Wide Band Antenna with Ultra-smooth Spectral Characteristics

Authors

  • Agaram Raghunathan Electronics Engineering Group Raman Research Institute Bangalore, India
  • B. S. Girish Electronics Engineering Group Raman Research Institute Bangalore, India
  • R. Somashekar Electronics Engineering Group Raman Research Institute Bangalore, India
  • K. S. Srivani Electronics Engineering Group Raman Research Institute Bangalore, India
  • Saurabh Singh Astronomy and Astrophysics Group Raman Research Institute Bangalore, India
  • Ravi Subrahmanyan Astronomy and Astrophysics Group Raman Research Institute Bangalore, India
  • N. Udaya Shankar Astronomy and Astrophysics Group Raman Research Institute Bangalore, India
  • Mayuri Sathyanarayana Rao Astronomy and Astrophysics Group Raman Research Institute Bangalore, India
  • Jishnu Nambissan T Astronomy and Astrophysics Group Raman Research Institute Bangalore, India

Keywords:

Antenna, cosmic microwave background radiation

Abstract

Understanding the evolution of Universe is, in the forefront of, the modern day observational cosmology. It requires precise and accurate measurement of cosmological signal, orders of magnitude weaker than the bright sky background. Detection of such a signal having distinct spectral signature, needs an antenna with frequency independent characteristics over more than an octave bandwidth. A spherical monopole antenna has been designed to operate in the frequency range 50-200 MHz with a spectral smoothness of about few parts in 104. The structure has been modeled and optimized using WIPL-D, to minimize spectral features arising out of abrupt reflections of surface currents and frequency dependent radiation patterns. A prototype has been built to validate the design. This paper presents the methodology adopted in the overall antenna design, experiences in its prototyping and simulation and the measurement results.

References

J. R. Pritchard, and A. Loeb, “21 cm cosmology in the 21st century,” Reports on Progress in Physics, 75, 086901, 2012.

C. Kim, K. T. Kim, Y.-K. Yoon, and J. K. Kim, “Spherical Super Wideband (SWB) Monopole Antenna with Micromachined Tapered Feeding Line,” IEEE Antennas and Propagation Society International Symposium, pp. 226-227, 2013.

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Published

2020-11-07

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Section

Articles