A log-periodic antenna is a broadband self-tuning antenna. The log
periodic antenna consists of a number of parallel
active elements arranged in order of length, with the shortest
at one end and the longest at the other.. At
the lowest frequency of operation, the longest element is resonant,
and all other elements act as directors. At the highest
frequency, the shortest element resonates and the other (longer) elements
act as reflectors In the middle of the frequency band,
one of the other elements h is resonant; elements shorter
than the resonant element act as directors; and elements longer
than the resonant element act as reflectors.
The log periodic antenna is often used as an HF antenna or
a VHF antenna, depending on the lengths of its elements.
Other topics in our resources on Antennas related to Log Periodic Antenna include: