Different types of waveguide leaky-wave antennas,asymmetrically perturbed with printed-circuits, are studied inthis paper. The capability to modify the leakage constant of theexcited leaky-wave mode, while maintaining unchanged its phaseconstant, is studied in detail for each design. Several slot and stripconfigurations are proposed, in which the width and the positionof the planar printed circuit perturbation is modified along thelength of the antenna to obtain different tapering topologies. Allof them are mechanically flexible to realize, thus simplifying themanufacturing process for millimeter wavelengths applications.The two-dimensional method used for the analysis is accuratefor any geometry of the planar perturbation, and also allows forthe computation of the whole spectrum of modes in these openwaveguides. This makes possible to predict the appearance ofunwanted channel-guide modes, and also allows for the studyof the coupling effect between the desired leaky-wave mode andthem. A tapered design is performed and compared with full-wavethree-dimension simulations to validate the proposed technology.
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