LCD Display Repeater Cell Phone Signa

                                                 Directional signal booster 4G  LPDA Antenna

1. Direction diagram and direction coefficient
The log-periodic antenna is an end-fire antenna, and the maximum radiation direction is the direction from the longest vibrator to the shortest vibrator along the collection line. When the working frequency changes, the radiation area of the antenna moves back and forth on the antenna to maintain similar characteristics, so the change of the pattern with the frequency is small. In addition to the pattern of the log-periodic antenna, its half-power angle also has a certain relationship with the geometric parameters τ and σ. the smaller the angle
At any operating frequency, only some oscillators in the radiation region play a major role in radiation, and not all oscillators have an important contribution to radiation, so its directionality is not strong. The beam width of the pattern is generally tens of degrees, and the directivity coefficient or antenna gain is generally about 10dBi, which belongs to the category of medium-gain antennas.Periodic Antenna vs Yagi

2. Polarization
Similar to directional antennas, log-periodic antennas are linearly polarized. When the dipole surface of the log-periodic antenna is placed horizontally, it radiates or receives horizontally polarized waves; when its dipole surface is placed vertically, it radiates or receives vertically polarized waves.Periodic antenna HF

3. Bandwidth
The radiation area of the log-periodic antenna has certain requirements on the length of the dipole, so its working bandwidth will be basically limited by the size of the longest and shortest dipoles.Log Periodic Antenna.