What are the advantages of log periodic antenna?

Benefits or advantages of Log Periodic Antenna The wide bandwidth is great advantage of this antenna compare to YAGI and other antenna types. ➨Low to moderate gains can be obtained. ➨It offers uni-directional and bi-directional radiation patterns. It is highly directional antenna.

What are the applications of log periodic antenna?

Log periodic antenna applications

• HF communications: Log periodic antenna arrays are often used for diplomatic traffic on the HF bands.
• UHF Terrestrial TV: The log periodic antenna is sometimes used for UHF terrestrial television reception.
• EMC measurements: EMC is a key issue for all electronic products.

What is the difference between Yagi and log periodic antenna?

Both Log-Periodic Antennas and Yagi antennas are high gain directional antennas. The main difference between these antennas is that Log-Periodic Antennas support wider frequency bandwidths and are physically much larger than Yagi antennas. Conceptually, Log-Periodic Antennas are similar to Yagi Antennas.

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.

Why is a log periodic antenna known as frequency independent antenna?

Explanation: Log periodic antenna is frequency independent. The geometrical structure of the antenna changes according to the wavelength. It is also called as Frequency Independent antenna. Its electrical performance is dependent on logarithmic of frequency only.

How does log periodic antenna work?

Short wave broadcast antennas The log periodic is commonly used as a transmitting antenna in high power shortwave broadcasting stations because its broad bandwidth allows a single antenna to transmit on frequencies in multiple bands. The log-periodic zig-zag design with up to 16 sections has been used.

Who invented the log periodic antenna?

Dwight Isbell
Log-periodic antenna/Inventors
As the frequency shifts upward, the active region shifts forward. The upper frequency limit of the antenna is a function of the shortest elements. Log periodic designs vary, but the one most commonly used for EMC work is the Log Periodic Dipole Array (LPDA) invented by D.E. Isbell of the University of Illinois.

What are characteristics of log periodic antenna?

Being log-periodic, the antenna’s main characteristics (radiation pattern, gain, driving point impedance) are almost constant over its entire frequency range, with the match to a 300 Ω feed line achieving a standing wave ratio of better than 2:1 over that range.

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