Abstract
In this paper, a modifled planar balanced Vivaldi antenna with endflre characteristics near the metal surface is proposed for 6{18GHz applications. The proposed antenna structure consists of three copper layers, among which two external layers locate on the two outsides of two dielectric substrates, and the central layer is sandwiched by these two dielectric substrates. To further enhance the end-flre radiation characteristic, a number of novel techniques are proposed, including elongation and shaping of the supporting substrate of a conventional balanced antipodal Vivaldi antenna beyond its aperture, using an I-shaped slot loaded radiation patch and cutting a triangle on the edge of three copper layers. Measured and simulated results show that the proposed antenna not only exhibits good impedance bandwidth, but also improves the end-flre performance in the operational frequency of 6{10GHz and achieves high gain in the end-flre direction, low cross-polarization and high front-to-back (F-to- B) ratio.
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