Construction of Slow and Fast Field Antenna for Detecting Lightning Strikes in South Sumatera

Two antennas - a slow-field antenna and a fastfield antenna - are constructed to measure the electric field generated by lightning. A 50-ohm RG-58 coaxial cable connects each antenna to a high-speed buffer circuit. The OPA633 is utilized in both buffer circuits, which have identical designs. The only difference between the two buffer circuits is the buffer capacitance value, which is 15 pF for the fast field and 10 nF for the slow field. The electric field measured by this circuit represents the electric field strength normal to the ground. Both buffer circuits function well up to frequencies of 100 kHz for the slow field and 1 MHz for the fast field, according to the test findings and circuit simulation with NI MULTISIM 13.0. This measuring equipment has successfully captured electromagnetic waves from lightning with noise levels as low as 180 mV.