A compact antipodal Vivaldi antenna (AVA) with the dimension of 42×36×1.6 mm 3 is proposed in this letter. Structural modifications in the radiating fins have increased the electrical length thereby reducing the lower operating frequency from 5.2GHz to 3.7 GHz. Proposed antenna maintains -20dB co polarization to cross polarization ratio throughout the operating bandwidth. The prototype is fabricated and the measurement results are presented to validate the performance of the proposed AVA.Index Terms-balanced antipodal Vivaldi antenna, tapered slot antenna, radar cross section, impedance bandwidth.

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Nanostructured ZnSe (Q-ZnSe) films synthesized by a wet chemical route have been studied. The evolution of particle size dependent strain, morphology and luminescence properties have been investigated, using x-ray diffraction, atomic force microscopy, transmission electron microscopy and optical absorption and luminescence spectroscopy. It is shown that the degree of structural orientation, self-organization and the nature of strain are dependent on particle size. Self-organized Q-ZnSe films with narrow particle size distribution have been successfully synthesized. Systematic particle size dependent blue shifts in the optical absorption edge and PL maxima have also been reported.

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