compact microstrip patch antenna with Minkowski-like sided fractal structure is presented. It is fed by a microstrip feed line and a λ/4 impedance converter is introduced to provide smooth transitional impedance for improved impedance matching. The design process and performance of the fractal antennas with different iterations are given and analyzed in detail. Finally, for demonstration purpose, the second iteration version of the Minkowski-like sided fractal antenna is fabricated and tested. Measurements are in good agreement with the simulations. Measurements show that the resonant frequency is 2.14GHz with the return loss of -24dB. The proposed 2nd iteration fractal antenna provides an area reduction of 43.7% as compared with the square patch antenna with the same resonant frequency. Meanwhile, it does not degrade the performance of the antenna.