In this paper, we report the phenomenon of the perfect impedance matching of high- Tc superconducting (HTS) antennas near the critical temperature ( Tc). Two HTS antennas and two gold antennas with and without matching geometry are constructed in order to investigate the variation of impedance matching with temperature. We observe an ultimate impedance matching irrespective of the matching geometry of HTS antennas around the Tc unlike the normal conducting antennas. At the temperature of 88 K the return loss rapidly drops down below -60 dB and the characteristic impedance approaches almost 50 Ω at the resonant frequency of 11.824 GHz. These can be attributed to the kinetic inductance which abruptly increases around the critical temperature.