A Compact Antipodal Vivaldi Antenna for UWB Applications

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 5.2 GHz to 3.7 GHz. Proposed antenna maintains -20 dB copolarization 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.