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Also looking at these log periodic antenna equations or formulas it is possible to see why the antenna gain Log periodic amateur radio antenna name. These simple formulas give an insight into the log periodic antenna theory.

It is possible to explain the theory behind the log periodic antenna in Sisman at porno indir qualitative basic form. This provides an understanding of how the log periodic antenna operates. As an introduction it is necessary to understand that the antenna elements diminish in size as does the spacing between them from back to font. Additionally the feeder polarity is reversed between adjacent elements.

Looking at the operation of the log periodic antenna, take the condition when this antenna is approximately in the middle of its operating range.

When the signal meets the first elements on the antenna i. As the feeder sense is reversed between elements, the fields from these elements will tend to cancel out and no radiation will occur from these elements. At this point the effect which is seen is that of two phased dipoles. The signal from adjacent dipoles is in phase. The region in which this occurs is called the active region of the log periodic antenna. The elements outside the active region receive little direct power. Despite this it Log periodic amateur radio antenna found that the larger Log periodic amateur radio antenna are resonant below the operational frequency and appear inductive.

Those in front resonate above the operational frequency and are capacitive. These are exactly the same criteria that are found in the Yagi.

Accordingly the element immediately behind the active region acts as a reflector and those in front act as directors. This means that the direction of maximum radiation is towards the feed point.

There Log periodic amateur radio antenna several relationships or formulas that describe the characteristics of the log periodic antenna. In particular these can be sued to calculate the lengths and spacings of the elements within the antenna. It is also possible to determine the reason for the name of the log periodic from the mathematics associated with the antenna.

The features of the antenna grow by a constant geometric multiple. As result of all the elements growing by a constant multiple then the ratios of the logarithm will be constant.

This is expressed in the formula below. It is also possible to relate the three Log periodic amateur radio antenna figures together using the formula or equation given below. It is also possible to relate the distance between two elements and the length of each one using the angle that the element lengths form at the apex within the formula below.

These are some of the basic formulas and equations that relate the basic parameters for the log periodic antenna. Log periodic antenna theory basics It is possible to explain the theory behind the log periodic antenna in a qualitative basic form. Behind the active region, the signal again falls out of phase and no radiation occurs. Log periodic formulas There are several relationships or formulas that describe the characteristics of the log periodic antenna.

Supplier Log periodic amateur radio antenna For everything from distribution to test equipment, components and more, our directory covers it. Selected Video Oscilloscope Triggering: how to trigger a scope.

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