Broad beam monofilar helical antenna for circularly polarized radio waves

摘要

A broad beam helical antenna contains a monofilar winding of a constant helical diameter and large valued pitch angle. The diameter of the helical antenna is defined such that its circumference is slightly less than one wavelength of the circular polarized radio waves. The pitch angle lies in a relatively high range on the order of 18 DEG to 24 DEG . These parameters provide a generally uniform gain over a relatively wide beam angle on the order of 60 DEG off boresight. Such gain-uniformity facilitates maintaining a link between a satellite and mobile platform-mounted communication equipment.