Broadband Calculable Dipole Antennas for SIL Measurements of CALTS

Abstract

Calibration Test Sites (CALTS) are utilized to calibrate horizontally polarized antennas which are used in EMC tests and electromagnetic pollution measurements in the frequency range 30 MHz to 1000 MHz. In order for an established site to be accepted as CALTS, it must be verified by the use of precise and calculable dipole antennas compatible with the CISPR 16-1-5 standard. The relevant parameters of the dipole antenna and the measurement method are described in the CISPR 16-1-5 standard. In this paper, the design, the production and the performance measurements of a pair of calculable dipole antennas with a 3-dB hybrid balun to be employed in Site Insertion Loss (SIL) measurements of a CALTS in the frequency range of 30 MHz – 1000 MHz are presented. A CALTS whose dimensions are 30mx60m will be established at TÜBITAK UME. In addition, the parameters of the manufactured dipole antennas with the 3-dB hybrid balun defined in the CISPR 16-1-5 standard are measured using a special calibration adapter designed by us. Finally, theoretical SIL values are calculated with software for all measurement frequencies by using the measured parameters of the dipole antennas with the 3-dB hybrid balun.