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: