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Magnetic Flux & Field of an Antenna

From TIL-TEK Antennae Inc.
 

 
In some applications, it is required to determine the Magnetic Flux Density or the Magnetic Field Strength of an antenna for safety and/or regulatory issues. The following application note describes a procedure which can be utilized to determine the Magnetic Flux Density and/or the Magnetic Field Strength of an antenna at any specific distance. Step 1: Calculate the power density in watts / m2 of the antenna at the desired distance by applying the isotropic radiator power density formula; (Formula not displayed) where: p - Power density (watts / m2) W - EIRP of the radiator (watts) r - Distance from radiating centre (meters) Step 2: To determine the Magnetic Flux Density of the antenna, convert the power density calculated in step 1 to flux density using the following formula: (Formula not displayed) To determine the Magnetic Field Strength of the antenna, convert the power density calculate in step 1 to magnetic field strength using following formula:
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