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The theoretical and experimental results illustrating the basic characteristics of microwave metal and dielectric circular patch antennas with axisymmetric excitation have been presented. Required relations between electromagnetic and geometrical parameters of the experimental antenna prototypes have been selected from the theoretical considerations. Employment of HEMT technology allowed us to obtain both the antenna gain not worse than 12dB and its uniform radiation in the measured bandwidth of 12%. The level of cross-component is less than -25dB over the entire working frequency band. Radiation patterns of ceramic patch antennas are of interest for designing the multi-beam antenna systems and beam forming patch array antennas.