This paper proposes a technique to enhance the bandwidth and gain of an endfire radiating\nopen-ended waveguide using a thin slow-wave surface plasmon structure. Mounted in the E-plane\nof the stated waveguide, a thin corrugated slow-wave structure has been used in conjunction with a\nwaveguide transition to generate an endfire electromagnetic beam. An efficient mode conversion\nfrom waveguide transition to the corrugate plate resulted in the improved performance of the design.\nAn impedance bandwidth from 8 GHz to 18 GHz has been achieved along with a gain enhancement\nfrom 7 dBi to 14.8 dBi using the proposed hybrid design. Endfire radiations have been obtained\nwith a beam width of less than 25 Degree through the proposed hybrid design with an efficiency of about\n96 percent.
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