The Variation of E Field Pattern and H-Field Radiation Pattern of Log Periodic Dipole Antenna at Universiti Teknologi MARA

Abstract

AbstractA log-periodic dipole antenna (LPDA) is a very important tool for radio observations of the sun. As mentioned in Surah Ash-Shams, “By the Sun and its brightness”, sunlight is not just an essential prerequisite for life but also can be used in many modern applications. In this study, LPDA was constructed as part of the e-CALLISTO system at Universiti Teknologi MARA. The antenna has 17 elements and operates over a wide frequency range. In addition, each spacing of the elements corresponds to a specific frequency to detect the solar burst. A distance of 4361 mm is possible when the element size ranges from 161 to 1875 mm. Due to interference and site conditions, not all elements are active at the same frequency. The antenna is located near the Center of Astrophysics and Applied Radiation laboratory in the Faculty of Applied Sciences. Starting at 500 MHz, the E and H fields are varied by 100 MHz. In addition to its thermal environment, the LPDA’s gain pattern influences its temperature. The solar burst here is observed with a meter-wavelength antenna. With the use of LPDAs, solar bursts can be measured with high spectral resolution. LPDA was simulated using EZNEC software under free-space conditions. Based on the results, we explored simulations of LPDA antennas at 500 MHz and 1000 MHz, respectively. Refraction and weather are also important factors in determining how the H-field and E field vary. In order to track the position of the Sun, it has been suggested to use a motor to rotate the antenna vertically.KeywordsSunLog periodic dipole antenna radio regionAntennaTemperatureRadar cross section