Inward Fractal Dual Band High Gain Compact Antenna

This paper presents a microstrip antenna with nested two folds fractal shape. The fractal geometry of the patch has a slotted square boundary and spheres connected to its sides. The antenna was first optimized over a 5 x 5 cm2 area, so that dual frequency operation is obtained at the IMT band and in the Radiolocation Service at 1.4 GHz and 3.2 GHz respectively. Applications include breast cancer detection in addition to a wide range of wireless devices due to the radiation pattern and directivity characteristics. The design size is further minimized targeting the ISM frequency of 2.45 GHz. A 4 x 5 cm2 and 4 x 4 cm2 design were successfully simulated with high 10 dB gain. Results of measurements coincide very well with simulations results.