Wireless Technology

Understanding the Basics of Yagi Antenna

best yagi antennas

The way to understand the working principle behind the yagi antenna theory is getting yourself familiar with the stages of its currents which are evenly distributed in the antenna through its different elements.

The yagi antenna and its parasitic elements operate by virtue of re-radiating inherent signals in what can be described best as an altered state of the element driven. This allows for signal reinforcement in particular directions but in others, it is canceled out.

While we will never qualify any additional elements to the Yagi system antenna as directly driven because their source of power is actually from the component itself, then we refer to them as parasitic elements.

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One design boundary for the Yagi system of an antenna, the power intended for its additional elements is not driven. Accordingly, we don’t have any way or mechanism to implement control over the phase and the amplitude of the current induced. This would all depend on the spacing and length between them as well as the driven element or dipole.

What does this signify to us?

It is telling us that there is no possible way we can cancel it in one single direction only. But obtaining a high level of reinforcement would remain and will not be taken away. The yagi antennas can provide us relevant gain levels.

To acquire the necessary phase shirt, one element needs to be transformed as either capacitive or inductive. Each of the different kinds of reactance comes with a different kind of impact.


The moment that a parasitic element becomes inductive, the currents induced in this phase will reflect power at a safer distance away from the parasitic elements. By this measure, it renders the RF system antenna to diffuse more energy but in the opposite direction to this type of parasitic element. Elements that are displaying this kind of behavior is referred to as a reflector.

By tuning an element to go below resonance, it can become inductive. Make it possible when you add inductance using a coil. Another common technique used here is growing it longer and allow it to go beyond the length of the resonant.

Normally, it is made to reach around 5% longer compared to the element driven since it will significantly help save on costs. It also helps in mechanically keeping the element as just one single piece, consequently renders it stronger and cheaper.

It is just the reflector that will ever be used. Adding more reflectors is not likely to make any significant disparity.


Should the parasitic element becomes capacitive, the currents induced will be in a stage that will cause the power emanated by the antenna towards the parasitic element’s direction. An element that displays this kind of behavior is referred to as the director and can become capacitive by having it go above resonance. To get this done, you can try adding capacitance to the element in the shape of a capacitor.

By further adding directors, you are also strengthening the antenna’s directivity to the next level, which will reduce the beamwidth but increases the gain. As for the successive director’s length, it is slightly reduced.

UHF Antenna: Giving the Best Reception for Your TV

If there is one invention that we can consider to be the best, it would be an antenna system. Such does not only allow users to receive clear radio signals but most of all, but this also allows users to communicate through airwaves. In addition, this allows them to capture transmission signals from nearby broadcasting stations.

One of the most common problems that are encountered by TV viewers is that they have to adjust their antennas over and over during bad weather conditions like windy seasons. Then during the early ’50s, there comes the existence of a UHF antenna. This has become very useful among TV viewers. Aside from this, they encounter interferences in their television signals, as the aerial catches different signals. These are the signals that can be in the form of mobile phones, radio stations, WIFI, HD channels, and wireless telephones.

UHF Antenna: The Option to Choose

Generally, this type of antenna installation is primarily based on the location where you want it to be installed. This means that this antenna needs to be installed in a place where it can capture the needed signal properly. One thing to keep in mind is that this antenna should be positioned in a way that the transmitted signals will not be obstructed by blockages. These blockages are things like trees and tall buildings.

As much as possible, try not to have your antenna installed indoors as it would not be able to properly capture the signal. There could be chances that the indoor antenna would not capture almost fifty percent of the transmitted signals. It would be better if you can seek the help and services of a professional provider to do the work.

Expert Help

Hiring an expert technician provider will be very helpful for you to know which location and what will be the best type of antenna to you need to get installed. The experts will install the antenna in the best position and direction.

Best UHF Antenna in Australia

One more important factor that should be considered when it comes to ultra-high frequency aerial is the distance of your place from the nearest broadcasting station. In order to make this clear, you need to be properly aware of how far the source of the broadcast signal from the current location is. The farther you are from the station, the weaker the signal will become.

In case you want to put up in a location that is far from the broadcasting station, then you will be needing a bigger and stronger antenna. If this is not possible, then it would be advisable that you choose a broadcasting station that is near your location that opting for one that is not. We cannot deny that with the availability of antennas, we are able to enjoy better reception and signals. If you are planning to have one installed in your place or if you want to do some upgrade, then you need to take your time and consider choosing the best antenna for your needs. Visit this link for more information on antennas.