SELF-PHASING OF QUADRIFILAR HELIX ANTENNA BY RELATIVE AXIAL DISPLACEMENT OF BIFILARS

摘要

Self-phasing can be achieved in a quadrifilar helix antenna (QHA) by displacing one of the bifilars along the axis of the helix, yielding a circularly polarized cardioid shaped pattern. Impedance bandwidth of 10% (2105-2345 MHz) has been achieved with Front to back ratio greater than 10 dB. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:430-432, 2015