logarithmic periodic dipol array (LPDA)

Log.-Per.(LP) is an abbreviation for log-periodic. Lo.-Per. antennas (LPA) are logarithmic-periodic antennas, which are characterized by broadband and cover quite the VHF range and UHF range and parts of the microwave spectrum. Their frequency range extends from about 80 MHz up to 6 GHz. Log. per. antennas can be used as receive and transmit antennas and are also called log periodic dipole arrays (LPDA).

They consist of single, antenna elements of different lengths. The front, shorter elements are for higher frequencies, the rear, longer ones for the lower frequency ranges. The active zone is formed by three antenna elements tuned to half the wavelength. The other elements have higher or lower resonant frequencies.