Lumjiak, "The quadrifilar helix antenna
," IEEE Trans.
Cahill, "Effect of helix turn angle on the performance of half wavelength quadrifilar helix antenna
," IEEE Microw.
Quadrifilar helix antennas
have the unique attribute of producing a circularly polarized conical beam while maintaining a relatively slender and compact form factor.
The quadrifilar helix antenna
is used for omnidirectional operation.
Gao, "Compact dual-band printed square quadrifilar helix antenna
for global navigation satellite system receivers," Microwave and Optical Technology Letters, Vol.
Recently, GNSS antenna has become a popular topic of research, and lots of GNSS antennas have been proposed, including microstrip patch antennas, quadrifilar helix antenna
, dielectric resonant antennas and Spiral antennas.
The two-element phased-array handset, shown in Figure 2, consists of two stacked radiating elements (such as quadrifilar helix antennas
), a two-bit phase shifter and supporting circuitry to control and select the optimum phase setting.