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Surface-Wave Launchers for Beam Steering and Application to Planar Leaky-Wave Antennas

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3 Author(s)
Podilchak, S.K. ; Electr. Eng. Depts., R. Mil. Coll. of Canada (RMC), Kingston, ON ; Freundorfer, A.P. ; Antar, Y.M.M.

A linear array of surface-wave launchers (SWLs) is presented for surface-wave (SW) beam steering on a grounded dielectric slab (GDS). Specifically, a two-element array of directive Yagi-Uda like SWL antennas (operating between 21-24 GHz) is investigated. By varying the relative phase difference between SWL elements, the excited SW field distribution can be steered. In addition, a six-element linear array of SWLs with nonuniform weighting is also presented. If metallic gratings are placed on top of the GDS, the bound SW mode can be transformed into a radiated leaky-wave (LW) mode and directive beam patterns can be generated in the far field. A specific elliptical grating configuration is also investigated demonstrating single frequency cylindrical-sector LW beam steering. These slotted SWL arrays can be useful for novel SW beam scanning designs, millimeter wave power distribution systems and new LW antennas.

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Antennas and Propagation, IEEE Transactions on  (Volume:57 ,  Issue: 2 )