Received Field Intensity and Power Density Calculation
Below is a calculation tool to help determine the received field strength (in V/M or dBµV/m) and convert that result into power density (µW/m2, mW/m2, W/m2, or µW/cm2 ).
Field intensity or power density calculations are necessary when:
- estimating electromagnetic interference (EMI) effects
- determining potential radiation hazards (personnel safety and RF exposure)
- measuring or verifying specifications
Calculations:
| Received Signal: | |
| : | dB/m |
| Cable Loss: | dB |
| Preamplifier Gain: | dB |
| Field intensity | |
| Power density |
Formulas:
Field intensity (dBµV/m) = RS(dBµV) + AF + CL - G
All conversions are based on:
* 50 ohm impedance
* Far-field measurement
* Free-space conditions (impedance of 377 ohm)
dBm to Volts to Watts conversion
Free-Space Path Loss Calculator
Useful formulas for RF related conversions
* 50 ohm impedance
* Far-field measurement
* Free-space conditions (impedance of 377 ohm)
Downloads:
A handy little Field Intensity and Power Density Conversion TableOther Resources
Field Intensity CalculationdBm to Volts to Watts conversion
Free-Space Path Loss Calculator
Useful formulas for RF related conversions
Product Showcase
Double Ridge Guide Horn Antenna
SAS-571
- 700 MHz to 18 GHz
- Precision machined, Rugged Construction
- Broadband High Frequency
High gain, low VSWR, input handling capability up to 300 watts CW, and rugged design make this EMC horn antenna excellent for both immunity and emissions testing.
Additional Resource
Field Intensity Calculations
Here is a calculation tool to help determ the actual field intensity or power density at a given distance. [more...]
Contact Details
A.H. Systems, inc.
9710 Cozycroft Ave.
Chatsworth, CA 91311
P: (818) 998-0223
F: (818) 998-6892
E: Email