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The propagation direction is one of the key parameters of an air shower. In this study we introduce a new and unique approach to determine propagation direction of an air shower based on filtered peak radio amplitudes which can shape radio signal patterns. For this purpose, a series of simulations were performed with CORSIKA and CoREAS software. Simulated air showers initiate from Proton and Iron primary particles with 10 17 eV energy and have different zenith angles from vertical to 60°. Time based results were converted and analyzed using a specially designed computer code to calculate the peak radio amplitudes of different electric field components (, ,) in the 32-64 MHz frequency band. We investigate four different shower propagation directions including North-South and East-West orientations in this paper. It is found that the radio signal patterns of different electric fields components especially the North and Vertical Components can be used to determine an air shower propagation direction accurately. This new technique is especially useful for inclined air showers where the impact of an air shower propagation direction is very prominent on its radio signal patterns.

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