Novel Continuous Beam Scanning Leaky-Wave Antennas Using 1-D Mushroom Structure

Novel continuous backward-to-forward beam scanning leaky-wave antennas (LWAs) are designed using a I-I) mushroom structure. An effective method is proposed to suppress the handgap of a mushroom structure. A smooth transition between the backward and forward leaky modes is achievable by choosing a suitable value of the via inductance, and hence the antenna has design flexibility. The study starts from an equivalent circuit of a unit cell and is verified through simulation and measurement. The measured results confirm a continuous 126 beam scan, starting from 60, with less than 3 dB gain variation. Moreover, the measured 3dB gain bandwidth is over 58%, which is better than most of the reported l.WAs.