A highly directional Ultra-wideband (UWB) Vivaldi antenna is offered for the study of microwave imaging utilization and radar based technique. In this paper, a novel Vivaldi antenna is designed which improve the directivity, gain and bandwidth parameters of the antenna. Initially the desired performance is achieved by making some changing in the exponential tapered structure. Again some modifications are made in the top of the patch by adding some corrugations in the flaring section, so better performance improvement is obtained in the value of directivity, low frequency of operation, bandwidth and gain. The operating frequency of the tapered Vivaldi structure is 1.45GHz in the lower cut-off frequency whereas the upper cut-off frequency is 9.8GHz. The proposed corrugated Vivaldi antenna is fabricated using FR4 substrate prototype of the modified antenna is fabricated and experimentally studied as well.
To detect the presence of tumor in the breast, a miniaturized Ultra-wideband (UWB) antenna is simulated with the use of CST microwave studio. In free space, its operating range is about 3.548GHz. The Flame Retardant (FR-4) material is used as a substrate in the design of the microstrip antenna. The antenna has the dimensions of 16 x 20 mm. The improved bandwidth is obtained by making some modifications in the patch and ground plane. To improve the gain and directivity, an array of 2 x 2 elements are created. The improvement in gain and directivity is analyzed for different spacing between the elements like λ/2 and λ. The spacing of λ/2 between the elements created gives the improved directivity and gain.
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