Wi-Fi Standards

A complete reference for Wi‑Fi standards, frequencies, channels, security, antennas, and troubleshooting.

Wireless networking is built on the IEEE 802.11 family of standards. Each generation improves speed, efficiency, and spectrum usage. This toolkit provides a technician‑grade reference for Wi‑Fi technologies, frequency bands, channel planning, security, and performance optimization.

Wi‑Fi is defined by the IEEE 802.11 family of wireless networking standards. Each generation improves speed, range, efficiency, and spectrum usage. This guide summarizes every major Wi‑Fi standard from 802.11a to Wi‑Fi 7 and provides a technician‑grade reference for Wi‑Fi technologies, frequency bands, channel planning, security, and performance optimization.

Wi‑Fi Standards Overview (802.11a → Wi‑Fi 7)

Specification	Standard
	802.11a	802.11b	802.11g	802.11n (Wi‑Fi 4)	802.11ac (Wi‑Fi 5)	802.11ax (Wi‑Fi 6)	802.11be (Wi‑Fi 7)
Frequency	5.75 GHz (U-NII)	2.4  GHz (ISM)	2.4 GHz (ISM)	2.4 GHz (ISM) or 5 GHz (U-NII)	5 GHz (optionally 2.4 GHz for compatibility)	2.4, 5, 6 GHz (Wi‑Fi 6E adds 6 GHz)	2.4/5/6 GHz
Maximum speed	54 Mbps	11 Mbps	54 Mbps	150, 300, or 600 Mbps (MIMO)	693 Mbps, 1.6 Gbps, 3.5 Gbps, 6.9 Gbps	up to 9.6 Gbps	up to 46.1 Gbps
Maximum range	150 Ft.	300 Ft.	300 Ft.	1200 Ft.
Modulation type					MU‑MIMO, 256‑QAM	OFDMA (massive efficiency boost), 1024‑QAM, Target Wake Time (TWT)
Channels (non-overlapped)	23 total, 12 non‑overlapping	11 total, 3 non‑overlapping	11 total, 3 non‑overlapping	5 GHz → 23 total (12 or 6 non‑overlapping), 2.4 GHz → 11 total (3 or 1 non‑overlapping)
Channel widths					80/160 MHz		320 MHz
Backwards-compatibility	N/A	No	802.11b	802.11a/b/g (depends on frequencies supported)
Notes	First 5 GHz Wi‑Fi standard; less interference but shorter range.	Cheap, long‑range, but slow and interference‑prone.		Introduced MIMO, channel bonding (40 MHz), and dual‑band Wi‑Fi.	Major speed boost; dominant standard for years.	Designed for dense environments (apartments, stadiums).	Extremely high throughput; next‑generation wireless.

	Frequency	Max Speed	Max Range	Channels (non-overlapping)	Backwards-compatibility
802.11a	5.725 GHz – 5.850 (U-NII)	54 Mbps	150 Ft.	23 (12)	N/A
802.11b	2.4 GHz (ISM)	11 Mbps	300 Ft.	11 (3)	No
802.11g	2.4 GHz (ISM)	54 Mbps	300 Ft.	11 (3)	With 802.11b
802.11n	2.4 GHz (ISM) or 5 GHz (U-NII)	150, 300, or 600 Mbps	1200 Ft.	5.75 GHz–23 (12 or 6) 2.4 GHz–11 (3 or 1)	With 802.11a/b/g, depending on frequencies supported
802.11ac (Wi-Fi 5)	2.4, 5	693 Mbps, 1.6 Gbps, 3.5 Gbps, 6.9 Gbps			802.11a/b/g/n
802.11ax (Wi-Fi 6)	2.4, 5, 6	1.15, 2.3, 4.8, 9.6 Gbps
802.11be (Wi-Fi 7)	2.4, 5, 6	11.5, 23, 35, 46.1 Gbps

Standard	Wi‑Fi Name	Frequency	Max Speed	Channel Widths	Key Features
802.11a (1999)	—	5 GHz	54 Mbps	20 MHz	OFDM, low interference
802.11b (1999)	—	2.4 GHz	11 Mbps	20 MHz	DSSS, long range
802.11g (2003)	—	2.4 GHz	54 Mbps	20 MHz	OFDM, backward‑compatible
802.11n (2009)	Wi‑Fi 4	2.4/5 GHz	150–600 Mbps	20/40 MHz	MIMO, channel bonding
802.11ac (2013)	Wi‑Fi 5	5 GHz	693 Mbps–6.9 Gbps	20/40/80/160 MHz	MU‑MIMO, 256‑QAM
802.11ax (2019–2021)	Wi‑Fi 6/6E	2.4/5/6 GHz	Up to 9.6 Gbps	20–160 MHz	OFDMA, 1024‑QAM, TWT
802.11be (2024+)	Wi‑Fi 7	2.4/5/6 GHz	Up to 46.1 Gbps	20–320 MHz	MLO, 4096‑QAM

Wi‑Fi Frequency Bands

2.4 GHz

• Longest range
• Lowest throughput
• Most interference (Bluetooth, microwaves, IoT)
• Only 3 non‑overlapping channels (1, 6, 11)

5 GHz

• Medium range
• High throughput
• Many channels (DFS and non‑DFS)
• Supports 20/40/80/160 MHz

6 GHz (Wi‑Fi 6E / Wi‑Fi 7)

• Shortest range
• Extremely high throughput
• Clean spectrum
• Up to 59 channels depending on region
• Supports 160/320 MHz channels

Channel Widths & Channel Planning

Channel Widths

• 20 MHz — stable, best for crowded areas
• 40 MHz — faster, but more interference
• 80 MHz — high throughput (Wi‑Fi 5+)
• 160 MHz — very high throughput (Wi‑Fi 6/7)
• 320 MHz — Wi‑Fi 7 only

Channel Planning Tips

• Use 1/6/11 on 2.4 GHz
• Avoid DFS channels if you want maximum compatibility
• Use 80 MHz only when the spectrum is clean
• Use 6 GHz for high‑density, high‑speed environments

Wi‑Fi Security Standards

Standard	Status	Notes
WEP	Obsolete	Broken encryption
WPA	Legacy	TKIP, insecure
WPA2	Current	AES‑CCMP, widely used
WPA3	Modern	SAE handshake, stronger protection

Recommended: Use WPA3‑Personal or WPA2/WPA3 mixed mode for compatibility.

Antennas, MIMO, MU‑MIMO, OFDMA, Beamforming

MIMO (Multiple‑Input Multiple‑Output)

• Multiple antennas increase throughput
• Introduced in 802.11n

MU‑MIMO (Multi‑User MIMO)

• Router can talk to multiple clients simultaneously
• Introduced in 802.11ac

OFDMA (Orthogonal Frequency Division Multiple Access)

• Splits channels into subcarriers
• Great for dense environments
• Introduced in 802.11ax

Beamforming

• Directs signal toward the client
• Improves range and stability

Wi‑Fi Device Types

• Router — gateway + Wi‑Fi + switch
• Access Point (AP) — dedicated wireless endpoint
• Mesh System — multi‑node coverage
• Range Extender — repeats signal (not recommended)
• Wireless Bridge — connects wired devices to Wi‑Fi
• Client Adapter — USB/PCIe Wi‑Fi card

Wireless Site Survey Basics

Key Metrics

• RSSI (signal strength)
• SNR (signal‑to‑noise ratio)
• Channel overlap
• Interference sources

Placement Rules

• Place APs high and central
• Avoid metal, concrete, and appliances
• Use wired backhaul for mesh systems

Troubleshooting Quick Reference

• Check signal strength
• Switch to 5 GHz or 6 GHz
• Change channels
• Update firmware
• Reposition AP
• Reduce channel width
• Check for interference
• Restart DHCP or router