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The log periodic antenna is a particularly useful design when modest levels of gain are required, combined with wideband operation. A typical example of this type of RF antenna design will provide between 4 and 6 dB gain over a bandwidth of 2:1 while retaining an SWR level of better than 1.3:1. With this level of performance it is ideal for many applications, although a log periodic antenna will be much larger than a Yagi that will produce equivalent gain. However the Yagi is unable to operate over such a wide bandwidth.
The log periodic dipole antenna presents a number of difficulties if it is to be fed properly. The feed impedance is dependent upon a number of factors. However it is possible to control this by altering the spacing, and hence the impedance for the feeder that connects each of the dipole elements together. Despite this the impedance varies with frequency, but this can be overcome to a large extent by making the longer elements out of a larger diameter rod. Even so the final feed impedance does not normally match to 50 ohms on its own. It is normal for a further form of impedance matching to be required. This may be in the form of a stub or even a transformer. The actual method employed will depend to a large degree on the application of the antenna and its frequency range.
The log periodic antenna can exist in a number of forms. The most common is the log periodic dipole array (LPDA). It basically consists of a number of dipole elements. These diminish in size from the back towards the front, the front most elements being the feed point, but may require connection via a matching stub or balun transformer. The main beam of this RF antenna coming from the smaller front. The element at the back of the array where the elements are the largest is a half wavelength at the lowest frequency of operation. The element spacings also decrease towards the front of the array where the smallest elements are located. In operation, as the frequency changes there is a smooth transition along the array of the elements that form the active region. To ensure that the phasing of the different elements is correct, the feed phase is reversed from one element to the next.
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