Abstract
A novel high-power axial-mode helical antenna has been developed. The antenna consists of two short helixes with the same polarization but a relative rotation angle. As the high-frequency current on the antenna is divided into two paths, its power capacity is much higher than conventional helical antenna. Some basic analysis and design of the dual-branch helical antenna are presented and a wideband, well-matched coaxial feeding for experiments has been carried out to get the frequency responses and far-field results. The results centered at 12.5 GHz indicate that the gain is 8.6 dB and the axial ratio is 2.2 dB, and it could handle a pulse power of 44.6 MW under vacuum condition.
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