QFH Antenna Basics and Calculator

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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.

QFH Antenna, Quadrifilar Helix Antenna

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.

Antenna Azimuth and Elevation Calculator

Antenna Azimuth and Elevation Calculator

Calculate antenna azimuth and elevation angles based on Earth station and satellite longitude and latitude. Essential for RF antenna installation.

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Antenna Balanced Feeder Calculator

Antenna Balanced Feeder Calculator

Calculate the impedance of a balanced feeder antenna using this handy tool. Simply input the distance between conductors, diameter, and dielectric constant.

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Antenna Range Calculator

Antenna Range Calculator

Calculate antenna range based on transmit power, antenna gain, frequency, cable loss, and receiver sensitivity. Determine coverage distance.

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Antenna Factor Calculator and Conversion

Antenna Factor Calculator and Conversion

Calculate antenna factor and convert between antenna factor and antenna gain using our online calculators. Understand the formulas used in EMC testing.

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Bowtie Antenna Calculator and Basics

Bowtie Antenna Calculator and Basics

Explore the fundamentals of Bowtie Antennas with our calculator. Learn about different variations and essential formulas for design. Calculate wavelength, bandwidth, width, distance and height.

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