We have proposed a novel structure of frequency-independent steerable composite right/left-handed (CRLH) leaky wave (LW) antenna in the millimeter-wave band. It has advantages of wide beam scanning. The proposed antenna has features that a movable dielectric slab is placed above the CRLH LW antenna, and the radiation angle can be steered by changing the distance between the slab and the antenna using compact actuators. We have fabricated the prototype of CRLH LW antenna with the slots, and backward-to-forward beam scanning characteristics at 76 GHz have been demonstrated in the measurement. The scanning angle as wide as from 73 to 114 deg has been achieved experimentally. The aperture efficiency is 25.3%.
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