Abstract
This paper introduces an improved shape of Antipodal Vivaldi Antenna from the normal schematic structure which yields a high radiation gain. We have designed and fabricated the improved structure of Antipodal Vivaldi Antenna with the help of new dielectric substrate ASTRA®MT77 material. We have chosen a unique substrate material to develop our novel Antipodal Vivaldi Antenna because most research has been done on commonly used materials like FR4, RT Duroid, etc. Moreover, ISOLA has significantly good electrical and nonelectrical properties as compared with other substrate materials. The results of the desired antenna were simulated through extensive simulations performed in CST Microwave Studio®. The characteristics of all the antenna parameters are clearly studied and we are successful to achieve closed results between designed as well as experimented Vivaldi Antenna. The simulated antenna achieved a maximum gain of more than 9 dBi whereas the experimental antenna reached around 7 dBi between the operating frequency range from 1 GHz to 13 GHz. The measured prototype antenna provides linear polarization with overall radiation efficiency of more than 90%.
Highlights
The Vivaldi Antenna was first described and characterized in 1979 by Gibson [1]
The antipodal slot line suggested by Gazit [2] referred to as symmetric double-sided slot line was constructed with microstrip feed as an input feed
To increase the performance of the antenna the slot line was used as a radiation mechanism and paired-strip improves the transition region
Summary
The Vivaldi Antenna was first described and characterized in 1979 by Gibson [1]. Later, the antipodal slot line suggested by Gazit [2] referred to as symmetric double-sided slot line was constructed with microstrip feed as an input feed. Noronha et al [3] used this idea to construct a Vivaldi Antenna and have shown good results over a wide frequency range by maintaining a transition region from three to five wavelengths long distance to avoid a discontinuity between a feed and the radiating regions. With increasing interest in UWB as viable radio architecture, the Vivaldi Antenna has attracted interest due to its theoretically infinite bandwidth. It is a directional antenna with end-fire characteristics [12, 13]
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