Antenna design and implementation for the future space Ultra-Long wavelength radio telescope |
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| Authors: | Linjie Chen Amin Aminaei Leonid I Gurvits Marc Klein Wolt Hamid Reza Pourshaghaghi Yihua Yan Heino Falcke |
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| Institution: | 1.Key Laboratory of Solar Activity,National Astronomical Observatories of Chinese Academy of Sciences,Chaoyang District,China;2.Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics,Radboud University,Nijmegen,The Netherlands;3.Joint Institute for VLBI ERIC,Dwingeloo,The Netherlands;4.Department of Physics,University of Oxford,Oxford,UK;5.Department of Astrodynamics and Space Missions,Delft University of Technology,Delft,The Netherlands;6.Electronic Systems Group, Department of Electrical Engineering,Eindhoven University of Technology,Eindhoven,The Netherlands;7.Netherlands Institute for Radio Astronomy (ASTRON),Dwingeloo,The Netherlands |
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| Abstract: | In radio astronomy, the Ultra-Long Wavelengths (ULW) regime of longer than 10 m (frequencies below 30 MHz), remains the last virtually unexplored window of the celestial electromagnetic spectrum. The strength of the science case for extending radio astronomy into the ULW window is growing. However, the opaqueness of the Earth’s ionosphere makes ULW observations by ground-based facilities practically impossible. Furthermore, the ULW spectrum is full of anthropogenic radio frequency interference (RFI). The only radical solution for both problems is in placing an ULW astronomy facility in space. We present a concept of a key element of a space-borne ULW array facility, an antenna that addresses radio astronomical specifications. A tripole–type antenna and amplifier are analysed as a solution for ULW implementation. A receiver system with a low power dissipation is discussed as well. The active antenna is optimized to operate at the noise level defined by the celestial emission in the frequency band 1 ? 30 MHz. Field experiments with a prototype tripole antenna enabled estimates of the system noise temperature. They indicated that the proposed concept meets the requirements of a space-borne ULW array facility. |
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