Simulasi dan Perancangan Septum pada Gigahertz Transverse Electromagnetic (GTEM) Cell dalam Pengujian Radiated Emision

Abstract

Gigahertz Transverse Electromagnetic Chamber (GTEM) cell is a solution for testing radiated immunity and emission from electromagnetic interference devices. The septum of GTEM cell which acts as a radiation receiving antenna, the seuptum is designed with micro periodic dipole array (LPDA) microstrip antenna method. Before being implemented hardware, septum characteristics such as return loss, VSWR and the resulting gain are optimized by simulation. The design of the LPDA antenna method uses special specifications with parameters Ï„ = 0.871 and σ = 0.161 to get gain = 7 dB.Septum is designed on the Ultra Wideband (UWB) frequency with a range of 300 MHz - 1 GHz. The substrate material used is FR4, with a dielectric constant of 4.6 and a thickness of 1.6 mm. The parameters produced from the results of this septum are return loss below -10 dB at frequency  300 MHz - 1 GHz, with the lowest return loss value is -60.34 dB at 682.2 MHz and VSWR> 2 at a frequency of 300 MHz - 1 GHz The lowest VSWR is 1.104 at a frequency of 552 MHz. From the measurement results obtained a gain of 8.4 dBi with directional polaradiation type. Septum was designed to successfully carry out radiation measurements on the EMI source and smartphone.