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Simple Design Procedure for 2D SWAs with Specified Sidelobe and Inclined Coupling Slots

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... To achieve the directive pattern features, planar SWAs can be formed by stacking a specified number of radiating SWAs, fed by an additional SWA. Inclined coupling slots 19,20 are used in the conventional planar SWA systems to couple the power from the feeder SWA to the stacked radiating SWAs. The rotation angles of these coupling slots from the waveguide centerline are either considered to be uniform or nonuniform. ...
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This article presents a complete design procedure for planar slotted waveguide antennas (SWA). For a desired sidelobe level ratio (SLR), the proposed method provides a pencil shape pattern with a narrow half power beamwidth, which makes the proposed system suitable for high power microwave applications. The proposed planar SWA is composed of only two layers, and uses longitudinal coupling slots rather than the conventional inclined coupling slots. For a desired SLR, the slots excitation in the radiating and feeder SWAs are calculated based on a specified distribution. Simplified closed-form equations are then used to determine the slots nonuniform displacements, for both the radiating and feeder SWAs, without the need to use optimization algorithms. Using simplified equations, the slots lengths, widths, and their distribution along the length of the radiating and feeder SWAs can be found. The feeder dimensions and slots positions are deduced from the dimensions and total number of the radiating SWAs. An 8 × 8 planar SWA has been designed and tested to show the validity of the proposed method. The obtained measured and simulated results are in accordance with the design objectives.
... To achieve the directive pattern features, planar SWAs can be formed by stacking a specified number of radiating SWAs, fed by an additional SWA. Inclined coupling slots 19,20 are used in the conventional planar SWA systems to couple the power from the feeder SWA to the stacked radiating SWAs. The rotation angles of these coupling slots from the waveguide centerline are either considered to be uniform or nonuniform. ...
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