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A printed Log-periodic dipole array (LPDA) is presented, over the C, X and Ku bands. The antenna feeding structure of two coaxial cables, in order to realize an in ̄nite balun provides the required broadband input matching. The second cable mirrors the ̄rst one, connected to the antenna input, is capable of both stabilizing the antenna phase center and the radiation pattern. The antenna has been designed using Microwave Studio, with an useful frequency range of 4{18 GHz. , both simulated and measured results show that the proposed can be successfully used as an Ultra Wideband Antenna in the 4.25{13.25 GHz, in which its phase center remains stable.
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Casula et al. (2013) studied this question.
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