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Observational Techniques of Radio Astronomy and Radio Sciences SUMMARY: History and relevance of radio astronomy. Types of radio telescopes, arrays and receivers. Hertz Dipole. Radiation pattern and descriptive parameters of an antenna. Basic parameters of a radio telescope; antenna theory concepts. Fundamentals of radiative processes, propagation and polarization of electromagnetic waves. Absorption by Earth’s atmosphere. Measures of efficiency and sensitivity of radio telescopes. Interferometric arrays, aperture synthesis and calibration. VLBI principles. Continuum and spectral line receivers. Infrared sensors, materials, filters, Terahertz detectors.