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Build Yagi Antenna Wifi Receiver Review
Build Yagi Antenna Wifi Receiver Reviews

A High Gain Yagi Wifi Antenna

Yagi Uda antenna is a popular antenna for its high gain and simple design. This antenna is used for TVs, Amateur radios, Internet connectivity. Yagi feeders for wifi dish antennas are simple to construct, durable, and effective. Note that a wifi biquad, biquad, or 'cantenna' waveguide feed would work well in a wifi dish antenna, and would have a slight polarization advantage over a helical - but would lose more signals in rain and not work as well with signals reflecting off of.

What is a Yagi antenna? A Yagi antenna is a directional antenna that improves radiation in a single. Amazon Link - Link - WiFi Antenna 2.4GHz2.4Ghz Yagi WiFi Antenna - RP-SMA Directional Transmitter. YAGI Wifi ANTENNA CONSTRUCTION: Assemble the yagi wifi antenna following the steps below, starting with preparation of the boom, followed by mounting the elements. After the elements are mounted, a suitable connector is added, and the antenna is tested over-the-air.

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UPDATED 03/29/2020: Embedded video of actual construction of the wifi yagi antenna. Removed angry rantabout ' instructables' taking my graphic without crediting ab9il.net as the source. After more than a decade, I willjust let it go and GTF on with life..

Build this wifi antenna when you want results FAST and have just a few inexpensive tools and supplies available. It will greatly extend your ability to reach wifi access points - well beyond the limits of the dipoles suppliedwith most routers and some wireless adapters. When connected to a typical USB wireless adapter,the performance is excellent. When connected to a high powered wifi adapter,the performance is astounding! Forget about building those overly hyped wifi cantennas - they don'tperform anywhere close to the yagi antennas depicted here. This antenna works best when connected to a wifi adapter, and it works very wellas a single router antenna (to extend the range of an access point). Read more below for instructions and a narrative of how they were designed.

Build a wifi yagi antenna for longer range connections.

If your goal is to get wireless internet from another building and use it indoors, you shouldinstead consider using a wireless bridge. If you want to provde strong wireless internet coverage to an area,but cannot provide a fiber optic or ethernet cable to your wireless router, again consider using a wirelessbridge to substitute for the unavailable cable, and connect the bridge to the router. A wireless bridge is abetter solution for situations such as:

Wireless bridges work like a long run of ethernet without cable..

Providing internet connectivity from one building to users in a remote house or office.
Providing internet connectivity from one highrise building to another across town.
Providing internet connectivity from an onshore location to users on an island.
Sharing connectivity between two locations which can't be linked by cable.

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If you are interested in building a high gain wifi yagi antenna, continue reading below for the details.

Reach hotspots via window mounting.

Connect through concrete walls!

The 15 element yagi wifi Antenna
dimensions in the W9CF java applet.

The antenna modeler also
lists element lengths and positions.

The yagi wifi antenna design depicted here can be built in just an hour or two, and it works great! It is computer designed, made of wood and wire, and provides high gain and directivity. It is directional - favoring wi-fi signals in one direction and rejecting interference from the sides or behind the antenna. The 15 element wi-fi antenna provides over 15 dB of gain (multiplying your effective radiated power by 31), while the larger 20 element wifi antenna provides over 17 dB of gain (multiplying your effective radiated power power by 51). Front to back ratio for both antennas is about 22 dB.

Yagi wifi antennas can be rather difficult to build, but it can be done if you measure precisely and cut precisely.The hard mathematical design work for the wifi antennas shown here was accomplished elegantly using a yagi antenna modeler, created by Kevin Schmidt (W9CF) and Michael Lee.

The on-line antenna modeler initially starts with several examples tailored for operation in the amateurradio bands. One of the best designs is the classic K1FO yagi. By following a few steps, the antenna can be scaled for the 2.4 Ghz wifi 802.11 b/g/n frequencies:

Start with the 15 or 20 element K1FO 70cm example.
In the 'units' menu, select 'Radians.'
In the 'conductivity' menu, select 'Copper'
In the 'frequency' field, enter 2450 (MHz) for the center of the wifi networking band.
For 'Element Diameter', enter 0.08729 (radians).
Click the 'calculate' button.
In the 'units' menu, select 'millimeters.'
Note that the element diameter perfectly matches 14 gauge wire!
In the file menu, select 'list elements.'

The elements list will show each antenna element, from the reflector (element 1, position zero mm), to the last director. Do not use a different metal or a different diameter of metal for the elements, or performancewill suffer. Changes in element diameter, metal type, or design frequency will need recalculation and the generation of a new elements list. These dimensions work quite well:

**Element data for the 15 Element Yagi Wifi Antenna.**
Element	Length (mm)	Position (mm)
1 (Reflector)	59.61	0.00
2 (Driven Element)	58.55	18.34
3 (Director)	55.20	25.75
4 (Director)	53.62	39.51
5 (Director)	52.38	58.55
6 (Director)	51.68	82.19
7 (Director)	50.97	109.70
8 (Director)	50.62	140.74
9 (Director)	50.26	174.60
10 (Director)	49.91	210.94
11 (Director)	49.56	249.38
12 (Director)	49.21	289.60
13 (Director)	48.85	331.39
14 (Director)	48.68	374.25
15 (Director)	48.50	418.52

**Element data for the 20 Element Yagi Wifi Antenna.**
Element	Length (mm)	Position (mm)
1 (Reflector)	59.96	0.00
2 (Driven Element)	58.91	18.34
3 (Director)	55.56	25.75
4 (Director)	53.97	39.51
5 (Director)	52.73	58.55
6 (Director)	52.03	82.19
7 (Director)	51.32	109.70
8 (Director)	50.97	140.74
9 (Director)	50.61	174.60
10 (Director)	50.26	210.94
11 (Director)	49.91	249.38
12 (Director)	49.56	289.60
13 (Director)	49.21	331.39
14 (Director)	49.03</

Build Yagi Antenna Wifi Receiver