LPDA antenna (log-periodic dipole arrays) is an extremely wide-band antenna with a simple structure and excellent performance. It is noted that the adjacent oscillator of the antenna is crossed and connected to the feeder, if the two sides of the trapezoidal tooth are folded together to form a coplanar structure with zero internal angles, the two antennas are similar. Since Isbell described the performance of LPDA in 1960, log-periodic dipole antennas have been widely used in short-wave, ultra-short-wave, microwave-wave, and other bands of communication, direction finding, search, electronic countermeasures, etc.


Advantages of LPDA Antennas

Advantages of LPDA Antennas
  • 1
    There are many types of log-period antennas, including log-periodic dipole antennas and unipolar antennas, log-periodic resonant V-shaped antennas, logarithmic-periodic spiral antennas, etc,and there are 2G/3G/4G/LPDA antennas. the most common of which is logarithmic-periodic dipole antennas.

  • 2

    As an ultra wideband antenna, the bandwidth coverage is very wide, the bandwidth can reach 10:1, often used for signal amplification, indoor distribution, and elevator signal coverage. In addition, the logarithmic periodic antenna can be used as a feed source for microwave reflective surface antennas. 

  • 3

    Since the active region moves with the change of operating frequency, the deviation of the active region from the focus in the entire operating frequency band must be within the allowable tolerance of the entire operating frequency band during installation.

Features of LPDA Antennas

Lpda antennas are based on the following similar concept: when the antenna is transformed by a certain scale factor τ and still equal to its original structure, the flat rate of the antenna is the same at f and τf. There are many forms of logarithmic periodic antennas, among which the log dipole antenna (LDPA) proposed in 1960, because of its extremely wide frequency band characteristics and relatively simple structure, so it was soon widely used in shortwave, ultrashortwave and microwave bands.

Features of LPDA Antennas