Benamraoui, AbdelhakGhozlane, Mohamed AnouarAzrar, ArabBencheikh, Mohammed Laid2024-10-102024-10-102024979-835035140-8https://ieeexplore.ieee.org/document/1062050610.1109/ITC-Egypt61547.2024.10620506https://dspace.univ-boumerdes.dz/handle/123456789/14344In this paper, a modified printed log periodic dipole array (MPLPDA) antenna based on multiple scaling factors for high gain and wide beam-width is presented. To improve the gain and broaden the beam while enhancing the impedance bandwidth, a design based on dividing the LPDA dipole elements into three groups with three scaling factors for each group is proposed. The -10 dB bandwidth of 1.36 GHz to 12.8 GHz is realized in addition to some high frequency sub bands. Furthermore a -7.3 dB bandwidth of 1.29 GHz to 18 GHz is achieved. The designed antenna is realized on F4B substrate with thickness of 1mm and a good agreement is noticed in the measurement of the input reflection coefficient and radiation patterns. The measurements show the UWB end-fire operation of the proposed LPDA with a maximum realized peak gain of 10.59 dBi. Moreover, the fabricated antenna maintains a realized gain values greater than 5 dBi and -3 dB beam-widths at both E and H plane wider than 58°in almost all L, S and C band frequencies. The proposed antenna can be used for ESM / ELINT systems by tilting it at an angle of 45°for high polarization receiving capability.enESM/ELINTImproved bandwidthModified LPDARealized peak gainUWB End-fire operationArticle