Radiated Power

Measurement Metric

Radiated fields are quantified either as equivalent isotropically radiated power or effective radiated power. The former uses an isotropic radiator as the baseline while the latter compares the signal to a half wave dipole. This distinction is essential for understanding compliance reports.

Testing Method

Anechoic chambers isolate the transmitter and measure the field strength at a fixed distance using a calibrated horn antenna. This step prevents ambient radio signals from corrupting the test results. The emitter is rotated three hundred and sixty degrees to find the maximum field intensity.

Compliance Limit

Standard limits are established by regulatory bodies to protect the public from excess radiation. The maximum permitted level is determined by the specific frequency band and the application type. It ensures that the device operates within safe and efficient boundaries.