Meaning
Regulatory boundary defines the maximum allowable effective isotropic radiated power at specific frequencies to prevent interference between users. The peak EIRP mask sets the upper limit for the combination of transmitter power and antenna gain across the operating spectrum. Compliance with this rule ensures that a device does not exceed the levels permitted by national telecommunications authorities.
Out-of-band emissions are also constrained by the slopes of this limit to protect the integrity of the spectrum.
Emission Boundary
Sharp cut-offs at the edges of the assigned band protect adjacent services from leakage. A peak EIRP mask mandates that the power level drops rapidly as the frequency moves away from the center of the channel. This mechanism allows multiple operators to share the airwaves without degrading each other’s signal quality.
Filter Requirement
Filtering components and power amplifier linearity are selected to stay within the permitted power profile. The peak EIRP mask influences the choice of components because excessive noise or distortion would push the signal over the limit. Engineers adjust the gain of the antenna and the output of the radio to find the highest possible performance that remains legal.
Compliance Verification
Laboratories use spectrum analyzers to record the emission levels during the approval process. A failure to meet the peak EIRP mask requires a redesign of the RF front end or a reduction in the transmit power. The final report confirms that the device is safe for deployment in the public infrastructure.
