Redução do nível de lóbulos laterais em arranjo de antenas 1D

• Autor(a) principal: Souza, Bruna Dias Pires de [UNESP]
• Data de Publicação: 2018
• Tipo de documento: Trabalho de conclusão de curso
• Idioma: por
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://hdl.handle.net/11449/203128; http://www.athena.biblioteca.unesp.br/exlibris/bd/capelo/2019-03-19/000912960.pdf
• topic: Análise numérica; Antenas (Eletrônica); Sistemas de comunicação sem fio; Telecomunicações; Antennas (Electronics); Numerical analysis; Telecommunication; Wireless communication systems

Array antennas have been widely proposed to improve radiation features and to enable dynamic control of the radiation pattern through beam steering and beam forming, which are required in state-of-the-art wireless communication. However, in ultra wideband applications, as well as in photonic systems, the minimum separation distance between radiation elements is limited to several wavelengths, leading to the presence of strong side-lobes known as grating lobes. These grating lobes represent a critical impairment that prevents the adoption of these sparse array antennas in applications where crosstalk and security faults must be avoided. In this work, we numerically analyze, for the first time to our knowledge, the side-lobe level (SLL) reduction of 1D sparse antenna arrays under beam steering operation when the radiating elements are arranged non-uniformly (the separation between radiation elements is increased geometrically). The proposed method has a single parameter and, therefore, can be easily optimized and extended to higher dimensions. Numerical results reveal a SLL reduction, in the worst-case scenario (steering angles close to =2), of approximately 5 dB for a 5-element array with a total length of 6 wavelengths