Radial Anwar

Compact multiband VHF antenna for transient radio telescope

Development of antenna for a radio telescope system has become a fascinating research area in the field of radio astronomy. In this paper, a design of compact multiband VHF antenna for a transient radio telescope system is proposed. The multiband has been achieved by combining V-shape half-wavelength dipole, traps and parasitic elements. Return losses of about −12.45 dB, −25.15 dB and −29.42 dB are obtained at three different frequencies, where the maximum gains are achieved at zenith direction for all operating frequencies. The proposed antenna is suitable to be used in a transient radio telescope which is operated in urban centers.

Development of a Multiband VHF Antenna for Low-Frequency Transient Radio Telescope

Low-frequency radio astronomy has become a fascinating research area in the field of astronomy, including on its instrumentation development. In this paper, a multiband VHF antenna for low-frequency transient radio telescope is developed. The multiband has been achieved by combining V-shape half-wavelength dipole, traps, and parasitic elements. Measurement result shows that the antenna can work properly in three different frequencies designated by International Telecommunication Union (ITU) for radio astronomical purposes.

Effect of Parasitic Element on 408 MHz Antenna for Radio Astronomy Application

Antenna is one of the important subsystem components in a radio telescope system. In this paper, analysis on the effect of parasitic element on 408 MHz antenna in a radio telescope system is presented. Higher gain up to 10.24 dBi with reduction on beamwidth size has been achieved by optimizing the position of parasitic element relative to the driven element. The proposed antenna is suitable to be utilized in a transient radio telescope array.

Antennas and propagation around the world: CALLISTO radio spectrometer construction at Universiti Kebangsaan Malaysia

The Compound Astronomical Low-Cost Low-Frequency Instrument for Spectroscopy and Transportable Observatory (CALLISTO) is a worldwide network of radio spectrometers designed for 24-hour solar observation. It is a collaboration among the Swiss Federal Institute of Technology Zurich and numerous local host institutes, spread out around the world. This paper presents an overview of the CALLISTO spectrometer system at the Universiti Kebangsaan Malaysia (UKM). The ?Malaysia-UKM? station is installed inside the campus area, at the Permata Pintar School building. In particular, this paper explains the details of the instruments setup, and reports some of the data observed from this station. The realtime data are available from the e-CALLISTO International Network of Solar Radio Spectrometers.

VERIFIKASI DESAIN ANTENA BERBASIS DIPOL BERBENTUK V UNTUK PENGAMATAN GARIS 21 CM

21 cm adalah salah satu garis emisi penting didalam astronomi radio. Garis ini umumnya digunakan untuk mempelajari karakteristik galaksi-galaksi. Artikel ini mempresentasikan sebuah antena dipol berbentuk V untuk sistem telekop radio 21 cm, yang berkorespondensi dengan frekuensi pengamatan 1420MHz. Designnya telah diimplementasikan dan diukur. Hasil pengukuran memperlihatkan kesesuaian dengan simulasi, dengan eror frekuensi puncak sebesar 0,7%. SWR yang diperoleh juga cukup rendah, yaitu sekitar 1,14. Antena yang diajukan pada artikel ini berpotensi untuk digunakan sebagai feed pada antena reflektor atau sebagai elemen penyusun pada sebuah sistem antena array.