Frequency Band Detail for 5 GHz
| Band | 5 GHz | ||||||||||||||||||||||||||||||||||||||||||||||||
| Band Name | 5 GHz U-NII-1 to U-NII-4 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Frequency | 5 GHz | ||||||||||||||||||||||||||||||||||||||||||||||||
| Allocated Use | WLAN | ||||||||||||||||||||||||||||||||||||||||||||||||
| Used in Region | Global | ||||||||||||||||||||||||||||||||||||||||||||||||
| Duplex Mode | TDD | ||||||||||||||||||||||||||||||||||||||||||||||||
| TDD Band (MHz) | 5150 - 58951 | ||||||||||||||||||||||||||||||||||||||||||||||||
| Devices | Search Devices that Support Band 5 GHz | ||||||||||||||||||||||||||||||||||||||||||||||||
| Popular Antennas |
Please contact an Rfwel antenna expert for help especially if you cannot find an antenna that covers all the bands of interest.
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| Radio Service |
PART 15—RADIO FREQUENCY DEVICES Technical Summary 47 CFR Part 15 regulates unlicensed devices, such as Wi-Fi routers and Bluetooth transmitters, to prevent interference with licensed services. It includes technical standards for intentional and unintentional radiators, with power limits for devices in bands like 2.4 GHz and 5 GHz. For Wi-Fi, output power is limited to 1 watt in certain U-NII bands (47 CFR § 15.407). Devices must undergo testing and meet specific emission thresholds to ensure compliance (47 CFR § 15.209). Legal Summary Part 15 governs the operation of unlicensed RF devices in the U.S., including Wi-Fi, and other consumer electronics. It specifies technical standards, power limits, and interference rules to ensure that these devices do not disrupt licensed services. Devices operating under Part 15 must not cause harmful interference and must accept any interference received (47 CFR § 15.5). Compliance includes emission limits, certification, and labeling requirements (§§ 15.201, 209). |
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| Description |
*DFS (Dynamic Frequency Selection) is required by the FCC for U-NII 2A and 2C wireless communication devices to avoid interference with radar systems that operate in the same frequency bands (to protect incumbent users). DFS allows devices to detect radar signals and automatically switch to a different channel if radar activity is detected. See 47 CFR 15.407(h)(2). **DSRC (Dedicated Short-Range Communications) or Celullar Vehicle-to-Everything (C-V2X) systems include road side units (RSUs) that require individual licenses under Part 90, Subpart M and on-bouard units (OBUs) (in-vehicle units) that are licensed-by rule under Part 95 (See 47 CFR Part 95 Subpart L). |
Footnotes:
BW of 775 MHz for U-NII-1 to U-NII-4. U-NII-1=5.15-5.25 GHz; U-NII-2A=5.25-5.35 GHz; U-NII-2B=5.35-5.47 GHz; U-NII-2C=5.47-5.725 GHz; U-NII-3=5.725-5.85 GHz; U-NII-4 = 5.85 - 5.925 GHz (DSRC/ITS/C-V2X = 5.895-5.925 GHz).