The booster coils are used to generate highest field strengths in conjunction with a high power balun (e.g. VHBD 9134-4 or VHBD 9134) and radiating elements (e.g. BBAL 9136 or BBAE 9179) in the frequency range from 20 MHz to approx. 60 MHz. This frequency range has usually very high demands for amplifier power, since the antennas are small compared to the wavelength, their efficiency is low and the impedance matching is poor, which degrades the total efficiency of the immunity test system. A possible solution is the use of booster coils, which are placed between the balun’s symmetrical terminals and the radiating elements. This increases the overall dimensions of the radiating elements by 14 cm only, but the electrical size increases significantly, which results in a better impedance matching and a remarkable increase of achievable field strengths. Although there are significant improvements in the low frequency range obtained by the booster coils, it is not recommended to use them at higher frequencies. Depending on the antenna element in use, the maximum useful frequency of the booster coils is between 45 to 60 MHz.
| Frequency Range: | 20 – 65 MHz |
| Material: | CU / PTFE |
| Dimensions: | 40 x 42 x 109 mm |
| Insertion length: | 140 mm |
| Bolt diameter: | 10 mm |
| Clamp fixture diameter: | 10 mm |
| Weight: | ca. 310 g |
Datasheet BCOI 9180
Transmission measurements VHBD 9134 with BCOI 9180
