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A novel ridged SIW leaky wave antenna (LWA) with controllable side lobe leveland low cross-polarization is proposed and fabricated. Longitudinallycontinuous asymmetric ridges beside SIW sidewalls provide an asymmetric fielddistribution around the long slot centered on the upper plane of the structure,in way that the slot can radiate. An accurate transverse equivalent networkanalysis is presented for calculating the properties of the proposed LWA. Thewavenumbers of the leaky-mode are calculated theoretically and numerically. Thedesigned ridged SIW LWA shows a good SLL and cross polarization. Measurementresults are also consistent with the simulation results.

Long Slot Ridged SIW Leaky Wave Antenna Design Using Transverse Equivalent Technique