A novel spherical helical antenna with wideband, low profile and circular polarized characteristics is studied in this paper. The VSWR, circular polarization and radiation patterns are analyzed by the method of moment, in which the antenna wire is partitioned with helical segments, the subsection triangle function is chosen as a basic function and the pulse basic function as a test function. The analysis results indicate that the number of the unknown matrix to calculate is much reduced and the computing time is much saved, too. Compared with the traditional spherical and hemispherical helical antenna, this novel antenna has better radiation characteristics, which show that it is of great potential value in the field of satellite communications.