Navegando por Autor "Peixeiro, Custódio"

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Effects of an FSS reflector on a microstrip line fed bow-tie slot antenna
(Scielo, 2020-09-16) D´Assunção, Adaildo Gomes; Peixeiro, Custódio; Brito, Augusto César Rebouças de; Abreu, Antonio Salvio de
This paper describes the analysis of the effects of a frequency selective surface (FSS) on the characteristics of a microstripline fed antenna with a bow-tie slot in the ground plane for operation in the frequency range 1 to 10 GHz. The use of the FSS is proposed to miniaturize the antenna structure and increase the number of resonance frequencies and the gain. Air gaps can be inserted between the antenna and the FSS to allow for the adjustment of the resonance frequencies and increase the bandwidth. To prove the concept, antenna prototypes printed on a 30×30 mm2 FR4 low-cost substrate are designed, fabricated and tested. Good agreement is obtained between numerical simulations and experimental results, thus validating the proposed design procedure. The obtained miniaturization and multiband effects can be most convenient for multiservice wireless system applications such as WLAN, WiMAX, 4G, and 5G mobile communication systems
Miniaturization of a microstrip patch antenna with a koch fractal contour using a social spider algorithm to optimize shorting post position and inset feeding
(Hindawi, 2019-05-02) D´Assunção, Adaildo Gomes; Souza, Eduardo A. M.; Oliveira, Phelipe Sena; Mendonça, Laércio Martins de; Peixeiro, Custódio
This paper presents a social spider optimization (SSO) design of a small-size microstrip antenna. Two antenna miniaturization techniques, based on the use of a Koch fractal contour and a shorting post (connecting the patch to the ground plane), are combined to enable a major size reduction. The antenna is inset fed by a microstrip line. The developed SSO algorithm is used to find out the best radius and position of the shorting post and the length of the inset feed, to achieve the desired resonant frequency with good impedance matching. Antenna prototypes have been fabricated and measured. The good agreement obtained between numerical simulation and experimental results has validated the design procedure. Compared with a conventional rectangular patch, the antenna resonance frequency is reduced from 2.45 GHz to 730 MHz, which corresponds to a remarkable miniaturization of about 70%. The proposed antenna is suitable for applications in the 700-800 MHz frequency range, such as 4G mobile communication systems

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Navegando por Autor "Peixeiro, Custódio"