917YACP, 900-930 MHz

Circular polarized antennas have many uses, most commonly for reliable satellite communications. Above UHF frequencies cross coupling of horizontal plus vertical elements can severely affect circularity. We find by using two separate yagis, one vertically and on horizontally polarized, cross coupling is minimized and good circularity is realized. Other advantages include pattern shaping and side lobe reduction. Using two yagis make RHC-LHC switching easy while Helical antennas by design are fixed at one direction or the other. This two yagi concept can be easily be expanded to more yagis for more array gain.