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A log-periodic antenna (LP), also known as a log-periodic array or log-periodic aerial, is a multi-element, directional antenna designed to operate over a wide band of frequencies. It was invented by John Dunlavy in 1952.
An antenna whose impedance acts as the logarithmically periodic function of the frequency of operation is known as log periodic. Also, the electrical properties like radiation pattern, directive gain, beamwidth, beam direction also undergo similar periodic variation.
The Yagi-Uda antenna is mostly used for domestic purpose. However, for commercial purpose and to tune over a range of frequencies, we need to have another antenna known as the Log-periodic antenna. A Log-periodic antenna is that whose impedance is a logarithamically periodic function of frequency.
The log-periodic Dipole Array (LDPA) is a multi-frequency antenna composed of a series of driven elements parallel to each other.
Log Periodic (LP) dipole antenna arrays are explained. We discuss the basic idea behind the LP dipole array design, and then show a real world design.
The log-periodic antenna is a versatile and efficient design that offers a range of attractive features, such as wideband frequency coverage, consistent impedance, and directional radiation patterns.
To construct a log periodic antenna, one must first determine the maximum logarithm of frequency that must be received, and then determine the minimum number of dipole lengths or the shortest element required to achieve that frequency.
Log Periodic (LP) antennas are discussed and explained. The concept behind Log Periodicity and why this produces a wideband antenna is explained. Then we show the LP tooth antenna.
The log-periodic dipole array (LPDA) consists of a system of driven elements, but not all elements in the system are active on a single frequency of operation.
A log-periodic antenna, also referred to as a log periodic dipole array, is the most complex kind of antenna. It’s actually multiple antennas all together. In a log-periodic antenna, each one of the elements is actually wired up.