QFH antenna calculator
This cacluator is based on the work of (Coppens 2025. Accessed 2026-01-18). The original web-page is not online as of 2026-01-18 so I wrote this page to perform the calculations. This is live python code, you can edit the code blocks and rerun the calculations for different antenna parameters in order to customize to your scenario.
In the original javascript version, the speed of light was set to \(3\times 10^8\) m/s. This code uses a more accurate value of \(2.997\times 10^8\) m/s from scipy so the results will not be identical. I created a verify page which uses the less precise value for validation.
Pyodide setup
QFH design parameters
This is the code block where you should set the vlaues for your antenna design.
Results
Wavelength in freespace
Compensated wavelength
This is a correction for the size of the wire.
Bending correction
Optimal conductor diameter
This is a confusing calculation in the original because it depends upon the conductor diameter.
Larger loop
This is also referred to as loop 1
Smaller loop
This is also referred to as loop 2. These are basically the same calculations except for the 0.975 factor instead of the 1.026 factor.
