The new Act introduces a complete restructuring of the 5 GHz UNII bands, clarifying power and emission limits, creating new sub-items, and aligning the Brazilian requirements with the ETSI and FCC frameworks.

1) 5.150 – 5.250 MHz Band (Item 11.1)

The entire section has been rewritten into four explicit sub-items:

11.1.1 – Access Points (APs):

• Conducted power limit: 30 dBm
• Power spectral density: 17 dBm/MHz
• Antenna gain reduction required above 6 dBi
• Additional restriction for Outdoor AP: EIRP ≤ 21 dBm for elevation angles above 30° in outdoor environments

Impact: Allow 5.150 to 5.250 MHz band for indoor and outdoor use, adds an explicit limitation for vertical radiation (to protect satellite and aeronautical services), and expresses limits in conducted power instead of total EIRP, affecting lab setups.

11.1.2 – Fixed Point-to-Point Links:

• Conducted power: 30 dBm
• Power spectral density: 17 dBm/MHz
• Antenna gain reduction above 23 dBi

Impact: Introduces a distinct rule for directional links within 5.150-5.250 MHz, allowing higher-gain antennas before derating.

11.1.3 – Client Devices:

• Conducted power: 24 dBm
• Power spectral density: 11 dBm/MHz
• Antenna gain reduction above 6 dBi

Impact: Sets clear maximum limits for stations (STAs), preventing over-powered CPEs and improving coexistence in indoor environments.

11.1.4 – New requirements for band 5.250 – 5.350 MHz:

• Conducted power: 24 dBm or 11 dBm + 10 log B_MHz, which is the lowest
• Power spectral density: 11 dBm/MHz
• Gain reduction above 6 dBi

Impact: Introduces the bandwidth-dependent formula 11 dBm + 10 log B, harmonizing with ETSI EN 301 893. This provides flexibility for narrow- and wide-channel operations (20-160 MHz) but requires recalculation of conducted limits per bandwidth during testing.

2) 5.470 – 5.725 MHz Band (Item 11.3, modified by Art. 7)

• Conducted power: 24 dBm or 11 dBm + 10 log B_MHz, which is the lowest
• Power spectral density: 11 dBm/MHz
• Gain reduction above 6 dBi

Impact: Unifies the methodology with the new 11.1.4 formula, changing from fixed 250 mW/EIRP limits to a scalable, bandwidth-based conducted power approach.

3) Additional Clarifications

Out-of-band and spurious emissions (2.4 GHz and 5.8GHz)

• The conducted power measured in any 100 kHz bandwidth outside the authorized band must be at least 20 dB lower than the maximum power measured in a 100 kHz segment inside the band.
• When measurements are performed using the alternative method described in item 10.3.4, the attenuation requirement becomes 30 dB.

Impact: Improves spectral cleanliness and reduces interference to adjacent services. Laboratories must ensure measurement setups explicitly apply the 20 dB / 30 dB attenuation rule depending on the test method used. The change enhances alignment with FCC standard.

Out-of-band and spurious emissions (5.150-5.350 MHz and 5.470-5.725 MHz):

• Limit confirmed at -27 dBm/MHz EIRP.
• Transmit Power Control (TPC, 11.5): required dynamic range increased from 3 dB to 6 dB (referenced to 30 dBm EIRP)
• If TPC is not implemented, maximum average EIRP is 27 dBm.

Impact: Devices must implement stronger power-adaptation algorithms; older modules limited to 3 dB TPC may require firmware updates or re-assessment.