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2. Long-range Wi-Fi - Wikipedia

   en.wikipedia.org/wiki/Long-range_Wi-Fi

   Long-range Wi-Fi especially in the 2.4 GHz band (as the shorter-range higher-bit-rate 5.8 GHz bands become popular alternatives to wired LAN connections) have proliferated with specialist devices. While Wi-Fi hotspots are ubiquitous in urban areas, some rural areas use more powerful longer-range transceivers as alternatives to cell ( GSM , CDMA ...

3. 2.4 GHz radio use - Wikipedia

   en.wikipedia.org/wiki/2.4_GHz_radio_use

   Bluetooth devices intended for use in short-range personal area networks operate from 2.4 to 2.4835 GHz. To reduce interference with other protocols that use the 2.45 GHz band, the Bluetooth protocol divides the band into 80 channels (numbered from 0 to 79, each 1 MHz wide) and changes channels up to 1600 times per second.

4. Patch antenna - Wikipedia

   en.wikipedia.org/wiki/Patch_antenna

   4×4 array of 2.4 GHz patch antenna elements Patch antenna gain pattern. A patch antenna is a type of antenna with a low profile, usually consisting of a printed circuit board. It consists of a planar rectangular or circular sheet or "patch" of metal, mounted over a larger sheet of metal called a ground plane.

5. Wi-Fi 6 - Wikipedia

   en.wikipedia.org/wiki/Wi-Fi_6

   Wi-Fi 6E introduces operation at frequencies of or near 6 GHz, and superwide channels that are 160 MHz wide, [17] the frequency ranges these channels can occupy and the number of these channels depends on the country the Wi-Fi 6 network operates in. [18] To meet the goal of supporting dense 802.11 deployments, the following features have been ...

6. IEEE 802.11n-2009 - Wikipedia

   en.wikipedia.org/wiki/IEEE_802.11n-2009

   IEEE 802.11n is an amendment to IEEE 802.11-2007 as amended by IEEE 802.11k-2008, IEEE 802.11r-2008, IEEE 802.11y-2008, and IEEE 802.11w-2009, and builds on previous 802.11 standards by adding a multiple-input multiple-output (MIMO) system and 40 MHz channels to the PHY (physical layer) and frame aggregation to the MAC layer.

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