This antenna will extend the range of your WiFi or 2. A yagi antenna is basically a telescope for radio waves. I tired the pringle can antenna and the Yagi beats it hands down in performance. Did you use this instructable in your classroom? Add a Teacher Note to share how you incorporated it into your lesson.

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Mountain Time:. Chat With Us. In a previous IoTuesday post, I gave examples of makeshift antennas you could build at home. I wanted to make my own and create a kind of "WiFi Divining Rod. I could then change the antenna's position and orientation to determine the best connection to the access point. I liked the design of the Yagi-Uda antenna , as they are simple to build and seem to be fairly forgiving mine didn't turn out particularly straight. I followed Biotele's Instructable to create an antenna out of Popsicle sticks, paper clips and glue.

The Instructable shows a element Yagi-Uda, which theoretically gets you about a 15 dBi gain see here to learn more about decibel reference values. I needed something that was smaller and handheld. Here, I entered the same dimensions of Biotele's antenna and then removed the last eight "director" elements.

This, in theory, would get me less gain around 10 dBi with a slightly wider beamwidth. FL cable as close as possible to the antenna's driven element. I went out to the front of the SparkFun building by our beehive -- about 75 meters away from the building and held up an unmodified Thing Dev board.

With my completely unscientific testing, I figured I was getting around 6 dB of gain over the onboard PCB antenna, which isn't bad considering the backbone was crooked, the elements weren't exactly lined up, and there was no impedance matching whatsoever among a whole host of other issues, I'm sure.

I have not performed a line-of-sight distance test, but I'm willing to bet I would be able to connect to our building's WiFi at a farther range than with just the PCB antenna. If you're looking for a quick and very cheap way to boost your Internet of Things IoT device's connection, then this makeshift antenna is one good way.

This might work well, for instance, in a classroom setting where students need to build a device to take measurements at a location where the nearest WiFi access point is a kilometer away. Additionally, the directional nature of the Yagi-Uda means that you could potentially use this setup in a small-scale transmitter hunting game assuming the transmitter was broadcasting a 2.

What other antenna tricks can you offer to help boost the range of IoT devices specifically, something in the 2. Pretty cool.

The resulting plot is the radiation pattern of your antenna. You would want the pivot point to be right underneath the "driven element", to prevent measurement errors due to varying distance between the source and yagi antenna. You can also experiment with the polarization of the receiving antenna, to determine the polarization of your signal source antenna on The Thing.

You can pick up or lose a good many dB by being "on axis" or "off axis". I like it. Then I could compare the pattern to the theoretical pattern. Experimenting with the Yagi-Uda's polarization proved to be tricky, since, I believe, most of the antennas on our access points in the office are circularly polarized. Don't mean to be a debby downer, but IIRC, the radiation pattern of a Yagi changes with it's input matching, because the current and voltage phase on the director element has to be in the 'right place' to get all the elements to work together.

There's delta and gamma matching networks to get the job done, but they aren't always easy to do at microwave frequencies. However, one idea I'd want to try is create a delta match, by taking solid shielded wires direct from the Thing's feedpoint and ground, and fanning them out to the single wire, uncut directed element. You'd then just play with the connection points to optimize the signal gain. Another really simple idea I'd have loved to see if just looping the coax a few times 3 or so would significantly improve things.

That makes a choke, which can help balance the feedline. I know chokes attenuate alot on microwave frequencies, but it'd be easy enough to try out to see if you could squeeze out a few more dB gain. Nice work. I just google and saw that you can design Yagi antenna on PCB. That would make a nice looking dev board. Need Help? Mountain Time: Chat With Us. Shopping Cart 0 items. Product Menu. Today's Deals Desktop Site Education.

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How To: Make a simple WiFi Yagi antenna

Removed angry rant about " instructables" taking my graphic without crediting ab9il. After more than a decade, I will just 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 supplied with most routers and some wireless adapters.


A Simple Yagi Antenna For Your Wi-Fi Router

When we take a new Wi-Fi router from its box, the stock antenna is a short plastic stub with a reverse SMA plug on one end. More recent and more fancy routers have more than one such antenna for clever tricks to extend their range or bandwidth, but even if the manufacturer has encased it in mean-looking plastic the antenna inside is the same. These antennas do a reasonable job of covering a typical home, because a vertical sleeve dipole is omnidirectional. The simulation predicts 8. Give it a try, and bring connectivity back to far-flung corners of your home! But few have been this cheap.


Easy to Build WIFI 2.4GHz Yagi Antenna


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