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In this paper, a printed Vivaldi antenna with two pairs of eye-shaped slots is proposed for UWB applications. By using two pairs of eye-shaped slots, the side lobe levels of the radiation pattern are reduced, and the antenna gain is improved at low frequencies. To illustrate the efiectiveness of the proposed design, a prototype of the proposed antenna is fabricated and measured. Experimental results show that the proposed antenna presents a measured impedance bandwidth, deflned by jS11j < i10dB, from 3 to 12.8GHz with a compact size (36mm£36mm). Good unidirectional radiation characteristics with a front-to-back ratio better than 10dB are also achieved. The measured gain is better than 3.7dBi in the operating frequency band. In addition, the measured group delay of the proposed antenna is around 1.2ns with a variation less than §0:5ns.

A PRINTED VIVALDI ANTENNA WITH IMPROVED RADIATION PATTERNS BY USING TWO PAIRS OF EYE-SHAPED SLOTS FOR UWB APPLICATIONS