Log-Periodic Antenna — Link Budget & Designer

The tool provides a simplified design & visualization — ideal for blog readers, students and quick planning. See limitations at the bottom.

Inputs — Link Budget

Transmit power (dBm) Transmit cable loss (dB) Transmit antenna gain (dBi) Receive antenna gain (dBi) Receive cable loss (dB) Distance (m) Frequency (MHz) — centre System margin (dB) Receiver sensitivity (dBm)

Log-Periodic Antenna Design Inputs

Lowest freq (MHz) f_min Highest freq (MHz) f_max Number of elements (N) Scale factor (tau) (0.6 - 0.95) Element spacing factor (fraction of element length) (0.05 - 0.6)

Tip: tweak tau and num to see element geometry change. Results are approximations — for production designs use full EM simulation.

Results & Visuals

Link Budget Summary

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Antenna Estimated Specs

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Antenna Geometry (top view)

Estimated Radiation Lobe (polar)

Downloads: copy-paste this HTML into Blogger. Use real measurement/EM tools for production.

Limitations & Notes

• This tool provides a simplified geometric and polar approximation only — not a full-wave EM simulation.
• Element lengths are estimated as half-wave resonators for local tuned frequencies derived from tau progression.
• Radiation lobe is synthesized with a Gaussian-shaped main lobe using boom length & effective aperture approximation.
• Link budget uses standard Free Space Path Loss (FSPL). For real links include clutter, fading margin, polarization mismatch, connectors and regulatory limits.