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5.8 GHz known as short range but higher speed for WLAN comm such as for WiFi routers. What would be advantages of using 10 dBi router antenna instead of 7 dBi at 5.8 GHz? Longer distance?

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  • \$\begingroup\$ Twice the radiated power on the face of it. \$\endgroup\$
    – Andy aka
    May 19, 2020 at 15:43
  • \$\begingroup\$ @Andyaka assuming it's directional antenna and gain enhancement happens thanks to directivity increment \$\endgroup\$ May 19, 2020 at 15:46
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    \$\begingroup\$ He means ERP, effective radiated power. You're correct that the total radiated power stays the same. \$\endgroup\$ May 19, 2020 at 15:48

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The 10dBi antenna will increase the range by about 1.4X in free space, provided the antennas are polarized and aligned correctly. The 7dBi will be more forgiving of misalignments. For a typical WiFi setup, where portable users are generally unaware of their antenna location or orientation, and in some cases even the router's location, I'd choose the 7dBi for its wider angle.

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    \$\begingroup\$ That assumes the antenna patterns are fixed. If it's a MIMO setup, then the beam pattern and directivity are dynamically adjustable, within constraints, of course. \$\endgroup\$
    – SteveSh
    May 19, 2020 at 15:50
  • \$\begingroup\$ Let me ask a question then, how big change would happen in distance and coverage if I use 1 dBi omnidirectional instead of 5 dBi omni? \$\endgroup\$ May 19, 2020 at 15:50
  • \$\begingroup\$ Your range would drop to about 0.65 the range of a carefully aligned device compared to the 5dBi, but would be better for devices off the plane normal to the antenna. \$\endgroup\$ May 19, 2020 at 16:05
  • \$\begingroup\$ @CristobolPolychronopolis excuse me which devices you mean? like cell phones? \$\endgroup\$ May 19, 2020 at 16:15
  • \$\begingroup\$ Exactly. Laptops as well. \$\endgroup\$ May 19, 2020 at 16:40

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