How does a log periodic antenna work?
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. Electrically, it simulates a series of two or three-element Yagi antennas connected together, each set tuned to a different frequency.
What do you mean by log periodic antenna?
A log-periodic antenna is an antenna that can operate on a wide frequency band and has the ability to provide directivity and gain. It has radiation and impedance characteristics that are repeated as a logarithmic function of excitation frequency. These antennas are fractal antenna (self-similar antenna) arrays.
What are the three regions of log periodic antenna?
There are several type of log-periodic antennas such as the planar, trapezoidal, zig-zag, V-type, slot and the dipole. The mostly used one is log-periodic dipole array, in short, LPDA. The diagram of log-periodic array is given above.
What is the use of LPDA antenna?
The log periodic antenna or aerial often called the LPDA is a wideband directional antenna that provides gain and directivity combined over a wide band of frequencies. Directive antennas like the Yagi provide gain and directivity but their bandwidth is limited.
What is log periodic antenna radiation pattern?
The radiation pattern of log periodic antenna is unidirectional and the main lobe is along the axis of the boom [7]. Array of dipole antenna is fed with equal and opposite phase. All dipole elements are fed with successive elements out of phase and radiates in end fire direction.
How far can LPDA antenna reach?
Paddle antennas (LPDA) typically offer about 5dB and Helical antennas about 9dB. There are even specialty Yagi antennas that can offer even more. Team that up with better quality, low loss coax such as RG8x/LMR-195 for runs up to 100 feet or LMR-400 for even further and you may well have solved the problem.
Which is better Yagi or LPDA?
Because it has many dipole elements of different lengths, an LPDA antenna can transmit and receive across a wide range of frequencies. A Yagi antenna is designed to operate in a very narrow frequency range with higher gain.