A disk-loaded thick cylindrical dipole antenna for validation of an EMC test site from 30 to 300 MHz

We propose a new broad-band, short (80-cm-long) disk-loaded thick cylindric al dipole (DTCD) antenna for validation of an electromagnetic compatibility (EMC) test site for the frequency range between 30-300 MHz. In order to ac hieve broad-band characteristics, we have chosen a thick dipole as DTCD ele ment. Disk loading has been applied to make this dipole shorter. To elimina te any ambiguity in balun characteristics, a commercially available hybrid junction is used as an antenna balun. Thus, the DTCD proposed in this paper is a very short, simple, and cell-defined broad-band antenna that covers t he frequency range between 30-300 MHz, The DTCD has an azimuthally. symmetr ical radiation pattern and, thus, is very well suited far the validation of an EMC test site, This paper presents the DTCD antenna characteristics suc h as input impedance, antenna gain, antenna factor, and classical site atte nuation, which are calculated by use of the method of moments (MoM). These theoretical antenna factors and classical site attenuations of the DTCD are compared with experiments over the frequency range of 30-300 MHz. They agr ee with each other to within fl dB in antenna factor and to within +/-2 dB in site attenuation. Our preliminary investigation indicates that an additi onal DTCD (25 cm long) can cover the frequency range of 300-1000 MHz, There fore, only two DTCD's will be needed for very accurate calculable classical site attenuation values in order to validate an EMC test site for the enti re frequency range between 30-1000 MHz.