An Evaluation Performance of Log Periodic Dipole Antenna Based on the Parameter of Flux Density of the Solar Radio Burst Event

摘要

In this work, an evaluation of the flux density of the solar radio burst is analyzed. We used a nineteenth (19) elements of rod aluminums' type as a conductor with of different sizes is being prepared to construct a log periodic dipole antenna (LPDA) from 45 - 870 MHz. The testing was carried out at the National Space Agency (PAN), Sg. Lang, Banting Selangor by connecting to the Compound Low Cost Low Frequency Spectroscopy Transportable Observatory (CALLISTO) spectrometer. We choose the input impedance, R_0 = 50 ohm for this LPDA antenna. From the analysis, the gain of the antenna is 9.3 dB. This antenna possibly captures a signal that covers about 0.08 m2 area of the Sun. It was found that the temperature of the burst that detected at the feed point of the antenna is 32 K. However, the signal becomes decrease to 28.75K while by the CALLISTO spectrometer as a receiver. We found that the isotropic source spectral power is 1576 W/Hz. Since the burst level above the background sky is 0.41 dB, the flux density of the burst is 5.5 × 10~(-21) W/m~2/Hz. We conclude that this antenna is suitable for to observe the Sun activities at low frequency region.