A Novel Minkowski Fractal Antenna with Double U-Slots for Ka-band Satellite Communications

A novel Minkowski fractal antenna with double U-slots is proposed for Ka-band satellite communications. A second-order Minkowski fractal is used to reduce the patch size. The double U -slots can create two resonant frequencies at 29.37 G Hz and 37.54 G Hz, respectively. The simulated results by the well-known CST software validate that the proposed antenna is capable of covering the frequency bands of 29.07 ~29.66 GHz and 37.08 ~37.92 GHz, respectively. The proposed antenna can achieve a gain of 7.0 dBi within the operating band and is applicable to Ka dual-band satellite communication. Also, its size is reduced by more than 28 % compared with the traditional double- U -slot antenna without the fractal structure.