Antenna Field Strength Calculator
Calculate electric field strength at a given distance from a transmitting antenna. This tool uses standard formulas for common antenna types in far-field conditions.
Enter transmit power and distance to instantly calculate the electric field strength in mV/m and dBµV/m. The calculator supports 11 antenna types including dipoles, monopoles, loop antennas, and isotropic radiators. Optional frequency input enables far-field validation.
Result: - mV/m
Result: - dBµV/m
Example Coverage Scenarios:
- 100 W half-wave @ 5 km, 100 MHz = 14.0 mV/m (82.9 dBµV/m) - VHF Broadcast
- 1 kW quarter-wave @ 2 km, 1 MHz = 158.0 mV/m (104.0 dBµV/m) - AM Radio
- 50 W isotropic @ 2 km, 900 MHz = 19.4 mV/m (85.8 dBµV/m) - Mobile Base Station
- 10 kW half-wave @ 20 km, 100 MHz = 34.9 mV/m (90.9 dBµV/m) - FM Broadcast
- 5 W quarter-wave @ 0.5 km, 450 MHz = 44.7 mV/m (93.0 dBµV/m) - Walkie-Talkie
This tool helps with:
Planning radio coverage and transmitter range for EMC testing
Calculating expected field strength at test distances
Comparing antenna directivity effects on field strength
Link budget calculations for wireless device testing
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Last updated on January 15, 2026
Author: IBL-Editors Team
Technical Review: Andreas Bender - Deputy Managing Director | IBL-Lab GmbH Give feedback on this article
Author: IBL-Editors Team
Technical Review: Andreas Bender - Deputy Managing Director | IBL-Lab GmbH Give feedback on this article