QFH Antenna Basics and Calculator

This page covers QFH Antenna basics and provides a QFH antenna calculator. QFH stands for Quadrifilar Helix or Quadrifilar helicoidal.

The QFH antenna is one of various antennas used to capture images from low-level, non-geosynchronous satellites. It is a very simple, effective, and efficient antenna. It doesn’t have null spots directly overhead or at other inopportune locations like some other antennas. It’s also a popular antenna used for GPS applications.

The QFH antenna design consists of two types of loops. This helps in noise reduction and elimination of null spots. Figure 1 (not included here, but imagine one!) depicts a typical QFH antenna designed with a larger loop and a smaller loop. PVC pipe, copper wires or thin tubing, coaxial cable, and BNC connectors are commonly used in its construction.

QFH Antenna Calculator

Refer External QFH Antenna Calculator web page which mentions QFH Antenna calculator with larger loop and smaller loop. This calculator is useful to design Quadrifilar Helix or Quadrifilar helicoidal Antenna.