The Horn Antenna as Gaussian Source in the mm-Wave Domain
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Rising progress of mm-wave technology in spectroscopy, remote-sensing and its prospective application in communications requires accurate radiation beam characterization in quasi-optical systems. Gaussian approximation is a well-known practical model at optical and infrared wavelengths, and here we try to show the performance and limits of this method for the horn antenna as a classical mm-wave radiation source. This approach provides a compact and more practical analytical tool to design and optimize quasi-optical systems, compared to electromagnetic (EM) full-wave solutions. The radiation pattern (beam shape) and the phase distribution are studied analytically, both with the EM full-wave method and Gaussian approximation. Comparative results with measurements are presented to verify the analytical process and show the feasibility of the method for conventional horns.
Keywordsmm-Waves Horn antennas Gaussian beams Radiation pattern Wave-front Quasi-optical systems
The authors would like to thank an anonymous reviewer for improving the quality of the paper. This work has been conducted within the EMRP joint research project “NEW07 Microwave and terahertz metrology for homeland security”. The EMRP is jointly funded by the EMRP participating countries within EURAMET and the European Union.
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