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A system is proposed to generate vortex electromagnetic (EM) beams in the microwave band, which generates high-order vortex beams at the X-frequency band for the first time. First, the orbital angular momentum (OAM)-generating system is designed and the signal model based on the uniform circular array is presented. Subsequently, the mathematical model with array error contributions is established...
Recently, much attention has been focused on the vortex electromagnetic (EM) beam, which carries orbital angular momentum (OAM), at radio and radar frequencies. In this paper, radiation pattern synthesis methods for the generation of vortex EM beam based on uniform circular array (UCA) are proposed. Directional elements and concentric-ring arrays are effectively exploited to optimize the radiation...
In this paper, a uniform circular array (UCA) is exploited to generate vortex electromagnetic (EM) beam, which carries orbital angular momentum (OAM). The basic generation method of OAM-carrying beam is presented firstly. Subsequently, the mathematical model with array error contribution is established and comprehensively numerical experiments are conducted to analyze how amplitude and phase errors...
Electromagnetic (EM) waves carrying orbital angular momentum (OAM) has special spatial helical wave front. However OAM-carrying beam generated by uniform circular array is not in a pure OAM state. This paper firstly analyzes the origin of superposition for OAM-beam generating, then pure OAM mode distribution is analyzed in local region. Based on orthogonality property of OAM modes, Fast Fourier transform...
In this paper, different array configurations are designed to generate OAM-carrying beams. Based on the array configuration, the corresponding excitation signals for all elements are presented. Comprehensive numerical experiments are conducted to analyze the influences of the array configuration on the generated field. Results indicate that hexagon and rectangle arrays can be readily exploited to...
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