QFH Antenna | Quadrifilar Helix Antenna Basics
This page covers QFH Antenna basics and QFH antenna calculator. QFH stands for Quadrifilar Helix or Quadrifilar helicoidal. It provides link to Quadrifilar Helix Antenna Calculator which is useful to design QFH antenna.
QFH antenna is one among various antennas used to capture images from low level non geosynchronous satellites. It is very simple, effective and efficient antenna. It does not have null spots directly overhead or at other in-opportune locations like other antennas. It is popular antenna used for GPS applications.
The QFH antenna consists of two types of loops in the design. This helps in noise reduction and elimination of null spots. The figure-1 depicts typical QFH antenna designed with larger loop and smaller loop.
PVC pipe, copper wires or thin tubing, coaxial cable and BNC connectors are used in its construction.
QFH Antenna Calculator
Refer QFH Antenna Calculator page which mentions QFH Antenna calculator with larger loop and smaller loop. This calculator is useful to design Quadrifilar Helix or Quadrifilar helicoidal Antenna.