The LFA (Loop Fed Array) Low-Noise Yagi is very different from the traditional dipole fed Yagi in many ways with its primary benefit being unwanted noise rejection. The LFA has a rectangular shaped, full wave loop driven element that is laid flat on the boom between and in-line with the parasitic elements . Then there is the way in which the loop functions. The smaller end sections which run parallel to the boom, are engineered to be 180 degrees out-of-phase with each other. This provides the same effect as is seen within ladder-line feeder; each side cancels the other out and therefore, minimum radiation occurs. In practice this translates to highly suppressed side lobes and side-on signal rejection. This feature also plays a role in reducing F/B (Front to Back ratio), F/R (Front to Rear ratio) and broad-banding of the antenna too. It is these attributes which help give the LFA class-leading all-round performance at almost any boom length and for any given band.
Below are a list of Key Benefits the LFA Yagi provides:
Just how does this revolutionary antenna look against others?
Compare the Azimuth and Elevation plots below. A commercially available 9 element 50MHz antenna (blue) is compared with a 9 element 50MHz InnovAntennas LFA (red). The difference? Less unwanted noise reception from all directions other than where you want it from. This translates into you hearing the DX, not just the DX hearing you!
The LFA helps you hear the stations that can hear you. For many stations with power, being heard but not hearing is commonplace. With the installation of the LFA at your station things really can be different! Not only will you have no amplifier SWR issues within any part of the band you wish to work* you can work the DX knowing that much more of what can hear you, can also be heard at your station.
Within weak signal environments such as MS (Meteor Scatter) or EME (Earth Moon Earth) LNAs (Low Noise Amplifiers) are fitted to ensure minimum unwanted noise pick-up is seen and as much of the desired signal is seen and amplified. However, until now the most important part of the receiver (the antenna) has been missed. Installing the LFA will ensure your LNA has the best platform from which to amplify your weak signals. Take a look at just how a long 144MHz EME antenna looks.
Incredible levels of F/B and F/R are seen from this antenna which shows never-seen-before levels of Sky Temperature and G/T on 144MHz. However, it is above 144MHz that the LFA really comes into its own. If comparisons were made between the LFA traditional 432MHz Yagis, huge differences would be seen. In recent comparison tests, an 18 element LFA Yagi provided better G/T (ability for an antenna to receive signals) figures than much larger traditional dipole/folded dipole fed Yagis of up to 24 elements in length! This is typical of the LFA on these bands and is one of the reasons the LFA will become known as one of the big steps forward in the development of the Yagi.
Many hams and commercial entities are already experiencing how the LFA can transform what they are able to achieve in terms of performance and many more will continue to do so as time goes by. Do you want to be a follower or a leader? Make room on your tower for an LFA on your favourite band and you too can be surprising others with just how well your station can perform!