A Survey on Gain Optimization Techniques for Log- Periodic Antenna

Abstract

Log periodic dipole antenna is a special kind of array antenna where design parameters of each successive element are in logarithmic proportion with the preceding element. The main design parameters of LPDA are: spacing between elements, length and radius of an individual element. LPDAs are inherently broadband antenna. This paper gives insight on how to design a reference model using Carrel's method. The paper focuses on the study of different techniques used to date in order enhance the gain of LPDA. The techniques are divided into four type viz. space variation, addition of director element, shape variation and feed voltage variation techniques. The paper concludes with the advantages and drawbacks of each technique.