Log-periodic antennas with in-phase currents


  • Boris M. Levin Holon Institute of Technology, Israel




antenna theory, directional antennas, numerical calculation


The approximate method of calculating directional characteristics of log-periodic antenna: directional patterns, directivity, and pattern factor is proposed. The analytical expressions are determined, and characteristics of antennas with straight metal dipoles and with in-phase radiators of the same dimensions are calculated. The advantage of using in-phase radiators is demonstrated. It is shown that the log-periodic antennas of radiators with in-phase current distribution allow to decrease the antenna length and to provide the high directivity in a wide frequency range. The problem of optimization of considered antennas by methods of mathematical programming is stated.


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General antenna theory, propagation, numerical and analytical methods