Análisis del impacto de la frecuencia de resonancia en los parámetros de dispersión de antenas LPDA para la banda MMW

Abstract

This article analyzes the behavior of LPDA (Logarithmic Periodic Dipole Arrangement) antennas when resonant at millimeter wave (MMW) band frequencies. The antennas work at the frequencies of 60, 67 and 74 GHz, complying with a reflection coefficient (S11) lower than -20 dB, a Voltage Standing Wave Ratio (VSWR) comprised in a range of 1 to 2 and radiation patterns without null in its main lobe. The simulations were carried out in the ANSYS HFSS software, which allows the design of high-frequency antenna structures in 3D. When working at high frequencies, antennas of approximately 3mm were obtained, which is why it is recommended to work with printed type antennas. For the design of the antennas, silver was used as the conductive material for the dipoles. Because it has better electrical conductivity and a Duroid 5880 substrate that has low electrical permittivity and tangential loss. This allowed obtaining gains greater than 7.5 dB and bandwidths above 1.2 GHz.