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. It’s a sleeve dipole, think of it as a vertical dipole antenna in which the lower radiator is hollow, and through which the feeder is routed. These antennas do a reasonable job of covering a typical home, because a vertical sleeve dipole is omnidirectional. It radiates in all horizontal directions, or if you are a pessimist you might say it radiates equally badly in all horizontal directions. [Brian Beezley, K6STI] has an interesting modification which changes that, he’s made, and slotted it over the sleeve dipole to make it directional and improve its gain and throughput in that direction.

Though its construction may look rough and ready it has been carefully simulated, so it’s as good a design as it can be in the circumstances. The simulation predicts 8.6 dB of gain, though as any radio amateur will tell you, always take antenna gain figures with a pinch of salt.

It does however provide a significant improvement in range, which for the investment put in you certainly can’t complain at. Give it a try, and bring connectivity back to far-flung corners of your home! We’ve covered quite a few WiFi Yagis here over the years, such as. But few have been this cheap. Thanks to for the tip.

Posted in Tagged,,, Post navigation. I think that is his point. The article (did YOU read it?) says that the simulation predicts 8.6 dB of gain. That statement is misleading at best, as an ideal Yagi antenna yields 7.5 dB gain (see and other references) over a dipole, IN ONE DIRECTION. But if you are planning to keep the same coverage in other directions when using this mod, you will find out where that extra signal came from. It is a “zero-sum game” in this case. You will get more signal in one direction and lose exactly the same amount from areas where you used to have a good signal.

Be aware that, to remain legal, if you use a 10dB antenna then you must reduce the transmit power by 10dB. Hence the received power will be unchanged. OTOH, you can use a high gain antenna on the receiver without restriction; this reduces the interference you suffer due to other transmitters.

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The key point is that the transmit power is defined as EIRP (effective isotropic radiated power), i.e. The equivalent power that would be radiated by an isotropic antenna. The reason is that the power limits are defined to contain the chance of interfering with other users. WiFi emissions rules vary by country. The US rules are based on EIRP (as referenced in an earlier post) with a maximum of a specific signal level. I’ve been through them pretty thoroughly a few times and I don’t recall ever seeing a non-measured universal regulation such as “you can’t increase the power transmitted in one direction using a directional antenna”.

High Gain Yagi Wi-Fi Antenna. 1024 x 768 jpeg 756kB. Homemade Yagi WiFi Antenna - Bing images. 568 x 426 jpeg 18kB.

Are you referencing the rules of some other country? How to install solidworks 2007 crack. If you think that applies in the US, please cite chapter & verse. A number of very much type-approved directional antennas frequently used in commercial WiFi in the USA disagree with your statement as it is written. The rule is your EIRP cannot go over a certain amount. To assume that you cannot to any degree focus the energy in one direction more than the stock antenna already did is to assume that the EIRP of the router with the stock antenna was already sitting right at maximum. This is unlikely to be true. So your argument “you cannot *legally* increase the power transmitted in one direction using a directional antenna.” is wrong.

If you want to use some specific numbers including the actual power output of his router and the actual db gain of his new antenna you may or may not end up with a point. In most cases, the two antennas are for diversity TX/RX. In other words, the receiver uses whichever antenna receives the strongest signal. This is done because there are lots of dead spots around your home/office at those high frequencies. As you move your phone or laptop, etc. You will sometimes have an object blocking the signal, but with two antennas, it very unlikely the path to both antennas will be blocked at the same time.

If you want to modify the antenna by adding elements to obtain some gain in one direction, you can add them to either antenna, as long as your WiFi router is configured for diversity TX/RX. That would also require following all the other ham radio rules.

In the US that would mean: – no codes or cyphers meant to obscure the meaning of the communication – nothing of pecuniary interest to the user or the user’s employer – id every 10 minutes That last one is pretty easy, just set the ssid to your ham callsign. Those first two though. Kind of goes against how most of us use WiFi doesn’t it? Of course, I’m just talking about US laws. I don’t actually know what the laws are in the UK but I bet there are pretty similar! You could put that router at the focal point of an old satellite dishForgetting the legalities of this stuff for a moment, have done plenty of tinkering in my day if you wanna get serious with extreme range, try an Ubiquiti Bullet M with Air max +28dbm screwed into a 24dbi dish, you can configure as an access point, station or repeater. This stuff isn’t that expense, and once you’ve worked with this stuff you’ll never go back I have 3 of them on my house here in Mexico and they work for miles.