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Antipodal Vivaldi Antenna with Dielectric Director for UWB Radar Applications

Rabiaa Herzi, Hsan Zairi and Ali Gharsallah

Unit Research in High Frequency Electronic Circuits and Systems, Faculty of Mathematical, Physical and Natural Sciences of Tunis, Tunis El Manar University, El Manar 2092, Tunis, Tunisia


Abstract: This paper demonstrates an antipodal Vivaldi antenna with dielectric director to be used for UWB (ultra-wideband) radar applications. In order to ameliorate the radiation characteristics of the antipodal Vivaldi antenna, a dielectric director with higher permittivity is implanted at the end of the antenna aperture which can drive the radiating waves in its direction and reduce the dispersion of waves. This configuration has the ability to produce good input match, high gain low dispersion, narrow beam width, small side lobe level and constant radiation pattern with a gain of 10 ± 2 dB over the operating bandwidth. Addition of a director which consists of a rod portion of a higher dielectric constant material improved the antenna performance.

Key words: Component, AVA (antipodal Vivaldi antenna), UWB (ultra-wideband), radar applications, dielectric director.
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