Dielectric leaky-wave antennas have been interesting topics for its high beam-scan ability at millimeter wave frequencies as well as the characteristics of low loss, lightweight and easy fabrication. In previous studies, p-i-n diodes were attached to the metal strips [1] or on the side walls of the guide [2] for switchable main-beam angles at a fixed frequency operation. Recently, moveable grating film on the image line antenna was demonstrated [3]. This antenna system has a wide scan angle which is asymmetrical to the broadside beam. A dual-beam grating antenna was introduced later with wide and symmetrical beam-steering angle to the broadside [4], but required two beamports and a microwave combiner to combine CW power passing through the beamports.
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