Determination of Isotropic Source Spectral Power of the Log Periodic Dipole Antenna (LPDA)

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Year:
2014
Type of Publication:
Article
Keywords:
CALLISTO Compound Low Cost Low Frequency Spectrometer, Log Periodic Dipole Antenna LPDA, Power Flux Density, Isotropic Source Spectral Power, and Solar Radio Burst
Authors:
Z. S. Hamidi; N. N. M. Shariff
Journal:
IJISM
Volume:
2
Number:
1
Pages:
31-33
Month:
January
Abstract:
This article aims to present the significant role of several parameters of a Log Periodic Dipole Antenna (LPDA) to perform a better observation of solar radio burst. This antenna is constructed with (19) elements of different sizes covers from 45 MHz to 870 MHz. The performance of the antenna was carried out at the National Space Agency (PAN), Sg. Lang, Banting Selangor by connecting to the CALLISTO spectrometer. We use an input impedance, R0 = 50 Ω for this LPDA antenna. Since the burst level above the background sky is 0.41 dB, the flux density of the burst is 5.5 x 10-21 W/m2/Hz. Based on the analysis, the gain of the antenna is 9.3 dB. This antenna potentially 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. Nevertheless, the signal becomes decrease to 28.75 K while by the CALLISTO (Compound Low Cost Low Frequency) spectrometer as a receiver. The isotropic source spectral power is 1576 W/Hz. We conclude that this antenna is appropriate to observe the Sun activity at low frequency radio region.

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