Patch (Microstrip) Antenna — Design & Link Budget Calculator
All calculations are approximate and educational. Values are in SI units unless specified.
Patch Antenna Design Results
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Link Budget Results
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Radiation Lobe (Polar)
Patch Visual (mm)
Notes & Formulas
Key formulas used (rectangular patch):
- W = c / (2 f) * sqrt(2 / (epsr + 1))
- eps_eff = (epsr + 1)/2 + (epsr -1)/2 * (1 + 12*h/W)^(-1/2)
- DeltaL/h = 0.412 * (eps_eff + 0.3)*(W/h + 0.264) / ((eps_eff - 0.258)*(W/h + 0.8))
- L = c/(2 f sqrt(eps_eff)) - 2*DeltaL
- FSPL (dB) = 20 log10(4 * pi * d * f / c) — f in Hz, d in meters
- EIRP (dBm) = TxPower + TxGain - TxLoss
- Prx (dBm) = EIRP + RxGain - FSPL - RxLoss
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