New results on tapered slot endfire antennas on dielectric substsates

Tapered slot endfire antennas for millimeter wave single beam and imaging applications have been investigated systematically. Gain, beamwidth, efficiency, coupling impedance and bandwidth have been determined experimentally for various shapes, such as linearly tapered (LISA), exponentially tapered (Vivaldi) and constant width (CWSA). Substrates of both high and low dielectric constants have been included. This class of antenna elements appears very attractive for a number of applications, and is easy to fabricate.