A bat-shaped micro-strip patch antenna is proposed with tri-band characteristics (11.0-11.5 GHz), (11.8-12.3 GHz), (13.0-14.3 GHz) and impedance bandwidth 4.4%, 4.1%, and 9.5% at resonant frequencies 11.36 GHz, 12.14 GHz, and 13.4 GHz, respectively. The proposed antenna exhibits peak gain of 2.6 dBi. The proposed micro-strip patch antenna shows the dual band circularly polarized characteristics with two axial ratio bands (11.0-13.0 GHz) and (13.2-14.0 GHz) and 3-dB axial-ratio (AR) impedance bandwidths 15% and 5.2%, respectively. Investigation of the proposed antenna is done using evolution technique. The results are verified experimentally in terms of reflection coefficient, gain, axial ratio, and radiation pattern.