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High Gain Vivaldi Antenna for Radar and Microwave Imaging Applications

G. K. Pandey, H. S. Singh, P. K. Bharti, A. Pandey, and M. K. Meshram
Department of Electronics Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, India
Abstract—An Ultrawideband (UWB) high gain compact Vivaldi antenna with end fire radiation patterns is presented for radar and microwave imaging applications. The antenna is operating for 2.9GHz to more than 11GHz with -10dB impedance bandwidth and is designed on low cost FR4 substrate of thickness 0.8mm. While designing the proposed antenna, initially a compact exponential tapered slot Vivaldi antenna is presented for wide impedance bandwidth performances. Further, the Vivaldi antenna is modified by incorporating corrugations on the edges of exponential metallic flaring section and some periodic grating elements consists of small metallic strips on the slot area, which results in improvement in gain significantly along with increased directivity and lower frequency band coverage. The proposed antenna shows nearly stable end-fire radiation patterns throughout the frequency range. The surface current distributions and input impedance plots are presented to understand the antenna mechanism.

Index Terms—vivaldi antenna, end-fire, microwave imaging, ultrawideband (UWB), radar

Cite: G. K. Pandey, H. S. Singh, P. K. Bharti, A. Pandey, and M. K. Meshram, "High Gain Vivaldi Antenna for Radar and Microwave Imaging Applications," International Journal of Signal Processing Systems, Vol. 3, No. 1, pp. 35-39, June 2015. doi: 10.12720/ijsps.3.1.35-39
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